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    Process for producing terephthalic acid of high purity
    2.
    发明授权
    Process for producing terephthalic acid of high purity 失效
    制备高纯度对苯二甲酸的方法

    公开(公告)号：US4268690A

    公开(公告)日：1981-05-19

    申请号：US55198

    申请日：1979-07-02

    Applicant: Makoto Komatsu ,  Tazuo Ohta ,  Toru Tanaka ,  Ryoichi Oda ,  Yuji Takamizawa

    Inventor： Makoto Komatsu ,  Tazuo Ohta ,  Toru Tanaka ,  Ryoichi Oda ,  Yuji Takamizawa

    IPC: C07C51/47 ,  B01D9/02 ,  C07C51/00 ,  C07C51/255 ,  C07C51/43 ,  C07C63/26 ,  C07C67/00 ,  C07C51/16 ,  C07C51/42

    CPC classification number: C07C51/255 ,  C07C51/43 ,  Y02P20/52

    Abstract: Terephthalic acid of high purity is continuously produced in a high yield by oxidizing p-tolualdehyde with a molecular oxygen-containing gas in the presence of bromine ions as a catalyst in a water solvent, contacting the resulting slurry solution containing crude terephthalic acid with an ascending stream of high temperature water of 180.degree.-320.degree. C., and withdrawing the water solvent together with the ascending stream of high temperature of water upwardly, while settling down crystalline terephthalic acid through the ascending stream of high temperature water and withdrawing the crystalline terephthalic acid together with a portion of the high temperature water downwardly.

    Abstract translation: 在水溶剂中，在溴离子作为催化剂存在下，用含分子氧的气体氧化对甲苯甲醛，从而以高收率连续生产高纯度的对苯二甲酸，使含有粗对苯二甲酸的浆液与上升 180℃-320℃的高温水流，并将水溶剂与上升水的上升水一起向上取出，同时通过高温水的上升下降结晶对苯二甲酸，并将结晶对苯二甲酸 酸与一部分高温水一起向下。

    Process for preventing blackening of phthalic acid
    3.
    发明授权
    Process for preventing blackening of phthalic acid 失效
    防止苯二甲酸黑化的方法

    公开(公告)号：US4214100A

    公开(公告)日：1980-07-22

    申请号：US857709

    申请日：1977-12-05

    Applicant: Makoto Komatsu ,  Tazuo Ohta ,  Toru Tanaka ,  Kimiko Akagi

    Inventor： Makoto Komatsu ,  Tazuo Ohta ,  Toru Tanaka ,  Kimiko Akagi

    IPC: C07C63/15 ,  C07C51/00 ,  C07C51/265 ,  C07C63/26 ,  C07C67/00 ,  C07C51/33

    CPC classification number: C07C51/265

    Abstract: In the production of phthalic acid by oxidizing, in a liquid phase, tolualdehyde with molecular oxygen or a gas containing the molecular oxygen in the presence of heavy metal salt containing a Mn salt, especially both Mn and Co salts, and a bromine compound, using a lower aliphatic monocarboxylic acid as a reaction solvent, a blackening of phthalic acid is effectively prevented by conducting the oxidation of tolualdehyde in the presence of an alkylbenzene in an amount satisfying the following formula (1);M.ltoreq.-0.15A.sup.2 +15A+40 (1)wherein M is a Mn atom concentration in.ppm by weight on the basis of the reaction solution, and A is an amount in % by weight of the alkylbenzene added on the basis of the total of tolualdehyde and said alkylbenzene, and is in a range of from more than 0 to 50 inclusive.

    Abstract translation: 在通过在含有Mn盐，特别是Mn和Co盐以及溴化合物的重金属盐存在下，用分子氧或含有分子氧的气体在液相中氧化甲苯甲醛来生产邻苯二甲酸，使用 作为反应溶剂的低级脂族一元羧酸，通过在满足下式（1）的量的烷基苯存在下进行甲苯甲醛的氧化有效地防止了邻苯二甲酸的黑化; M = 0.15A2 + 15A + 40（1）其中M是以反应溶液为基准的Mn原子浓度为ppm重量ppm，A为基于添加量的烷基苯的重量％ 的甲苯甲醛和所述烷基苯的总量，并且在大于0至50的范围内。

    Process for producing high purity isophthalic acid
    4.
    发明授权
    Process for producing high purity isophthalic acid 失效
    生产高纯度异丙酸的方法

    公开(公告)号：US5132450A

    公开(公告)日：1992-07-21

    申请号：US722555

    申请日：1991-06-25

    Applicant: Kazuo Tanaka ,  Terumasa Yoshida ,  Fumio Okoshi ,  Ichihei Motoyama ,  Tazuo Ohta ,  Toshiaki Abe

    Inventor： Kazuo Tanaka ,  Terumasa Yoshida ,  Fumio Okoshi ,  Ichihei Motoyama ,  Tazuo Ohta ,  Toshiaki Abe

    IPC: B01J27/128 ,  C07C51/265

    CPC classification number: B01J27/128 ,  C07C51/265

    Abstract: A process for producing isophthalic acid by oxidation of m-xylene with an oxygen-containing gas in a hydrous acetic acid solvent in the presence of a cobalt/manganese/bromine system catalyst, the process being capable of industrially advantageously producing high-purity isophthalic acid having excellent whiteness, the process comprising (1) a step of carrying out an oxidation reaction in a main oxidation reactor under specified ranges of a catalyst concentration, a reaction temperature and an oxygen concentration in a discharge gas such that the concentration of 3-carboxybenzaldehyde becomes 500 to 10,000 ppm, (2) a step of further carrying out an oxidation reaction in a post oxidation reactor such that the concentration of 3-carboxybenzaldehyde becomes 100 to 800 ppm, separating crude isophthalic acid, evaporating remaining mother liquor and recovering acetic acid, and (3) mixing the crude isophthalic acid with purified acetic acid, stirring the resultant mixture at 100.degree. C. or higher, and separating purified isophthalic acid.

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