盐酸生产氯化胆碱工艺研究
发布时间：2019-06-08 07:21
【摘要】：有机氯化物生产中产生的副产盐酸,处理难度高,处理量大,且现有处理方法成本较高。针对这一问题,本文提出以副产盐酸和乙二醇为原料生产2-氯乙醇,进而生产饲料添加剂--氯化胆碱的副产盐酸处理路线。研究以连续反应精馏方式生产2-氯乙醇,分析了反应体系中各组分的物性,并根据常压下2-氯乙醇/水的共沸组成,确定了副产盐酸浓度应为28.42%,通过连续化小试验证了本方案的可行性。为适应市场,增强产品竞争力,考虑了装置产品的多元化,采用非均相共沸精馏法从2-氯乙醇/水共沸物中分离出高浓度2-氯乙醇产品,通过Aspen Plus进行了过程的概念设计,选择了最优共沸剂甲苯,并根据年度总费用最小对流程进行了优化,在模拟结果基础上进行了连续化的小试,结果表明2-氯乙醇产品纯度可达到99%以上,且回收率在93.5%,实验结果与模拟结果相吻合,为2-氯乙醇-水分离的工业化提供了参考。以2-氯乙醇/水共沸物和三甲胺水溶液为原料,进行了自催化反应制取氯化胆碱的实验。结果表明:在50℃下反应4~5h,得到氯化胆碱质量分数约为35%的水溶液,并在此基础上进一步研究了氯化胆碱水溶液的脱色和浓缩条件。最后根据2-氯乙醇、氯化胆碱的实验与模拟,拟定出盐酸生产氯化胆碱的工艺流程。
[Abstract]:The by-product salt acid produced in the production of organic chloride is difficult to treat, the treatment capacity is large, and the cost of the existing treatment methods is high. In order to solve this problem, the by-product hydrochloric acid treatment route of producing 2-chloroethanol from by-product hydrochloric acid and ethylene glycol, and then producing feed additive choline chloride, was put forward in this paper. The production of 2-chloroethanol by continuous reactive distillation was studied. the physical properties of each component in the reaction system were analyzed. According to the azeotropic composition of 2-chloroethanol / water at atmospheric pressure, the concentration of hydrochloric acid as by-product was determined to be 28.42%. The feasibility of the scheme is verified by a continuous small scale test. In order to adapt to the market and enhance the competitiveness of the product, considering the diversification of the product, the high concentration 2-chloroethanol product was separated from 2-chloroethanol / water azeotrope by heterogeneous azeotropic distillation method, and the conceptual design of the process was carried out by Aspen Plus. The optimal azeotrope toluene was selected and the process was optimized according to the minimum annual total cost. On the basis of the simulation results, a continuous small scale test was carried out. The results showed that the purity of 2-chloroethanol product could reach more than 99%. The recovery rate is 93.5%. The experimental results are in good agreement with the simulation results, which provides a reference for the industrialization of 2-chloroethanol-water separation. The preparation of choline chloride by autocatalytic reaction was carried out from 2-chloroethanol / water azeotrope and trimethylamine aqueous solution. The results showed that the aqueous solution with a mass fraction of choline chloride of about 35% was obtained by reaction at 50 鈩，
本文编号：2495105
[Abstract]:The by-product salt acid produced in the production of organic chloride is difficult to treat, the treatment capacity is large, and the cost of the existing treatment methods is high. In order to solve this problem, the by-product hydrochloric acid treatment route of producing 2-chloroethanol from by-product hydrochloric acid and ethylene glycol, and then producing feed additive choline chloride, was put forward in this paper. The production of 2-chloroethanol by continuous reactive distillation was studied. the physical properties of each component in the reaction system were analyzed. According to the azeotropic composition of 2-chloroethanol / water at atmospheric pressure, the concentration of hydrochloric acid as by-product was determined to be 28.42%. The feasibility of the scheme is verified by a continuous small scale test. In order to adapt to the market and enhance the competitiveness of the product, considering the diversification of the product, the high concentration 2-chloroethanol product was separated from 2-chloroethanol / water azeotrope by heterogeneous azeotropic distillation method, and the conceptual design of the process was carried out by Aspen Plus. The optimal azeotrope toluene was selected and the process was optimized according to the minimum annual total cost. On the basis of the simulation results, a continuous small scale test was carried out. The results showed that the purity of 2-chloroethanol product could reach more than 99%. The recovery rate is 93.5%. The experimental results are in good agreement with the simulation results, which provides a reference for the industrialization of 2-chloroethanol-water separation. The preparation of choline chloride by autocatalytic reaction was carried out from 2-chloroethanol / water azeotrope and trimethylamine aqueous solution. The results showed that the aqueous solution with a mass fraction of choline chloride of about 35% was obtained by reaction at 50 鈩，
本文编号：2495105
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