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Study on Chemical Process of Dichlorohydrin Via Glycerol

Author: ChenDengMin
Tutor: ZhuWeiHong；ZhangXiaoZuo
School: East China University of Science and Technology
Course: Pharmaceutical Engineering
Keywords: Glycerol Dichlorohydrin Succinic acid Extraction Catalyst recovery
CLC: TQ223.26
Type: Master's thesis
Year: 2012
Downloads: 81
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Abstract


The main application of dichlorohydrin in industry is used as a raw material for producing epichlorohydrin. In the chemical processes of dichlorohydrin, the traditional methods include:i) allyl chloride route with long chemical processes and high investment in equipments; ii) allyl acetate route with high energy consummation and large waste water. In contrast, the chemical process of dichlorohydrin from glycerol, a byproduct of biodiesel, is becoming quite attractive, and the relative technique has been well-developed in the modem industry.In the dissertation, the chemical process of dichlorohydrin from the chlorination of glycerol was investigated in the lab experiments, and optimized by pilot scale production as follows.1. The optimized conditions:the reaction temperature 108～110℃, the catalyst succinic acid with the catalyst loading of 5%(w/w), the dichlorohydrin loading 80～81%, and the monochlorohydrin loading 9-10% at end of the reaction.2. The retention time of the continuous production is 10 h.3. As a result of secondary reaction, the amount of distillation scraps is increased with recycled catalyst. In order to keeping the retention time, parts of the distillation scraps should be removed.4. Extraction is the post-processing method of distillation fraction and the extractant is trioctyl phosphate. The amount of extractant is 0.6-0.7:1 and extraction times are 5. In order to keeping extraction efficiency, the best extraction temperature is 20～25℃and the highest extraction temperature is 30℃. The extraction reservoir becomes acidic after extraction, which should not be washed but directly saponified.5. The removed distillation scraps could be distilled in higher temperature, and then the dichlorohydrin, monochlorohydrin and the catalyst are recovered by acid hydrolysis.

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CLC: > Industrial Technology > Chemical Industry > Basic Organic Chemistry Industry > The production of aliphatic compounds ( acyclic compounds) > Aliphatic alcohols (alcohols, hydroxy compounds) and its derivatives > Alcohol derivatives > Olefin oxides ( epoxides,cyclic ethers )
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