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2. 发明申请

US20130261335A1 PROCESS FOR PRODUCING ALKYL METHACRYLATE 有权
标题翻译：生产甲基丙烯酸甲酯的方法
公开(公告)号：US20130261335A1
公开(公告)日：2013-10-03
申请号：US13840286
申请日：2013-03-15
申请人： SUMITOMO CHEMICAL COMPANY, LIMITED
发明人： Noriaki SUYASU , Eiichi SHIRAISHI
IPC分类号： C07C51/25
CPC分类号： C07C51/252 , C07C57/04
摘要： An object of the present invention is to provide a process for producing methacrylic acid with good productivity over a long period of time.The present invention provides a process for producing methacrylic acid by oxidizing methacrolein with oxygen in a continuous manner, comprising supplying a mixed gas containing methacrolein, isobutylene and oxygen and having a content of isobutylene of 300 to 3000 volume ppm, initiating the oxidation so that the methacrolein conversion at an outlet of a reactor becomes at least 85% and, thereafter, continuing the oxidation while the mixed gas having a content of isobutylene of 300 to 3000 volume ppm is supplied until a difference (X1−X2) between methacrolein conversion (X2) at the outlet of the reactor and methacrolein conversion (X1) at the outlet of the reactor at the time of the initiation of oxidation comes into the range of 2 to 30%, and continuing the oxidation while the mixed gas having a content of isobutylene of 500 volume ppm or less is supplied, after the difference (X1−X2) comes into the range of 2 to 30%.
摘要翻译：本发明的目的是提供一种在长时间内以高生产率生产甲基丙烯酸的方法。本发明提供一种通过以氧气连续氧化甲基丙烯醛生产甲基丙烯酸的方法，包括提供含异丁烯醛，异丁烯和氧的混合气体，其异丁烯含量为300〜3000体积ppm，开始氧化，在反应器出口处的甲基丙烯醛转化率至少为85％，然后继续氧化，同时供给异丁烯含量为300〜3000体积ppm的混合气体，直到甲基丙烯醛转化率（X2 ）和在氧化开始时反应器出口处的异丁烯醛转化率（X1）为2〜30％的范围，继续氧化，同时具有异丁烯含量的混合气体在差值（X1-X2）达到2〜30％的范围后，供给500体积ppm以下。

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