公开(公告)号：GB1140131A

公开(公告)日：1969-01-15

申请号：GB2206366

申请日：1966-05-18

Applicant: BASF AG

Inventor： WEITZ HANS-MARTIN ,  MERGER FRANZ ,  KOOPMAN JUERGEN

IPC: B01J19/00 ,  C01B7/09 ,  C25B1/24

Abstract: 1,140,131. 1,4 - Dicyanobutene - (2). BADISCHE ANILIN- & SODA-FABRIK A.G. 18 May, 1966 [19 May, 1965], No. 22063/66. Heading C2C. [Also in Division C1] 1,4 - Dicyanobutene - (2) is obtained by reacting at an elevated temperature 1,2- dibromobutene-(3) and/or 1,4-dibromobutene- (2) with at least the stoichiometric amount of HCN in the presence of a copper salt in an aqueous acid medium at a pH of - 1 to + 3 using a buffer substance which exhibits buffering action in the said pH range as an acid acceptor, the acid acceptor being present in an amount of at least 1 equivalent per mole of dibromobutene, separating the resultant 1,4-dicyanobutene-(2) from the reaction mixture, oxidizing the HBr present in the aqueous solution to elementary Br 2 , separating Br 2 and returning the aqueous solution containing the acid acceptor to the reaction. The reaction may be carried out continuously or batchwise. The acid acceptors specified are alkali metal salts or alkaline earth salts of medium strength acids. The reaction solution may contain catalysts for the reoxidation of the bromine anions. Examples are given for the production of 1,4- dicyanobutene-(2) and an apparatus is described which is suitable for carrying out the continuous process.