GB/T 1628-2020 Glacial acetic acid for industrial use
Warning——This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any national regulatory conditions.
1 Scope
This standard specifies the technical requirements, test methods, inspection rules, as well as marking, packaging, transportation and storage of glacial acetic acid for industrial use.
This standard is applicable to the production, inspection and sales of glacial acetic acid for industrial use.
Molecular formula: C2H4O2
Structural formula:
Relative molecular mass: 60.05 (as per the international relative atomic mass in 2016)
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB 190 Packing symbol of dangerous goods
GB/T 601 Chemical reagent - Preparations of reference titration solutions
GB/T 602 Chemical reagent - Preparations of standard solutions for impurity
GB/T 603 Chemical reagent - Preparations of reagent solutions for use in test methods
GB/T 3049 Chemical products for industrial use - General method for determination of iron content - 1,10-phenanthroline spectrophotometric method
GB/ T 3143 Color determination method of liquid chemicals (Hazen unit - Platinum-cobalt scale)
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)
GB/T 6324.2 Test method of organic chemical products - Part 2: Determination of dry residue after evaporation on a water bath for volatile organic liquids
GB/T 6324.8 Test methods of organic chemical products - Part 8: Determination of water of liquid products - Carl·fischer coulometric method
GB/T 6678 General principles for sampling chemical products
GB/T 6680 General rules for sampling liquid chemical products
GB/T 6682 Water for analytical laboratory use - Specification and test methods
GB/T 7533 Determination for crystallizing point of organic chemical products for industrial use
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 9722 Chemical reagent - General rules for the gas chromatography
GB/T 21187 Atomic absorption spectrophotometer method
3 Technical requirements
3.1 Appearance: Transparent liquid, free of suspended solids and mechanical impurities.
3.2 Glacial acetic acid for industrial use shall meet the technical indexes shown in Table 1.
Table 1 Technical indexes
Item Index
Type I Type II
Chromaticity/Hazen unit (Pt-Co scale) ≤10 ≤10
Acetic acid, ω/% ≥99.8 ≥99.5
Moisture content, ω/% ≤0.15 ≤0.20
Formic acid, ω/% ≤0.03 ≤0.05
Acetaldehyde, ω/% ≤0.02 ≤0.03
Evaporation residue, ω/% ≤0.005 ≤0.01
Iron (Fe), ω/% ≤0.00004 ≤0.0002
Potassium permanganate time /min ≥120 ≥30
Propionic acid, ω/% ≤0.05 ≤0.08
Note: According to the requirements of users for product quality, it is divided into Types I and II products.
4 Test methods
Warning——The operator shall take appropriate safe and protective measures, for some test procedures specified in the test methods may cause danger.
4.1 General requirements
For the purpose of this standard, unless otherwise specified, all the reagents and water used refer to analytical reagents and Grade 3 water specified in GB/T 6682.
Foreword i
1 Scope
2 Normative references
3 Technical requirements
4 Test methods
5 Inspection rules
6 Marking, packaging, transportation and storage
Annex A (Normative) Relationship between crystallization point and content of glacial acetic acid
Annex B (Normative) Preparation of chromatographic packed column for determination of formic acid mass fraction
Annex C (Normative) Determination of relative mass correction factor of formic acid
Annex D (Normative) Determination of propionic acid in reference acetic acid
Annex E (Normative) Determination of relative mass correction factor of propionic acid
Annex F (Informative) Safety
