公开(公告)号：US20180134676A1

公开(公告)日：2018-05-17

申请号：US15570167

申请日：2016-04-19

申请人： Robert JAHN ,  Wolfgang WÖLL ,  Bernd JAEGER ,  Matthias PASCALY

发明人： Robert JAHN ,  Wolfgang WÖLL ,  Bernd JAEGER ,  Matthias PASCALY

IPC分类号： C07D301/12 ,  C07D301/36 ,  C07D303/04 ,  B01J29/89 ,  B01D3/34 ,  B01D3/42 ,  B01D19/04

CPC分类号： C07D301/12 ,  B01D3/34 ,  B01D3/4294 ,  B01D19/0409 ,  B01J29/89 ,  C07D301/36 ,  C07D303/04

摘要： In a process for the epoxidation of propene, comprising the steps: reacting propene with hydrogen peroxide in the presence of a titanium silicalite catalyst and a methanol solvent; separating non-reacted propene and propene oxide from the resulting reaction mixture to provide a solvent mixture comprising methanol and water in a combined amount of at least 90% by weight; and feeding this solvent mixture as a feed stream to a continuously operated methanol distillation column at a feed point in the middle section of said column to provide an overhead product comprising at least 90% by weight methanol and a bottoms product comprising at least 90% by weight water; the addition of a liquid defoamer, having a solubility in the feed stream of less than 10 mg/kg at 25° C. and a surface tension at the liquid air interface of less than 22 mN/m at 20° C., at or above the feed point in an amount exceeding the solubility of the liquid defoamer in the feed stream suppresses foam formation in the methanol distillation column.