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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 5.0h, alkyd molar ratio of 6:1, 1.0% 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 ¡æ under the distillate, as dimethyl succinate, the interception of 110 ~ 120 ¡æ under the fractions for Dimethyl glutarate , the interception of 145 ~ 155 ¡æ under the distillate, is dimethyl adipate. The use of binary distillation from acid ester by transesterification of the binary system were acid-ethylhexyl the color is very light, indicating that by esterification can be effectively separated mixed dicarboxylic acid.
Key words: mixed dibasic acid; toluenesulfonate; transesterification; mixed two yuan Dimethyl
II
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