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8 条记录 (耗时 0.031 秒)

    Process for the preparation of oxalyl chloride
    1.
    发明授权
    Process for the preparation of oxalyl chloride 失效
    草酰氯的制备方法

    公开(公告)号：US4341720A

    公开(公告)日：1982-07-27

    申请号：US247186

    申请日：1981-03-24

    申请人： Axel Vogel ,  Guido Steffan ,  Karl Mannes ,  Viktor Trescher

    发明人： Axel Vogel ,  Guido Steffan ,  Karl Mannes ,  Viktor Trescher

    IPC分类号： C07C55/36 ,  C07C51/00 ,  C07C51/60 ,  C07C67/00 ,  C07C57/00

    CPC分类号： C07C51/60

    摘要： In a process for the preparation of oxalyl chloride from an oxalic acid compound of the formula ##STR1## wherein R.sup.1 and R.sup.2 are identical or different and represent hydrogen or a lower alkyl radical,and phosphorus pentachloride in the presence of phosphorus oxychloride, the improvement wherein the reaction is carried out in the presence of an amino compound of the formula ##STR2## wherein R.sup.3 represents alkyl, aralkyl, aryl or an acyl group, optionally substituted by amino or carboxamido andR.sup.4 and R.sup.5 are identical or different and represent hydrogen or alkyl, aralkyl, or aryl, optionally substituted by amino or carboxamido, orR.sup.4 and R.sup.5 are linked in an optionally substituted carbocyclic ring with 5 to 7 ring members, which optionally contains nitrogen, sulphur and/or oxygen and is optionally substituted by alkyl, aralkyl, aryl and/or amino groups, andR.sup.3 represents hydrogen or alkyl, which can be linked with R.sup.4 to form a carbocyclic ring, aralkyl or aryl, optionally substituted by an amino or carboxamido group, or optionally forms a double bond in one of the radials R.sup.4 or R.sup.5,and the oxalyl chloride formed is distilled off during the reaction.

    摘要翻译： 在通式“IMAGE”的草酸化合物（其中R 1和R 2相同或不同并且代表氢或低级烷基）和五氯化磷在磷酰氯存在下制备草酰氯的方法中， 该反应在下式的氨基化合物存在下进行：其中R 3表示烷基，芳烷基，芳基或酰基，任选被氨基或甲酰氨基取代，R 4和R 5相同或不同，表示氢或烷基 ，芳烷基或芳基，其任选被氨基或羧酰氨基取代，或R 4和R 5在任选取代的碳环中与5至7个环成员连接，所述环成员任选地含有氮，硫和/或氧并且任选地被烷基，芳烷基 ，芳基和/或氨基，并且R 3表示氢或烷基，其可以与R 4连接形成碳环，芳烷基或芳基，任选被上位体取代 或者在一个径向R4或R5中任选形成双键，并且在反应期间蒸馏形成的草酰氯。

    Process for preparing aromatic hydroxycarboxylic acids
    6.
    发明授权
    Process for preparing aromatic hydroxycarboxylic acids 失效
    制备芳族羟基羧酸的方法

    公开(公告)号：US4529817A

    公开(公告)日：1985-07-16

    申请号：US472470

    申请日：1983-03-07

    申请人： Gerhard Stopp ,  Horst Karkossa ,  Viktor Trescher

    发明人： Gerhard Stopp ,  Horst Karkossa ,  Viktor Trescher

    IPC分类号： C07C51/15

    CPC分类号： C07C51/15

    摘要： Aromatic hydroxycarboxylic acids are prepared by reacting an alkali metal salt of an aromatic hydroxy compound in solid phase with carbon dioxide, by reacting an alkali metal salt of an aromatic hydroxy compound in the form of granules in a fluidized bed with carbon dioxide, if desired under elevated pressure, at first at temperatures of 20.degree. to 130.degree. C. until at least 40% of the hydroxy compound has been converted into the corresponding carbonate, then completing the reaction at temperatures of 135.degree. to 300.degree. C., and then converting the reaction product obtained into the free acid.

    摘要翻译： 芳族羟基羧酸是通过使固体相中的芳族羟基化合物的碱金属盐与二氧化碳反应来制备的，如果需要，在流化床中将颗粒形式的芳族羟基化合物的碱金属盐与二氧化碳反应 升高压力，首先在20°C至130°C的温度下，直到至少40％的羟基化合物已经转化为相应的碳酸盐，然后在135°C至300°C的温度下完成反应，然后转化 得到游离酸的反应产物。

    Process for the preparation of aromatic hydroxycarboxylic acids
    7.
    发明授权
    Process for the preparation of aromatic hydroxycarboxylic acids 失效
    制备芳族羟基羧酸的方法

    公开(公告)号：US4508920A

    公开(公告)日：1985-04-02

    申请号：US472501

    申请日：1983-03-07

    申请人： Gerhard Stopp ,  Horst Karkossa ,  Viktor Trescher

    发明人： Gerhard Stopp ,  Horst Karkossa ,  Viktor Trescher

    IPC分类号： C07C65/03 ,  B01J31/00 ,  C07C51/15

    CPC分类号： C07C51/15

    摘要： Aromatic hydroxycarboxylic acids are prepared by reacting alkali metal salts of aromatic hydroxy compounds in the solid phase with carbon dioxide in a process in which the alkali metal salt of the aromatic hydroxy compound is reacted at temperatures of 120.degree. to 300.degree. C., in the form of granules, in a fluidized bed with carbon dioxide, if appropriate under elevated pressure and, if appropriate, in the presence of the aromatic hydroxy compound in the form of vapor, with continuous removal, by means of excess carbon dioxide, of the aromatic hydroxy compound which is formed, until at least 40% of the hydroxy compound have been converted into the alkali metal salt of the corresponding hydroxycarboxylic acid, and, if appropriate, the resulting alkali metal salt of the hydroxycarboxylic acid is reacted further in a subsequent stage at temperatures of 150.degree. to 300.degree. C. and under elevated pressure, in the presence of carbon dioxide, with the aromatic hydroxy compound formed, and the resulting reaction product is then converted in a customary manner into the free acid.

    摘要翻译： 芳族羟基羧酸通过在固相中的芳族羟基化合物的碱金属盐与二氧化碳反应制备，其中芳族羟基化合物的碱金属盐在120℃至300℃的温度下反应， 如果合适，在升高的压力下，并且如果合适的话，在蒸气形式的芳香族羟基化合物存在下，用二氧化碳的流化床，通过过量二氧化碳连续除去芳族化合物 形成的羟基化合物，直到至少40％的羟基化合物已经转化为相应的羟基羧酸的碱金属盐，并且如果合适，所得羟基羧酸的碱金属盐在后续阶段进一步反应 在150-300℃的温度和升高的压力下，在二氧化碳的存在下，形成芳香族羟基化合物，并且将res 然后将过量的反应产物以常规方式转化成游离酸。