发明名称 |
Method of preparing high purity 2,6-naphthalene dicarboxylic acid. |
摘要 |
<p>The present invention provides a method of preparing high purity 2,6-naphthalene dicarboxylic acid in which the contents of coloring substances, heavy metal and bromine compounds can be reduced by dissolving coarse crystals of 2,6-naphthalene dicarboxylic acid containing impurities in supercritical or subcritical water containing an entrainer composed of an organic solvent containing oxygen and having a specific solubility parameter, and by cooling an obtained solution to cause crystals to precipitate so as to separate the crystals from mother liquor.</p> |
申请公布号 |
EP0672644(A1) |
申请公布日期 |
1995.09.20 |
申请号 |
EP19940120972 |
申请日期 |
1994.12.30 |
申请人 |
MITSUBISHI CHEMICAL CORPORATION |
发明人 |
FUKUI, YOSHIO;YOSHIOKA, TATSUTO;SUGIMOTO, CHIKARA;OKUYAMA, MANABU;MINE, NORIOKI;YAMAGISHI, MASAHIKO |
分类号 |
C07C51/43;(IPC1-7):C07C51/43;C07C63/38 |
主分类号 |
C07C51/43 |
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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