PROCESS FOR THE PREPARATION OF NITROBENZENE BY ADIABATIC NITRATION
    152.
    发明申请
    PROCESS FOR THE PREPARATION OF NITROBENZENE BY ADIABATIC NITRATION 有权
    通过ADIABATIC NITRATION制备硝基苯的方法

    公开(公告)号:US20160083332A1

    公开(公告)日:2016-03-24

    申请号:US14785763

    申请日:2014-04-24

    CPC classification number: C07C201/08 C07C201/16 C07C205/06

    Abstract: The present invention relates to a continuously operated adiabatic process for the preparation of nitrobenzene by nitration of benzene with nitric acid and sulfuric acid, in which the dilute sulfuric acid obtained after the nitration has taken place and the crude nitrobenzene has been separated off from the aqueous phase is concentrated for the purpose of re-use in the nitration, and after its concentration, at least one minute before it comes into contact with fresh nitric acid again an oxidizing agent is added such that a concentration of the oxidizing agent of from 10 ppm to 5,000 ppm, based on the total weight of the concentrated sulfuric acid to be recycled into the nitration, is established.

    Abstract translation: 本发明涉及用硝酸和硫酸硝化苯来制备硝基苯的连续操作的绝热方法,其中在硝化发生后获得的稀硫酸和粗硝基苯已从水溶液中分离出来 浓缩的浓度是为了在硝化中重复使用,并且在其浓缩之后,再次与新鲜硝酸接触至少一分钟,加入氧化剂使得氧化剂的浓度为10ppm 至5,000ppm,基于要再循环到硝化中的浓硫酸的总重量。

    Process for the adiabatic preparation of mononitrohalogenobenzenes
    158.
    发明授权
    Process for the adiabatic preparation of mononitrohalogenobenzenes 失效
    绝热制备单硝基卤代苯的工艺

    公开(公告)号:US5714647A

    公开(公告)日:1998-02-03

    申请号:US785577

    申请日:1997-01-21

    CPC classification number: C07C201/08

    Abstract: Mononitrohalogenobenzenes can be prepared by mixing halogenobenzene, nitric acid, sulphuric acid and water intensively with one another, simultaneously or in succession in their total quantity, and by redispersing them at least twice in the case of continuous preparation, applying a mixing energy of 1-40 watts per liter of the overall reaction mixture, preferably 3-30 W/l, largely suppressing back-mixing in the continuous procedure, and observing adiabatic reaction conditions.

    Abstract translation: 一硝基卤代苯可以通过将卤代苯,硝酸,硫酸和水彼此同时或相继地以总量相互重叠混合,并且在连续制备的情况下将它们再分散至少两次来制备, 总体反应混合物为40瓦/升,优选为3-30W / l,在连续方法中大大抑制了反混合,并且观察绝热反应条件。

    Process for the production of dinitrotoluene
    159.
    发明授权
    Process for the production of dinitrotoluene 失效
    生产二硝基甲苯的方法

    公开(公告)号:US5679873A

    公开(公告)日:1997-10-21

    申请号:US510992

    申请日:1995-08-03

    CPC classification number: C07C201/08

    Abstract: Dinitrotoluene is produced in a two-stage process from toluene and nitric acid in the presence of sulfuric acid under adiabatic conditions in the presence of nitrating acids made up of specified components. The reaction product of the first phase is separated into an acid phase and an organic phase containing the mononitrotoluene. Some water is removed from the acid phase, nitric acid is added and the resultant mixture is recycled. The organic phase containing mononitrotoluene is further nitrated to produce the dinitrotoluene. This nitration mixture is also separated into an acid phase and an organic phase. The acid phase is treated to remove some water, nitric acid is added and the resultant acid mixture is recycled. Dinitrotoluene is recovered from the organic phase. This process is advantageous in that dilute nitric acid may be used and the heat of the nitration reaction is utilized.

    Abstract translation: 在绝酸条件下,在由特定组分组成的硝酸的存在下,在硫酸存在下,甲苯和硝酸二步法生产二硝基甲苯。 将第一相的反应产物分离成酸相和含有一硝基甲苯的有机相。 从酸相中除去一些水,加入硝酸并将所得混合物回收。 含有单硝基甲苯的有机相进一步硝化以产生二硝基甲苯。 该硝化混合物也分离成酸相和有机相。 处理酸相以除去一些水,加入硝酸并将所得酸混合物再循环。 从有机相回收二硝基甲苯。 该方法的优点在于可以使用稀硝酸并利用硝化反应的热。

    Process for the adiabatic preparation of mononitrotoluenes
    160.
    发明授权
    Process for the adiabatic preparation of mononitrotoluenes 失效
    制备单硝基甲苯的绝热方法

    公开(公告)号:US5648565A

    公开(公告)日:1997-07-15

    申请号:US679323

    申请日:1996-07-12

    CPC classification number: C07C201/08

    Abstract: Mononitrotoluenes can be prepared by intensively mixing together toluene, nitric acid, sulphuric acid and water, simultaneously or successively in their total amount, and, in the case of continuous preparation, redispersing the mixture at least twice, for which purpose a mixing energy of 1 to 40 watts per liter of the total reaction mixture, preferably 3 to 30 W/l, is employed per volume of the reactor, and, for the continuous procedure, the back mixing is substantially repressed. Adiabatic reaction conditions are maintained.

    Abstract translation: 单硝基甲苯可以通过将甲苯,硝酸,硫酸和水同时或相继浓缩在一起而制备,并且在连续制备的情况下,将混合物再分散至少两次,为此目的的混合能量为1 至40瓦/升的总反应混合物,优选3至30W / l,并​​且对于连续方法,背混合基本上被压制。 保持绝热反应条件。

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