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    • 1. 发明授权
    • Process for preparing chromium(III) oxide
    • 制备氧化铬(III)的方法
    • US09580333B2
    • 2017-02-28
    • US13991516
    • 2011-12-07
    • Holger FriedrichMatthias BollRainer Ortmann
    • Holger FriedrichMatthias BollRainer Ortmann
    • C01G37/033C01G37/00C09C1/34
    • C01G37/033C01G37/00C01P2006/80C09C1/346
    • Process for preparing chromium(III) oxide, which comprises the steps: a) reaction of sodium monochromate with gaseous ammonia, in particular at a temperature of from 200 to 800° C., b) hydrolysis of the reaction product obtained in step a) with the pH of the water for the hydrolysis being reduced before the hydrolysis or that of the alkaline mother liquor being reduced during or after the hydrolysis, to a value of from 4 to 11, preferably from 5 to 10, by means of an acid, c) isolation of the hydrolysis product which has precipitated in step b), preferably at a pH of from 4 to 11, in particular from 5 to 10, and optionally washing and optionally drying and d) calcination of the hydrolysis product obtained in step c) at a temperature of from 700 to 1400° C., in particular from 800 to 1300° C.
    • 制备氧化铬(III)的方法,其包括以下步骤:a)将单色钠与气态氨反应,特别是在200至800℃的温度下,b)水解步骤a)中获得的反应产物, 在水解之前水解的水的pH降低,或在水解期间或之后碱性母液的pH降低至4至11,优选5至10的值,借助于酸, c)分离在步骤b)中沉淀的水解产物,优选在4至11,特别是5至10的pH下,并任选地洗涤和任选地干燥和d)煅烧步骤c中获得的水解产物 ),温度为700〜1400℃,特别是800〜1300℃。