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    VERFAHREN ZUR HERSTELLUNG VON CHROM(III)OXID
    1.
    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.

    VERFAHREN ZUR HERSTELLUNG VON AMMONIUMDICHROMAT
    6.
    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 CHROM(III)-OXID
    8.
    发明公开
    VERFAHREN ZUR HERSTELLUNG VON CHROM(III)-OXID 审中-公开
    VERFAHREN ZUR HERSTELLUNG VON CHROM（III）-OXID

    公开(公告)号：EP2649010A1

    公开(公告)日：2013-10-16

    申请号：EP11791295.6

    申请日：2011-12-07

    申请人： LANXESS Deutschland GmbH

    发明人： FRIEDRICH, Holger ,  BOLL, Matthias ,  ORTMANN, Rainer

    IPC分类号： C01G37/00 ,  C01G37/033 ,  C09C1/34

    CPC分类号： C01G37/033 ,  C01G37/00 ,  C01P2006/80 ,  C09C1/346

    摘要： Process for preparing chromium(III) oxide, which comprises the steps: a) reaction of sodium monochromate with gaseous ammonia, more particularly at a temperature of from 200 to 800°C, b) hydrolysis of the reaction product obtained according to step a), where the pH of the water for the hydrolysis is reduced by means of an acid before the hydrolysis or that of the alkaline mother liquor is reduced by means of an acid during or after the hydrolysis to a value of from 4 to 11, preferably from 5 to 10, c) isolation of the hydrolysis product precipitated according to step b), preferably at a pH of from 4 to 11, more particularly from 5 to 10, and optionally washing and optionally drying, and d) calcination of the hydrolysis product obtained according to step c) at a temperature of from 700 to 1400°C, more particularly from 800 to 1300°C.

    摘要翻译： 制备氧化铬（III）的方法，其包括以下步骤：a）单铬酸钠与气态氨反应，更特别是在200-800℃的温度下，b）将根据步骤a）获得的反应产物水解， 其中在水解之前通过酸将水解的pH值降低或者在水解期间或之后通过酸将碱性母液的值降低至4至11的值，优选从 5至10，c）分离根据步骤b）沉淀的水解产物，优选在4至11，更特别是5至10的pH下沉淀，并且任选洗涤并任选干燥，和d）水解产物的煅烧 根据步骤c）在700-1400℃，更特别是800-1300℃的温度下获得。

    VERFAHREN ZUR REDUKTION VON SECHSWERTIGEM CHROM IN OXIDISCHEN FESTSTOFFEN
    10.
    发明公开
    VERFAHREN ZUR REDUKTION VON SECHSWERTIGEM CHROM IN OXIDISCHEN FESTSTOFFEN 有权
    VERFAHREN ZUR减少VON SECHSWITIGEM CHROM氧化物FESTSTOFFEN

    公开(公告)号：EP3218308A1

    公开(公告)日：2017-09-20

    申请号：EP15784937.3

    申请日：2015-10-14

    申请人： Lanxess Deutschland GmbH

    发明人： ORTMANN, Rainer ,  FRIEDRICH, Holger ,  BOLL, Matthias

    IPC分类号： C01G37/00

    CPC分类号： C01G37/00

    摘要： The invention relates to a method for reducing hexavalent chromium in oxidic solids, having the following steps: a) heating the oxidic solid, which contains Cr(VI), to a temperature of 600 to 1400 °C in an atmosphere containing less than 0.1 vol.% of an oxidizing gas and b) cooling the reaction product obtained according to step a) to a temperature below 100 °C in an atmosphere containing less than 0.1 vol.% of an oxidizing gas. The invention is characterized in that no reducing agents are added to the oxidic solid or to the atmosphere in steps a) and b) in the method.

    摘要翻译： 本发明涉及一种用于减少氧化固体中六价铬的方法，其具有以下步骤：a）在含有少于0.1体积％的气氛中将含有Cr（VI）的氧化固体加热至600至1400℃的温度 的氧化气体和b）在含有小于0.1体积％的氧化气体的气氛中将根据步骤a）获得的反应产物冷却至低于100℃的温度。 本发明的特征在于，在方法的步骤a）和b）中没有将还原剂加入到氧化固体或大气中。