发明授权
- 专利标题： Isolation of 4,4'-dichlorodiphenyl sulfone
- 专利标题（中）： 4,4'-二氯二苯砜的分离
-
申请号： US148386申请日： 1988-01-25
-
公开(公告)号： US4873372A公开(公告)日： 1989-10-10
- 发明人: Gerhard Schaefer , Heinz Eilingsfeld , Peter Neumann , Michael Stumpp
- 申请人： Gerhard Schaefer , Heinz Eilingsfeld , Peter Neumann , Michael Stumpp
- 申请人地址： DEX Ludwigshafen
- 专利权人： BASF Aktiengesellschaft
- 当前专利权人： BASF Aktiengesellschaft
- 当前专利权人地址： DEX Ludwigshafen
- 主分类号： C07C315/06
- IPC分类号： C07C315/06 ; C07C317/14
摘要：
A process for the isolation of 4,4'-dichlorodiphenyl sulfone from a mixture of dichlorodiphenyl sulfones in which the ratios of the masses of 2,4'-dichlorodiphenyl sulfone and 3,4'-dichlorodiphenyl sulfone to the mass of 4,4'-dichlorodiphenyl sulfone are respectively from 0.5% to 20% and from 0.5% to 30% by treating the mixture with an alkanol at temperatures of from 20.degree. C. to 250.degree. C., cooling, and separating the pure 4,4'-dichlorodiphenyl sulfone that precipitates.