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8 条记录 (耗时 0.022 秒)

    Continuous preparation of isatoic anhydride
    4.
    发明授权
    Continuous preparation of isatoic anhydride 失效
    连续制备无水醋酸酐

    公开(公告)号：US4328339A

    公开(公告)日：1982-05-04

    申请号：US209960

    申请日：1980-11-24

    申请人： Gerhard Kilpper ,  Johannes Grimmer ,  Peter Tonne ,  Hans C. Horn ,  Eckhard Hetzel

    发明人： Gerhard Kilpper ,  Johannes Grimmer ,  Peter Tonne ,  Hans C. Horn ,  Eckhard Hetzel

    IPC分类号： C07D265/26

    CPC分类号： C07D265/26

    摘要： A process for the continuous preparation of isatoic anhydrides by two-stage reaction of an alkali metal phthalamate and/or alkali metal phthalimidate with an alkali metal hypohalite, the first stage being carried out substantially adiabatically and both stages being carried out at high flow rates, wherein phthalimide and/or phthalamic acid is first dissolved in a certain amount of an alkali metal hydroxide solution, the resulting solution is mixed with a hypohalite and reacted at a particular temperature, acid is then added and the reaction is completed at a particular temperature. The compounds obtainable by the process of the invention are valuable starting materials for the preparation of dyes, crop protection agents and scents.

    摘要翻译： 通过碱金属酞酸盐和/或碱金属邻苯二甲酰亚胺酸盐与碱金属次卤酸盐的两步反应连续制备酸酐的方法，第一阶段基本上绝热地进行，两个阶段以高流速进行， 其中邻苯二甲酰亚胺和/或邻苯二甲酰氨基酸首先溶解在一定量的碱金属氢氧化物溶液中，将所得溶液与次卤酸盐混合并在特定温度下反应，然后加入酸，并在特定温度下完成反应。 通过本发明的方法可获得的化合物是用于制备染料，作物保护剂和香料的有价值的起始材料。

    Purification of frozen crystal layers
    7.
    发明授权
    Purification of frozen crystal layers 失效
    冷冻晶体层的净化

    公开(公告)号：US4795571A

    公开(公告)日：1989-01-03

    申请号：US154227

    申请日：1988-02-10

    申请人： Bernhard Holzknecht ,  Hugo Fuchs ,  Eckhard Hetzel ,  Klaus Wintermantel ,  Peter Thoma

    发明人： Bernhard Holzknecht ,  Hugo Fuchs ,  Eckhard Hetzel ,  Klaus Wintermantel ,  Peter Thoma

    IPC分类号： B01D9/00 ,  B01D9/02 ,  B01D9/04 ,  C07B63/00 ,  C07C67/00 ,  C07C241/00 ,  C07C265/14 ,  C07D201/16

    CPC分类号： C07D201/16 ,  B01D9/0013

    摘要： Frozen crystal layers are purified by a process in which these crystal layers, after they have been frozen out from a melt or solution on a cooling surface, are brought into contact with a purifying liquid and thus purified over their entire thickness, after which the said layers are separated from the purifying liquid and then melted, wherein the temperature of the crystal layers and of the purifying liquid is close to the melting point or solubility temperature, mass transfer at the phase boundary is intensified by forced convection, and this purification is carried out in the course of from 1 to 60 minutes on layers having a thickness of from 0.2 to 10 mm.

    摘要翻译： 冷冻的晶体层通过这些方法纯化，其中这些晶体层在从冷却表面上的熔体或溶液中冷冻出来之后，与净化液体接触并由此在其整个厚度上净化，之后所述 将层与净化液分离，然后熔融，其中晶体层和净化液的温度接近熔点或溶解温度，通过强制对流加强相边界处的质量传递，并进行该纯化 在厚度为0.2至10mm的层上为1至60分钟的过程。