双氧水法制环氧丙烷装置废水醇醚回收技术与经济效益分析

双氧水法制环氧丙烷装置(HPPO)废水具有排放总量大、化学需氧量(COD)高、含盐量高、可生化性差的特点。采用多级差压热耦合精馏技术、环保型可循环共沸精馏技术和MVR热泵精馏技术相结合,对HPPO废水进行醇醚回收,在低能耗的同时实现了HPPO废水中高附加值有机物总回收率95%以上,丙烯利用率提高3~5百分点,除盐率接近100%,大幅降低了后续废水处理的难度。在化工行业节能减排、降本增效的大背景下,具有显著的经济效益和社会效益。

基于动态模式分解的精馏吸收状态变量非设计条件下的重构与预测

精馏和吸收作为典型的非线性过程,其操作过程中存在大量描述系统特征的状态变量。为了对这些状态变量进行重构和预测,实现精馏吸收过程的实时数字孪生,通过动态模式分解算法(DMD)获取非线性系统的近似线性化模型,用于快速获取精馏吸收过程中各级浓度、流量、温度和持料量等状态变量。在此基础上,应用Kalman滤波器对DMD生成的线性模型进行实时校正,使得在非设计和有限测量条件下,也可以有效地预测吸收或精馏的状态变量,而无须重新训练模型。

The Crystallization Process in Petrochemical Industry

Crystallization is a widely used product refining process.Understanding the characteristics of the crystallization process in the petrochemical industry is helpful to selecting and designing new crystallization processes.This review briefly introduces the characteristics of the crystallization process,summarizes the crystallization processes applied in petrochemical industry,and discusses some points for crystallization process design.Crystallization in the petrochemical process is mainly used in the purification of polymer monomers and is often a unit operation in the whole refining process.Designing a reasonable crystallization process requires consideration of process safety,feasibility,and economy from an overall perspective.