Determination of purity and impurities of ethylene glycol for industrial use by gas chromatography

doi:10.3724/SP.J.1123.2018.08030

Abstract

Abstract:

A new test method was established for the determination of purity and impurities of ethylene glycol (EG) by gas chromatography (GC) using a Rtx-624 column (30 m×0.32 mm×1.8 μm). The method determined not only the impurities in EG from the ethylene oxidation process, such as diethylene glycol, triethylene glycol and (1,3-dioxolan-2-yl)methanol, but also the impurities from the oxalate hydrogenation process, such as 1,2-butanediol, 1,4-butanediol, 1,2-hexanediol, and ethylene carbonate, etc. The method showed good repeatability and high detection sensitivity. The lowest LOD of the impurities reached to 0.0002% (mass fraction), and the recoveries of the impurities were in the range of 91.2%-105.4%. The proposed method can be applied in production control, product testing and market trade of ethylene glycol.

Key words: ethylene glycol (EG), gas chromatography (GC), purity and impurities

CLC Number:

O658

FAN Chenliang, ZHANG Yuhong, WANG Chuan, PENG Zhenlei, GAO Zhirong. Determination of purity and impurities of ethylene glycol for industrial use by gas chromatography[J]. Chinese Journal of Chromatography, 2019, 37(1): 116-120.

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