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    EXHAUST GAS CLEANING IN A METHOD FOR CONTINUOUSLY PRODUCING DINITROTOLUENE
    271.
    发明申请
    EXHAUST GAS CLEANING IN A METHOD FOR CONTINUOUSLY PRODUCING DINITROTOLUENE 有权

    公开(公告)号：US20170291869A1

    公开(公告)日：2017-10-12

    申请号：US15514107

    申请日：2015-09-29

    Applicant: Covestro Deutschland AG

    Inventor： Thomas KNAUF ,  Jürgen MÜNNIG ,  Wolfgang LORENZ ,  Bernd PENNEMANN

    IPC: C07C201/08 ,  C07C201/16 ,  B01D53/00

    CPC classification number: C07C201/08 ,  B01D53/002 ,  B01D2257/7027 ,  C07C201/16 ,  C07C205/06

    Abstract: The invention relates to a method for producing dinitrotoluene, comprising the following steps: a) nitrating toluene with a mixture of nitric acid and sulfuric acid and subsequently separating a sulfuric-acid-containing aqueous phase that arises in the nitration, wherein a raw dinitrotoluene is obtained, b) washing the raw dinitrotoluene in a water wash with neutral and/or alkaline washing water, wherein a pre-cleaned dinitrotoluene, which contains at least water in addition to dinitrotoluene, is obtained after the washing water used in the last wash has been separated, and c) separating the water from the pre-cleaned dinitrotoluene, d) collecting the waste water from steps a), b), and/or c), e) optionally extracting the collected waste water from step d) with toluene and returning the thus obtained organic phase to step a), f) freeing the collected waste water from step d), or, if the optional step e) is performed, the extracted waste water from step e), of toluene in a toluene stripper, wherein a toluene-containing exhaust gas flow is obtained, g) feeding at least one exhaust gas flow from steps a), b), c), d), e), or f) into an exhaust gas condenser and removing the toluene contained in the at least one exhaust gas flow in said exhaust gas condenser, wherein the method comprises the following further step: h) feeding the exhaust gas flow arising in step g) after the condensing out of the toluene to a thermal exhaust air cleaning, wherein nitrogen is added to the exhaust gas flow to be fed to the exhaust gas condenser or to the exhaust gas flow leaving the exhaust gas condenser, wherein preferably a nitrogen concentration in the exhaust gas flow of at least 0.1 vol % is set, especially preferably of at least 0.5 vol %.

    Process for the preparation of nitrobenzene by adiabatic nitration
    273.
    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：US09302978B1

    公开(公告)日：2016-04-05

    申请号：US14785763

    申请日：2014-04-24

    Applicant: Covestro Deutschland AG

    Inventor： Antoni Mairata ,  Thomas Knauf

    IPC: C07C205/00 ,  C07C201/08 ,  C07C201/16

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

    Abstract: The present invention relates to a continuously operated adiabatic process for the preparation of nitrobenzene by nitration of benzene with nitric acid and sulfuric acid, in which the dilute sulfuric acid obtained after the nitration has taken place and the crude nitrobenzene has been separated off from the aqueous phase is concentrated for the purpose of re-use in the nitration, and after its concentration, at least one minute before it comes into contact with fresh nitric acid again an oxidizing agent is added such that a concentration of the oxidizing agent of from 10 ppm to 5,000 ppm, based on the total weight of the concentrated sulfuric acid to be recycled into the nitration, is established.

    Abstract translation: 本发明涉及用硝酸和硫酸硝化苯来制备硝基苯的连续操作的绝热方法，其中在硝化发生后获得的稀硫酸和粗硝基苯已从水溶液中分离出来 浓缩的浓度是为了在硝化中重复使用，并且在其浓缩之后，再次与新鲜硝酸接触至少一分钟，加入氧化剂使得氧化剂的浓度为10ppm 至5,000ppm，基于要再循环到硝化中的浓硫酸的总重量。

    Process for the production of nitrobenzene by adiabatic nitration
    274.
    发明授权
    Process for the production of nitrobenzene by adiabatic nitration 有权
    通过绝热硝化生产硝基苯的方法

