Method for producing nitrobenzene compound
    15.
    发明授权
    Method for producing nitrobenzene compound 有权
    硝基苯化合物的制备方法

    公开(公告)号:US09006477B2

    公开(公告)日:2015-04-14

    申请号:US14131106

    申请日:2012-07-04

    CPC classification number: C07C201/06 C07C205/06 C07C205/58

    Abstract: A method for producing a nitrobenzene compound represented by general formula (2),wherein R1 and R5 are the same or different, and each is a halogen atom or another functional group, and R2, R3, and R4 are the same or different, and each is a hydrogen atom or another functional group, comprises oxidizing an aniline compound represented by general formula (1), wherein R1, R2, R3, R4, and R5 are the same as described above, with hydrogen peroxide in the presence of a tungsten compound under an acidic condition, followed by oxidation with hydrogen peroxide under a neutral to alkaline condition.

    Abstract translation: 一种制备由通式(2)表示的硝基苯化合物的方法,其中R1和R5相同或不同,并且各自为卤素原子或其它官能团,R2,R3和R4相同或不同, 各自为氢原子或另一官能团,包括将氧化由通式(1)表示的苯胺化合物,其中R1,R2,R3,R4和R5与上述相同,与过氧化氢在钨存在下 在酸性条件下,然后在中性至碱性条件下用过氧化氢氧化。

    Process for the production of 1,5-dinitronaphthalene
    16.
    发明申请
    Process for the production of 1,5-dinitronaphthalene 失效
    生产1,5-二硝基萘的方法

    公开(公告)号:US20050107646A1

    公开(公告)日:2005-05-19

    申请号:US10979949

    申请日:2004-11-02

    CPC classification number: C07C201/08 C07C205/06

    Abstract: The invention is directed to a process for the production of 1,5-dinitronaphthalene wherein naphthalene is nitrated by nitric acid in the absence of sulfuric acid at temperatures of from 30 to 80° C., wherein the nitric acid has a concentration of from 72 to 87 wt.-%, the reaction mixture obtained is filtered at temperatures of from 5 to 20° C. and the solid precipitate obtained is washed with water, and 1,5-dinitronaphthalene is isolated from the washed precipitate by washing with acetone.

    Abstract translation: 本发明涉及一种生产1,5-二硝基萘的方法,其中在不存在硫酸的情况下,硝酸在30-80℃的温度下硝化硝酸,其中硝酸的浓度为72 得到的反应混合物在5至20℃的温度下过滤,所得固体沉淀物用水洗涤,用丙酮洗涤从洗涤的沉淀物中分离出1,5-二硝基萘。

    METHOD FOR PRODUCING NITROBENZENE BY ADIABATIC NITRIDING
    20.
    发明申请
    METHOD FOR PRODUCING NITROBENZENE BY ADIABATIC NITRIDING 有权
    通过自制氮化生产硝基苯的方法

    公开(公告)号:US20150175522A1

    公开(公告)日:2015-06-25

    申请号:US14415788

    申请日:2013-07-23

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

    Abstract: The invention provides a continuous adiabatic process for the preparation of nitrobenzene by nitrating benzene with mixtures of sulfuric and nitric acids using a stoichiometric excess of benzene, wherein the content of organic compounds in the circulating sulfuric acid, at least during the start-up period of the production plant, is always kept below 1.0 mass percent, based on the total mass of circulating sulfuric acid. This is preferably achieved by a procedure in which, either after the end or before the beginning of a production cycle, the circulating sulfuric acid is circulated at elevated temperature so that the organics contained in the sulfuric acid, preferably comprising nitrobenzene and traces of benzene, dinitrobenzene and nitrophenols, are separated off in the evaporation apparatus for concentrating the sulfuric acid.

    Abstract translation: 本发明提供了一种连续的绝热方法,用于通过使用化学计量过量的苯将硫与硝酸的混合物硝化苯来制备硝基苯,其中循环硫酸中有机化合物的含量至少在启动期间 基于循环硫酸的总质量,生产厂总是保持在1.0质量%以下。 这优选通过以下程序来实现,其中,在生产周期结束或开始之前循环硫酸在升高的温度下循环,使得包含在硫酸中的有机物,优选包含硝基苯和痕量的苯, 二硝基苯和硝基苯酚在用于浓缩硫酸的蒸发装置中分离出来。

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