摘要
裂解碳五两段萃取精馏工艺存在流程长等问题。本文研究了采用反应精馏的一段萃取工艺,确定了二聚过程中的主要反应及其Arrhenius方程。Aspen Plus软件模拟计算结果表明,反应精馏过程与90℃下停留3.5h的热二聚过程相比,异戊二烯聚合损失率减少40.68%,生成的共二聚体降低35.41%,异戊二烯和间戊二烯的自二聚体降低72.29%,环戊二烯二聚的选择性提高。先反应精馏脱除重组分再脱除炔烃可使进入萃取单元的炔烃降低,满足异戊二烯产品中炔烃质量分数小于50×10-6,在萃取和解析过程后通过精馏使环戊二烯质量分数小于1×10-6,得到聚合级异戊二烯产品。本研究提出的一段萃取分离流程短,投资和操作费用低,异戊二烯损失少,再生溶剂要求低。
The technology combining reactive distillation with one-stage extraction was proposed to replace the two-stage extractive distillation. The dimerization reactions and their Arrhenius equations were determined. The processes of thermal dimerization reaction and reactive distillation were simulated with Aspen Plus respectively. The results showed that the loss of isoprene decreased by 40.68 % by the reactive distillation process and the selectivity of cyclopentadiene dimerization increased. Alkynes entering extractive distillation decreased so that alkynes in isoprene product obtained later were lower than 50×10^-6 and cyclopentadiene was lower than 1 ×10^-6 by distillation after extractive distillation and stripping, and thus polymer-grade isoprene was obtained. The one-stage extraction technology has the advantages of short flow scheme, low loss of isoprene and low requirement for regenerating solvent.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2009年第4期714-720,共7页
Chemical Industry and Engineering Progress
关键词
裂解碳五
反应精馏
萃取
异戊二烯
cracked C5
reactive distillation
extraction
isoprene
