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    • 3. 发明授权
    • Process for the two-step production of dinitrotoluene
    • 两步生产二硝基甲苯的方法
    • US06984762B2
    • 2006-01-10
    • US10780266
    • 2004-02-17
    • Erwin DieterichAnke HielscherBerthold KeggenhoffManfred Keller-KillewaldJürgen MünnigDietmar Wastian
    • Erwin DieterichAnke HielscherBerthold KeggenhoffManfred Keller-KillewaldJürgen MünnigDietmar Wastian
    • C07C205/00
    • C07C201/16C07C201/08C07C205/06
    • The invention relates to a process for the production of dinitrotoluene by the two-stage nitration of toluene. In the first stage of this process, toluene was reacted adiabatically with nitrating acid so that at least 90% of the toluene was reacted off and no more than 70% of the toluene formed dinitrotoluene. The resulting organic phase containing mononitrotoluene and the aqueous acid phase containing sulfuric acid were separated, and the aqueous acid phase containing sulfuric acid was concentrated by flash evaporation. The resulting concentrated sulfuric acid was recycled into the reaction in the first stage, and/or into the reaction in the second stage, and/or into the concentration in the second stage.In the second stage, the organic phase containing mononitrotoluene from the first stage was completely reacted isothermally with nitrating acid. The organic phase and the aqueous acid phase containing sulfuric acid were then separated, and the aqueous acid phase containing sulfuric acid was concentrated by vacuum evaporation. The resulting concentrated sulfuric acid was recycled into the reaction in the first stage and/or the second stage.
    • 本发明涉及通过甲苯二段硝化生产二硝基甲苯的方法。 在该方法的第一阶段,将甲苯与硝酸进行绝热反应,使得甲苯的至少90%反应,并且不超过70%的甲苯形成二硝基甲苯。 分离含有单硝基甲苯和含硫酸水相的所得有机相,通过闪蒸浓缩含硫酸水相。 将所得浓硫酸在第一阶段循环进入反应,和/或在第二阶段进入反应,和/或在第二阶段中浓缩。 在第二阶段,含有来自第一阶段的一硝基甲苯的有机相与硝酸一起等温共同反应。 然后分离含有硫酸的有机相和含水酸相,真空蒸发浓缩含硫酸的酸水溶液。 所得浓硫酸在第一阶段和/或第二阶段循环进入反应。
    • 9. 发明授权
    • Process for the production of dinitrotoluene
    • 生产二硝基甲苯的方法
    • US07041858B1
    • 2006-05-09
    • US11054012
    • 2005-02-09
    • Juergen MuennigBernd PennemannDietmar WastianVolker MicheleJesse CaravaggioJohn F. Gisch, Jr.
    • Juergen MuennigBernd PennemannDietmar WastianVolker MicheleJesse CaravaggioJohn F. Gisch, Jr.
    • C07C205/00
    • C07C201/08C07C205/06
    • The present invention is directed to a process for the isothermal nitration of aromatic organic compounds, wherein an aromatic organic compound is brought into contact and reacted with a mixture of sulfuric acid and nitric acid. The mixture of sulfuric acid and nitric acid, and the aromatic organic compound are brought into contact with each other through a mixing nozzle which comprises a substantially cylindrical tubular reactor and an annular gap which surrounds the tubular reactor. The aromatic organic compound flows through the tubular reactor, and the mixture of sulfuric acid and nitric acid flows through the annular gap, and they are mixed together upon emerging from the tubular reactor and the annular gap, wherein the ratio of the average rates of flow of the aromatic organic compound in the tubular reactor, and of the mixture of sulphuric acid and nitric acid in the annular gap ranges from 0.5:1 to 10:1.
    • 本发明涉及芳族有机化合物的等温硝化方法,其中使芳族有机化合物与硫酸和硝酸的混合物接触并反应。 硫酸和硝酸的混合物和芳香族有机化合物通过混合喷嘴相互接触,所述混合喷嘴包括基本上圆柱形的管式反应器和围绕管状反应器的环形间隙。 芳族有机化合物流过管状反应器,硫酸和硝酸的混合物流过环形间隙,并且在从管式反应器和环形间隙出现时将它们混合在一起,其中平均流速 的管状反应器中的芳族有机化合物,以及环状间隙中的硫酸和硝酸的混合物的范围为0.5:1至10:1。