GB/T 6820-2016Ethanol for industrial use (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard replaces GB/T 6820-1992 "Industrial synthesis of ethanol". As compared with GB/T 6820-1992, the main technical changes are as follows.

- MODIFY the standard name to "Ethanol for industrial use";

- MODIFY the scope of application (see Chapter 1; Chapter 1 of the 1992 edition);

- ADD the 99.5% ethanol type (see Chapter 3);

- The index of 95.0% ethanol type is divided into three grades. superior, first-grade, qualified products. ADD four items. isopropyl alcohol, n-propanol, acetate, sulfuric acid test chroma. MODIFY the original fusel oil item into a C4 + C5 alcohol item. MODIFY the first-class chromaticity product from No.10 to No.5.MODIFY the volume fraction of the ethanol content of first-class product from 96.0% to 95.0%. MODIFY the acid content of the superior product from 0.0020% to 10 mg/L; MODIFY the acid content of the first-class product from 0.0025% to 20 mg/L. For the aldehyde content.

MODIFY it from 0.0020% to 10 mg/L for superior product and from 0.0040% to 15 mg/L for the first-class product. For the methanol content. MODIFY it from 0.02% to 100 mg/L for superior product and from 0.03% to 150 mg/L for the first-class product. For the oxidation time of potassium permanganate. MODIFY it from 20 min to 25 min for superior product and from 15 min to 20 min for the first-class product. For the evaporative residue.

MODIFY it from 0.0025% to 20 mg/L for superior product and from 0.0030% to 25 mg/L for the first-class product (see Table 1; Table 1 of the 1992 edition);

- ADD the gas chromatography test methods for methanol and C4 + C5 alcohol item (see 5.8);

- ADD the type inspection items. evaporative residues, sulfuric acid test chroma, water miscibility tests were determined as type inspection items (see 6.1).

1 Scope

This standard specifies the product classification, requirements, test methods, inspection rules and signs, packaging, storage, transportation and safety of ethanol for industrial use.

This standard applies to ethanol for industrial use. Molecular formula. C2H5OH Structural formula.

Relative molecular mass. 46.07 (according to international relative atomic mass in 2011)

2 Normative references

The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this standard.

GB 190 Packing symbol of dangerous goods

GB/T 191 Packaging - Pictorial marking for handling of goods

GB/T 394.2-2008 General methods of analysis for ethanol

GB/T 601 Chemical reagent - Preparations of standard volumetric solutions

GB/T 602 Chemical reagent - preparations of standard solutions for impurity

GB/T 603 Chemical reagent - Preparations of reagent solution for use in test

GB/T 3723 Sampling of chemical products for industrial use - Safety in sampling

GB/T 6283 Chemical products - Determination of water Karl Fischer method (general method)

3 Product categories

Ethanol for industrial use is divided into 95.0% ethanol and 99.5% ethanol.

4 Requirements

4.2 Ethanol for industrial use shall meet the requirements of Table 1.

4.1 Appearance. transparent liquid, no visible mechanical impurities

5 Test methods

Warning. Some test procedures specified in the test method may lead to dangerous situations, so the operator shall take appropriate safety and health measures.

6 Inspection rules

6.1 Inspection is divided into exit-factory inspection and type inspection. The appearance and the chromaticity, ethanol, acid, aldehyde, methanol, isopropanol, n-propanol, acetate, C4 + C5 alcohol, oxidation time of potassium permanganate and moisture in Table 1 are the exit-factory inspection items and shall be inspected batch by batch. In the case of normal production, type inspection shall be carried out at least once a month. Type inspection shall also be carried out in one of the following cases.

6.2 Under the condition of unchanged raw materials and processes, the actual batch of continuous production of the product is a batch, but the time for several production batches to constitute an inspection batch usually does not exceed 1 d.

6.3 Sampling of ethanol for industrial use shall be conducted in accordance with GB/T 3723, GB/T 6678, GB/T 6680. The total amount of samples taken shall not be less than 2 L. After mixing the samples evenly, put them in two clean;

6.4 The test result shall be determined according to the rounded value comparison method in GB/T 8170.

7 Marking, packaging, storage and transportation

8 Safety