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1. 发明申请

US20050245775A1 Method for recovering trans-1,2-dichloroethene 有权
标题翻译：回收1,2-二氯乙烯的方法
公开(公告)号：US20050245775A1
公开(公告)日：2005-11-03
申请号：US10834408
申请日：2004-04-29
申请人： Clark Graybill , Stephen Lester
发明人： Clark Graybill , Stephen Lester
IPC分类号： C07B35/08 , C07C17/358 , C07C17/38 , C07C17/383 , C07C17/386 , C07C17/395
CPC分类号： C07C17/38 , C07C17/383 , C07C17/395 , Y02P20/127 , C07C21/08
摘要： Describes a method for recovering trans-1,2-dichloroethene from a liquid feed composition comprising both the cis- and trans-isomers of 1,2-dichloroethene and contaminating amounts of other chlorinated hydrocarbons, e.g., lower alkyl chlorinated hydrocarbons, such as C1-C2 chlorinated hydrocarbons. In one of the described methods, the liquid feed composition is introduced into a first distillation column 10 wherein the stereoisomers and chlorinated hydrocarbons more volatile than the stereoisomers are removed as overhead 12 and charged to a second distillation column 20. In column 20, the stereoisomers are separated from the more volatile chlorinated hydrocarbons, and a bottoms fraction 24 comprising the stereoisomers are charged to a reaction distillation column 30 wherein the cis-isomer, is isomerized to the trans-isomer in the liquid phase and in the presence of an organic free-radical initiator, e.g., an azonitrile initiator. Substantially pure trans-1;2-dichloroethene is recovered as overhead 32 from reaction distillation column 30.
摘要翻译：描述了从液体进料组合物中回收反式1,2-二氯乙烯的方法，该方法包括1,2-二氯乙烯的顺式和反式异构体和污染量的其它氯代烃，例如低级烷基氯化烃，如C 1 - 2 C 2氯化烃。在所述方法之一中，将液体进料组合物引入第一蒸馏塔10中，其中立体异构体和比立体异构体更易挥发的氯代烃作为塔顶馏出物12被除去并装入第二蒸馏塔20。在第20列中，将立体异构体与更易挥发的氯代烃分离，将包含立体异构体的塔底馏分24装入反应蒸馏塔30中，其中顺式异构体在液相中异构化成反式异构体，存在有机自由基引发剂，例如偶氮腈引发剂。从反应蒸馏塔30回收基本上纯的反式-1,2-二氯乙烯作为塔顶馏出物32。

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