GOST 18300-87
INTERSTATE STANDARD
Ethanol
RECTIFIED TECHNICAL
TECHNICAL CONDITIONS
Official publication
Standardinform
UDC 661.722:006.354
INTERSTATE
Group L25
STANDARD
RECTIFIED TECHNICAL ETHYL ALCOHOL
Specifications
Technical rectified ethyl alcohol. Specifications
MKS 71.080.60 OKP 91 8213 2000
Date of introduction 07/01/88
This standard applies to technical ethyl rectified alcohol produced from non-edible plant materials. The “Extra” brand product is intended for use as a solvent and for other purposes. Technical ethyl rectified alcohol of the highest and first grades is used as a raw material for the production of chemical products.
The technical level indicators established by this standard for the “Extra” and premium grades are provided for the highest quality category.
1. TECHNICAL REQUIREMENTS
1.1. Technical ethyl rectified alcohol must be manufactured in accordance with the requirements of this standard according to technological regulations approved in the prescribed manner.
1.2. Characteristics
1.2.1. Depending on the degree of purification, rectified technical ethyl alcohol is produced in the “Extra” grade and in two grades: premium and first.
1.2.2. In terms of physical and chemical indicators, technical ethyl rectified alcohol must meet the requirements and values specified in the table.
Official publication ★
Reproduction is prohibited
Publishing house of standards, 1987 D STANDARDINFORM, 2007 D STANDARDINFORM, 2008
Continuation
|
Meaning | ||||
|
Indicator name |
Method of analysis |
|||
|
brand "Extra" OKP 91 8213 2100 |
highest grade OKP 91 8213 2200 |
first grade OKP 91 8213 2300 | ||
|
4. Test for purity |
Must stand the test |
According to GOST 5964* |
||
|
5. Test for oxidation - capacity, min, not less |
According to GOST 5964* |
|||
|
6. Mass concentration of aldehydes in anhydrous alcohol, mg/dm * 1 2 3, no more |
According to GOST 5964*, section. 2, and by and. 3.2 of this standard |
|||
|
7. Mass concentration of fusel oil in anhydrous alcohol, mg/dm 3, no more |
According to GOST 5964*, section. 2, and by and. 3.3 of this standard |
|||
|
8. Mass concentration of acids in terms of acetic acid in anhydrous alcohol, mg/dm 3, no more |
According to GOST 5964* |
|||
|
9. Mass concentration of esters in anhydrous alcohol, mg/dm 3, no more |
According to GOST 5964*, section. 2 |
|||
|
10. Test for methyl alcohol |
Must stand the test |
According to GOST 5964*, section. 2. and according to clause 3.4 of this standard |
||
|
11. Test for furfural |
Absent |
According to GOST 5964* |
||
|
12. Mass concentration of dry residue, mg/dm 3, no more |
According to GOST 10749.9 and according to i. 3.5 of this standard |
|||
|
13. Mass concentration of sulfur, mg/dm 3, no more |
Absent |
According to GOST 10749.7 |
||
|
14. Mass concentration of alkali in terms of NaOH, mg/dm 3, no more |
Absent |
According to GOST 10749.4 |
||
|
15. Specific volumetric electrical resistance, Ohm ■ cm, not less |
Not defined | |||
* On the territory of the Russian Federation, GOST R 51710-2000, GOST R 52473-2005 (hereinafter) are in force.
Notes:
1. Only “Extra” grade alcohol is intended for the electronics industry.
2. The mass concentration of sulfur is determined only in the alcohol obtained during the processing of the mixture
rolyse and sulfite alcohols.
1.2.3. Ethyl alcohol, according to the degree of impact on the human body, belongs to class 4
danger according to GOST 12.1.007.
The maximum permissible concentration (MPC) of ethyl alcohol vapor in the air of the working area of industrial premises is 1000 mg/m 3 .
