公开(公告)号：US4256909A

公开(公告)日：1981-03-17

申请号：US66552

申请日：1979-08-15

申请人： Rudolf Kummer ,  Heinz-Walter Schneider ,  Franz-Josef Weiss ,  Otto Lemann

发明人： Rudolf Kummer ,  Heinz-Walter Schneider ,  Franz-Josef Weiss ,  Otto Lemann

IPC分类号： C07C69/44 ,  B01J31/00 ,  C07B61/00 ,  C07C67/38 ,  C07C69/34

CPC分类号： C07C69/34 ,  C07C67/38

摘要： In a process for the preparation of dimethyl butanedicarboxylates, wherein(a) butadiene or a hydrocarbon mixture containing butadiene is reacted with carbon monoxide and methanol in the presence of a tertiary nitrogen base and a cobalt carbonyl catalyst at from 80.degree. to 150.degree. C. under superatmospheric pressure,(b) the greater part of the tertiary nitrogen base and any excess hydrocarbons are removed and(c) the methyl pentenoate thus obtained is reacted with carbon monoxide and methanol, in the presence of a cobalt carbonyl catalyst and the residual amount of tertiary nitrogen base, at from 140.degree. to 200.degree. C. under superatmospheric pressure, to give the dimethyl butanedicarboxylate, the improvement that the reaction mixture obtained in stage (a) after reaction of the butadiene is cooled until it separates into two phases, and a part-stream of from 20 to 80% by volume of the lower phase is recycled to stage (a).

摘要翻译： 在制备丁二酸二甲酯的方法中，其中（a）丁二烯或含有丁二烯的烃混合物在叔氮碱和羰基钴催化剂存在下在80-150℃下与一氧化碳和甲醇反应。 在超大气压下，（b）除去大部分叔氮碱和任何过量的烃，并且（c）由此获得的戊烯酸甲酯在羰基钴催化剂存在下与一氧化碳和甲醇反应，剩余量 的叔氮碱，在超大气压下，在140〜200℃下，得到丁二酸二甲酯，改善在丁二烯反应后阶段（a）中得到的反应混合物冷却至分离为两相， 并且将下层相的20〜80体积％的一部分流循环至（a）阶段。