中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

332 records (took 0.016 seconds)

    Process for the production of dinitrobenzene and mononitrobenzene
    91.
    发明授权
    Process for the production of dinitrobenzene and mononitrobenzene 失效
    生产二硝基苯和单硝基苯的方法

    公开(公告)号：US5488187A

    公开(公告)日：1996-01-30

    申请号：US290575

    申请日：1994-08-15

    Applicant: Robert W. Mason

    Inventor： Robert W. Mason

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

    CPC classification number: C07C201/08 ,  C07C201/16

    Abstract: Aromatic nitration reactions and, more specifically, a process for nitrating benzene to produce dinitrobenzene or mononitrobenzene in the absence of sulfuric acid and in the absence of any dipolar aprotic solvent.

    Abstract translation: 更具体地说，是在不存在硫酸的情况下和在不存在任何偶极非质子溶剂的情况下硝化苯以产生二硝基苯或单硝基苯的方法。

    Process for the preparation of dinitrotoluene
    92.
    发明授权
    Process for the preparation of dinitrotoluene 失效
    制备二硝基甲苯的方法

    公开(公告)号：US5345012A

    公开(公告)日：1994-09-06

    申请号：US147654

    申请日：1993-11-03

    Applicant: Thomas Schieb ,  Gerhard Wiechers ,  Rudolf Sundermann ,  Uwe Zarnack

    Inventor： Thomas Schieb ,  Gerhard Wiechers ,  Rudolf Sundermann ,  Uwe Zarnack

    IPC: C07C201/08 ,  C07C205/06

    CPC classification number: C07C201/08

    Abstract: A continuous process for the preparation of isomeric mixtures of dinitrotoluene by a single stage nitration of toluene under adiabatic conditions. The reaction enthalpy is used for the removal by distillation of the water of reaction formed during nitration. In this process, toluene is reacted with a nitrating acid having from about 80 to about 100% by weight of an inorganic component having a specified composition and from about 0 to about 20% by weight of an organic component having a specified composition.

    Abstract translation: 在绝热条件下通过单阶段甲苯硝化甲苯制备二硝基甲苯的异构体混合物的连续方法。 反应焓用于通过蒸馏除去硝化过程中形成的反应的水。 在该方法中，甲苯与具有约80至约100重量％的具有指定组成的无机组分和约0至约20重量％的具有指定组成的有机组分的硝酸反应。

    Process for preparing dinitrotoluene with low by-product content
    94.
    发明授权
    Process for preparing dinitrotoluene with low by-product content 失效
    制备低副产物含量的二硝基甲苯的方法

    公开(公告)号：US5245092A

    公开(公告)日：1993-09-14

    申请号：US944639

    申请日：1992-09-14

    Applicant: Allen B. Quakenbush

    Inventor： Allen B. Quakenbush

    IPC: C07C205/06 ,  C07C201/08

    CPC classification number: C07C201/08

    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。

    Regioselective nitration of diphenyl compounds
    96.
    发明授权
    Regioselective nitration of diphenyl compounds 失效
    二苯基化合物的区域选择性硝化

    公开(公告)号：US5037994A

    公开(公告)日：1991-08-06

    申请号：US477243

    申请日：1990-02-08

    Applicant: Allen B. Mossman ,  Weilong L. Chiang

    Inventor： Allen B. Mossman ,  Weilong L. Chiang

    IPC: C07C201/08 ,  C07C205/06 ,  C07C205/11 ,  C07C205/38 ,  C07C205/43 ,  C07C205/45 ,  C07C209/36

    CPC classification number: C07C209/36 ,  C07C2/861 ,  C07C201/08

    Abstract: A regioselective nitration process for diphenyl compounds which can be carried out at about ambient temperature in which each ring of the diphenyl compound is selectively nitrated in the para position to form the corresponding di(4-nitrophenyl) compound. Such compounds as diphenyl carbonate, 2,2-diphenylpropane, 2,2-diphenylhexafluoropropane, diphenyl sulfide, diphenyl ketone, diphenyl sulfone, and the like can be converted to an isomeric mixture containing an enhanced amount of the corresponding di(4-nitrophenyl) compound, which mixture may be reduced or purified and reduced to the di(4-aminophenyl) analogues for use in the manufacture of polyamides, polyimides, and polyamide-imides.

    Abstract translation: 二苯基化合物的区域选择性硝化方法，其可以在约环境温度下进行，其中每个环的二苯基化合物在对位选择性硝化以形成相应的二（4-硝基苯基）化合物。 作为碳酸二苯酯，2,2-二苯基丙烷，2,2-二苯基六氟丙烷，二苯基硫醚，二苯基酮，二苯基砜等的化合物，可以转化成含有相应的二（4-硝基苯基） 化合物，该混合物可以被还原或纯化并还原成二（4-氨基苯基）类似物，用于制造聚酰胺，聚酰亚胺和聚酰胺 - 酰亚胺。

    Laser-induced nitration
    98.
    发明授权
    Laser-induced nitration 失效
    激光诱导硝化

