Method for purifying crude naphthalenedicarboxylic acid
    23.
    发明授权
    Method for purifying crude naphthalenedicarboxylic acid 失效
    粗萘二甲酸纯化方法

    公开(公告)号:US5872284A

    公开(公告)日:1999-02-16

    申请号:US860622

    申请日:1997-07-09

    CPC分类号: C07C51/487

    摘要: The invention provides a method for purifying a crude naphthalenedicarboxylic acid comprising the steps of mixing a crude naphthalenedicarboxylic acid and a water/alcohol solvent to esterify a part of the naphthalenedicarboxylic acid, thereby dissolving a naphthalenedicarboxylic ester into the solvent, and then contacting the resulting reaction mixture with hydrogen in the presence of a hydrogenation catalyst to hydrogenate impurities which are contained in the crude naphthalenedicarboxylic acid and which are capable of being hydrogenated, thereby dissolving and removing hydrogenation products into the water/alcohol solvent. A mixture of a naphthalene dicarboxylic acid and a naphthalenedicarboxylic ester with reduced impurity contents, or a high-purity naphthalenedicarboxylic acid can be obtained.

    摘要翻译: PCT No.PCT / JP96 / 03180 Sec。 371日期1997年7月9日第 102(e)日期1997年7月9日PCT提交1996年10月30日PCT公布。 第WO97 / 17318号公报 日期:1997年5月15日本发明提供了一种纯化萘二甲酸粗品的方法,包括将粗萘二甲酸与水/醇溶剂混合以使部分萘二甲酸酯化,从而将萘二甲酸酯溶解在溶剂中,然后 使所得反应混合物与氢气在氢化催化剂存在下接触,氢化含有粗萘二甲酸的杂质,并能够被氢化,从而将氢化产物溶解并除去到水/醇溶剂中。 可以获得具有降低的杂质含量的萘二甲酸和萘二甲酸酯的混合物或高纯度萘二甲酸。