发明授权
- 专利标题： Process for producing dihydroxydiphenylsulfone
- 专利标题（中）： 制备二羟基二苯砜的方法
-
申请号： US10511823申请日： 2003-04-24
-
公开(公告)号： US06974886B2公开(公告)日： 2005-12-13
- 发明人: Fumio Oi , Norio Yanase , Takayuki Kitahara , Nobuyuki Nate
- 申请人： Fumio Oi , Norio Yanase , Takayuki Kitahara , Nobuyuki Nate
- 申请人地址： JP Wakayama
- 专利权人： Konishi Chemical Ind. Co., Ltd.
- 当前专利权人： Konishi Chemical Ind. Co., Ltd.
- 当前专利权人地址： JP Wakayama
- 代理机构： Knobbe, Martens, Olson & Bear LLP
- 优先权： JP2002-123646 20020425
- 国际申请： PCT/JP03/05228 WO 20030424
- 国际公布： WO03/091206 WO 20031106
- 主分类号： C07C315/06
- IPC分类号： C07C315/06 ; C07C317/22 ; C07C317/33
摘要：
The present invention provides a process for producing dihydroxydiphenylsulfone wherein trihydroxytriphenylsulfone and coloring impurities are effectively removed without altering the isomeric composition of dihydroxydiphenylsulfone. In particular, the present invention provides a process for producing dihydroxydiphenylsulfone comprising the steps of dissolveing or suspending in an aqueous solvent crude dihydroxydiphenylsulfone containing trihydroxytriphenylsulfone, adjusting the pH to 5–7, optionally cooling, and separating the crystalline dihydroxydiphenylsulfone thus precipitated.
公开/授权文献
- US20050171384A1 Process for producing dihydroxydiphenyl sulfone 公开/授权日：2005-08-04
信息查询
