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    Treatment/removal of byproduct aqueous effluents comprising hydroxynitro-aromatic compounds
    97.
    发明授权
    Treatment/removal of byproduct aqueous effluents comprising hydroxynitro-aromatic compounds 失效
    包含羟基硝基芳族化合物的副产物含水废水的处理/除去

    公开(公告)号：US5820764A

    公开(公告)日：1998-10-13

    申请号：US959731

    申请日：1997-10-28

    Applicant: Faouzi Joulak ,  Louis Le Bris ,  Philippe Marion

    Inventor： Faouzi Joulak ,  Louis Le Bris ,  Philippe Marion

    IPC: C02F1/66 ,  C02F9/00 ,  C07C201/16 ,  C02F1/52

    CPC classification number: C02F1/66 ,  C07C201/16 ,  C02F2103/36 ,  Y10S210/909

    Abstract: Objectionable byproduct aqueous effluents containing contaminating amounts of hydroxynitroaromatic compounds, in particular those aqueous effluents produced during the synthesis of nitroaromatic compounds, e.g., dinitrotoluenes, via reaction of an aromatic compound with nitric acid in the presence of sulfuric acid, are efficiently, facilely and economically treated/removed by (a) intimately contacting a mixture of at least one nitroaromatic compound and at least one hydroxynitroaromatic compound with an aqueous wash medium containing a neutralizing agent, (b) separating the resulting admixture into an organic phase and an aqueous phase, (c) recycling a fraction of the separated aqueous phase to the aqueous wash medium to thus constitute a portion thereof, and (d) periodically draining a fraction of the wash medium, whether to destruction thereof or to waste.

    Abstract translation: 含有污染量的羟基硝基芳族化合物的有害副产物含水废水，特别是在硫酸存在下通过芳族化合物与硝酸的反应合成硝基芳族化合物（例如二硝基甲苯）期间产生的含水废水，是有效，便利和经济的 通过（a）使至少一种硝基芳族化合物和至少一种羟基硝基芳族化合物的混合物与含有中和剂的水性洗涤介质紧密接触来处理/除去，（b）将所得混合物分离成有机相和水相（ c）将分离的水相的一部分循环到水性洗涤介质中，从而构成其一部分，和（d）定期排出洗涤介质的一部分，不管其是否破坏或浪费。

    Process for the production of dinitrotoluene and isomeric mixtures of dinitrotoluene
    98.
    发明授权
    Process for the production of dinitrotoluene and isomeric mixtures of dinitrotoluene 失效
    制备二硝基甲苯和二硝基甲苯异构体混合物的方法

    公开(公告)号：US5663462A

    公开(公告)日：1997-09-02

    申请号：US657513

    申请日：1996-06-04

    Applicant: Uwe Klingler ,  Thomas Schieb ,  Gerhard Wiechers

    Inventor： Uwe Klingler ,  Thomas Schieb ,  Gerhard Wiechers

    IPC: C07C201/08 ,  C07C201/16 ,  C07C205/06

    CPC classification number: C07C201/08

    Abstract: Dinitrotoluene and isomer mixtures of dinitrotoluene are produced in a single stage, continuous process by nitrating mononitrotoluene or an isomer mixture of mononitrotoluene in which the ortho-mononitrotoluene content is low with a nitrating acid made up of (1) from about 80 to about 100 wt. % inorganic constituents and (2) up to 20 wt. % organic constituents. The inorganic constituents of the nitrating acid include: (a) from about 60 to about 90 wt. % sulfuric acid, (b) from about 1 to about 20 wt. % nitric acid, and (c) at least 5 wt. % water. The organic constituents of the nitrating acid include: from about 70 to about 100% by weight nitrotoluene isomers and up to about 30% by weight nitration by-products. The nitration reaction is carrier out under adiabatic conditions. The molar ratio of nitric acid to mononitrotoluene during the nitration reaction is generally from about 0.7:1 to about 1.4:1. The phases generated during the nitration are subsequently separated and the acid phase is treated to remove at least 5 wt. % of the water present therein. The water may be removed by distillation or flash vaporization, optionally with simultaneous heat supply. After removal of the water, nitric acid having a concentration of from about 50 to about 100 wt. % is added to the treated acid phase in amount sufficient to satisfy the compositional limits for a nitrating acid useful in the process of the present invention. This reconcentrated acid phase is then returned to the nitration reaction.

    Abstract translation: 二硝基甲苯和二硝基甲苯的异构体混合物通过硝化单硝基甲苯或单硝基甲苯的异氰酸甲酯的异构体混合物在单一阶段中生产，其中邻硝基甲苯含量低于由（1）约80至约100重量％ 。 ％无机成分和（2）最多20重量％ ％有机成分。 硝酸的无机组分包括：（a）约60至约90wt。 ％硫酸，（b）约1至约20wt。 ％硝酸，和（c）至少5wt。 ％ 水。 硝酸的有机成分包括：约70至约100重量％的硝基甲苯异构体和至多约30重量％的硝化副产物。 硝化反应在绝热条件下载运。 在硝化反应期间硝酸与单硝基甲苯的摩尔比通常为约0.7:1至约1.4:1。 随后分离硝化过程中产生的相，并处理酸相以除去至少5wt。 存在于其中的水的百分比。 水可以通过蒸馏或闪蒸除去，任选地同时供热。 除去水后，浓度为约50至约100wt。 以足以满足本发明方法中有用的硝酸的组成限度的量将经加入的酸相中的％加入到处理的酸相中。 然后将该再浓缩的酸相返回到硝化反应。

    Changing the regiopurity of mixtures containing 4,4'-disubstituted diphenyl carbonates
    100.
    发明授权
    Changing the regiopurity of mixtures containing 4,4'-disubstituted diphenyl carbonates 失效
    改变含有4,4'-二取代碳酸二苯酯的混合物的体积

    公开(公告)号：US5221798A

    公开(公告)日：1993-06-22

    申请号：US437102

    申请日：1989-11-16

    Applicant: Allen B. Mossman

    Inventor： Allen B. Mossman

    IPC: C07C68/08 ,  C07C201/16 ,  C07C205/43

    CPC classification number: C07C68/08 ,  C07C201/16

    Abstract: The 4,2'-disubstituted diphenyl carbonate or, optionally, ether content of regioimpure mixtures of compounds of formula: ##STR1## where X is F, Cl, and NO.sub.2, can be decreased to essentially zero starting with o-, m- and p-containing regioimpure mixtures by treating with the corresponding m- or p-substituted phenol and, optionally, a decarboxylation catalyst and removing the o-substituted phenol produced by volatilization or recrystallization from a solvent.

    Abstract translation: 其中X为F，Cl和NO 2的式（ⅩⅥ）化合物的4,2'-二取代的碳酸二苯酯或任选的醚的混合物可以以o-，m-和 通过用相应的m-或p-取代的苯酚和任选的脱羧催化剂处理除去由溶剂挥发或重结晶产生的O-取代的苯酚的含p-区域混合物。

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