1.2.4. Ethyl alcohol is a colorless, flammable liquid. Flash point - not less than 13 °C, auto-ignition temperature - not less than 404 °C, concentrated flame spread limits: lower - 3.6%, upper - 19% (by volume). Temperature limits for flame propagation of saturated alcohol vapor in the air: lower - 11 °C, upper - 41 °C. Category and group of explosive mixture of ethyl alcohol with air - IIA-T2. The determination is carried out according to GOST 12.1.044.
1.2.5. Tanks, process equipment, pipelines and draining and loading devices associated with the reception, storage and movement of ethyl alcohol must be protected from static electricity in accordance with the rules for protection against static electricity, approved in the prescribed manner.
Electrical equipment must be explosion-proof.
1.2.6. In emergency conditions with an increased concentration of ethyl alcohol in the air, as well as in case of fire, you should use personal respiratory protection equipment - filtering gas masks of grade A or BKF.
1.2.7. Fire extinguishing agents: sprayed water, sand, asbestos blanket, all types of fire extinguishers.
1.2.8. When working with ethyl alcohol, you should wear special clothing in accordance with industry standards.
1.3. Marking
1.3.1. Transport marking - according to GOST 14192.
1.3.2. The following additional data is applied to each barrel of product: name of the manufacturer and its trademark; name and brand or grade of product;
batch number, number of seats in the batch and their numbers; date of manufacture;
danger signs according to GOST 19433, group code 3252; the inscription “Flammable”; amount of alcohol in deciliters; designation of this standard.
Railroad tanks must be marked with warning signs “Flammable” and “Poisonous”, as well as a stencil.
1.4. Package
1.4.1. Technical ethyl rectified alcohol is poured into specially prepared railway and road tanks. It is allowed to pack alcohol in hermetically sealed barrels in accordance with GOST 13950 and GOST 6247, bottles in accordance with OST 6-09-108 or metal flasks in accordance with GOST 5037, FL version.
Bottles with alcohol must be placed in board crates in accordance with GOST 12082, board boxes in accordance with GOST 2991 or similar types, filled with loose cushioning material.
1.4.2. The degree (level) of filling of tanks and barrels is calculated taking into account the full use of their capacity (carrying capacity) and volumetric expansion of the product with a possible temperature difference along the route.
2. ACCEPTANCE
2.1. Technical rectified ethyl alcohol is taken in batches. A batch is considered to be any quantity of alcohol, homogeneous in terms of quality, one shipment date and accompanied by one quality document.
The document must contain:
name of the manufacturer and its trademark; name and brand or grade of product; party number, number of seats in the party; amount of alcohol in deciliters or gross and net mass; date of manufacture;
results of analyzes or confirmation of product quality compliance with the requirements of this standard;
quality document number;
designation of this standard;
"Flammable" sign.
When transporting alcohol in railway and road tanks, each tank is considered a batch.
2.2. To check the quality of ethyl alcohol for compliance with the requirements of this standard, an alcohol sample is taken from each tank or dispensing measure. The manufacturer is allowed to take a sample from a commercial storage tank, and when determining the volume fraction of ethyl alcohol, a sample is taken from each railway tank.
From a batch of alcohol in barrels, bottles or cans, 10% of the units of production are selected, but not less than three.
The manufacturer determines the specific volumetric electrical resistance periodically at the request of consumers.
2.3. If unsatisfactory analysis results are obtained for at least one of the indicators, a repeat analysis is carried out on a double sample taken from the same batch, or on a double number of samples from the tank. The results of the re-analysis apply to the entire batch.
3. METHODS OF ANALYSIS
3.1. Sampling methods
3.1.1. A point sample from a tank or storage tank is taken with a portable metal sampler in accordance with GOST 2517 in equal parts from three levels: top, middle and bottom.
It is permissible to use a sampler of a different design.
A point sample is taken from the dispensing measuring cup using sampling taps. In the absence of taps, the sample is taken in the same way as from a tank. A sample is taken from barrels, bottles and cans with a clean glass tube, immersing it to the bottom.
The volume of a spot sample is at least 200 cm3.
