发明名称 |
PROCESS FOR PRODUCING DIHYDROXYDIPHENYL SULFONE |
摘要 |
<p>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.</p> |
申请公布号 |
EP1498412(A1) |
申请公布日期 |
2005.01.19 |
申请号 |
EP20030725653 |
申请日期 |
2003.04.24 |
申请人 |
KONISHI CHEMICAL IND. CO., LTD. |
发明人 |
OI, FUMIO;YANASE, NORIO;KITAHARA, TAKAYUKI;NATE, NOBUYUKI |
分类号 |
C07C315/06;C07C317/22;(IPC1-7):C07C315/06 |
主分类号 |
C07C315/06 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|