Process for crystallizing trimellitic acid
    2.
    发明授权
    Process for crystallizing trimellitic acid 失效
    结晶偏苯三酸的方法

    公开(公告)号:US4490554A

    公开(公告)日:1984-12-25

    申请号:US454595

    申请日:1982-12-30

    CPC分类号: C07C51/43

    摘要: In crystallizing and separating trimellitic acid obtained by the oxidation of dimethylbenzaldehyde or its oxidation derivative with a molecular oxygen-containing gas in an aqueous solvent in the presence of a bromine ion or a bromine ion and a heavy metallic ion catalyst, a process for crystallizing trimellitic acid wherein the crystallization is carried out with at least two crystallization vessels connected in series, of which the first vessel is kept at a temperature of 40.degree. to 130.degree. C. and at a concentration of trimellitic acid of 20 to 60 wt. %.

    摘要翻译: 在溴离子或溴离子和重金属离子催化剂存在下,通过在含水溶剂中的含氧气体氧化二甲基苯甲醛或其氧化衍生物得到的偏苯三酸结晶和分离, 酸,其中结晶通过串联连接的至少两个结晶容器进行结晶,其中第一容器保持在40至130℃的温度和偏苯三酸浓度为20至60wt。 %。