3.1.2. Selected spot samples are combined together, thoroughly mixed, and the combined sample in a volume of at least 2 dm 3 is placed in two clean bottles with ground stoppers, previously rinsed with the same alcohol, with a capacity of 1 dm 3. The necks of the bottles are wrapped in a piece of fabric or cellophane and tied with twine, the ends of which are sealed or sealed with a wax seal on a cardboard or wooden plate. Labels with the name of the manufacturer, the name of the product, the batch number, the date and place of sampling, the designation of the standard, and the name of the sampler are affixed to the bottles with the combined sample.
One of the bottles is sent for analysis to the laboratory, the other is stored for two months in case of disagreement in assessing the quality of the product.
3.2. Determination of mass concentration of aldehydes in anhydrous alcohol
In this case, a standard alcohol solution is used with a mass concentration of acetaldehyde of 4 mg in 1 dm 3 of anhydrous alcohol for the “Extra” and premium grade, 10 mg in 1 dm 3 of anhydrous alcohol for the first grade.
3.3. Determination of the mass concentration of fusel oil in anhydrous alcohol
The determination is carried out according to GOST 5964, section. 2.
In this case, standard alcohol solutions of a mixture of higher alcohols are used: 4 mg of acetaldehyde and 4 mg of fusel oil in 1 dm 3 of anhydrous alcohol for the “Extra” and premium grade, 10 mg of acetaldehyde and 15 mg of fusel oil in 1 dm 3 of anhydrous alcohol - for the first grade.
3.4. Test for methyl alcohol
The determination is carried out according to GOST 5964, section. 2.
In this case, a standard alcohol solution with a volume fraction of methyl alcohol of 0.05% is used.
Technical rectified ethyl alcohol meets the requirements of this standard if the color of the analyzed solution is weaker than the color of the standard alcohol solution or the same as it.
3.5. Determination of mass concentration of dry residue
Determination is carried out according to GOST 10749.9
In this case, it is allowed to use quartz evaporation bowls in accordance with GOST 19908 or platinum bowls in accordance with GOST 6563.
3.6. Determination of specific volumetric electrical resistance
3.6.1. Equipment, reagents and solutions
Conductivity meter type MMZCH-04 or similar type.
Thermostat.
A set of sensors for conductometric measurements, type UK-02/1 (two-electrode sensor with a smooth platinum surface and a constant of no more than 0.5 cm -1).
Distilled water according to GOST 6709 with a specific electrical conductivity of no more than 2 10 6 Ohm -1 cm -1 or equivalent purity with the same electrical conductivity.
Potassium chloride according to GOST 4234, twice recrystallized, concentration c (KS1) = 0.001 mol/dm 3 (0.001 n.).
3.6.2. Determination of the sensor constant
A solution of potassium chloride is poured into the measuring vessel so that the electrodes are completely covered with it, thermostated at a temperature of (20 + 0.1) °C for at least 15 minutes and the resistance of this solution is measured.
3.6.3. Processing the results
The sensor constant (K), cm -1, is calculated using the formula
where a is the specific electrical conductivity of a 0.001 mol/dm 3 solution of potassium chloride, equal to 0.000128 Ohm -1 cm -1 at 20 °C, Ohm -1 cm -1 ;
R is the resistance of the potassium chloride solution, Ohm.
3.6.4. Carrying out analysis
The sensors and measuring vessel are thoroughly washed with distilled water and the alcohol being analyzed, then filled with the same alcohol.
Measurement of specific volumetric electrical resistance is carried out as indicated in i. 3.6.2.
3.6.5. Processing the results
Specific volumetric electrical resistance (p v), Ohm cm, is calculated using the formula
where R is the resistance of the alcohol being analyzed, Ohm;
K is the sensor constant, cm -1.
The result of the analysis is taken as the arithmetic mean of the results of two parallel determinations, the relative value of the discrepancy between them does not exceed the value of the permissible discrepancy equal to 5%.
The limits of the permissible relative total error of the analysis result are + 3% with a confidence probability of P = 0.95.
4. TRANSPORTATION AND STORAGE
4.1. Transportation of ethyl alcohol by rail is carried out in accordance with the rules for the transportation of dangerous goods and liquid cargo in bulk in tank cars and bunker gondola cars.
