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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.

    PROCESS FOR PREPARING ALKYL ESTERS OF (METH)ACRYLIC ACID
    2.
    发明专利
    PROCESS FOR PREPARING ALKYL ESTERS OF (METH)ACRYLIC ACID 未知

    公开(公告)号：CZ273496A3

    公开(公告)日：1998-05-13

    申请号：CZ273496

    申请日：1996-09-18

    Applicant: BASF AG

    Inventor： BAUR KARL GERHARD DR ,  ANNEN ULRICH DR ,  EXNER HERBERT DR ,  FRIED MICHAEL DR ,  RAUH ULRICH

    IPC: C07C67/08 ,  C07C67/327 ,  C07C69/54

    Abstract: A process for the prodn. of (1-4C alkyl) (meth)acrylate esters (AM/AE) from esters of formula (I) and opt. esters of formula (II), in which R = H or Me; R , R = 1-4C alkyl; n = 0 or more. The process comprises reaction in the liq. phase under reduced pressure in presence of acid, with continuous removal of cleavage prods. Also claimed is a process for the prodn. of (AM/AE) by the acid-catalysed esterification of 1-4C alkanols with (meth)acrylic acid, in which by-prods. (I) and (II) are sepd. from the prod. mixt. and subjected to the above cleavage process, and the cleavage prods. are continuously removed and returned to the esterification process.

    5.
    发明专利
    未知

    公开(公告)号：ES2105049T3

    公开(公告)日：1997-10-16

    申请号：ES93118478

    申请日：1993-11-16

    Applicant: BASF AG

    Inventor： BAUR KARL GERHARD DR ,  PAPKALLA THOMAS DR ,  KANNE ULRICH DR ,  STOPS PETER

    IPC: C02F1/58 ,  C02F1/72 ,  C02F11/08 ,  C02F101/16 ,  C02F101/30

    Abstract: Oxidation of ammonium ions and organic carbon in ammonium-ion-containing and organic carbon-containing waste waters (effluents) by nitric acid at 100 to 350@C, in that the molar ratio of organic carbon to ammonium nitrogen is established at a range of 0.3:1 to 4:1 by addition of organic carbon or ammonium nitrogen. In a preferred embodiment which is reproduced by way of example in the figure, the waste water, which can be enriched, depending on the TOC content, with organic carbon, is transported via the feedline (1), possibly from an intermediate tank (2), by a pump (3) through a heat exchanger (4) in which it is preheated to, for example, 270@C. The preheated waste water is then heated by direct feed of 100 bar high-pressure steam via feedline (5) or by indirect heating to 290@C. After establishing the nitric acid concentration necessary for the ammonium degradation, e.g. via a feedline (6) in the waste water at 290@C, this is conveyed through a reactor (7) without back-mixing (e.g. a tubular reactor having internals and which is clad with titanium). After a residence time of, for example, 5 to 10 min, the reaction solution is cooled in counter-current with the feed and is depressurised in a separator (8). The waste water is removed via a line (9), via an intermediate tank (10) and a heat exchanger (11).

    6.
    发明专利
    未知

    公开(公告)号：DE19536183A1

    公开(公告)日：1997-04-03

    申请号：DE19536183

    申请日：1995-09-28

    Applicant: BASF AG

    Inventor： BAUR KARL GERHARD DR ,  ANNEN ULRICH DR ,  EXNER HERBERT DR ,  FRIED MICHAEL DR ,  RAUCH ULRICH

    IPC: C07C67/08 ,  C07C67/327 ,  C07C69/54 ,  C07C67/48 ,  C07C69/67 ,  C07C67/313

    Abstract: A process for the prodn. of (1-4C alkyl) (meth)acrylate esters (AM/AE) from esters of formula (I) and opt. esters of formula (II), in which R = H or Me; R , R = 1-4C alkyl; n = 0 or more. The process comprises reaction in the liq. phase under reduced pressure in presence of acid, with continuous removal of cleavage prods. Also claimed is a process for the prodn. of (AM/AE) by the acid-catalysed esterification of 1-4C alkanols with (meth)acrylic acid, in which by-prods. (I) and (II) are sepd. from the prod. mixt. and subjected to the above cleavage process, and the cleavage prods. are continuously removed and returned to the esterification process.

    8.
    发明专利
    未知

    公开(公告)号：DE4239487A1

    公开(公告)日：1994-05-26

    申请号：DE4239487

    申请日：1992-11-25

    Applicant: BASF AG

    Inventor： BAUR KARL GERHARD DR ,  PAPKALLA THOMAS DR ,  KANNE ULRICH DR ,  STOPS PETER

    IPC: C02F1/58 ,  C02F1/72 ,  C02F11/08 ,  C02F101/16 ,  C02F101/30 ,  C02F1/02

    Abstract: Oxidation of ammonium ions and organic carbon in ammonium-ion-containing and organic carbon-containing waste waters (effluents) by nitric acid at 100 to 350@C, in that the molar ratio of organic carbon to ammonium nitrogen is established at a range of 0.3:1 to 4:1 by addition of organic carbon or ammonium nitrogen. In a preferred embodiment which is reproduced by way of example in the figure, the waste water, which can be enriched, depending on the TOC content, with organic carbon, is transported via the feedline (1), possibly from an intermediate tank (2), by a pump (3) through a heat exchanger (4) in which it is preheated to, for example, 270@C. The preheated waste water is then heated by direct feed of 100 bar high-pressure steam via feedline (5) or by indirect heating to 290@C. After establishing the nitric acid concentration necessary for the ammonium degradation, e.g. via a feedline (6) in the waste water at 290@C, this is conveyed through a reactor (7) without back-mixing (e.g. a tubular reactor having internals and which is clad with titanium). After a residence time of, for example, 5 to 10 min, the reaction solution is cooled in counter-current with the feed and is depressurised in a separator (8). The waste water is removed via a line (9), via an intermediate tank (10) and a heat exchanger (11).

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