高效节能的乙腈连续精制工艺流程设计与模拟

Design and Simulation of Efficient and Energy- gaving Acetonitrile Continuous Refining Process

根据目前国内丙烯氨氧化法生产丙烯腈副产乙腈连续精馏工艺特点及其精制技术存在物耗与能耗高、产品回收率较低等问题，通过工艺流程分析及精馏过程的节能分析，在现有乙腈精制工艺基础上，应用变压精馏、多效精馏等特殊精馏技术，对原有工艺流程进行改造，设计高效、节能的乙腈连续精馏工艺新流程，并应用大型通用流程模拟软件对新流程进行模拟与优化，获得最佳工艺操作参数。模拟结果表明，在保证乙腈产品达到国际优级品质量指标的基础上，新流程较现有工艺流程节能39．6％，同时乙腈回收率提高到93％。

A novel efficient, energy saving acetonitrile continuous refining process was designed according to the feature of the original process based on the current propylene-ammoxidation process in domestic that produces acrylonitrile with acetonitrile as byproduct to solve the problems such as highly waste of material and energy, low product recovery, and so on. By process and energy saving analysis, some special distillation technologies such as pressure-swing distillation, multi-effect distillation were applied in novel process. Meanwhile, the large general process simulation software was used to simulate and optimize the designed process, and the best process operation parameters were obtained. Simulation results showed that the product quality indicator of novel process achieves the international superior grade, and saves 39.6% energy compared with the original process, while its recovery was improved to 93%.