Method and system for producing nitrobenzene
    211.
    发明授权
    Method and system for producing nitrobenzene 有权
    制备硝基苯的方法和系统

    公开(公告)号:US09139508B2

    公开(公告)日:2015-09-22

    申请号:US14374665

    申请日:2013-01-28

    CPC classification number: C07C201/08 C01B17/88 C01B17/94 C07C205/06

    Abstract: The present invention relates to a process and a plant for the production, in particular the continuous production, of nitrobenzene by means of adiabatic nitration of benzene with nitric acid in the presence of sulfuric acid, in which, following the nitration, a multi-stage concentration of the sulfuric acid is carried out by means of heating at a pressure that is reduced as compared with ambient pressure, and wherein the heating takes place using the heat generated in the adiabatic nitration of benzene.

    Abstract translation: 本发明涉及在硫酸存在下通过苯与硝酸的绝热硝化来生产,特别是连续生产硝基苯的方法和设备,其中在硝化之后,进行多阶段 通过在与环境压力相比降低的压力下加热进行硫酸的浓度,并且其中使用在苯的绝热硝化中产生的热量进行加热。

    Process for the production of 1,5-dinitronaphthalene
    216.
    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 nitro compounds
    220.
    发明授权
    Method for producing nitro compounds 失效
    硝基化合物的制备方法

    公开(公告)号:US5956657A

    公开(公告)日:1999-09-21

    申请号:US997585

    申请日:1997-12-23

    CPC classification number: C07B43/02 C07C201/08 C07C2103/74

    Abstract: The method provides nitro compounds at a high conversion and selectivity by nitrating substrates under comparatively mild conditions in the absence of catalysts. Organic substrates are nitrated using no catalysts or ozone, but using (1) at least one nitrogen compound selected from N.sub.2 O or NO and oxygen. It is advantageous for the nitration reaction to employ a nitrogen compound obtained by a reaction of the nitrogen compound with oxygen, particularly a nitrogen oxide comprising N.sub.2 O.sub.3 as a main component. Additionally, organic substrates are nitrated using (2) NO.sub.2. The substrates include a compound having a methine-carbon atom, and a compound having a methyl group or methylene group in an adjacent position to an aromatic ring.

    Abstract translation: 该方法通过在不存在催化剂的情况下在相对温和的条件下硝化底物以高转化率和选择性提供硝基化合物。 使用没有催化剂或臭氧的有机底物进行硝化,但使用(1)至少一种选自N 2 O或NO的氮化合物和氧气。 硝化反应采用氮化合物与氧反应获得的氮化合物,特别是以N 2 O 3为主要成分的氮氧化物是有利的。 另外,使用(2)NO2对有机底物进行硝化。 底物包括具有次甲基 - 碳原子的化合物和在芳香环相邻位置具有甲基或亚甲基的化合物。

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