Process for producing methacrylic acid from isobutylene by two step
oxidation
    1.
    发明授权
    Process for producing methacrylic acid from isobutylene by two step oxidation 失效
    通过两步氧化从异丁烯生产甲基丙烯酸的方法

    公开(公告)号:US4124634A

    公开(公告)日:1978-11-07

    申请号:US775427

    申请日:1977-03-08

    摘要: In a process for producing methacrylic acid by two step oxidation comprising a first oxidation step of producing methacrolein by reacting isobutylene with molecular oxygen in the presence of a diluent gas and a catalyst, and a second oxidation step of producing methacrylic acid by reacting methacrolein with molecular oxygen in the presence of a diluent gas and a catalyst, the improvement comprises using nitrogen as the diluent gas in the first oxidation step and nitrogen and steam as the diluent gas in the second oxidation step, mixing the reaction products obtained in the first and second oxidation steps, separating and recovering methacrolein and methacrylic acid from the mixture and feeding the recovered methacrolein back into the second oxidation step as a starting material.

    摘要翻译: 在通过两步氧化制备甲基丙烯酸的方法中,包括在稀释气体和催化剂的存在下使异丁烯与分子氧反应制备甲基丙烯醛的第一氧化步骤,以及通过使甲基丙烯醛与分子反应生产甲基丙烯酸的第二氧化步骤 在稀释气体和催化剂存在下的氧气,改进包括在第一氧化步骤中使用氮气作为稀释气体,在第二氧化步骤中使用氮气和蒸汽作为稀释气体,将在第一和第二氧化步骤中获得的反应产物混合 氧化步骤,从混合物中分离和回收甲基丙烯醛和甲基丙烯酸,并将回收的甲基丙烯醛反馈回第二氧化步骤作为起始原料。

    Process for producing trifluoroacetic acid and trifluoroacetyl chloride
    2.
    发明授权
    Process for producing trifluoroacetic acid and trifluoroacetyl chloride 失效
    制备三氟乙酸和三氟乙酰氯的方法

    公开(公告)号:US5041647A

    公开(公告)日:1991-08-20

    申请号:US930056

    申请日:1986-11-12

    IPC分类号: C07C51/21 C07C51/58

    CPC分类号: C07C51/21 C07C51/58

    摘要: A process for producing trifluoroacetic acid and trifluoroacetyl chloride from 1,1-dichloro-2,2,2-trifluoroethane, oxygen and water as starting materials, characterized in that the starting materials are reacted in a vapor phase in a reactor of perfect mixing type to avoid local heating, under a condition not to liquefy the starting materials and reaction products, while continuously supplying the starting materials and continuously withdrawing the reaction products, so as to obtain a reaction mixture comprising trifluoroacetyl chloride as the main product and trifluoroacetic acid as an accompanying product.

    摘要翻译: 一种由1,1-二氯-2,2,2-三氟乙烷,氧和水作为起始原料生产三氟乙酸和三氟乙酰氯的方法,其特征在于起始原料在气相中在完全混合型的反应器 为了避免局部加热,在不引起原料和反应产物液化的条件下,同时连续供给原料并连续取出反应产物,得到以三氟乙酰氯为主要成分的反应混合物,三氟乙酸为 伴随产品。