Method for regenerating and recycling catalyst for oxidation of

Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Sulfur or sulfur containing component

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252416, 423166, 423555, 423522, C01B 1700, C01F 1146

Patent

active

041016351

ABSTRACT:
In a method for oxidizing sulfur dioxide by contacting a sulfur dioxide-containing gas and an oxygen-containing gas with an aqueous solution containing pentavalent vanadium and divalent manganese as a catalyst, the method for regenerating and recycling the oxidation catalyst which comprises adding at least one calcium compound selected from the group consisting of calcium oxide, calcium hydroxide and calcium carbonate and an oxygen-containing gas as an oxidizing agent to at least a part of the aqueous solution catalyst used in the oxidation reaction, separating the resulting gypsum, and recycling the recovered aqueous solution catalyst for use in the oxidation of sulfur dioxide.

REFERENCES:
patent: 2021936 (1935-11-01), Johnstone
patent: 2090142 (1937-08-01), Nonheb et al.
patent: 2113198 (1938-04-01), Nonheb et al.
patent: 3836630 (1974-09-01), Noguchi et al.
patent: 3914387 (1975-10-01), Von Jordan et al.
patent: 3947560 (1976-03-01), Nambu et al.

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