发明公开
- 专利标题： VERFAHREN ZUR HERSTELLUNG VON ALKALIMETALL-AMMONIUMCHROMAT-DOPPELSALZEN
- 专利标题（英）： Method for producing alkali metal ammonium chromate double salts
- 专利标题（中）： 用于生产碱金属铵铬酸盐复盐
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申请号： EP11802947.9申请日： 2011-12-21
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公开(公告)号： EP2655258A1公开(公告)日： 2013-10-30
- 发明人: ORTMANN, Rainer , STENGER, Matthias , FRIEDRICH, Holger , VAN ROOYEN, Daniel , KALIDEEN, Naveen , BOLL, Matthias
- 申请人： LANXESS Deutschland GmbH
- 申请人地址： Kennedyplatz 1 50569 Köln DE
- 专利权人： LANXESS Deutschland GmbH
- 当前专利权人： LANXESS Deutschland GmbH
- 当前专利权人地址： Kennedyplatz 1 50569 Köln DE
- 优先权： EP10196120 20101221
- 国际公布： WO2012085129 20120628
- 主分类号： C01G37/00
- IPC分类号： C01G37/00 ; C01G37/14 ; C01G37/033 ; C01G37/02
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).
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).
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