2-PH装置加氢单元废液回收工艺研究

Research on Waste Liquid Recovery Process of Hydrogenation Unit of 2-PH Plant

丁烯氢甲酰化制2-PH(2-丙基庚醇)的生产工艺包含两步饱和加氢精制过程,其中前后两座精馏塔产生大量连续废液排放。本文主要研究了通过增设减压精馏系统对2-PH装置加氢精制单元排放废液进行精馏分离后回用的可行性,以期可以回收废液中的大部分有效组分并增加2-PH产量。结果表明,通过减压精馏可回收废液中90%以上的2-PH,回收液可以加压引回至原装置加氢精制单元进行进一步加氢或者单独加氢,得到合格产品。同时,基于Aspen Plus软件进行了模拟分析,并完成投资费用估算及初步经济性测算,为国内2-PH装置同类型废液处理提供参考。

The production process of hydroformylation of butene to 2-PH (2-propylheptanol) includes a two-step saturated hydrofining process,in which a large amount of continuous waste liquid is discharged from the front and rear distillation towers.In this paper,the feasibility of reusing the waste liquid discharged from the hydrofining unit of 2-PH plant by adding a vacuum distillation system is studied in order to recover most of the effective components in the waste liquid and increase the 2-PH yield.The results show that over 90% of 2-PH in the waste liquid can be recovered through vacuum distillation,and the recovered liquid can be pressurized and returned to the original hydrofining unit for further hydrogenation or separate hydrogenation to obtain qualified products.At the same time,simulation analysis is conducted based on Aspen Plus software,and investment cost estimation and preliminary economic calculation are completed,which can provide reference for the treatment of similar waste liquids in domestic 2-PH plants.