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    Manufacture of acrylic acid by oxidation of propylene with oxygen-containing gases in two separate catalyst stages
    4.
    发明授权
    Manufacture of acrylic acid by oxidation of propylene with oxygen-containing gases in two separate catalyst stages 失效
    通过在两个独立的催化剂阶段用含氧气体氧化丙烯来制造丙烯酸

    公开(公告)号：US4031135A

    公开(公告)日：1977-06-21

    申请号：US595321

    申请日：1975-07-11

    申请人： Heinz Engelbach ,  Richard Krabetz ,  Gerd Duembgen ,  Carl-Heinz Willersinn ,  Ulrich Lebert ,  Fritz Thiessen

    发明人： Heinz Engelbach ,  Richard Krabetz ,  Gerd Duembgen ,  Carl-Heinz Willersinn ,  Ulrich Lebert ,  Fritz Thiessen

    IPC分类号： C07C57/05 ,  C07C45/35 ,  C07C51/00 ,  C07C51/25 ,  C07C57/055 ,  C07C67/00 ,  C07C51/32

    CPC分类号： C07C45/35 ,  C07C51/252

    摘要： In the oxidation of propylene to acrylic acid in the gas phase in two spatially separate oxidation stages, a part of the off-gas, which has been freed from condensable products, is fed to the oxidation stages in addition to freshly charged propylene and air, under the following conditions:A. The recycled off-gas and air are in part fed to the first oxidation stage and in part to the second oxidation stage,B. The molar ratio of propylene : oxygen : residual gases fed to the first stage is 1 : 1.5-2.3 : 11-19,C. The molar ratio of the total propylene fed in, to the total oxygen fed in, in the form of air or off-gas, before and after the first stage, and to the total residual gases fed in is 1 : 1.9-2.5 : 13-25, with the proviso thatD. The air and the recycled off-gas are divided between the two feed points in such a way that from 10 to 50% by volume of the total quantity of air and off-gas fed in are added after the first stage andE. The air and off-gas are admixed to the reaction gas mixture after the first stage, immediately after it leaves the catalyst zone, so that the mixture is rapidly cooled to a temperature of from 150.degree. to 320.degree. C.

    摘要翻译： 在两个空间分离的氧化阶段中，在气相中将丙烯氧化成丙烯酸，除了新鲜电荷的丙烯和空气之外，将一部分已经脱除可冷凝产物的废气进料到氧化阶段， 在以下条件下：

    Preparation of .alpha.,.beta.-olefinically unsaturated aldehydes of 3 or 4 carbon atoms
    6.
    发明授权
    Preparation of .alpha.,.beta.-olefinically unsaturated aldehydes of 3 or 4 carbon atoms 失效
    制备3或4个碳原子的α，β-烯属不饱和醛

    公开(公告)号：US4298763A

    公开(公告)日：1981-11-03

    申请号：US126896

    申请日：1980-03-03

    申请人： Heinz Engelbach ,  Richard Krabetz ,  Gerd Duembgen ,  Carl-Heinz Willersinn ,  Walter Beitelschmidt

    发明人： Heinz Engelbach ,  Richard Krabetz ,  Gerd Duembgen ,  Carl-Heinz Willersinn ,  Walter Beitelschmidt

    IPC分类号： B01J23/88 ,  B01J23/887 ,  B01J23/888 ,  B01J27/186 ,  B01J37/02 ,  C07C45/35 ,  C07C47/22

    CPC分类号： B01J23/8878 ,  B01J23/8876 ,  B01J23/8877 ,  B01J23/8885 ,  B01J27/186 ,  B01J37/0221 ,  C07C45/35 ,  B01J2523/00 ,  Y10T16/546

    摘要： Acrolein and methacrolein are prepared advantageously by oxidizing propylene or isobutylene, respectively, with an oxygen-containing gas mixture under conventional conditions over a supported catalyst possessing a firmly adhering coating, from 150 to 1,500 .mu.m thick, which contains calcined catalytic material based on molybdenum oxide and has a carrier core with a surface area of less than 15 m.sup.2 /g and a diameter of more than 100 .mu.m, if a coated catalyst is used which has been prepared by applying calcined catalytic material having a particle size of from 0.1 to 300 .mu.m, in an amount of from 1 to 40 g/min/liter of carrier and water in a weight ratio of catalytic material to water of from 1:1 to 8:1, continuously and separately from one another, each at a constant speed, at below 100.degree. C. to vigorously agitated carrier particles which may or may not have been premoistened with water in an amount of up to 95% of the water absorbency of the particles, the prepartion of the catalyst being carried out in such a way that the water content of the coating which forms is less than the maximum degree of saturation of the catalytic material.

    摘要翻译： 丙烯醛和甲基丙烯醛有利地通过在常规条件下用含氧气体混合物在含有150至1,500μm厚的牢固粘附的涂层的负载型催化剂上氧化丙烯或异丁烯，其包含基于钼的煅烧催化材料 并且具有表面积小于15m 2 / g并且直径大于100μm的载体芯，如果使用已经通过将粒径为0.1的煅烧催化材料施加到 300μm，以1至40g / min /升的载体和水，催化材料与水的重量比为1:1至8:1，彼此连续且分开，每个在 恒定速度，低于100℃，以剧烈搅拌的载体颗粒，其可以或可以不预先用水进行预浸泡，其量高达颗粒的吸水性的95％，催化剂b的制备 以使得形成的涂层的含水量小于催化材料的最大饱和度的方式进行。