Recovery of alkali metal catalyst constituents with sulfurous ac

Details Recovery of alkali metal catalyst constituents with sulfurous ac Recovery of alkali metal catalyst constituents with sulfurous ac

1980-11-24

1982-06-15

Kratz, Peter F.

Gas: heating and illuminating

Processes

Coal and water

48210, 252373, 252413, 252420, 423127, C10J 306, C10J 354

Patent

active

043348939

ABSTRACT:
In a coal gasification operation or similar conversion process carried out in the presence of an alkali metal-containing catalyst wherein solid particles containing alkali metal residues are produced, alkali metal constituents are recovered from the particles primarily in the form of water-soluble alkali metal sulphites and bisulphites by treating the particles with a solution of sulfurous acid. During the treating process the water-insoluble alkali metal compounds in the alkali metal residues are converted into water-soluble alkali metal sulphites and bisulphites, which have been found to be catalytically active. The aqueous solution containing water-soluble alkali metal sulphites and bisulphites is then separated from the treated particles and any insoluble material formed during the treatment process, treated to remove soluble aluminum compounds and recycled to the gasification process where the alkali metal sulphites and bisulphites serve as at least a portion of the alkali metal constituents which comprise the alkali metal-containing catalyst.

REFERENCES:
patent: 1148092 (1915-07-01), Kalmus et al.
patent: 4057512 (1977-11-01), Vodovic et al.
patent: 4193771 (1980-03-01), Sharp et al.
Peters et al., "Methods for Producing Alumina from Clay", Report of Investigators 5997, Bureau of Mines 1962.

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