Mild desulfurization of sulfur-bearing materials
AssigneeIowa State University Research Foundation, Inc.
InventorsJohn G. Verkade, Thyagarajan Mohan
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Abstract
A method for the removal of sulfur from sulfur-bearing materials such as coal and petroleum products using organophosphine and organophosphite compounds is provided.
Claims20
A method for the removal of sulfur from a sulfur-bearing material comprising contacting a sample of the sulfur-bearing material with a protonic acid and an organophosphorus compound of the formula PR.sub.3 or P(OR).sub.3, wherein each R is independently an aliphatic or aromatic group, for a time sufficient to remove at least a portion of the sulfur.
A method for the removal of sulfur from a sulfur-bearing material comprising:
- (a) contacting a sample of the sulfur-bearing material with a protonic acid and an organophosphorus compound of the formula PR.sub.3 or P(OR).sub.3, wherein each R is independently an aliphatic or aromatic group, for a time sufficient to remove at least a portion of the sulfur from the sulfur-bearing material and form an organophosphorus sulfide compound;
- and
- (b) heating the organophosphorus sulfide compound in the presence of hydrogen at a temperature and for a time sufficient to regenerate the organophosphorus compound.
A method for the removal of sulfur from a sulfur-bearing material comprising:
- (a) contacting a sample of the sulfur-bearing material with a protonic acid and an organophosphorus compound of the formula PR.sub.3 or P(OR).sub.3, wherein each R is independently an aliphatic or aromatic group, for a time sufficient to remove at least a portion of the sulfur and form an organophosphorus sulfide compound;
- (b) heating the organophosphorus sulfide compound in the presence of a lower metal sulfide compound to form a higher metal sulfide compound and regenerate the organophosphorus compound;
- and
- (c) heating the higher metal sulfide compound in the presence of hydrogen at a temperature and for a time sufficient to form hydrogen sulfide and regenerate the lower metal sulfide compound.
Dependencies are inferred from the claim text.