    公开(公告)号：US09284256B2

    公开(公告)日：2016-03-15

    申请号：US14415794

    申请日：2013-07-23

    Applicant: Bayer MaterialScience AG

    Inventor： Thomas Knauf ,  Michael Merkel

    IPC: C07C201/00 ,  C07C201/08 ,  C07C201/16

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

    Abstract: The present invention provides a continuous process for the production of nitrobenzene by nitration of benzene with mixtures of sulfuric and nitric acid using a stoichiometric excess of benzene, in which the content of aliphatic organic compounds in the feed benzene during the start-up period of the production plant is always maintained at less than 1.5 wt. %, based on the total mass of the feed benzene. This is achieved either by mixing the feed benzene comprising recycled unreacted benzene (recycled benzene) and benzene newly supplied to the reaction (fresh benzene) in appropriate quantitative ratios during the start-up period, depending on the purity of the two streams, or by completely omitting the recycling of unreacted benzene during the start-up period, i.e. the feed benzene consists only of benzene newly supplied to the reaction.

    Abstract translation: 本发明提供了一种使用化学计量过量的苯硝化苯与硫酸和硝酸的混合物来生产硝基苯的连续方法，其中在起始时期的进料苯中的脂族有机化合物的含量 生产厂总是维持在1.5重量％以下。 ％，基于进料苯的总质量。 这可以通过在启动期间将包含再循环的未反应苯（再循环苯）和新提供给反应的苯（新鲜苯）的进料苯与合适的定量比例混合，取决于两个流的纯度，或者通过 在启动期间完全省略未反应苯的再循环，即进料苯仅由新提供给反应的苯组成。

    Continuous two step flow synthesis of M-amino acetophenone
    278.
    发明授权
    Continuous two step flow synthesis of M-amino acetophenone 有权
    连续两步流程合成M-氨基苯乙酮

    公开(公告)号：US09150497B2

    公开(公告)日：2015-10-06

    申请号：US14351791

    申请日：2012-10-15

    Applicant: COUNCIL OF SCIENTIFIC & INDUSTRIAL RESEARCH

    Inventor： Amol Arvind Kulkarni ,  Ramesh Anna Joshi ,  Rohini Ramesh Joshi

    IPC: C07C209/00 ,  C07C221/00 ,  C07C201/08

    CPC classification number: C07C221/00 ,  C07C201/08 ,  C07C205/45 ,  C07C225/22

    Abstract: Disclosed herein is a continuous tubular reactor based conversion of acetophenones to amino substituted acetophenones wherein the nitration is carried out at −10 to 10° C. followed by reduction to m-nitrophenone resulting in uniform output of product, said process comprising the steps of: a) Nitrating acetophenone with nitrating agent (nitration mixture or fuming nitric acid) at −10 to 10° C.; b) Isolating m-nitro acetophenone from a mixture of o and m-nitro acetophenone and c) Reducing the m-nitro to obtain m-amino acetophenone.

    Abstract translation: 本文公开了一种连续的基于管式反应器的苯乙酮转化为氨基取代的苯乙酮，其中硝化在-10至10℃下进行，随后还原为间硝基苯酮，导致产物的均匀输出，所述方法包括以下步骤： a）在-10至10℃下用硝化剂（硝化混合物或发烟硝酸）将苯乙酮硝化。 b）从间硝基苯乙酮的混合物中分离间硝基苯乙酮，和c）还原间硝基以获得间氨基苯乙酮。

    Process for the preparation of anagrelide and analogues thereof
    280.
    发明授权
    Process for the preparation of anagrelide and analogues thereof 有权
    制备阿那格雷及其类似物的方法

    公开(公告)号：US09067944B2

    公开(公告)日：2015-06-30

    申请号：US13878651

    申请日：2011-10-21

    Applicant: Paul McGee

    Inventor： Paul McGee

    IPC: C07D487/04 ,  C07C201/08 ,  C07C227/18

    CPC classification number: C07D487/04 ,  C07C201/08 ,  C07C227/18 ,  C07C205/44 ,  C07C229/14

    Abstract: The present invention relates to a novel process for producing anagrelide, 6,7-dichloro-1,5-dihydroimidazo[2,1-b]quinazolin 2(3H)-one, or certain analogs thereof. The process of the invention also provides improved processes for producing key intermediates required for the synthesis of anagrelide or certain analogs thereof.

    Abstract translation: 本发明涉及一种制备阿那格雷，6,7-二氯-1,5-二氢咪唑并[2,1-b]喹唑啉2（3H） - 酮或其某些类似物的新方法。 本发明的方法还提供了用于生产合成阿那格雷或其某些类似物所需的关键中间体的改进方法。

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