Method for producing nitrobenzene compound
    214.
    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
    215.
    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。

    PROCESS FOR CONCENTRATING DILUTED SULFURIC ACID

    公开(公告)号:WO2022101353A1

    公开(公告)日:2022-05-19

    申请号:PCT/EP2021/081406

    申请日:2021-11-11

    Applicant: BASF SE

    Abstract: The invention relates to a process for concentrating diluted sulfuric acid (10) which may comprise at least one nitroaromatic compound and/or nitric acid as impurities, comprising: (a) feeding the diluted sulfuric acid (10) into a first stage (1) in which low boilers are removed by evaporation and/or stripping to obtain a first concentrated sulfuric acid (12); (b) optionally feeding the first concentrated sulfuric acid (12) into a second evaporation stage (2) to obtain a second concentrated sulfuric acid (14); (c) feeding the second concentrated sulfuric (14) acid into a third evaporation stage (3) if step (b) is carried out, or feeding the first concentrated sulfuric acid (12) into the third evaporation stage (3) if step (b) is not carried out, to obtain concentrated sulfuric acid (16) as product, wherein an oxidizing agent (17) and/or a precursor of an oxidizing agent is fed into the third evaporation stage (3).

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