丁二烯精馏外文翻译.doc

化工与材料工程学院 毕业设计外文翻译 年产13，5万吨丁二烯的精馏工艺设计 13.5 million tons of butadiene distilldtion process design 学生学号 学生姓名 专业班级 过控0805 指导教师 教授 完成日期 2011.9.3 吉林化工学院 Jilin Institute of Chemical Technology 翻译原文 Title: Process for the separation of butadiene by plural stage extractive distillation Document Type and Number: United States Patent 4128457 Abstract: Butadiene is recovered from a hydrocarbon fraction containing it together with butenes and acetylene hydrocarbons by introducing said fraction into a first extractive distillation column, feeding aqueous acetonitrile into said column above the introduction point of said fraction and extracting a vapor stream containing butadiene below said introduction point; feeding said vapor stream into a second extractive distillation column, feeding aqueous acetonitrile above the introduction point of said vapor stream and recovering a vapor stream consisting essentially of butadiene at the top of said second column; and rectifying this last vapor stream to recover pure butadiene. We claim:1. A process for the separation and recovery of 1,3-butadiene from a hydrocarbon mixture containing it, which comprises: introducing into an extractive distillation column having at least 150 plates, operating at a pressure of 3.5-5.5 atmospheres and at a bottom temperature of 110°-140° C. and head temperature of 30°-50° C., a stream of vaporized hydrocarbon fraction containing butadiene together with butenes and acetylene hydrocarbons at a point intermediate between the head and the bottom and feeding aqueous acetonitrile at one or more points of the columm between the head and the point of introduction of the hydrocarbon fraction; recovering at the head of the column a stream consisting essentially of butenes, recovering at the bottom aqueous acetonitrile and removing at an intermediate point, situated lower than that of the introduction of the hydrocarbon fraction, a vapor stream containing bu