齐齐哈尔大学化学工程与工艺专业毕业设计论文(20万吨甲醇羰基化法醋酸车间轻组分回收工段)...doc

摘要
甲醇羰基化法醋酸又名尼龙酸,是己二酸生产过程产生的副产物,仅国内己二酸生产企业每年就副产混合二元酸40-60万吨。由于其含杂质、水分多,颜色呈绿色或黄褐色,难以利用。国外一般将其送进污水处理装置作焚烧或填埋处理;国内有采用重结晶法回收,但回收率低于60%,废水量较大,不仅对环境造成污染,而且也造成资源的浪费。为了物尽其用,本文开展了应用基础研究以C4-C6混合二元酸为原料、对甲苯磺酸为催化剂,制备混合二元酸二甲酯,并利用减压精馏得到纯净的二甲酯。实验中考查了各种反应的影响因素,并利用制备的混合二甲酸二甲酯与异辛醇进行酯交换制备混合二元酸二异辛酯。
关键词:甲醇羰基化;醋酸;酯交换;混合二元酸二甲酯
Abstract
Mixed dibasic acid (DBA), also known as nylon acid, adipic acid production process by-products, only domestic producers of adipic acid by-product mixture in each of dicarboxylic acid 40-60 million tons. Because of its impurities, water content, the color green or brown, it is difficult to use. Foreign general to be sent to sewage treatment plant for incineration or landfilling; domestic use recrystallization recovery, but recovery was less than 60%, large amount of wastewater, not only pollute the environment, but also a waste of resources.
In order to make the best use, this application of basic research carried out to C4-C6 dicarboxylic acid as raw material mixture, p-toluenesulfonic acid as catalyst, prepared by mixing two yuan acid ester, and the use of vacuum distillation to get pure dimethyl ester. Experiment examined the response of various factors, and use a mixture of dimethyl ester prepared with different octanol prepared by mixing two yuan for transesterification ethylhexyl sebacate.
According to the experimental data show that, by esterification of dicarboxylic acid mixture separation process route is feasible. Esterification of the appropriate reaction conditions: reaction time , alkyd molar ratio of 6:1, % mixed acid catalyst, in this condition, binary acid ester yield of 89%. Esters derived from crude esterification can be carried out under the pressure of 40mmHg vacuum distillation, the interception of 95 ~ 105 ℃ under the distillate, as dimethyl inate, the interception of 110 ~ 120 ℃ under the fractions for Dimethyl glutarate , the interception of 145 ~ 155 ℃ under the distillate, is dimethyl adipate. The use of binary dist