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Synthesis of Hydrogenated Cocoamidopropyl Betaine (CAB-H)

Author: XuHui
Tutor: WangLiMin；ShiZuoWen
School: East China University of Science and Technology
Course: Industry Technology and Engineering
Keywords: Hydrogenated Cocoamidopropyl Betaine Amidation Quaternarization
CLC: TQ423.12
Type: Master's thesis
Year: 2011
Downloads: 133
Quote: 0
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Abstract


The synthesis procedure of an amphoteric surfactant CAB-H has been optimized according to the literature and specific situation of the workshop in our company. This procedure consists of two steps. Firstly, hydrogenated cocoamidopropyl dimethylamine (PKO-H) was synthesized by hydrogenated lauric acid and N, N-dimethylaminopropyl-amine. The optimum reaction conditions involved the mole ration of N,N-dimethylamino-propylamine and hydrogenated coco acid was 1.10:1(mol/mol), and the reaction was heated at 160-170℃for 8h. The mass of catalyst powder was 0.1-0.2% of total materials input. In addition, the residual N, N-dimethylaminopropylamine in the products was controlled at the end of the reaction with degassing.Secondly, CAB-H was synthesized with chloroacetic acid, PKO-H and liquid caustic soda as raw materials. The influence of pressure, temperature, ratio of raw materials and the treatment of residual raw materials during the synthesis procedure were studied. Taking into account of the production costs, active substance content and cost performance, we selected chloroacetic acid:PKO-H=1.03:1(mol/mol) and heating at 80-83℃for 6h as the optimal reaction conditions. Moreover, the manufacturing situation of the product in the pilot production and large-scale production were also discussed.

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CLC: > Industrial Technology > Chemical Industry > Reagents and the production of pure chemicals > Surfactant > Ionic surfactants > Cationic
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