Catalyst – solid sorbent – or support therefor: product or process – Regenerating or rehabilitating catalyst or sorbent – Gas or vapor treating
Patent
1997-07-30
2000-07-04
Griffin, Steven P.
Catalyst, solid sorbent, or support therefor: product or process
Regenerating or rehabilitating catalyst or sorbent
Gas or vapor treating
502 38, 502 49, 502 51, 502 52, 423638, B01J 2034, C01B 1314
Patent
active
060838620
ABSTRACT:
Calcium sulfide particles in mixtures with carbon particles, as in coal gasifier waste, are converted to calcium oxide by repeated cycles of oxidation and reduction by utilizing the carbon as a source of the reducing gas required for the treatment. The treatment can be conducted in a two zone fluidized bed reactor by limiting the amount and concentration of oxygen supplied to a lower reducing zone and by supplying excess oxygen to an upper oxidizing zone. Alternatively, for particles less than 0.5 mm in size, the treatment can be conducted by utilizing either two transport reactors or two circulating fluidized bed reactors in series whereby the first reactor in the series is maintained in a reducing state and the second reactor is maintained in an oxidizing state. The particles are transported sequentially through both reactors and recycled several times. The amount and concentration of oxygen supplied to the first reactor is limited to create reducing conditions, while excess oxygen is supplied to the second reactor to create oxidizing conditions.
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Donley Cynthia M.
Griffin Steven P.
Iowa State University & Research Foundation, Inc.
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