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    METHOD FOR PRODUCING NITROBENZENE
    74.
    发明申请
    METHOD FOR PRODUCING NITROBENZENE 审中-公开

    公开(公告)号：US20200017434A1

    公开(公告)日：2020-01-16

    申请号：US16491287

    申请日：2018-03-05

    Applicant: Covestro Deutschland AG

    Inventor： Denise Chan ,  Thomas Knauf ,  Juergen Muennig

    IPC: C07C201/08 ,  C07C201/16

    Abstract: The invention relates to a method for continuous production of nitrobenzene by means of nitration of benzene with nitric acid and sulfuric acid, in which load change (i.e. a reduction or increase in the quantity of nitric acid supplied to the process per time interval) is particularly advantageously developed. The invention particularly relates to a method in which, in the case of a load reduction, the ratio of the masses of benzene and nitric acid supplied per time interval is significantly increased compared to said ratio before the load change and/or the ratio of the masses of nitric acid and sulfuric acid supplied per time interval is significantly reduced compared to said ratio before the load change. In the event of a load increase, the reverse is carried out.

    NITRATION OF AROMATIC COMPOUNDS
    76.
    发明申请
    NITRATION OF AROMATIC COMPOUNDS 审中-公开

    公开(公告)号：US20180179144A1

    公开(公告)日：2018-06-28

    申请号：US15550233

    申请日：2016-01-18

    Applicant: Arizona Board of Regents for the University of Arizona

    Inventor： Bhumasamudram Jagadish ,  Eugene Mash

    IPC: C07C201/08 ,  C07C201/16

    Abstract: The present invention provides a process for nitrating aromatic compounds without the need for a solid catalyst and/or any organic solvents and/or any other additives. A typical process includes combining or admixing a nitric acid and an anhydride compound under conditions sufficient to produce a reactive intermediate. The aromatic compound to be nitrated is then added to this reactive intermediate to produce a nitroaromatic compound. The nitroaromatic compound can be substituted with one or more, typically, one to three, and often one or two nitrate (—NO2) groups.

    Exhaust gas cleaning in a method for continuously producing dinitrotoluene
    79.
    发明授权
    Exhaust gas cleaning in a method for continuously producing dinitrotoluene 有权

    公开(公告)号：US09896407B2

    公开(公告)日：2018-02-20

    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 ,  C07C205/06 ,  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 %.

    EXHAUST GAS CLEANING IN A METHOD FOR CONTINUOUSLY PRODUCING DINITROTOLUENE
    80.
    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 %.

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