发明名称 |
Crystal of p-hydroxybenzoic anhydride and process for producing the same |
摘要 |
The present invention provides a process for preparing crystalline parahydroxybenzoic acid anhydride, comprising the step of precipitating and isolating parahydroxybenzoic acid in an aqueous solvent at a temperature equal to or above the transition temperature of parahydroxybenzoic acid.
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申请公布号 |
US2006264670(A1) |
申请公布日期 |
2006.11.23 |
申请号 |
US20050553451 |
申请日期 |
2005.10.17 |
申请人 |
UENO RYUZO;KITAYAMA MASAYA;IZUMICHI NOBUTAKA;KITTAKA MASAHARU |
发明人 |
UENO RYUZO;KITAYAMA MASAYA;IZUMICHI NOBUTAKA;KITTAKA MASAHARU |
分类号 |
C07C51/56;C07C51/43 |
主分类号 |
C07C51/56 |
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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