发明授权
- 专利标题： Process for the production of high-purity naphthalenedicarboxylic acid
- 专利标题（中）： 生产高纯萘二甲酸的方法
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申请号： US943718申请日： 1997-10-03
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公开(公告)号： US5859294A公开(公告)日： 1999-01-12
- 发明人: Akio Hashimoto , Ryusuke Shigematsu , Kenichi Nakamura , Makoto Takagawa
- 申请人： Akio Hashimoto , Ryusuke Shigematsu , Kenichi Nakamura , Makoto Takagawa
- 申请人地址： JPX Tokyo
- 专利权人： Mitsubishi Gas Chemical Corporation, Inc.
- 当前专利权人： Mitsubishi Gas Chemical Corporation, Inc.
- 当前专利权人地址： JPX Tokyo
- 优先权： JPX8-18962 19960205; JPX8-18963 19960205; JPX8-141687 19960604
- 主分类号： C07C51/43
- IPC分类号： C07C51/43 ; C07C51/487 ; C07C51/42
摘要：
A process for producing a high-purity naphthalenedicarboxylic acid having an improved hue or an excellent hue from a crude naphthalenedicarboxylic acid obtained by the oxidation of dialkyl naphthalene, industrially advantageously at high yields, which comprises dissolving a crude naphthalenedicarboxylic acid obtained by the oxidation of dialkyl naphthalene in an aqueous solution containing an aliphatic amine, an alicyclic amine or acetonitrile, removing heavy metal components contained as impurities until the content of the heavy metal components based on the crude naphthalenedicarboxylic acid is 100 ppm or less, and heating the aqueous solution containing a naphthalenedicarboxylic acid amine salt to distill off the amine.
公开/授权文献
- US4739756A Endotracheal tube 公开/授权日：1988-04-26