摘要
顺酐是一种重要的有机化工原料,目前顺酐的生产以正丁烷氧化法为主。氧化反应时,从反应器出来的顺酐气体只占反应混合气的0.5%～2%,因此顺酐回收工艺在顺酐生产过程中占有重要的地位。顺酐的回收主要采用有机溶剂吸收法。但国内现阶段采用的有机溶剂吸收法,溶剂在循环使用时溶剂系统中会累积一定量的焦油、富马酸以及其它副产物,形成胶状物质,导致设备堵塞;另外,溶剂循环时形成的富集物还会加速溶剂的分解,增加溶剂的消耗。本文提供一种新的溶剂精制工艺,对解吸塔出来的贫溶剂用碱液进行洗涤。有机溶剂经过碱洗,可以消除溶剂循环过程产生的溶剂分解以及形成胶状物堵塞设备的现象,提高溶剂的利用率,更好地发挥出有机溶剂对顺酐的吸收效果。
Maleic anhydride is an important organic chemical raw materials,the production of maleic anhydride to the present are mainly butane oxidation.Oxidation reactions,maleic anhydride from the reactor out of gas reaction mixture only 0.5%to 2%,the maleic anhydride and maleic anhydride recovery process in the production process plays an important role.Maleic anhydride absorption is mainly organic solvent absorption.However,at this stage by the domestic absorption of organic solvents,solvent when the solvents in the recycling system will accumulate a certain amount of tar,fumaric acid and other by-products,the formation of colloidal substances,leading to equipment plugged;In addition,the solvent circulation formed in the enrichment but also to accelerate the decomposition of solvent and increase the consumption of solvent.In this article,a new solvent refining process is provided,the poor solvent out of the desorption tower for washing with alkali,to remove the solvent decomposition in cycle processes and the formation of jelly plug the device phenomena, to improve the utilization of solvents give better play to the organic solvents on the absorption of maleic anhydride.
关键词
顺酐
吸收
有机溶剂
碱洗
精制
Maleic anhydride
absorption
organic solvents
alkaline washing
refining
