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    • 48. 发明授权
    • Method for preparing 2,6-naphthalene dicarboxylic acid
    • 2,6-萘二甲酸的制备方法
    • US07355071B2
    • 2008-04-08
    • US11090054
    • 2005-03-28
    • Masaya KitayamaHiroyuki Wakamori
    • Masaya KitayamaHiroyuki Wakamori
    • C07C51/42
    • C07C51/09C07C63/38
    • Disclosed is an improved method for preparing 2,6-naphthalene dicarboxylic acid from di-lower alkyl 2,6-naphthalene dicarboxylate, which is characterized in that hydrolyzing di-lower alkyl 2,6-naphthalene dicarboxylate in a specified amount of water in the presence of specified amount of hydrophobic organic solvent and an additive; that hydrolyzing di-lower alkyl 2,6-naphthalene dicarboxylate in a specific amount of a mixed solvent of non-water miscible alcohol and water; or in that di-lower alkyl 2,6-naphthalene dicarboxylate is hydrolyzed in two steps wherein the 1st step comprises hydrolyzing said ester in a water miscible organic solvent in the presence of a small amount of water, and the 2nd step comprises further hydrolyzing the reaction.
    • 本发明公开了一种从2,6-二萘基二羧酸二低级烷基酯制备2,6-萘二羧酸的改进方法,其特征在于将2,6-萘二羧酸二低级烷基酯在规定量的水中 存在规定量的疏水性有机溶剂和添加剂; 在特定量的非水混溶性醇和水的混合溶剂中水解2,6-萘二甲酸二低级烷基酯; 或者在2,6-二羧酸二低级烷基酯中以两个步骤水解,其中第一步包括在少量水存在下在水混溶性有机溶剂中水解所述酯,第二步包括进一步水解 反应。