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    • 9. 发明授权
    • Process for producing methacrylic acid
    • 生产甲基丙烯酸的方法
    • US06410786B1
    • 2002-06-25
    • US09556697
    • 2000-04-24
    • Hideo OnoderaNaomasa KimuraEiichi Shiraishi
    • Hideo OnoderaNaomasa KimuraEiichi Shiraishi
    • C07C5121
    • C07C51/252C07C57/04
    • A process for vapor phase catalytic oxidation of methacrolein to produce methacrylic acid at high yield and with stability over a prolonged period is provided. The process is characterized, in the occasion of producing methacrylic acid by vapor phase catalytic oxidation of methacrolein using a fixed bed shell-and-tube reactor, in that (1) the catalyst layer in each reaction tube is divided into at least two layers in the axial direction of the tube to provide plural reaction zones, and (2) each of the reaction zones is filled with the catalyst in such a manner that the amount of the catalytically active component per unit volume of the reaction tube decreases from the gas inlet portion toward the gas outlet portion.
    • 提供了甲基丙烯醛的气相催化氧化以高产率和长时间稳定地生产甲基丙烯酸的方法。 该方法的特征在于,通过使用固定床管壳反应器通过气相催化氧化甲基丙烯醛来生产甲基丙烯酸,其中(1)将每个反应管中的催化剂层分成至少两层 管的轴向以提供多个反应区,和(2)每个反应区用催化剂填充,使得每单位体积的催化活性组分的量从气体入口减少 部分朝向气体出口部分。