Process for producing CO.sub.2, and CO.sub.2 so produced

Details Process for producing CO.sub.2, and CO.sub.2 so produced Process for producing CO.sub.2, and CO.sub.2 so produced

1982-03-22

1984-02-14

Straub, Gary P.

Chemistry of inorganic compounds

Carbon or compound thereof

Oxygen containing

423168, 423542, 48DIG1, 252373, C01B 3120, C01V 302

Patent

active

044316224

ABSTRACT:
Fuel is passed (via line 13) to a fluidized fuel conversion bed (21) containing reactive CaO and CaSO.sub.4 at a fuel-oxidation temperature (e.g. 730.degree. C.) below the temperature at which CaO reacts with CO.sub.2 to form CaCO.sub.3. The bed is fluidized by an inerts-free gas containing hydrogen (and/or a source thereof, e.g. steam) and fuel is therein partially oxidized, CaSO.sub.4 being reduced to CaS. CO.sub.2 thus formed is fixed as CaCO.sub.3, and bed solids containing CaS and CaCO.sub.3 pass (via 33) to a fluidized decarbonation bed (34) operated at a temperature (e.g. 850.degree. C.) above the decarbonation temperature of CaCO.sub.3 whereby CO.sub.2 is liberated and is recovered after passage through a heat recovery device (6). The decarbonation bed (34) is preferably fluidized by the gas products from the fuel conversion which reduce CaSO.sub.4 therein to CaS and form additional CO.sub.2. Bed solids containing CaS and CaO pass (line 37) to an oxidation bed (36) fluidized with air to convert CaS to CaSO.sub.4 with much heat liberation. Hot bed solids are returned to the decarbonation and fuel conversion beds to furnish heat and CaSO.sub.4 to maintain the reactions therein.

REFERENCES:
patent: 1772652 (1930-08-01), White
patent: 2602019 (1952-07-01), Odell
patent: 2970893 (1961-02-01), Viles
patent: 3397962 (1968-08-01), Squires
patent: 3402998 (1968-09-01), Squires
patent: 3535082 (1970-10-01), Nurnberg et al.
patent: 3707462 (1972-12-01), Moss
patent: 4309198 (1982-01-01), Moss

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