GB/T 23967-2017Trimellitic Anhydride 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 23967-2009 "industrial use of trimellitic anhydride," compared with GB/T 23967-2009, the main technical differences as follows.

--- Increased the index of superior products, in which the appearance of white or slightly colored flaky solid, the mass fraction of trimellitic anhydride >= 96.5%, the mass fraction of phthalic anhydride is <=0.05%, the acid value (based on KOH) is >=873 mg/g, the melting chromaticity <=130Hazen units (platinum-cobalt color number) (see Chapter 3, 2009 Edition, Chapter 3);

--- Qualified indicators increased the phthalate limit of <= 0.10%, remove the indicators of the crystallization point (see Chapter 3, 2009 Edition Chapter 3);

--- Removed the crystallization point of the test method (see 2009 version 4.7);

--- Increasing the test method of phthalic anhydride (see 4.4).

1 Scope

This standard specifies the industrial use of trimellitic anhydride requirements, test methods, inspection rules and labeling, packaging, transportation, storage.

This standard applies to industrial trimellitic anhydride. Chemical Name: 1,3-Dihydro-1,3-dioxo-5-isobenzofurancarboxylic acid Chemical Abstracts Service (CAS) No. 552-30-7 Molecular formula: C9H4O5 Structure.

Relative molecular mass: 192.13 (according to the 2011 International relative atomic mass)

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 191 Packaging - Pictorial signs

GB/T 601 chemical reagent standard titration solution preparation

GB/T 603 chemical reagent test methods used in the preparation of preparations and products

GB/T 3723 Industrial Chemical Sampling Safety General

GB/T 6324.7-2014 Test methods for organic chemical products - Part 7: Determination of the melting color

GB/T 6678 General rules for sampling chemical products

GB/T 6679 General rules for sampling solid chemical products

GB/T 6682 analytical laboratory water specifications and test methods

GB/T 8170 rounded repair rules and limit values of the representation and judgment

GB/T 16631 General Principles of High Performance Liquid Chromatography

3 Requirements

Industrial indicators of trimellitic anhydride should be consistent with the provisions of Table 1.