Transportation of ethyl alcohol in barrels, bottles and flasks by road and in bulk in tank trucks is carried out in accordance with the rules for the transportation of goods in force for this type of transport.
4.2. Technical rectified ethyl alcohol is stored in warehouses in specially equipped metal containers intended for it in accordance with the rules for acceptance, storage, dispensing, transportation and accounting of ethyl alcohol, approved in the prescribed manner.
It is allowed to store technical rectified ethyl alcohol in warehouses intended for storing flammable products, in the manufacturer's packaging.
INFORMATION DATA
1. DEVELOPED AND INTRODUCED by the Ministry of Medical and Microbiological Industry of the USSR
2. APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee on Standards dated June 26, 1987 No. 2705
3. INSTEAD GOST 18300-72
4. REFERENCE REGULATIVE AND TECHNICAL DOCUMENTS
|
Number of paragraph, subparagraph |
|
|
GOST 12.1.007-76 | |
|
GOST 12.1.044-89 | |
|
GOST 2517-85 | |
|
GOST 2991-85 | |
|
GOST 3639-79 | |
|
GOST 4234-77 | |
|
GOST 5037-97 | |
|
GOST 5964-93 |
1.2.2, 3.2, 3.3, 3.4 |
|
GOST 6247-79 | |
|
GOST 6563-75 | |
|
GOST 6709-72 | |
|
GOST 10749.4-80 | |
|
GOST 10749.7-80 | |
|
GOST 10749.9-80 | |
|
GOST 12082-82 | |
|
GOST 13950-91 | |
|
GOST 14192-96 | |
|
GOST 19433-88 | |
|
GOST 19908-90 | |
|
OST 6-09-108-85 |
5. The validity period was lifted according to Protocol No. 7-95 of the Interstate Council for Standardization, Metrology and Certification (IUS 11-95)
6. REPUBLICATION. January 2007
Reprint (as of April 2008)
Editor R.G. Goverdovskaya Technical editor V.N. Prusakova Corrector M.V. Buchnaya Computer layout A.N. Zolotareva
Signed for publication on June 10, 2008. Format bОхвД 1 /^ Offset paper. Times typeface. Offset printing. Uel. oven l. 0.93. Academic ed. l. 0.72. Circulation 94 copies. Zach. 706.
FSUE "STANDARTINFORM", 123995 Moscow, Granatny per., 4. Typed into FSUE "STANDARTINFORM" on a PC
Printed in the branch of FSUE "STANDARTINFORM" - type. "Moscow Printer", 105062 Moscow, Lyalin lane, 6.
Price 3 kopecks.
GOST 18300-72
Official publication
USSR STATE COMMITTEE ON STANDARDS
UDC 663.52: 006.354 Group* L25
STATE STANDARD OF THE USSR UNION
RECTIFIED TECHNICAL ETHYL ALCOHOL
Ethyl alcohol rectified technical
By Decree of the State Committee of Standards of the Council of Ministers of the USSR dated December 26, 1972 No. 2329, the introduction date was established
from 01.07. 1973
Verified in 1977. Validity period extended until 07/01. 1983
Failure to comply with the standard is punishable by law
This standard applies to technical ethyl rectified alcohol produced from non-edible plant materials.
1. TECHNICAL REQUIREMENTS
1.1. Depending on the degree of purification, rectified technical ethyl alcohol is produced in three grades: highest, 1st and 2nd.
1.2. In terms of physical and chemical indicators, technical ethyl alcohol must comply with the requirements and standards specified in the table.
1. Appearance
4. Test for purity
Transparent, colorless liquid without mechanical impurities. Characteristic of rectified ethyl alcohol, without the odor of foreign substances.
Must stand the test
Official publication Reproduction prohibited
Reprint (December 1979) with revision No./ published March 1974
© Standards Publishing House, 1980
(Continuation of changes to GOST J8300-72)
(Continued on page 146)
(Continuation of changes to GOST 18300-72)
Continuation
The column “state quality mark” should be amended in a new edition: “highest category of quality”; The column “highest quality category” should be supplemented with the following grade: “Extra”;
the note should be stated in a new edition: “Note. Alcohol corresponding to the characteristics of the “Extra” grade is intended for the electronics industry.
