塔釜闪蒸热泵辅助反应精馏生产丙酸丙酯新工艺

New process for production of propyl propionate by bottom flashing and heat pump assisted reactive distillation process

针对丙酸丙酯生产工艺能耗大的特点,提出了一种塔釜闪蒸热泵辅助反应精馏生产丙酸丙酯的新工艺。利用AspenPlus软件对常规反应精馏生产丙酸丙酯流程和塔釜闪蒸热泵辅助反应精馏生产丙酸丙酯流程进行模拟,对塔釜闪蒸热泵辅助精馏流程中的节流阀出口压力进行了优化,得到最优工艺操作条件。并利用温焓图比较了2个流程的热回收情况。最后对常规反应精馏生产丙酸丙酯流程与塔釜闪蒸热泵辅助精馏流程的能耗和年度总投资进行计算比较。结果表明,与常规反应精馏流程相比,塔釜闪蒸热泵辅助精馏流程降低能耗33.89%,年度总费用降低42.35%,是一种经济、节能的工艺流程。

In view of the high energy consumption of propyl propionate production process,a novel bottom flash-heat pump assisted reactive distillation process(BF-ADP)is proposed.Aspen Plus is employed to simulate the traditional reactive distillation propyl propionate production process(the base process)and BF-ADP,respectively.The outlet pressure of the throttle valve in the BF-ADP is optimized,and the optimal operation conditions are obtained.In addition,the Temperature-Heat diagram is used to compare the heat recovery between the base process and BF-ADP.The total utility consumption(TUC)and total annual cost(TAC)of both the base process and BF-ADP are calculated and compared.The results reveal that BF-ADP can cut down 33.89%of TUC and 42.35%of TAC compared with the base process,showing that BF-ADP is an economic and energy-saving process.