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    2.
    发明专利
    未知

    公开(公告)号：BR0111229A

    公开(公告)日：2003-03-18

    申请号：BR0111229

    申请日：2001-05-21

    Applicant: BASF AG

    Inventor： ALLEN PETER MARK ,  GAHN CHRISTOPH ,  RIEKER CHRISTOPHER WILLIAM ,  SCHNEIDER HEINZ-WALTER ,  WAGNER ROBERT

    IPC: B01D9/02 ,  B01D9/00

    Abstract: An apparatus and a process for crystallizing substances from solutions or dispersions containing these substances, in a crystallizer containing a classifying zone ( 3 ), comprise a) an inner and an outer circulation system ( 1; 2 ), the inner circulation system ( 1 ) being present in the crystallizer, the inlet of the outer circulation system ( 2 ) being connected to the inner circulation system ( 1 ) via the classifying zone ( 3 ), the outer circulation system, being present outside the crystallizer, the outlet of the outer circulation system ( 2 ) being connected to the inner circulation system ( 1 ) of the crystallizer, and a means for dissolving crystals being arranged in the outer circulation system ( 2 ), before its outlet, b) an inflow ( 4 ) for solution and/or dispersion, which inflow is present on the crystallizer or on the outer circulation system, and c) an outflow ( 5 ) for dispersions, which outflow is arranged on the crystallizer or on the outer circulation system. The novel apparatus has the special feature that a line ( 8 ) connecting the outer and inner circulation systems ( 1; 2 ) to one another and intended for transporting (recycling) dispersion and/or a line ( 8 ) for transporting (recycling) dispersion are additionally present, in which both its entrance and its exit are connected to the inner circulation system ( 1 ).

    PREPARATION OF A HYDROGENATION CATALYST
    3.
    发明专利
    PREPARATION OF A HYDROGENATION CATALYST 未知

    公开(公告)号：CA2231536A1

    公开(公告)日：1997-04-10

    申请号：CA2231536

    申请日：1996-09-26

    Applicant: BASF AG

    Inventor： HEINEKE DANIEL ,  SCHNEIDER HEINZ-WALTER ,  RIEKER CHRISTOPHER WILLIAM ,  OOSTVOGELS JOZEF ,  POSTELMANS DANY ,  THOME ALFRED ,  ACHHAMMER GUENTHER

    IPC: B01J23/42 ,  B01J23/96 ,  B01J37/16 ,  B01J38/48 ,  C01B21/14

    Abstract: The invention relates to a hydrogenation catalyst by the reduction from platinum in the stage of oxidation of +4 (Pt (IV)) with a selective reducing agent in an acidic aqueous medium in the presence of a carbon-containing carrier to platinum in the stage of oxidation +2 (Pt (II)), subsequent poisoning of the platinum thus obtained with a sulphur-containing selective reducing agent, and subsequent reduction of the platinum thus partially poisoned to form metallic platinum (Pt(0)) and subsequent processing as known per se in that (a) Pt (II) is partially poisoned with a sulphur-containing selective reducing agent, wherein the sulphur-containing selective reduction agent is used in an amount which corresponds to from 15 to 70 mol % of the amount of the sulphur-containing selective reducing agent which might be needed to reduce Pt(IV) to Pt (II), provided that the amount of Pt (IV) corresponds to the amount of Pt (II) used and to be poisoned, and subsequently the partially poisoned Pt (II) is reduced with an alkali metal formate to Pt (0); or (b) platinum in the stage of oxidation of greater than +2 is partially poisoned and subsequently or simultaneously reduced with an alkali metal formate to Pt (0). The invention also relates to a hydrogenation catalyst, use of the hydrogenation catalyst for preparing hydroxylammonium salts, a process for the preparation of hydroxylammonium salts, and a process for regenerating platinum-containing hydrogenation catalysts.

    4.
    发明专利
    未知

    公开(公告)号：AT293485T

    公开(公告)日：2005-05-15

    申请号：AT01943419

    申请日：2001-05-21

    Applicant: BASF AG

    Inventor： ALLEN PETER MARK ,  GAHN CHRISTOPH ,  RIEKER CHRISTOPHER WILLIAM ,  SCHNEIDER HEINZ-WALTER ,  WAGNER ROBERT

    IPC: B01D9/02 ,  B01D9/00

    Abstract: An apparatus and a process for crystallizing substances from solutions or dispersions containing these substances, in a crystallizer containing a classifying zone ( 3 ), comprise a) an inner and an outer circulation system ( 1; 2 ), the inner circulation system ( 1 ) being present in the crystallizer, the inlet of the outer circulation system ( 2 ) being connected to the inner circulation system ( 1 ) via the classifying zone ( 3 ), the outer circulation system, being present outside the crystallizer, the outlet of the outer circulation system ( 2 ) being connected to the inner circulation system ( 1 ) of the crystallizer, and a means for dissolving crystals being arranged in the outer circulation system ( 2 ), before its outlet, b) an inflow ( 4 ) for solution and/or dispersion, which inflow is present on the crystallizer or on the outer circulation system, and c) an outflow ( 5 ) for dispersions, which outflow is arranged on the crystallizer or on the outer circulation system. The novel apparatus has the special feature that a line ( 8 ) connecting the outer and inner circulation systems ( 1; 2 ) to one another and intended for transporting (recycling) dispersion and/or a line ( 8 ) for transporting (recycling) dispersion are additionally present, in which both its entrance and its exit are connected to the inner circulation system ( 1 ).

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