发明名称 |
COLUMNAR CRYSTALS OF 6-HYDROXY-2-NAPHTHOIC ACID AND PROCESS FOR THE PRODUCTION THEREOF |
摘要 |
A process for manufacturing columnar crystals of 6-hydroxy-2-naphthoic acid comprising the steps of, dissolving crude 6-hydroxy-2-naphthoic acid product in an aqueous solvent, adding crystalline 3-hydroxy-2,7-naphthoic acid or columnar crystals as seed crystals, and cooling the mixture to precipitate the desired crystals. The present invention further provides columnar crystals of 6-hydroxy-2-naphthoic acid which have X-ray diffraction peaks 2&thetas; in 16.8-17.8 and/or 21.3-22.3. |
申请公布号 |
EP1123914(B1) |
申请公布日期 |
2007.03.21 |
申请号 |
EP20000953491 |
申请日期 |
2000.08.18 |
申请人 |
UENO FINE CHEMICALS INDUSTRY, LTD. |
发明人 |
UENO, RYUZO;KITAYAMA, MASAYA;KATO, HIROYUKI;OTSUKA, RYOICHI |
分类号 |
C07C51/43;C07C65/11 |
主分类号 |
C07C51/43 |
代理机构 |
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代理人 |
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地址 |
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