Clauses 2.1, 2.2 shall be stated in a new edition: “2.1. Technical rectified ethyl alcohol is taken in batches. A batch is considered to be any quantity of alcohol that is uniform in terms of quality and accompanied by one quality document.
The document must contain:
name of the manufacturer and its trademark; name and type of product;
batch number, number of seats in the batch and their numbers; amount of alcohol in dal or gross and net weight; date of manufacture of the product; the inscription “Flammable”; results of the analyzes performed; designation of this standard.
When transporting alcohol in railway and road tanks, each tank is considered a batch.
2.2. To check the quality of technical rectified ethyl alcohol for compliance of its indicators with the requirements of this standard, a sample of alcohol is taken from each tank or dispensing measure.
When transporting alcohol in barrels, bottles or cans, 10% of the units of production are selected, but not less than three.”
The standard should be supplemented with clause 2.2a: “2.2a. The mass concentration of sulfur is determined only in alcohol obtained by processing a mixture of hydrolytic and sulfite alcohols.
Specific volumetric electrical resistance is determined at the request of consumers.”
Clause 2.3. Delete the words: “are final and”.
Clause 3.1. Replace the word: “One-time” with “Spot”.
Clause 3.2. First paragraph. Replace the words and meanings: “single” with “point”, “average” with “combined”, “quantity” with “volume”, 1 l per 2 dm 3, 0.5 l per 1 dm 3;
the second paragraph should be stated in a new edition: “Labels with the following designations are affixed to the bottles with the combined sample: the name of the manufacturer;
(Continued on page 147)
(Continuation of changes to GOST 18300-72)
product name, batch number, sampling date. One of the bottles is sent for analysis to the laboratory, the second is stored for two months in case of disagreement in quality assessment.”
Clause 3.3 should be deleted.
The standard should be supplemented with paragraphs - 3.3a - Z.Zg:
“3.3a. Determination of mass concentration of aldehydes*
In this case, a standard alcohol solution is used with a mass concentration of acetaldehyde of 4 mg in 1 dm 3 of anhydrous alcohol for the “Extra”, highest and 1st grades; 10 mg in 1 dm3 of anhydrous alcohol - for the 2nd grade.
3.36. Determination of mass concentration of fusel* oil
The determination is carried out according to GOST 5964-82, section. 2.
In this case, standard alcohol solutions of a mixture of higher alcohols* are used corresponding to the content: 4 mg of acetaldehyde and 4 mg of fusel oil in 1 dm3 of anhydrous alcohol - for the “Extra”, higher and 1st grades and 10 mg of acetaldehyde and 15 mg of fusel oil in 1 dm 3 anhydrous alcohol - for the 2nd grade.
Z.Zv. Test for methyl alcohol
The determination is carried out according to GOST 5964-82.
In this case, a standard alcohol solution with a volume fraction of methyl alcohol of 0.05% is used.
Technical rectified ethyl alcohol meets the requirements of this standard if the color of the analyzed solution is weaker or the same as the color of a standard alcohol solution.
Z.Zg. Determination of mass concentration of dry o s-
In this case, the use of quartz evaporation bowls in accordance with GOST 19908-80 is allowed.”
Clause 3.4.1. The second paragraph should be supplemented with the words: “or another similar* type with the same limits of electrical resistance.”
Clause 4.1. Replace the words and references: “or tank trucks” with “and tank trucks”, “A small amount of alcohol” with “Alcohol”, GOST 6247-72 with GOST 6247-79, GOST 5105-66 with GOST 5105-76; add the paragraph: “Containers intended for transportation and storage of alcohol must be clean and prepared in accordance with the current instructions for acceptance, storage* dispensing, transportation and accounting of ethyl alcohol.”
