丙烯直接环氧化溶剂回收过程的能耗模拟与优化

Energy consumption simulation and optimization of solvent recovery process in direct epoxidation of propylene

为了提高1500 t/a环氧丙烷中试装置的能量利用水平,在建立了热力学模型的基础上,采用PRO/II流程模拟软件对装置的溶剂回收塔进行计算,并考察了操作条件对再沸器加热蒸汽消耗量的影响。经中试装置验证,采用优化操作条件后实际蒸汽耗量可从10 t/tPO下降到9.4 t/tPO,降幅为6%。鉴于单塔节能的挖潜效果欠佳,本文设计了溶剂回收的双效精馏流程。模拟计算的结果表明,可使蒸汽消耗量从单塔优化后的9.27 t/tPO下降到5.68 t/tPO,节能率达到38.6%,为万吨级装置的设计提供参考依据。

In order to improve the 1500t/a propylene oxide pilot plant energy utilization level,process simulation software PRO/II was used to simulate the solvent recovery distillation and investigate the operation conditions on its steam consumption.The verification by the pilot plant demonstrated that the practical consumption under optimized operating conditions could be reduced from 10.0t/tPO to 9.4t/tPO by 6%.Considering the unsatisfactory effect of energy saving in a single tower,a double-effect distillation process was proposed and calculation results showed that the simulated consumption could be cut from 9.27t/tPO to 5.68t/tPO by 38.6% comparing with the optimized single-effect distillation.