GB/T 4649-2018Ethylene glycol for industrial use (English PDF)

Foreword

This Standard is drafted in accordance with the rules given in GB/T 1.1-2009.

This Standard replaces GB/T 4649-2008 "Ethylene glycol for industrial use - Specification".

Compared with GB/T 4649-2008, the main changes of this Standard are as follows.

- Delete the description of production process of ethylene glycol (see Clause 1; Clause 1 of the 2008 edition);

- Delete the technical requirements for qualified products (see Table 1; Table 1 of the 2008 edition);

- CHANGE "Superior product" to "Polyester grade" and "First-class product" to "Industrial grade" (see Table 1; Table 1 of the 2008 edition);

- CHANGE the appearance requirement of polyester grade and industrial grade products from "Colorless and transparent without mechanical impurities" to "Transparent liquid, without mechanical impurities" (see Table 1; Table 1 of the 2008 edition);

- CHANGE the content index of polyester grade ethylene glycol from ">=99.8%" to ">=99.9%", and the content index of diethylene glycol from "<=0.10%" to "<=0.050%". CHANGE the diethylene glycol content of industrial grade ethylene glycol from "<=0.80%" to "<=0.600%", and the water content index from "<=0.10%" to "<=0.08%" (see Table 1; Table 1 of the 2008 edition);

- ADD 1,2-butanediol, 1,4-butanediol, 1,2-hexanediol, and vinyl carbonate items with the index "Report" (see Table 1; Table 1 of the 2008 edition);

- ADD 250 nm for the polyester grade ultraviolet transmittance with the index "Report" (see Table 1; Table 1 of the 2008 edition);

- For polyester grade, ADD chloride ion item and test method, with the index "<=0.5 mg/kg" (see Table 1 and 4.14; 5.7 of the 2008 edition);

- CHANGE the unit of measurement for items such as acidity, iron, ash content, aldehyde content from "%" to "mg/kg" (see Table 1; Table 1 of the 2008 edition);

- Modify the gravimetric test requirements for the dispute of appearance visual determination results (see 4.3; 4.1 of the 2008 edition);

- Modify the determination method of ethylene glycol content. Delete the previous formula 1.ADD the determination method of 1,2-butanediol, 1,4-butanediol, 1,2-hexanediol, and vinyl carbonate content (see 4.4; 4.2, 4.10 of the 2008 edition);

- For color determination, ADD GB/T 6324.6; USE GB/T 3143 as the arbitration method; MOVE the relevant content into Appendix A (see 4.5, Appendix A; 4.3 of the 2008 edition);

- For density determination, ADD U-shaped vibrograph method of GB/T 2013-2010; delete the temperature correction in test by the density bottle method. USE GB/T 4472 density bottle method as the arbitration method. MOVE the relevant content into Appendix B (see 4.6, Appendix B; 4.4 of the 2008 edition);

- For determination of boiling range, ADD 104C-75 thermometer meeting GB/T 7534-2008 (see 4.7);

- For determination of water content, ADD SH/T 1055 and use this method as the arbitration method (see 4.8; 4.6 of the 2008 edition);

- For acidity determination, ADD the provision that manual method is used as the arbitration method (see 4.9; 4.7 of the 2008 edition);

- CHANGE the sampling amount for determination of iron content from "80 g" to "70 g" (see 4.10; 4.8 of the 2008 edition);

- Modify the analytical balance and constant weight requirements for determination of ash content. CHANGE the sensitivity from "0.1 mg" to "0.01 mg"; CHANGE "porcelain crucible" to "platinum crucible"; MOVE the relevant content into Appendix C (see 4.11, Appendix C; 4.9 of the 2008 edition);

- Modify the starting conditions of type inspection (see 5.1; 5.1 of the 2008 edition);

- CHANGE the judgement method for the inspection result from "full value comparison method" to "rounded-off value comparison method" (see 5.3);

- Delete Clause "Safety" and move the relevant content into the informative appendix (see Appendix E; Clause 7 of the 2008 edition).

1 Scope

This Standard specifies the technical requirements, test methods, inspection rules, marks, labels, and accompanying documents, packaging, transportation, and storage of ethylene glycol for industrial use.

This Standard applies to ethylene glycol used as monomers for the production of polyesters and alkyds and as electrolytes, antifreezes, plasticizers, solvents, etc. for electrolytic capacitors.

2 Normative references

The following documents are indispensable for the application of this document. For the dated references, only the editions with the dates indicated are applicable to this document. For the undated references, the latest edition (including all the amendments) are applicable to this document.

GB/T 2013-2010 Standard test method for density of liquid petrochemical products

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 4472-2011 Determination of density and relative density for chemical products

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

GB/T 6324.6 Test method of organic chemical products - Part 6: Determination of color for liquids - Tristimulus colorimetry

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

3 Technical requirements

The technical requirements for ethylene glycol for industrial use are shown in Table 1.

4 Test methods

5 Inspection rules

6 Marks, labels, and accompanying documents

6.1 Packaging containers of ethylene glycol products for industrial use shall have a strong mark, indicating manufacturer name, product name, this Standard number, lot number or production date, net content.

6.2 Ethylene glycol is not a hazardous chemical, but it has certain toxicity and danger. For related safety requirements, see Appendix E.

7 Packaging, transportation, and storage