Working up spent sulphuric acid simultaneously with sulphate sal

Details Working up spent sulphuric acid simultaneously with sulphate sal Working up spent sulphuric acid simultaneously with sulphate sal

1977-09-26

1979-05-08

Vertiz, O. R.

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

423522, 423540, 423DIG2, C01B 1790, C01B 1772, C01B 1750

Patent

active

041536282

ABSTRACT:
Spent sulphuric acid, either alongside or mixed with contaminated metal salts such as iron sulphate heptahydrate, is regenerated to fresh acid by countercurrent contact with gases from cleavage of the sulphate salts, such gases containing SO.sub.3 which effects build up of the acid concentration. The built up acid is evaporated in another stage to obtain pure acid. The metal sulphate solids are subjected to high temperature cleavage, generating SO.sub.3 which effects the previous concentration. Cleavage also produces some SO.sub.2 which is converted to SO.sub.3 by wet catalysis.

REFERENCES:
patent: 1048247 (1912-12-01), Weeks
patent: 1489347 (1924-04-01), Davison
patent: 2098056 (1937-11-01), McBerty
patent: 2255445 (1941-09-01), Clarkson
patent: 3713786 (1973-01-01), Umstead
patent: 3825657 (1974-07-01), Jennines
patent: 3906039 (1975-09-01), Furkert
patent: 3944657 (1976-03-01), Furkert
patent: 4029751 (1977-06-01), Dorr et al.

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