Preparation of epichlorohydrin from by-product glycerine of waste oil biodiesel
LI Hui-wen, MIAO Chang-lin, YANG Ling-mei, LV Peng-mei, WANG Zhong-ming, YUAN Zhen-hong
Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Key Laboratory of Renewable Energy of CAS, Guangzhou Institute of Energy Conversion of CAS, Guangzhou 510640, China
Abstract: In order to extend the industrial chain of biodiesel,epichlorohydrin (ECH) is produced from crude glycerol,a by-product of biodiesel from waste oils.Crude glycerol is firstly purified into industrial grade glycerol and then ECH is prepared from industrial grade glycerol through chlorination and cyclization.Using a flow of 200 mL/min HCL gas as chlorinating agent and adipic acid as catalyst,dichloropropanol (DCP) is synthesized by three times of vacuum dehydration under the optimum conditions that the reaction temperature maintains at 105℃ and the mass content of adipic acid is 7.5%.The chlorination yield reaches 93.2% and the conversion of glycerol is 96.7%.ECH is obtained through cyclization of DCP over sodium hydroxide.Through single factor experiments,the optimum conditions of cyclization reaction are obtained as follows:the reaction lasts for 30 min,the molar ratio of sodium hydroxide to DCP is 1.2:1,and reaction temperature maintains at 90℃.Under these conditions,the yield of cyclization can achieve 89.5%.
李惠文, 苗长林, 杨铃梅, 吕鹏梅, 王忠铭, 袁振宏. 废油脂生物柴油副产甘油制备环氧氯丙烷的研究[J]. 现代化工, 2020, 40(8): 78-82.
LI Hui-wen, MIAO Chang-lin, YANG Ling-mei, LV Peng-mei, WANG Zhong-ming, YUAN Zhen-hong. Preparation of epichlorohydrin from by-product glycerine of waste oil biodiesel. Modern Chemical Industry, 2020, 40(8): 78-82.
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