申请人:NIPPON PETROCHEMICALS COMPANY, LIMITED
公开号:EP0316014A2
公开(公告)日:1989-05-17
A method for producing arylethylene comprising four steps : (I) bringing 1,1-diarylethane into contact with an acid catalyst in the presence of an inert gas to crack said compound to form arylethylenes and alkylbenzenes; (II) separating the reaction mixture obtained in the above cracking step (I) into at least a fraction mainly containing 1,1-diarylethane; (III) bringing said fraction mainly containing 1,1-diarylethane into contact with hydrogen gas in the presence of a hydrogenation catalyst; and (IV) recracking the hydrogenated fraction obtained in the preceding hydrogenation step (III) by recycling it into said cracking step (I).
This method is particularly useful for producing p-isobutylstyrene which is a starting material for preparing ibuprofen, a valuable medicine.
一种生产芳基乙烯的方法,包括四个步骤:(I) 在惰性气体存在下,使 1,1-二叔烷与酸催化剂接触,使上述化合物裂解,生成芳基乙烯和烷基苯; (II) 将上述裂解步骤(I)中得到的反应混合物至少分离成主要含有 1,1-二叔烷的馏分;(III) 在氢化催化剂存在下,使上述主要含有 1,1-二叔烷的馏分与氢气接触;以及 (IV) 将前述氢化步骤(III)中得到的氢化馏分再裂解,回收到上述裂解步骤(I)中。
这种方法特别适用于生产对异丁基苯乙烯,对异丁基苯乙烯是制备布洛芬(一种贵重药品)的起始原料。