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    METHOD FOR OXIDIZING A 1,1,-BIS-(3,4-DIMETHYLPHENYL)-ALKANE TO 3,3',4,4'-BENZOPHENONE TETRACARBOXYLIC ACID
    1.
    发明申请
    METHOD FOR OXIDIZING A 1,1,-BIS-(3,4-DIMETHYLPHENYL)-ALKANE TO 3,3',4,4'-BENZOPHENONE TETRACARBOXYLIC ACID 有权

    公开(公告)号：US20210179527A1

    公开(公告)日：2021-06-17

    申请号：US17123004

    申请日：2020-12-15

    申请人： Evonik Fibres GmbH

    发明人： Harald RÖGL

    IPC分类号： C07C51/275 ,  C07C51/43 ,  C01B21/40 ,  B01J3/02 ,  B01J19/00

    摘要： In a method for oxidizing 1,1-bis-(3,4-dimethylphenyl)-alkane with nitric acid in a pressure vessel to produce 3,3′,4,4′-benzophenone tetracarboxylic acid with concurrent formation of nitric oxide, passing nitric oxide from the pressure vessel into an absorption vessel and reacting nitric oxide in the absorption vessel with molecular oxygen and water to produce an aqueous nitric acid solution prevents discharge of nitric oxide, avoids the risk of oxygen inhibiting the nitric acid oxidation and reduces nitric acid consumption when the nitric acid from the absorption vessel is used for oxidizing the 1,1-bis-(3,4-dimethylphenyl)-alkane.

    Process for preparing organic acids
    2.
    发明授权
    Process for preparing organic acids 失效
    制备有机酸的方法

    公开(公告)号：US4384134A

    公开(公告)日：1983-05-17

    申请号：US290662

    申请日：1981-08-06

    申请人： Johann G. Schulz ,  Daniel Margosian

    发明人： Johann G. Schulz ,  Daniel Margosian

    IPC分类号： C07C51/27 ,  C07C51/275

    CPC分类号： C07C51/27

    摘要： A process for preparing a coal derivative comprising a mixture of monocyclic, polycyclic, multifunctional carboxylic acids which comprises contacting an aqueous slurry containing coal with aqueous nitric acid and then drying the resulting product to remove water therefrom.

    摘要翻译： 一种制备包含单环，多环，多官能羧酸的混合物的煤衍生物的方法，其包括使含有煤的含水浆料与硝酸水溶液接触，然后干燥所得产物以从其中除去水。