    公开(公告)号：US4908110A

    公开(公告)日：1990-03-13

    申请号：US340815

    申请日：1989-04-17

    Applicant: Ann E. Stanley ,  Susan E. Godbey

    Inventor： Ann E. Stanley ,  Susan E. Godbey

    IPC: B01J19/12 ,  C07C201/08 ,  C07C205/02

    CPC classification number: B01J19/121 ,  C07C201/08 ,  C07C205/02

    Abstract: Infrared laser-induced production of nitrated products is achieved by irradiating compounds selected from propane, n-butane, isobutane, n-pentane, and cyclopropane in the gas phase while in a stainless steel cell 5.times.5.times.10 cm equipped with zinc selenide windows to admit the infrared laser radiation in the range of 10.4 or 9.4 micrometers provided by a continuous wave CO.sub.2 laser. KC1 windows on the short path are to monitor infrared spectra of reactants and products. Nitrogen dioxide or nitric acid is present as the second reactant and the nitrating agent. The infrared laser-induced method far exceeds the yield of nitrated products found in the argon-ion laser-induced nitration of isobutane reported in the literature. Applicants' method at least equals the yield from thermally activated systems with a minimum formation of undesirable side products. A representative sample, 220 torr of gaseous butane, and 20 torr NO.sub.2 is irradiated in one experiment for 30 seconds with 75 W/cm.sup.2 at a frequency of 956 cm.sup.-1. About 40% of the NO.sup.2 is converted to nitrocompounds. Identified as nitro-products are nitromethane, nitroethane, 1-nitropropane, 1-nitrobutane and 2-nitrobutane. More than 60% of the nitro-products are in the long chain forms, 1-nitrobutane and 2-nitrobutane. Pressure of the NO.sub.2 reactant range from about 20 to 30 torr while the hydrocarbon reactant pressure range from about 200 to about 500 torr. Irradiation times ranges from about 30 to about 60 seconds. Laser powers range from 75 watts/cm.sup.2 to about 82 watts/cm.sup.2.

    Abstract translation: 通过在气相中照射选自丙烷，正丁烷，异丁烷，正戊烷和环丙烷的化合物来实现硝化产物的红外激光诱导产生，同时在5×5×10cm的装有硒化锌窗口的不锈钢电池中容纳红外线 激光辐射范围为10.4或9.4微米，由连续波CO2激光器提供。 短路上的KC1窗口是监测反应物和产物的红外光谱。 存在二氧化氮或硝酸作为第二反应物和硝化剂。 红外激光诱导的方法远远超过文献报道的氩离子激光诱导的异丁烷硝化中发现的硝化产物的产率。 申请人的方法至少等于热活化系统的产量，最少形成不希望的副产品。 一个代表性的样品，220托的气态丁烷和20托的NO 2在一个实验中以75W / cm 2的频率在956cm -1处照射30秒。 约40％的NO2转化为硝基化合物。 硝基甲烷，硝基乙烷，1-硝基丙烷，1-硝基丁烷，2-硝基丁烷等。 硝基产物超过60％是长链形式，1-硝基丁烷和2-硝基丁烷。 NO 2反应物的压力范围为约20至30托，而烃反应物压力范围为约200至约500托。 照射时间范围为约30至约60秒。 激光功率范围为75瓦特/平方厘米至约82瓦特/平方厘米。

    Method of preparing 4-trifluoromethyl-2-nitrobenzoic acid and novel isomer
    100.
    发明授权
    Method of preparing 4-trifluoromethyl-2-nitrobenzoic acid and novel isomer 失效
    制备4-三氟甲基-2-硝基苯甲酸和新异构体的方法

    公开(公告)号：US4845279A

    公开(公告)日：1989-07-04

    申请号：US136715

    申请日：1987-12-22

    Applicant: Yasunori Nishimura ,  Yoshihiko Gotoh ,  Toshikazu Kawai

    Inventor： Yasunori Nishimura ,  Yoshihiko Gotoh ,  Toshikazu Kawai

    IPC: C07B63/02 ,  C07C67/00 ,  C07C201/00 ,  C07C201/08 ,  C07C201/16 ,  C07C205/58

    CPC classification number: C07C201/16 ,  C07C205/58

    Abstract: An isomer mixture of 4-trifluoromethyl-2-nitrobenzoic acid and 4-trifluoromethyl-3-nitrobenzoic acid, which is a novel compound, is obtained by nitrating a compound represented by ##STR1## (Z is COY or CY.sub.3, and Y is a halogen atom) with a nitrating agent comprising nitric acid and simultaneously hydrolyzing the radical Z. Each of the two isomers is easily isolated by treating the mixture with a basic neutralizing agent to obtain a solution containing the 2-nitro isomer and a precipitate containing the 3-nitro isomer.

    Abstract translation: 通过将由下式表示的化合物（Z是COY或CY3，Y是一个或多个）来获得，作为新化合物的4-三氟甲基-2-硝基苯甲酸和4-三氟甲基-3-硝基苯甲酸的异构体混合物 卤素原子）与含硝酸的硝化剂同时水解基团Z.通过用碱性中和剂处理混合物容易地分离出两种异构体，得到含有2-硝基异构体的溶液和含有3 - 硝基异构体。

Patent Agency Ranking