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    • 32. 发明授权
    • Method for making high-purity naphthalenedicarboxylic acid
    • 制备高纯度萘二羧酸的方法
    • US06717009B2
    • 2004-04-06
    • US10265401
    • 2002-10-07
    • Masahiro MotoyukiTomoki UemuraKoji Yamamoto
    • Masahiro MotoyukiTomoki UemuraKoji Yamamoto
    • C07C5142
    • C07C51/487C07C51/265C07C51/43C07C51/47C07C63/26C07C63/38
    • A high-purity naphthalenedicarboxylic acid is produced by a method including Steps [1] and [2]: In Step [I], a raw mixture of crude terephthalic acid and crude naphthalenedicarboxylic acid is dissolved into high-temperature high-pressure water to form a dibasic acid solution wherein the crude naphthalenedicarboxylic acid content is 0.1 to 10 mass percent of the crude terephthalic acid content, the dibasic acid solution is brought into contact with hydrogen in the presence of a catalyst. In Step [II], the resultant in the dibasic acid solution is crystallized by multiple stages while the temperature and the pressure are reduced for each stage, and acid mixtures containing enriched naphthalenedicarboxylic acid or enriched terephthalic acid are obtained by solid-liquid separation.
    • 通过包括步骤[1]和[2]的方法制备高纯度萘二羧酸:在步骤[I]中,将粗对苯二甲酸和粗萘二甲酸的粗混合物溶解在高温高压水中形成 二萘酸溶液,其中粗萘二羧酸含量为粗对苯二甲酸含量的0.1〜10质量%,二元酸溶液在催化剂存在下与氢接触。 在步骤[II]中,将二元酸溶液中的所得物在多个阶段中结晶,同时每个阶段降低温度和压力,通过固液分离获得含有富含萘二甲酸或富对苯二甲酸的酸混合物。