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1. 发明授权

US5087744A Preparation of methacrylic acid 失效
标题翻译：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。

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