Clause 4.3 shall be stated in a new wording: “4.3. Transport marking - by -
(Continued on page 148)
GOST 18300-87
INTERSTATE STANDARD
RECTIFIED TECHNICAL ETHYL ALCOHOL
TECHNICAL CONDITIONS
Official publication
UDC 661.722:006.354 Group L25
INTERSTATE STANDARD
RECTIFIED TECHNICAL ETHYL ALCOHOL
Specifications 18300_87
Technical rectified ethyl alcohol. Specifications
MKS 71.080.60 OKP 91 S2I3 2000
Date of introduction 07/01/88
This standard applies to technical ethyl rectified alcohol produced from non-edible plant materials. The “Extra” brand product is intended for use as a solvent and for other purposes. Technical ethyl rectified alcohol of the highest and first grades is used as a raw material for the production of chemical products.
The technical level indicators established by this standard for the “Extra 1 and premium grade” brands are provided for the highest quality category.
1. TECHNICAL REQUIREMENTS
1.1. Technical ethyl rectified alcohol must be manufactured in accordance with the requirements of this standard according to technological regulations approved in the prescribed manner.
1.2. Characteristics
1.2.1. Depending on the degree of purification, rectified technical ethyl alcohol is produced in “Extra*” grades and in two grades: premium and first.
1.2.2. In terms of physical and chemical indicators, technical ethyl rectified alcohol must meet the requirements and values specified in the table.
| Official publication Reproduction prohibited |
© Standards Publishing House, 1987 © STANDARDINFORM, 2007 © STANDARDINFORM. 2008
S. 2 GOST 18300-87
| Continuation |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
* GOST R 51710-2000 is in force on the territory of the Russian Federation. GOST R 52473-2005 (hereinafter).
Notes:
1. Only “Extra” grade alcohol is intended for the electronics industry.
2. The mass concentration of sulfur is determined only in alcohol obtained by processing a mixture of hydrolytic and sulfite alcohols.
1.2.3. Ethyl alcohol, in terms of the degree of impact on the human body, belongs to the 4th hazard class according to GOST 12.1.007.
GOST 18300-87 S. 3
The maximum permissible concentration (MPC) of ethyl alcohol vapor in the air of the working area of industrial premises is 1000 mg/m 3 .
1.2.4. Ethyl alcohol is a colorless, flammable liquid. Flash point - not less than 13 * C, auto-ignition temperature - not less than 404 * C, concentrated flame spread limits: lower - 3.6%. upper - 19% (by volume). Temperature limits for flame propagation of saturated alcohol vapor in the air: lower - 11 *C, upper - 41 'C. Category and group of explosive mixture of ethyl alcohol with air - IIA-T2. The determination is carried out according to GOST 12.1.044.
1.2.5. Tanks, process equipment, pipelines and oil-filling devices associated with the reception, storage and movement of ethyl alcohol must be protected from static electricity in accordance with the rules for protection against static electricity, approved in the prescribed manner.
Electrical equipment must be explosion-proof.
1.2.6. In emergency conditions with an increased concentration of ethyl alcohol in the air, as well as in case of fire, personal respiratory protection should be used - filtering gas masks of grade A or BKF.
1.2.7. Fire extinguishing agents: sprayed water, sand, asbestos blanket, all types of fire extinguishers.
1.2.8. When working with ethyl alcohol, you should wear special clothing in accordance with industry standards.
1.3. Marking
1.3.1. Transport marking - according to GOST 14192.
1.3.2. The following additional data is applied to each barrel of product: name of the manufacturer and its trademark: name and brand or grade of the product;
batch number, number of seats in the batch and their numbers; date>" of manufacture:
danger signs according to GOST 19433, group code 3252; the inscription “Flammable”; quantity of alcohol in deciliters: designation of this standard.
Railroad tanks must be marked with warning signs “Flammable*, “Poisonous”, as well as a registration stencil.
1.4. Package
1.4.1. Technical ethyl rectified alcohol is poured into specially prepared railway and road tanks. It is allowed to pack alcohol in hermetically sealed barrels in accordance with GOST 13950 and GOST 6247. bottles according to OST 6-09-108 or metal flasks according to GOST 5037, version FL.
