Process for the preparation of nitrobenzene by adiabatic nitration
    7.
    发明授权
    Process for the preparation of nitrobenzene by adiabatic nitration 有权
    通过绝热硝化制备硝基苯的方法

    公开(公告)号:US07781624B2

    公开(公告)日:2010-08-24

    申请号:US12315907

    申请日:2008-12-08

    IPC分类号: C07C205/00

    CPC分类号: C07C201/08 C07C205/06

    摘要: This invention relates to a process for the continuous preparation of nitrobenzene. This process comprises the adiabatic nitration of benzene with a mixture of sulfuric acid and nitric acid, in which the sum of the concentrations in the reaction zone of the metal ions which form sparingly soluble metal sulfates is less than 900 mg/l, based on the volume of the aqueous phase which contains sulfuric acid.

    摘要翻译: 本发明涉及连续制备硝基苯的方法。 该方法包括苯与硫酸和硝酸的混合物的绝热硝化,其中形成微溶金属硫酸盐的金属离子的反应区中的浓度之和小于900mg / l,基于 含有硫酸的水相体积。

    Process for the production of 4,4'-diphenylmethane diisocyanate
    8.
    发明申请
    Process for the production of 4,4'-diphenylmethane diisocyanate 审中-公开
    生产4,4'-二苯基甲烷二异氰酸酯的方法

    公开(公告)号:US20070117997A1

    公开(公告)日:2007-05-24

    申请号:US11599640

    申请日:2006-11-15

    IPC分类号: C07C249/00

    摘要: The present invention relates to a process for the production of 4,4′-diphenylmethane diisocyanate (4,4′-MDI) by acid-catalyzed condensation of aniline with formaldehyde, reaction of the mixtures of di- and polyamines obtained with phosgene to form the corresponding mixture of MDI isomers and homologues (di- and polyisocyanates of the diphenylmethane series) and subsequent separation of the mixture by distillation to form 4,4′-MDI and polymeric MDI.

    摘要翻译: 本发明涉及通过苯胺与甲醛的酸催化缩合制备4,4'-二苯基甲烷二异氰酸酯(4,4'-MDI)的方法,由光气获得的二胺和多胺的混合物反应形成 MDI异构体和同系物(二苯基甲烷系列的二异氰酸酯和多异氰酸酯)的相应混合物,然后通过蒸馏分离混合物以形成4,4'-MDI和聚合MDI。