公开(公告)号：US3906036A

公开(公告)日：1975-09-16

申请号：US71551168

申请日：1968-03-25

Applicant: CELANESE CORP

Inventor： DIRKS JERALD E ,  ORGAN GLENN E

IPC: C07C67/055 ,  C07C69/15 ,  H02K21/16 ,  C07C67/05

CPC classification number: H02K21/16 ,  C07C67/055 ,  Y02P20/584 ,  C07C69/01 ,  C07C69/15

Abstract: In a process for producing a derivative such as vinyl acetate from an olefin such as ethylene in the presence of a catalyst comprising a noble metal ion, an alkali metal acetate, and a redox agent comprising a copper (II) salt, in the course of which a portion of the copper (II) is deactivated by side reactions in which it is converted to copper oxalate which is then regenerated to an active form by treatment with hydrochloric acid at an elevated temperature, the treated liquid containing the regenerated catalyst tends to contain volatile organic chlorides (e.g. chloroform) which, upon recycle to the olefin reaction zone, tend to contaminate the product (e.g. vinyl acetate). Removal of these impurities from vinyl acetate by distillation is difficult if not impossible when a very high purity vinyl acetate is desired. The invention consists of removing these volatile chlorides, by vaporization processes, from the regenerated catalyst-containing liquid before it is returned to the olefin reaction zone. In a particular embodiment, the vaporization comprises stripping with a fixed gas containing molecular oxygen, whereby the catalyst is returned in a highly oxidized state to the olefin reaction zone.

Abstract translation: 在包含贵金属离子，碱金属乙酸盐和包含铜（II）盐的氧化还原剂的存在下，在烯烃如乙烯中生产衍生物如乙酸乙烯酯的方法，在过程中 其中一部分铜（II）通过副反应而失活，在其中将其转化为草酸铜，然后通过在高温下用盐酸处理再生成活性形式，含有再生催化剂的处理液倾向于含有 挥发性有机氯化物（例如氯仿），其在再循环到烯烃反应区时倾向于污染产物（例如乙酸乙烯酯）。 当需要非常高纯度的乙酸乙烯酯时，通过蒸馏从乙酸乙烯酯中除去这些杂质是困难的，甚至是不可能的。 本发明包括通过汽化过程从含再生催化剂的液体中除去这些挥发性氯化物，然后再返回到烯烃反应区。 在一个具体实施方案中，蒸发包括用含有分子氧的固定气体汽提，由此催化剂以高度氧化的状态返回到烯烃反应区。