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    DECOMPOSITION OF AROMATIC NITRO COMPOUND IN WASTE WATER
    1.
    发明专利
    DECOMPOSITION OF AROMATIC NITRO COMPOUND IN WASTE WATER 失效

    公开(公告)号：JPH11319800A

    公开(公告)日：1999-11-24

    申请号：JP9894699

    申请日：1999-04-06

    Applicant: BASF AG

    Inventor： PAPKALLA THOMAS ,  BAUR KARL GERHARD DR ,  LANGENSIEPEN HANS-WERNER DR ,  MACKENROTH WOLFGANG

    IPC: A62D3/40 ,  A62D101/26 ,  A62D101/28 ,  C02F1/02 ,  C02F1/58

    Abstract: PROBLEM TO BE SOLVED: To decompose different aromatic nitro compounds in waste water as many as possible in a single process when decomposing nitro compounds in the waste water and a mixture of more than two these compounds, by using at least one aromatic nitro compound not having a hydroxyl group in its aromatic ring. SOLUTION: Waste water is thermally decomposed in a pressure vessel under such a condition that temperature is 150-350 deg.C, favorably 250-320 deg.C, pressure is 10-300 bars, favorably 40-250 bars, and the pH of the waste water is 7-14, favorably 10-13. The temperature of the waste water is adjusted so that nitroaromatic compounds with low solubility do not form an organic phase. The amount of the nitro compound with low solubility in water is adjusted according to the temperature of the waste water preferably of 40-80 deg.C. Thereby, the aromatic nitro compounds having no hydroxyl group and the nitro hydroxy aromatic compounds in the waste water can be decomposed at the same time in a single process.

    3.
    发明专利
    未知

    公开(公告)号：BRPI0507293B1

    公开(公告)日：2014-05-20

    申请号：BRPI0507293

    申请日：2005-02-02

    Applicant: BASF AG

    Inventor： BUETTNER JOHANNES ,  MACKENROTH WOLFGANG ,  GEBAUER JUERGEN ,  HERMANN HEINRICH ,  KONIECZNY PETER

    IPC: C07C201/08 ,  C07C205/06

    Abstract: The present invention provides a process for preparing dinitrotoluene, comprising the steps of a) reacting toluene with nitric acid in the presence of sulphuric acid to give mononitrotoluene, b) separating the reaction product from step a) into an organic phase comprising mononitrotoluene and an aqueous phase comprising sulfuric acid, c) reacting the organic phase comprising mononitrotoluene with nitric acid in the presence of sulphuric acid to give dinitrotoluene, d) separating the reaction product from step c) into an organic phase comprising dinitrotoluene and an aqueous phase comprising sulfuric acid, wherein the reaction product from step a) has a content of toluene of from 3.0 to 8% by weight, based on the organic phase, and a content of nitric acid of from 0.1 to 1.2% by weight, based on the aqueous phase, and the phase separation in step b) is effected in such a way that further reaction of the toluene with the nitric acid is prevented.

    4.
    发明专利
    未知

    公开(公告)号：DE50304616D1

    公开(公告)日：2006-09-21

    申请号：DE50304616

    申请日：2003-12-13

    Applicant: BASF AG

    Inventor： SOHN MARTIN ,  STROEFER ECKHARD ,  NEVEJANS FILIP ,  PENZEL ULRICH ,  PALLASCH HANS-JUERGEN ,  VAN DEN ABEEL PETER ,  DEBERDT FILIP ,  JACOBS JAN D ,  MACKENROTH WOLFGANG

    IPC: C07C263/20

    Abstract: The invention relates to a process for preparing isocyanates by reaction of amines with phosgene in the presence of inert organic solvents in a reactor and subsequent work-up of the reaction mixture leaving the reactor, wherein the solvent is separated off in a two-stage or multistage, preferably two-stage, distillation process in which the solvent is separated off at a pressure of 0.1-15 bar in a first apparatus and at 1-900 mbar in a second apparatus or further apparatuses, with the heat of condensation of the solvent vapor from the first apparatus being used for partial or complete vaporization of solvent in the second apparatus.

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