申请人:MITSUBISHI CHEMICAL CORPORATION
公开号:EP1752437A1
公开(公告)日:2007-02-14
An object of the present invention is to provide a method for producing (meth)acrylic acid or (meth)acrolein by conducting a gas phase catalytic oxidation reaction with an oxygen-containing gas using as a raw material at least one substance to be oxidized selected from propylene, propane, isobutylene and (meth)acrolein using a multi-tubular reactor, which enables a high yield and stable production even when operating constantly with supplying the raw material in the maximum supply amount acceptable by the reactor or an amount close thereto.
The invention is a method for producing (meth)acrylic acid or (meth)acrolein wherein, at the time of a start-up of the reaction, for a period of at least 20 hours or more after the supply amount of the raw material to the reactor per unit time reached 30% or more of the acceptable maximum supply amount of the raw material per unit time, the supply amount of the raw material per unit time is kept at 30% or more and less than 80% of the acceptable maximum supply amount.
本发明的目的是提供一种通过使用多管式反应器,利用丙烯、丙烷、异丁烯和(甲基)丙烯醛中至少一种氧化物质作为原料,通过气相催化氧化反应使用含氧气体,即使在以反应器可接受的最大供应量或接近该量供应原料的情况下持续运行,也能实现高产率和稳定生产的方法。
该发明是一种生产(甲基)丙烯酸或(甲基)丙烯醛的方法,其中,在反应启动时,当单位时间内供应给反应器的原料量达到单位时间内可接受的最大供应量的30%或更多时,保持单位时间内的原料供应量为30%或更多,但小于可接受的最大供应量的80%。