METHOD FOR THE PRODUCTION OF D,L-METHIONINE
    8.
    发明申请
    METHOD FOR THE PRODUCTION OF D,L-METHIONINE 审中-公开
    生产D,L-甲硫氨酸的方法

    公开(公告)号:US20150197489A1

    公开(公告)日:2015-07-16

    申请号:US14671435

    申请日:2015-03-27

    IPC分类号: C07C319/20

    摘要: A method to produce D,L-Methionine from 2-hydroxy-4-(methylthio)butyronitrile by reaction with ammonia, optionally in the presence of carbon dioxide, is provided. The 2-hydroxy-4-(methylthio)butyronitrile is obtained by reaction of 3-methylmercapto-propionaldehyde with hydrogen cyanide in the presence of a base as catalyst in a main reaction zone of a multizone reactor. Residual gaseous hydrogen cyanide is removed from the main reaction zone to an absorption and post-reaction zone of the reactor which comprises a mixture of 3-methylmercaptopropionaldehyde and the catalyst; and the gaseous hydrogen cyanide is further reacted with the 3-methylmercaptopropionaldehyde in the absorption and post reaction zone. A molar ratio of hydrogen cyanide to 3-(methylthio)propanal in the main reaction zone is from 0.98 to 1.03.

    摘要翻译: 提供了通过与氨反应,任选在二氧化碳存在下,由2-羟基-4-(甲硫基)丁腈生成D,L-甲硫氨酸的方法。 2-羟基-4-(甲硫基)丁腈是通过在多基团反应器的主反应区中作为催化剂的碱作为催化剂使3-甲基巯基丙醛与氰化氢反应得到的。 残留的气态氰化氢从主反应区除去反应器的吸收和后反应区,其包含3-甲基巯基丙醛和催化剂的混合物; 并且氰化氢气体在吸收和后反应区域中与3-甲基巯基丙醛进一步反应。 主反应区氰化氢与3-(甲硫基)丙醛的摩尔比为0.98-1.03。