- 专利标题： A PROCESS FOR PURIFYING 4,4'-DICHLORODIPHENYL SULFONE
-
申请号： PCT/EP2020/073375申请日： 2020-08-20
-
公开(公告)号： WO2021037683A1公开(公告)日： 2021-03-04
- 发明人: HAMANN, Jessica Nadine , BEY, Oliver , DECKERT, Petra , MELZER, Andreas , SCHUETZ, Christian , BLEI, Stefan , THRUN, Frauke
- 申请人： BASF SE
- 申请人地址： Carl-Bosch-Str. 38
- 专利权人： BASF SE
- 当前专利权人： BASF SE
- 当前专利权人地址： Carl-Bosch-Str. 38
- 代理机构： KUDLA, Karsten
- 优先权： EP19193677.2 2019-08-27
- 主分类号： C07C315/06
- IPC分类号： C07C315/06 ; C07C317/04
摘要：
The invention relates to a process for purifying 4,4'-dichlorodiphenyl sulfone comprising: (a) providing a suspension comprising particulate 4,4'-dichlorodiphenyl sulfone in carboxylic acid, (b) carrying out a solid-liquid separation of the suspension to obtain residual moisture containing 4,4'-dichlorodiphenyl sulfone and a carboxylic acid comprising filtrate, (c) washing the residual moisture containing 4,4'-dichlorodiphenyl sulfone with an aqueous base and then with water, (d) mixing the aqueous base after being used for washing with a strong acid, or mixing the aqueous base after being used for washing, the carboxylic acid comprising filtrate and a strong acid, (e) carrying out a phase separation in which an aqueous phase and an organic phase comprising the carboxylic acid are obtained.
