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针对甲醇-乙腈共沸体系的分离,建立了一种加压-常压的变压精馏分离工艺.采用Aspen Plus软件模拟计算,优化加压塔和常压塔的理论板数、回流比、进料位置及能耗.结果表明,较优工艺参数为加压塔操作压力500.0 k Pa,回流比2.4,35块理论板、第23块理论板进料;常压塔操作压力101.3 k Pa,回流比5.6,40块理论板、第13块理论板进料.该条件下高压塔塔釜可得到合格乙腈产品,低压塔塔釜可得到合格甲醇产品.优化后再沸器节约能耗约35.3%,冷凝器节约能耗约45.8%.
Aiming at the separation of methanol-acetonitrile azeotropic system, a pressure-atmospheric pressure distillation separation process was established.Aspen Plus software was used to simulate and optimize the theoretical plates, reflux ratio, Feeding position and energy consumption.The results showed that the optimal process parameters were: operating pressure of 500.0 kPa, reflux ratio of 2.4, 35 theoretical plates, 23th theoretical plate feed, atmospheric pressure tower operating pressure of 101.3 kPa, Reflux ratio of 5.6, 40 theoretical plates, the first 13 theoretical plates feed under the conditions of high-pressure reactor can get qualified acetonitrile product, low-pressure reactor can get qualified methanol product. Optimized reboiler energy savings of about 35.3 %, Condenser energy consumption savings of about 45.8%.