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    VERFAHREN ZUR HERSTELLUNG VON AMMONIUMDICHROMAT
    1.
    发明公开
    VERFAHREN ZUR HERSTELLUNG VON AMMONIUMDICHROMAT 审中-公开
    用于生产重铬酸铵

    公开(公告)号：EP2516331A1

    公开(公告)日：2012-10-31

    申请号：EP10787480.2

    申请日：2010-12-08

    申请人： Lanxess Deutschland GmbH

    发明人： FRIEDRICH, Holger ,  ORTMANN, Rainer ,  STENGER, Matthias ,  BOLL, Matthias ,  VAN ROOYEN, Daniel ,  KALIDEEN, Naveen

    IPC分类号： C01G37/00 ,  C01G37/02 ,  C01G37/14

    CPC分类号： C01G37/14

    摘要： The invention relates to a method for producing ammonium dichromate, comprising the following steps: c) thermal decomposition of an alkali metal-ammonium chromate double salt, especially a sodium-ammonium chromate double salt or the hydrates thereof, at a temperature of up to 200°C, especially between 75 and 190°C, forming ammonium dichromate, and d) separation of the ammonium dichromate from the decomposition product obtained in step c), by crystallisation. Said method is characterised in that the alkali metal-ammonium chromate double salt corresponds to formula Mx (NH
    4 )
    y CrO
    4 or the hydrates thereof, wherein M is Na or K, especially preferably Na, x is a number between 0.1 and 0.9, preferably between 0.4 and 0.7, y is a number between 1.1 and 1.9, preferably between 1.3 and 1.6, and the sum of x and y is 2.

    VERFAHREN ZUR HERSTELLUNG VON ALKALIMETALL-AMMONIUMCHROMAT-DOPPELSALZEN
    2.
    发明公开
    VERFAHREN ZUR HERSTELLUNG VON ALKALIMETALL-AMMONIUMCHROMAT-DOPPELSALZEN 审中-公开
    用于生产碱金属铵铬酸盐复盐

    公开(公告)号：EP2655258A1

    公开(公告)日：2013-10-30

    申请号：EP11802947.9

    申请日：2011-12-21

    申请人： LANXESS Deutschland GmbH

    发明人： ORTMANN, Rainer ,  STENGER, Matthias ,  FRIEDRICH, Holger ,  VAN ROOYEN, Daniel ,  KALIDEEN, Naveen ,  BOLL, Matthias

    IPC分类号： C01G37/00 ,  C01G37/14 ,  C01G37/033 ,  C01G37/02

    CPC分类号： C01G37/006 ,  C01G37/02 ,  C01G37/14 ,  C01P2006/80

    摘要： The invention relates to a method for producing alkali metal ammonium chromate double salts of the formula M
    x (NH
    4 )
    y Cr0
    4 or hydrates thereof, where M stands for Na or K, wherein Na is especially preferred, x stands for a number from 0.1 to 0.9, preferably from 0.4 to 0.7, y stands for a number from 1.1 to 1.9, preferably from 1.3 to 1.6, and the sum of x and y is 2, comprising the following steps: a) reacting alkali metal dichromate and ammonia in an aqueous medium and precipitating the obtained alkali metal ammonium chromate double salt, b) separating the alkali metal ammonium chromate double salt obtained in step a) from the mother liquor, c) reacting the mother liquor containing alkali metal monochromate obtained from step b) with carbon dioxide, possibly after said mother liquor has been concentrated, and precipitating the alkali metal hydrogen carbonate arising from the reaction, d) separating the alkali metal hydrogen carbonate obtained in step c), and e) returning the mother liquor containing alkali metal dichromate obtained from step d) to step a).

    VERFAHREN ZUR HERSTELLUNG VON CHROM(III)OXID
    3.
    发明公开
    VERFAHREN ZUR HERSTELLUNG VON CHROM(III)OXID 有权
    用于生产铬（III），氧化

    公开(公告)号：EP2516332A1

    公开(公告)日：2012-10-31

    申请号：EP10790552.3

    申请日：2010-12-08

    申请人： Lanxess Deutschland GmbH

    发明人： FRIEDRICH, Holger ,  ORTMANN, Rainer ,  STENGER, Matthias ,  VAN ROOYEN, Daniel ,  KALIDEEN, Naveen ,  BOLL, Matthias

    IPC分类号： C01G37/00 ,  C01G37/02 ,  C01G37/14

    CPC分类号： C01G37/033 ,  B22F9/20 ,  C01G37/14 ,  C09C1/34 ,  C09K3/1409 ,  C22C1/045

    摘要： Producing chromium(III) oxide, comprises: (a) decomposing an alkali-metal-ammonium chromate double salt at 200-650[deg] C, preferably 250-55O[deg] C; (b) washing the decomposition product obtained in the step (a); and (c) calcining the product obtained in the step (b) at 700-1400[deg] C, preferably 800-1300[deg] C. The alkali metal ammonium chromate double salt comprises sodium-ammonium chromate double salt, which exhibits a molar ratio of ammonia to sodium of greater than 2. An independent claim is also included for producing the alkali-metal-ammonium chromate double salt of formula (M x(NH 4) yCrO 4) (I) or its hydrate, comprising adding ammonia at 55-95[deg] C to an aqueous solution of alkali dichromate of formula (M 2Cr 2O 7) (II). x : 0.1-0.9, preferably 0.4-0.7; and y : 1.1-1.9, preferably 1.3-1.6; or x+y : 2; and M : Na or K.