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    • 4. 发明授权
    • Process for preparing high purity terephthalic acid
    • 制备高纯对苯二甲酸的方法
    • US3887612A
    • 1975-06-03
    • US24771172
    • 1972-04-26
    • MARUZEN OIL CO LTD
    • SHIGEYASU MOTOOKUIHARA KENZO
    • C07C51/265C07C51/42C07C63/26
    • C07C51/265C07C51/42C07C63/26
    • A process for preparing terephthalic acid of high purity which comprises oxidizing para-xylene in the liquid phase with molecular oxygen or a gas containing molecular oxygen in the presence of a lower aliphatic carboxylic acid as a solvent and an oxidation catalyst, subjecting the resultant oxidation reaction product to solid-liquid separation, feeding the resultant terephthalic acid into a slurrying tank, adding a fresh supply of solvent and slurrying the terephthalic acid there, stirring the resulting slurry by continuously withdrawing a part of it from the slurrying tank and returning it into the slurry portion in said tank through a circulating pump located outside the tank and subsequently feeding the slurry into a immersion tank to immerse it at elevated temperatures, followed by solid-liquid separation.
    • 一种高纯度对苯二甲酸的制备方法,其包括在低级脂族羧酸作为溶剂和氧化催化剂存在下,用分子氧或含分子氧的气体氧化液相中的对二甲苯,进行所得的氧化反应 产物进行固液分离,将得到的对苯二甲酸进料到制浆槽中,加入新鲜的溶剂并在其中使对苯二甲酸浆化,通过从制浆罐中连续取出一部分并将其返回到 通过位于罐外部的循环泵将所述罐中的浆料部分,并随后将浆料送入浸渍池中以在升高的温度下浸渍,然后进行固液分离。