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    Aromatic nitration reactions
    41.
    发明授权
    Aromatic nitration reactions 失效
    芳香硝化反应

    公开(公告)号：US06906231B2

    公开(公告)日：2005-06-14

    申请号：US10398692

    申请日：2001-10-05

    Applicant: Martyn John Earle ,  Suhas Prabhakar Katdare

    Inventor： Martyn John Earle ,  Suhas Prabhakar Katdare

    IPC: C07B43/02 ,  C07B61/00 ,  C07C201/08 ,  C07C205/06 ,  C07C205/12 ,  C07C205/37

    CPC classification number: C07C201/08 ,  C07C205/06 ,  C07C205/12 ,  C07C205/37

    Abstract: A process for the nitration of an aromatic compound, wherein the aromatic compound is admixed with a nitrating agent in the presence of an ionic liquid is described. The method for the nitration of aromatic compounds in (e.g. neutral) ionic liquids has advantages over conventional nitrations, such as the only by-product being water, the ionic liquid not being consumed and the nitrating agent being relatively inexpensive.

    Abstract translation: 描述了在离子液体存在下将芳族化合物与硝化剂混合的芳族化合物的硝化方法。 在（例如中性）离子液体中硝化芳族化合物的方法具有优于常规硝化的优点，例如仅有副产物是水，离子液体不被消耗，硝化剂相对便宜。

    Process for the two-step production of dinitrotoluene
    42.
    发明申请
    Process for the two-step production of dinitrotoluene 有权
    两步生产二硝基甲苯的方法

    公开(公告)号：US20040267061A1

    公开(公告)日：2004-12-30

    申请号：US10780266

    申请日：2004-02-17

    Inventor： Erwin Dieterich ,  Anke Hielscher ,  Berthold Keggenhoff ,  Manfred Keller-Killewald ,  Jurgen Munnig ,  Dietmar Wastian

    IPC: C07C25/06

    CPC classification number: C07C201/16 ,  C07C201/08 ,  C07C205/06

    Abstract: The invention relates to a process for the production of dinitrotoluene by the two-stage nitration of toluene. This process consists of a) a first stage wherein toluene is reacted adiabatically with nitrating acid such that at least 90% of the toluene is reacted off and no more than 70% of the toluene used reacts to form dinitrotoluene, the organic phase containing mononitrotoluene and the aqueous acid phase containing sulfuric acid are then separated, the aqueous acid phase containing sulfuric acid is concentrated by flash evaporation, and the resulting concentrated sulfuric acid is 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, and b) a second stage wherein the organic phase containing mononitrotoluene from the first stage is completely reacted isothermally with nitrating acid, the organic phase and the aqueous acid phase containing sulfuric acid are then separated, and the aqueous acid phase containing sulfuric acid is concentrated by vacuum evaporation, and the resulting concentrated sulfuric acid is recycled into the reaction in the first stage and/or the second stage.

    Process for preparing aromatic amines
    43.
    发明申请
    Process for preparing aromatic amines 有权
    制备芳香胺的方法

    公开(公告)号：US20040249213A1

    公开(公告)日：2004-12-09

    申请号：US10454332

    申请日：2003-06-04

    Inventor： Berthold Keggenhoff ,  Karl R. Sittkus ,  Claudia Mueller ,  Demetrios N. Zervoudis

    IPC: C07C29/38

    CPC classification number: C07C209/36 ,  C07C201/08 ,  C07C201/16 ,  C07C211/51 ,  C07C205/06

    Abstract: Aromatic amines are produced from aromatic hydrocarbons by a) reacting the aromatic hydrocarbon(s) with a mixture of nitric acid and sulfuric acid to generate a two-phase reaction mixture, b) separating the reaction mixture into an aqueous acid phase and an organic phase containing the nitroaromatic compounds c) washing the organic phase to purify the nitroaromatic compound(s), d) hydrogenating the nitroaromatic compound(s) in the presence of a catalyst to produce the aromatic amine(s) and water of reaction, and e) separating the water of reaction formed in step d) from the aromatic amine(s), in which the water of reaction separated in step e) is used to wash the organic phase containing the nitroaromatic compounds in step c).

    Abstract translation: 通过以下方式由芳族烃制备芳族胺：a）使芳族烃与硝酸和硫酸的混合物反应以产生两相反应混合物，b）将反应混合物分离成酸性水相和有机相 含有硝基芳族化合物c）洗涤有机相以纯化硝基芳族化合物，d）在催化剂存在下氢化硝基芳族化合物以产生芳族胺和反应水，e） 将步骤d）中形成的反应的水与芳族胺分离，其中步骤e）中分离的反应水用于洗涤步骤c）中含有硝基芳族化合物的有机相。

    Process for the preparation of diphenyl ether compounds
    44.
    发明授权
    Process for the preparation of diphenyl ether compounds 失效
    二苯醚化合物的制备方法

    公开(公告)号：US06790991B2

    公开(公告)日：2004-09-14

    申请号：US10168611

    申请日：2002-06-20

    Applicant: Stephen Martin Brown ,  Brian David Gott ,  James Peter Muxworthy

    Inventor： Stephen Martin Brown ,  Brian David Gott ,  James Peter Muxworthy

    IPC: C07C30300

    CPC classification number: C07C201/08 ,  C07C303/40 ,  C07C311/51 ,  C07C205/59

    Abstract: A process for producing fomesafen from acifluorfen comprises the steps of (a) converting acifluorfen to its acid chloride, (b) coupling the acid chloride so formed with methanesulphonamide to form crude fomesafen and (c) purifying the crude fomesafen, characterized in that each of the steps is carried out in a single common solvent, which is preferably a chloroalkane. Preferably the steps are telescoped together so that there is no isolation of the product for any step until fomesafen is obtained.

    Abstract translation: 从氟锁草醚生产福莫斯芬的方法包括以下步骤：（a）将氟锁草醚转化为酰氯，（b）将形成的酰氯与甲磺酰胺反应形成粗制甲磺酸盐，（c）纯化粗制物，其特征在于， 该步骤在单一的普通溶剂中进行，其优选为氯代烷烃。 优选地，这些步骤被伸缩在一起，使得在获得fomesafen之前，没有任何步骤的产品被隔离。

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