高纯异丁烷装置溶剂回收系统分析及优化改进  

ANALYSIS AND IMPROVEMENT OF SOLVENT RECOVERY SYSTEM IN HIGH PURITY ISOBUTANE PLANT

作　　者：卜博 Bu Bo(SINOPEC Engineering Incorporation, Beijing, P.C.100101)

机构地区：[1]中国石化工程建设有限公司

出　　处：《乙烯工业》2019年第2期20-25,I0001,共7页Ethylene Industry

摘　　要：乙腈是萃取精馏法的常用溶剂,萃取后的烃类需进行水洗脱除夹带的少量乙腈,水洗后的废水需送至溶剂回收系统,采出高浓度乙腈。某石化厂异丁烷装置的溶剂回收系统在实际运行中,遇到了塔顶采出再生溶剂中乙腈浓度经常低于设计值的问题。根据该装置的实测数据,通过对溶剂回收系统进料乙腈含量、进料塔板位置、装置原料组分中的杂质等因素进行模拟计算,分析塔顶产品不合格的原因,并提出相应的优化改进方案。Acetonitrile is a solvent commonly used for extractive distillation. Hydrocarbons after extraction need to be washed by water to remove the small amount of acetonitrile entrained. The washed water with small amount of solvent needs to be distillated in a solvent recovery system to recover regenerated solvent with high concentration of acetonitrile. An isobutane plant of a petrochemical company encounters a problem in its operation that the concentration of acetonitrile in the regenerated solvent recovered from the overhead of solvent recovery column is frequently lower than the design value. Accroding to the measured data of the plant, several factors including the acetonitrile content in the feed to solvent recovery system, the location of feed tray and the inpurities in feed components are calculated in simulation to analyze the reasons for the off-spec overhead product, and some corresponding improvement proposals are provided.

关 键 词：乙腈 回收率 精馏 

分 类 号：TQ221.14[化学工程—有机化工]