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    Oxidation catalyst, especially for the preparation of methacrylic acid by gas phase oxidation of methacrolein
    5.
    发明授权
    Oxidation catalyst, especially for the preparation of methacrylic acid by gas phase oxidation of methacrolein 失效
    氧化催化剂，特别是通过气相氧化甲基丙烯醛制备甲基丙烯酸

    公开(公告)号：US4489170A

    公开(公告)日：1984-12-18

    申请号：US470942

    申请日：1983-03-01

    申请人： Richard Krabetz ,  Matthias Schwarzmann

    发明人： Richard Krabetz ,  Matthias Schwarzmann

    IPC分类号： B01J27/188 ,  B01J27/19 ,  C07B61/00 ,  C07C51/00 ,  C07C51/25 ,  C07C57/055 ,  C07C67/00 ,  B01J27/14 ,  C07C51/16

    CPC分类号： B01J27/19 ,  C07C51/252

    摘要： Oxidation catalysts which in addition to oxygen ions, with or without NH.sub.4.sup.+ ions, contain molybdenum, tungsten, phosphorus and antimony as basic components, in the atomic ratio Mo:W:P:Sb=12:0.1-3:0.1-4:0.1-3, and which are prepared in a conventional manner by combining molybdenum, phosphorus, antimony and tungsten compounds in aqueous solutions or suspensions, removing the water and calcining the residues, the combination being carried out at chloride ion concentrations of less than 0.3 mole per mole of molybdenum and in the presence of ions of monocarboxylic acids of 1 or 2 carbon atoms, dicarboxylic acids or hydroxycarboxylic acids, are particularly suitable for the gas phase oxidation of methacrolein to methacrylic acid.

    摘要翻译： 除了具有或不具有NH 4+离子的氧离子之外，氧原子催化剂以Mo，W：P：Sb = 12：0.1-3：0.1-4：0.1的原子比含有钼，钨，磷和锑作为碱性组分 -3，并且以常规方式通过在水溶液或悬浮液中组合钼，磷，锑和钨化合物来制备，除去水和煅烧残余物，所述组合在氯离子浓度小于0.3摩尔/ 摩尔钼，在1或2个碳原子的一元羧酸的离子存在下，二羧酸或羟基羧酸，特别适用于将甲基丙烯醛气相氧化成甲基丙烯酸。

    Preparation of methacrylic acid
    6.
    发明授权
    Preparation of methacrylic acid 失效
    甲基丙烯酸的制备

    公开(公告)号：US5087744A

    公开(公告)日：1992-02-11

    申请号：US213837

    申请日：1988-06-30

    申请人： Richard Krabetz ,  Gerd Duembgen ,  Franz Merger ,  Michael Jaeger ,  Fritz Thiessen ,  Herbert Vogal

    发明人： Richard Krabetz ,  Gerd Duembgen ,  Franz Merger ,  Michael Jaeger ,  Fritz Thiessen ,  Herbert Vogal

    IPC分类号： B01J27/19 ,  C07B63/04 ,  C07C51/00 ,  C07C51/235 ,  C07C51/25 ,  C07C57/055 ,  C07C57/07 ,  C07C67/00

    CPC分类号： C07C51/252

    摘要： Methacrylic acid can be prepared with advantage by gas phase oxidation of methacrolein or isobutyraldehyde over Mo- and P-containing catalysts at from 250.degree. to 400.degree. C. with cooling of the hot reaction gas to below 100.degree. C., absorption of the methacrylic acid in a water-operated absorption column, at below 100.degree. C. and partial recycling into the oxidation reactor after admixture of methacrolein or isobutyraldehyde and oxygen by feeding a quantity of methacrolein or isobutyraldehyde equal to the quantity of methacrolein or isobutyraldehyde consumed in the reaction in liquid form together with a polymerization inhibitor into the reactor gas in the lower two-thirds of the absorber column and upstream of the feed point for the fresh methacrolein or isobutyraldehyde or down-stream of the absorption column splitting off the reactor off-gas a side stream which is washed in a wash column operated with water at

    摘要翻译： 甲基丙烯酸可以通过在250℃至400℃的含Mo和P的催化剂上甲基丙烯醛或异丁醛的气相氧化来制备，同时将热反应气体冷却至低于100℃，吸收甲基丙烯酸 酸在水性吸收塔中，低于100℃，并通过加入与反应中消耗的甲基丙烯醛或异丁醛的量相等的量的异丁烯醛或异丁醛，将甲基丙烯醛或异丁醛和氧气混合后，部分再循环进入氧化反应器 液体形式与聚合抑制剂一起在吸收塔的下三分之二的反应器气体中，在新鲜的甲基丙烯醛或异丁醛的进料点的上游或吸收塔的下游分离反应器废气a 侧流在洗涤塔中用水在<10℃下洗涤以除去未转化的异丁烯醛或异丁醛，其为f 作为吸收塔顶部的水溶液。