C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/116
C01B 17/88 (2006.01) C01B 17/90 (2006.01)
Patent
CA 1336126
A process for the concentration by evaporation of 60 to 75 % sulfuric acid containing metal sulfates, comprising concentrating 60 to 75 % sulfuric acid containing metal sulfates to a concentration of 85 to 96 % H2SO4 by evaporation in vacuo at a temperature of 150 to 220°C, the sulfuric acid to be concentrated by evaporation containing less than 0,01 % by weight and preferably less than 0,005 % by weight iron(III) ions.
568421
Brandle Karl
Gerken Rudolf
Lailach Gunter
Aktiengesellschaft Bayer
Fetherstonhaugh & Co.
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