Bottles with alcohol must be placed in board crates in accordance with GOST 120N2, board boxes in accordance with GOST 2991 or similar types, filled with loose cushioning material.
1.4.2. The degree (level) of filling of tanks and barrels is calculated taking into account the full use of their capacity (carrying capacity) and volumetric expansion of the product with a possible temperature difference along the route.
2. ACCEPTANCE
2.1. Technical rectified ethyl alcohol is taken in batches. A batch is considered to be any quantity of alcohol, homogeneous in terms of quality, one shipment date and accompanied by one quality document.
The document must contain:
name of the manufacturer and its trademark; name and brand or grade of product: batch number, number of places in the batch; amount of alcohol in deciliters or gross and net weight: date of manufacture;
S. 4 GOST 18300-87
results of analyzes or confirmation of product quality compliance with the requirements of this standard;
quality document number;
designation of this standard;
"Flammable" sign.
When transporting alcohol in railway and road tanks, each tank is considered a batch.
2.2. To check the quality of ethyl alcohol for compliance with the requirements of this standard, an alcohol sample is taken from each tank or dispensing measure. The manufacturer is allowed to take a sample from a commercial storage tank, and when determining the volume fraction of ethyl alcohol, a sample is taken from each railway tank.
From a batch of alcohol in barrels, bottles or cans, 10% of the units of production are selected, but not less than three.
The manufacturer determines the specific volumetric electrical resistance periodically at the request of consumers.
2.3. If unsatisfactory analysis results are obtained for at least one of the indicators, a repeat analysis is carried out on a double sample taken from the same batch, or on a double number of samples from the tank. The results of the re-analysis apply to the entire batch.
3. METHODS OF ANALYSIS
3.1. Sampling methods
3.1.1. A point sample from a tank or storage tank is taken with a portable metal sampler in accordance with GOST 2517 in equal parts from three levels: top, middle and bottom.
It is permissible to use a sampler of a different design.
A point sample is taken from the dispensing measuring cup using sampling taps. In the absence of taps, the sample is taken in the same way as from a tank. A sample is taken from barrels, bottles and cans with a clean glass tube, immersing it to the bottom.
The volume of a spot sample is at least 200 cm3.
3.1.2. Selected spot samples are combined together, thoroughly mixed, and the combined sample in a volume of at least 2 dm 3 is placed in two clean bottles with ground stoppers, previously rinsed with the same alcohol, with a capacity of 1 dm 3. The necks of the bottles are wrapped in a piece of fabric or cellophane and tied with twine, the ends of which are sealed or sealed with a wax seal on a cardboard or wooden plate. Labels with the name of the manufacturer, the name of the product, the batch number, the date and place of sampling, the designation of the standard, and the name of the sampler are affixed to the bottles with the combined sample.
One of the bottles is sent for analysis to the laboratory, the other is stored for two months in case of disagreement in assessing the quality of the product.
3.2. Determination of mass concentration of aldehydes in anhydrous alcohol
In this case, a standard alcohol solution is used with a mass concentration of acetaldehyde of 4 mg in 1 dm 3 of anhydrous alcohol for the “Extra* and premium grade” brand, 10 mg in 1 dm 3 of anhydrous alcohol for the first grade.
3.3. Determination of the mass concentration of fusel oil in anhydrous alcohol
The determination is carried out according to GOSH 5964. section. 2.
In this case, standard alcohol solutions of a mixture of higher alcohols are used: 4 mg of acetaldehyde and 4 mg of fusel oil in 1 dm 3 of anhydrous alcohol for the “Extra” and premium grade, 10 mg of acetaldehyde and 15 mg of fusel oil in 1 dm 3 of anhydrous alcohol - for the first grade.
3.4. Test for methyl alcohol
The determination is carried out according to GOST 5964, section. 2.
GOST 18300-87 S. 5
In this case, a standard alcohol solution with a volume fraction of methyl alcohol of 0.05% is used. Technical rectified ethyl alcohol meets the requirements of this standard if the color of the analyzed solution is weaker than the color of the standard alcohol solution or the same as it.
