发明名称 |
Process for producing high-purity 4,4'-dihydroxydiphenyl sulfone |
摘要 |
The present invention provides a process for producing 4,4'-dihydroxydiphenylsulfone of very high purity. In particular, the present invention provides a process for producing 4,4'-dihydroxydiphenylsulfone of high purity comprising the steps of subjecting phenol in combination with a sulfonating agent or phenolsulfonic acid to a dehydration reaction in the presence of an aromatic nonpolar solvent while suspending the resulting dihydroxydiphenylsulfone therein, mixing the reaction suspension with a polar solvent to at least partially dissolve the dihydroxydiphenylsulfone, and precipitating 4,4'-dihydroxydiphenylsulfone.
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申请公布号 |
US2005272956(A1) |
申请公布日期 |
2005.12.08 |
申请号 |
US20050529074 |
申请日期 |
2005.03.24 |
申请人 |
OGATA EIJI;OI FUMIO;YANASE NORIO;NATE NOBUYUKI |
发明人 |
OGATA EIJI;OI FUMIO;YANASE NORIO;NATE NOBUYUKI |
分类号 |
C07C315/00;C07C315/06;C07C317/22;(IPC1-7):C07C315/00 |
主分类号 |
C07C315/00 |
代理机构 |
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地址 |
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