发明名称 |
Process for producing dihydroxydiphenylsulfone |
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.
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申请公布号 |
US6974886(B2) |
申请公布日期 |
2005.12.13 |
申请号 |
US20040511823 |
申请日期 |
2004.10.19 |
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):C07C317/33 |
主分类号 |
C07C315/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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