3.5. Determination of mass concentration of dry residue Determination is carried out according to GOST 10749.9
In this case, it is allowed to use quartz evaporation bowls in accordance with GOST 19908 or platinum bowls in accordance with GOST 6563.
3.6. Determination of specific volumetric electrical resistance
3.6.1. Equipment, reagents and solutions Conductivity meter type MM34-04 or similar type.
Thermostat.
A set of sensors for conductivity measurements, type UK-02/1 (two-electrode sensor with a smooth platinum surface and a constant of no more than 0.5 cm -1).
Distilled water according to GOST 6709 with a specific electrical conductivity of no more than 2 10 6 Ohm -1 cm -1 or equivalent purity with the same electrical conductivity.
Potassium chloride according to GOST 4234, twice recrystallized. concentration c(KCI) = 0.001 mol/dm 3 (0.001 k.).
3.6.2. Determination of the sensor constant
The potassium chloride solution is poured into the measuring vessel as follows. so that the electrodes are completely covered with it, thermostate at a temperature of (20 1 0.1) "C for at least 15 minutes and measure the resistance of this solution.
3.6.3. Processing /ng results
The sensor constant (K), cm -1, is calculated using the formula
where a is the specific electrical conductivity of a 0.001 mol/dm 3 solution of potassium chloride, equal to 0.000128 Ohm-" cm-' at 20 *C, Ohm~> cm~";
R is the resistance of the potassium chloride solution. Ohm.
3.6.4. Carrying out ananpa
The sensors and measuring vessel are thoroughly washed with distilled water and the alcohol being analyzed, then filled with heme alcohol.
Measurement of specific volumetric electrical resistance is carried out as indicated in paragraph 3.6.2.
3.6.5. Processing the results
Specific volumetric electrical resistance (p,), Ohm cm, is calculated using the formula
where R is the resistance of the alcohol being analyzed. Ohm;
K is the sensor constant, cm -1.
The result of the analysis is taken as the arithmetic mean of the results of two parallel determinations, the relative value of the discrepancy between them does not exceed the value of the permissible discrepancy equal to 5%.
The limits of the permissible relative total error of the analysis result are ± 3% with a confidence probability of P = 0.95.
4. TRANSPORTATION AND STORAGE
4.1. Transportation of ethyl alcohol by rail is carried out in accordance with the rules for the transportation of dangerous goods and liquid cargo in bulk in tank cars and bunker gondola cars.
Transportation of ethyl alcohol in barrels, bottles and flasks by road and in bulk in tank trucks is carried out in accordance with the rules for the carriage of goods in force for this type of transport.
S. 6 GOST 18300-87
4.2. Technical rectified ethyl alcohol is stored in warehouses in specially equipped metal containers intended for it and in accordance with the acceptance rules. storage, dispensing, transportation and accounting of ethyl alcohol, approved in accordance with the established procedure.
It is allowed to store technical rectified ethyl alcohol in warehouses intended for storing flammable products, in the manufacturer's packaging.
OST 6-09-108-85
5. The validity period was lifted according to Protocol No. 7-95 of the Interstate Council for Standardization, Metrology and Certification (IUS 11-95)
6. REPUBLICATION. January 2007
Reprint (as of April 2008)
Editor R.G. Goverdovskaya Technical editor v.II. Prusakova Proofreader A/.V. Heap Kompyheria sun pci ka L.N. Zolotareva
Signed for publication on June 10, 2008. Format 60x84"/k - Offset paper. Times typeface. Printed offset.
Uel. nsch. l. 0.93. Academic ed. l. 0.72. Circulation 94 copies. Zach. 706.
FSUE "STANDARTINFORM.. 123995 Moscow. Granatny Lane.. 4. www.goMinfo.tu inra№gostinro.ru
Typed in FSUE.STANDARTINFORM- on a PC Printed in the branch of FSUE STANDARDINFORM- - 1ip. ‘Moscow printer.. I0S062 Moscow. Lyalin lane.. 6.
