A PROCESS FOR PREPARING DINITROTOLUENE
    541.
    发明申请
    A PROCESS FOR PREPARING DINITROTOLUENE 审中-公开
    一种制备食品加工剂的方法

    公开(公告)号:WO1994006751A1

    公开(公告)日:1994-03-31

    申请号:PCT/US1993008135

    申请日:1993-08-30

    CPC classification number: C07C201/08 C07C205/06

    Abstract: Process for preparing dinitrotoluene by reacting toluene with concentrated nitric acid. The process reacts toluene with a large excess of concentrated nitric acid at selected conditions to produce a product which has substantially reduced by-product content.

    Abstract translation: 通过甲苯与浓硝酸反应制备二硝基甲苯的方法。 该方法在选定的条件下使甲苯与大量浓缩的硝酸反应,以产生具有显着降低的副产物含量的产物。

    A PROCESS FOR PREPARING DINITROTOLUENE
    542.
    发明申请
    A PROCESS FOR PREPARING DINITROTOLUENE 审中-公开
    一种制备二硝基甲苯的方法

    公开(公告)号:WO1992011228A1

    公开(公告)日:1992-07-09

    申请号:PCT/US1991007804

    申请日:1991-10-24

    CPC classification number: C07C201/08 C07C205/06

    Abstract: Described herein is a continuous one pot process for the production of dinitrotoluene by: a) reacting toluene with concentrated nitric acid to produce a product mixture containing dinitrotoluene, unreacted nitric acid and water; b) then mixing the product mixture from step (a) with a substantially dehydrated molten nitrate salt; c) then adding additional nitric acid to the mixture of step (b); d) then separating nitric acid from the mixture from step c) in the form of a vapor to form a two phase liquid mixture; e) then separating the dinitrotoluene phase from the liquid hydrated salt phase; f) then treating the acid vapor from step d) and the hydrated salt-liquid phase of step (e) to separate and concentrate nitric acid for recycle to step (a); g) dehydrating the nitrate salt solution; and h) recycling the dehydrated nitrate salt to step (b).

    Abstract translation: 一种生产单一的二硝基甲苯容器的连续方法,包括:a)使甲苯与浓硝酸反应,生成含有二硝基甲苯,未反应的硝酸和 水; b)然后将步骤(a)的产物混合物与基本上脱水的熔融硝酸盐混合; c)然后向步骤(b)的混合物中加入另外的硝酸; d)随后将蒸汽形式的步骤(c)的混合物中的硝酸分离以形成两相液体混合物; e)随后从液体水合盐相中分离二硝基甲苯相; f)此后处理步骤(d)的酸蒸气以及步骤(e)的液体水合盐相以分离和浓缩硝酸以再循环到 步骤(a); g)使硝酸盐溶液脱水; 和h)将脱水的硝酸盐再循环至步骤(b)。

    PROCESS FOR THE PRODUCTION OF DINITROTOLUENE OR MONONITROBENZENE
    545.
    发明申请
    PROCESS FOR THE PRODUCTION OF DINITROTOLUENE OR MONONITROBENZENE 审中-公开
    生产西硝基苯甲酸或单硝酸根的方法

    公开(公告)号:WO1989012620A1

    公开(公告)日:1989-12-28

    申请号:PCT/US1989002635

    申请日:1989-06-14

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

    Abstract: Aromatic nitration reactions and, more specifically, a process for nitrating toluene to dinitrotoluene or benzene to mononitrobenzene. Since mononitrobenzene is useful in producing MDI and since dinitrotoluene is useful as an intermediate in producing TDI, new processes for the selective manufacture of these intermediates would be highly desirable to the polyisocyanate manufacturing community.

    Abstract translation: 更具体地说,是将甲苯硝化成二硝基甲苯或苯到一硝基苯的方法。 由于单硝基苯可用于制备MDI,并且由于二硝基甲苯可用作制备TDI的中间体,因此选择性制备这些中间体的新方法对多异氰酸酯制造社区是非常需要的。

    NITRATION OF BENZENE OR TOLUENE IN A MOLTEN NITRATE SALT
    546.
    发明申请
    NITRATION OF BENZENE OR TOLUENE IN A MOLTEN NITRATE SALT 审中-公开
    硝酸盐在硝酸盐中的硝化作用

    公开(公告)号:WO1989007095A1

    公开(公告)日:1989-08-10

    申请号:PCT/US1988004389

    申请日:1988-12-12

    CPC classification number: C07C201/08 C07C205/06

    Abstract: This invention relates to the nitration of benzene or toluene, and more specifically to such a reaction in a molten nitrate salt medium. The molten salt medium is selected from the group consisting of molten nitrate salts of sodium, potassium, lithium, and mixtures thereof. The reaction is conducted in the vapor phase at a reaction temperature of between about 150 DEG C and about 250 DEG C and at a reaction pressure of between about 100 mm of Hg and about one atmosphere for a reaction time not exceeding one hour.

    Abstract translation: 本发明涉及苯或甲苯的硝化,更具体地说涉及硝酸盐熔盐介质中的这种反应。 熔盐介质选自钠,钾,锂的熔融硝酸盐及其混合物。 反应在气相中在约150℃至约250℃的反应温度和约100mm Hg的反应压力和约一个大气压下进行反应时间不超过1小时。

    PROCESS FOR PREPARING 4,6-DINITRORESORCINOL
    547.
    发明申请
    PROCESS FOR PREPARING 4,6-DINITRORESORCINOL 审中-公开
    制备4,6-DINITRORESORCINOL的方法

    公开(公告)号:WO1988005038A1

    公开(公告)日:1988-07-14

    申请号:PCT/US1988000016

    申请日:1988-01-06

    CPC classification number: C07C201/08 C07C205/23

    Abstract: A method of nitrating resorcinol which is selective for the production of the 4,6-dinitroresorcinol isomer. A resorcinol-based starting material is admixed with a nitrating solution from which substantially all nitrogen dioxide and nitrous has been removed. The nitrating solution contains white fuming nitric acid, a nitrosonium ion control agent such as urea, and, optionally, concentrated sulfuric acid. The 4,6-dinitroresorcinol isomer is provided in yields of about 65-85 % with minimal production of undesirable side products.

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