Abstract: The process of succinic acid purifying from product of maleic anhydride hydrogenation was studied. The effects of distillation pressure, temperature and reflux ratio on the process of vacuum distillation were investigated; it also discussed the effects of reaction time and molar ratio of water to succinic anhydride on hydrolysis; meanwhile, the effect of temperature on the crystallization was concerned. The pure succinic acid was acquired through vacuum distillation, hydrolyzation and crystallization. The process conditions of purifying technology of succinic acid were detemined. The results show that the yield of succinic acid is more than 70% and purity of the product can reach 99.5% even more under the conditions of vaccum distillation temperature 75~85 ℃, distillation pressure 200~300 Pa, hydrolysis temperature 100 ℃, molar ratio of water to succinic anhydride 4~5, reaction time 2 h.

Key words: Succinic acid,    ,  Vacuum distillation,    ,  Hydrolyzation,   ,  Crystallization

摘要： 对顺酐加氢产物精制丁二酸的工艺进行了研究。考察了蒸馏压力、蒸馏温度及回流比对减压蒸馏过 程的影响;考察了水解时间、水与酸酐物质的量比对水解过程的影响;考察了结晶温度对结晶过程的影响。确定了顺酐加氢产物减压蒸馏后水解结晶精制丁二酸的方法及工艺条件。结果表明,在减压蒸馏温度为75~85 曟,蒸馏压力为200~300Pa,水解温度为100曟,水与丁二酸酐物质的量比为4~5,水解时间为2h的条件下,得到的丁二酸产品收率曒70%,纯度曒99.5%。

关键词: 丁二酸,    , 减压蒸馏,    , 水解,   , 结晶