脱氢法生产乙酸乙酯的流程模拟与优化

Simulation and optimization of synthesizing ethyl acetate via ethanol dehydrogenation

运用化工流程模拟软件Aspen Plus,对乙醇脱氢生产乙酸乙酯的工艺流程进行模拟计算分析,建立了10 wt/a乙酸乙酯生产工业过程的详细流程,最终乙酸乙酯产品纯度达99.98%,收率可达98.26%。对精馏工段关键的乙醇塔和粗塔组成的差压精馏体系进行了灵敏度分析,重点考察了进料板位置、回流比、塔顶采出量等工艺参数对精馏塔分离效果和操作能耗的影响,得到优化的参数,即乙醇塔新鲜进料板位置为第12块,循环物料进料位置为第9块,回流比2.10,塔顶采出量为33500 kg/hr:粗塔进料板位置为第9块,回流比为1.43,塔顶采出量为21000 kg/h。本文研究结果为工业上选择合适的设备参数和操作参数提供有力的数据支持。随后对原换热网络进行了进一步优化设计,节省能耗24.56%。

Simulation of synthesizing ethyl acetate by direct dehydrogenation of ethanol is carried out on Aspen Plus platform. Established the detailed flowsheet of 10wt / a ethyl acetate in industrial production processes. Finally, the purity of ethyl acetate up to 99.98 % and the yield up to 98.26 %. The pressure-swing distillation that consisted of ethanol column and crude column are the key part in the whole distillation section. A sensitivity analysis of ethanol column and crude column is performed to determine the effects of feed stage, reflux ratio, overhead flowrate on the separation efficiency and energy consumption to obtain optimized parameters. The result shows that fresh feed and recycle stream of ethanol column are pumped on the 12th and 9th stage, optimized mole reflux ratio is 2.10 and distillate rate is 33580 kg/h; feed stage of crude column is 9th stage, reflux ratio is 1.43 and distillate rate is 21000 kg/h. This study provided strong support to select the right equipment and operation parameters of the industry. Subsequently, an optimization coupling is developed that can reduce energy by 24.56 %.