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US 4,071,328 AGranted
Method of removing sulfur from coal
AssigneeThe Dow Chemical Company
InventorGerard C. Sinke
Life of this patent
Estimating the term…
Abstract
A process of reducing the total sulfur content of coal is disclosed. The process comprises hydrogenating the coal to remove at least a portion of the recoverable sulfur combined as pyritic sulfur. The hydrogenated coal is subsequently contacted with a sufficient amount of an aqueous inorganic acid solution to remove at least a portion of the remaining sulfur initially combined as pyritic sulfur.
Claims16
A process of reducing the total sulfur content of coal comprising:
- hydrogenating the coal to convert at least a portion of the recoverable sulfur combined as pyritic sulfur to iron (II) sulfide;
- contacting the hydrogenated coal with a sufficient amount of an aqueous hydrochloric acid solution to remove at least a portion of the sulfur combined as iron (II) sulfide.
A process of reducing the total sulfur content of coal comprising:
- a. hydrogenating the coal under a pressure of from about 200 to about 550 pounds per square inch gauge at a temperature of from about 300.degree. C to about 350.degree. C for a sufficient time to convert at least a portion of the recoverable sulfur combined as pyritic sulfur to iron (II) sulfide;
- b. contacting the hydrogenated coal at a temperature of from about 40.degree. C to about 80.degree. C with a sufficient amount of an aqueous hydrochloric acid solution to react with and thereby remove at least a portion of the sulfur combined as iron (II) sulfide.
Dependencies are inferred from the claim text.