Chemistry of inorganic compounds – Sulfur or compound thereof – Oxygen containing
Patent
1975-08-11
1977-08-02
Vertiz, O. R.
Chemistry of inorganic compounds
Sulfur or compound thereof
Oxygen containing
210 45, 210DIG1, 423DIG2, 423356, 423544, 423566, C01B 1750, C01B 1796, C01C 102, B01D 500
Patent
active
040396495
ABSTRACT:
Process for recovering sulfur from waste waters containing sulfuric acid, comprising reacting in a first step, the waste water with an aqueous solution of ammonium sulfite, separating the formed sulfur dioxide from the solution, reacting the resulting solution in a second step with calcium oxide to form calcium sulfate and an aqueous ammonia solution, vaporizing ammonia therefrom, reducing the calcium sulfate by means of carbon to form calcium oxide and sulfur dioxide, contacting said vaporized ammonia with said sulfur dioxide and with water, thereby forming an aqueous solution of ammonium sulfite, which is joined to that used in the first step and recycling at least a part of the calcium oxide obtained by reduction of the calcium sulfate to the second step.
REFERENCES:
patent: 1108705 (1914-08-01), Cobb
patent: 1274247 (1918-07-01), Danneel et al.
patent: 2856267 (1958-10-01), Kamlet
patent: 2862789 (1958-12-01), Burgress
patent: 3561925 (1971-02-01), Deschamps et al.
patent: 3729551 (1973-04-01), Gorin
patent: 3862335 (1975-01-01), Renault et al.
Alagy Jacques
Busson Christian
Cessou Maurice
Institut Francais du Pe'trole
Straub Gary P.
Vertiz O. R.
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