GB/T 6017-2021Determination of purity and hydrocarbon impurities of butadiene for industrial use—Gas chromatographic method (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents" Drafting.

This document replaces GB/T 6017-2008 "Industrial butadiene purity and hydrocarbon impurities determination gas chromatography", and compared with GB/T 6017-2008, the main technical changes are as follows.

a) Added the chromatographic conditions of the 100 m Al2O3/KCl capillary column in series (see 6.2, 5.2 in the 2008 edition);

b) Modified the chromatographic conditions of the Al2O3/KCl type capillary column (see 6.2, 5.2 in the 2008 edition);

c) The technical requirements of flash vaporization device are added to the sampling method (see 6.4.2); the method of completely vaporizing a small amount of liquid sample is deleted (5.3.2.1 of the 2008 version);

d) Modified the determination of the mass correction factor of the correction area normalization method in the test procedure (see 8.2.1, 7.1.2 of the 2008 edition);

e) Modified the expression method and calculation formula of the external standard method (see 8.3, 7.2 of the 2008 edition);

f) The residues in other impurities deducted in the calculation of the purity of butadiene are modified to water, and the determination method of other impurities is added (see 8.2.3, 8.3.3, 7.1.4, 7.2.2 of the 2008 version);

g) Re-determined the repeatability limit (r) (see Chapter 10, Chapter 9 of the 2008 edition);

h) Added quality control (see Chapter 11);

i) The chromatographic conditions in Appendix A have been deleted (see Appendix A of the 2008 edition).

1 Scope

This document specifies the use of gas chromatography to determine the purity of industrial butadiene and hydrocarbon impurities: ethane, ethylene, propane, propylene, acetylene, isobutane, n-butane, propadiene, trans-2-butene, isobutene, 1-butene, cis-2-butene, isopentane, n-pentane, propyne, 1-butyne, vinyl acetylene and the content of 1,2-butadiene.

This document applies to the determination of samples of industrial butadiene with a hydrocarbon impurity content of not less than 0.0003% (mass fraction) and a purity greater than 98% (mass fraction).

Unless otherwise specified, the industrial butadiene and butadiene in this document refer to 1,3-butadiene.

2 Normative references

The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 3723 General Rules for Sampling Safety of Industrial Chemical Products

GB/T 6015 Determination of trace dimers and residual extractants in butadiene for industrial use. Gas chromatography

GB/T 6020 Determination of tert-butylcatechol (TBC) in butadiene for industrial use

GB/T 6023 Determination of trace water in butadiene for industrial use-Karl Fischer coulometric method

GB/T 8170 Numerical rounding rules and the expression and determination of limit values

GB/T 13290 Industrial Propylene and Butadiene Liquid Sampling Method

SH/T 1494 Volumetric Method for the Determination of Trace Carbonyl Compounds in C4 Hydrocarbons

3 Terms and definitions

There are no terms and definitions that need to be defined in this document.

4 Principles of the method