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13 条记录 (耗时 0.045 秒)

    Preparation of glyoxal
    6.
    发明授权
    Preparation of glyoxal 失效
    乙二醛的制备

    公开(公告)号：US4242282A

    公开(公告)日：1980-12-30

    申请号：US2331

    申请日：1979-01-10

    申请人： Hans Diem ,  Christian Dudeck ,  Gunter Lehmann ,  Guenther Matthias ,  Norbert Petri

    发明人： Hans Diem ,  Christian Dudeck ,  Gunter Lehmann ,  Guenther Matthias ,  Norbert Petri

    IPC分类号： C07C47/127 ,  B01J23/00 ,  C07C45/00 ,  C07C45/38 ,  C07C67/00 ,  C07C45/29

    CPC分类号： C07C45/38

    摘要： Glyoxal is prepared by oxidizing glycol in the presence of a silver catalyst of a defined particle size and under defined conditions of temperature, residence time and inert gas concentration.The glyoxal obtainable by the process of the invention may be used in wrinkle-resist finishing, as an assistant for increasing the tensile strength and resilience of fibrous materials, a tanning agent, a hardener in the photographic industry, and a starting material for the manufacture of synthetic resins, textile auxiliaries, for example to prevent shrinkage after washing, paper additives, for example for increasing the wet strength, and plastics.

    摘要翻译： 乙二醛通过在具有规定粒度的银催化剂存在下和在限定的温度，停留时间和惰性气体浓度条件下氧化二醇来制备。 通过本发明的方法可获得的乙二醛可用于抗皱整理中，作为用于提高纤维材料，鞣制剂，照相工业中的硬化剂的拉伸强度和回弹性的助剂以及用于制造的原料 的合成树脂，纺织助剂，例如用于防止洗涤后的收缩，纸添加剂，例如用于增加湿强度，以及塑料。

    Preparation of formaldehyde
    7.
    发明授权
    Preparation of formaldehyde 失效

    公开(公告)号：US4584412A

    公开(公告)日：1986-04-22

    申请号：US693864

    申请日：1985-01-23

    申请人： Albrecht Aicher ,  Gunter Lehmann ,  Norbert Petri ,  Walter Pitteroff ,  Gunter Reuss ,  Hans Schreiber ,  Robert Sebastian

    发明人： Albrecht Aicher ,  Gunter Lehmann ,  Norbert Petri ,  Walter Pitteroff ,  Gunter Reuss ,  Hans Schreiber ,  Robert Sebastian

    IPC分类号： B01J23/00 ,  B01J23/50 ,  C07B61/00 ,  C07C45/00 ,  C07C45/38 ,  C07C45/78 ,  C07C45/80 ,  C07C45/81 ,  C07C47/055 ,  C07C67/00 ,  C07C45/29

    CPC分类号： C07C45/80 ,  C07C45/38 ,  C07C45/78 ,  C07C45/81

    摘要： Formaldehyde is prepared by (a) passing a mixture of methanol and water with a concentration of between 50 and 90% by weight, based on the total weight of the two substances, of methanol into a packed column which possesses a packing having a total layer thickness of not less than 50 cm and a total surface area of not less than 0.5 cm.sup.2 per cm.sup.3 of packing, a liquid circulation of from 15 to 90 g/min per g/min of methanol fed to the column, and a concentration of from 10 to 45% by weight of methanol in the recycle liquid, the temperature at the point of entry of the recycle liquid in the column being from 50.degree. to 86.degree. C. and the bottom temperature being 10.degree.-25.degree. C. lower than this, i.e. from 40.degree. to 70.degree. C., (b) separating off methanol and water from the column by stripping with air, an inert gas and/or exit gas, the throughput being from 0.5 to 3 tonnes of methanol and water per hour per m.sup.2 of column cross-section, (c) converting the gaseous mixture of methanol, water, air, inert gas and/or exit gas at a space velocity of from 0.5 to 3 tonnes of methanol per m.sup.2 of catalyst bed cross-section per hour, in the presence of a silver catalyst at from 550.degree. to 750.degree. C. and (d) finally, cooling and absorbing the hot reaction gases, and using the resulting heat of absorption and, if desired, the heat of reaction and/or the heat of condensation partially or completely for heating the recycle liquid, methanol containing impurities being used if desired and, after the stages (a) and (b) and before the stages (c) and (d), the measures of a stage (e) being carried out, wherein the gaseous mixture formed is passed through two layers of wire filter having a wire diameter of from 0.1 to 0.5 mm and a free layer volume of from 90 to 99.5 vol. %, based on the total volume of one wire layer, at a flow rate of from 7 to 13 m/sec in the first layer, and from 1 to 4 m/sec in the second layer.The formaldehyde obtainable by the process of the invention is a disinfectant, tanning agent, reducing agent and a useful starting material for the preparation of synthetic resins, adhesives and plastics.