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US 4,308,247 AGranted
Recovering nitrogen bases from a hydrosulfide/sulfur dioxide removal process
AssigneePhillips Petroleum Company
InventorsRobert L. Horton, Melvin A. Albright
Life of this patent
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Abstract
A nitrogen base is separated from the sulfur-containing product of a gas phase reaction between a basic nitrogen compound and at least one of a hydrosulfide and sulfur dioxide by washing the product of the reaction, followed by basification and stripping of the wash liquid. In another embodiment, the nitrogen base is displaced from the sulfur-containing product with anhydrous ammonia.
Claims22
A process comprising:
- (a) contacting a gaseous basic nitrogen compound with a first gas stream comprising gaseous hydrosulfide and sulfur dioxide to form a second gas stream and a solid sulfur-containing composition containing elemental sulfur;
- (b) contacting at least a portion of the solid, sulfur-containing composition with an aqueous wash liquid to produce an aqueous solution containing a water-soluble portion of the sulfur-containing composition;
- (c) separating at least a portion of the aqueous solution from a water insoluble portion of said sulfur-containing composition which contains elemental sulfur;
- (d) basifying at least a portion of the aqueous solution to form a mixture comprising the basic nitrogen compound and a basic wash liquid;
- and
- (e) separating at least a portion of the basic nitrogen compound from at least a portion of the basic wash liquid.
3 more elements
A method comprising:
- (a) contacting a gaseous amine with a first gas stream comprising at least one of a gaseous hydrosulfide and sulfur dioxide to form a second gas stream and a solid sulfur-containing composition;
- (b) contacting at least a portion of the solid, sulfur-containing composition with anhydrous ammonia to displace at least a portion of the amine from the solid, sulfur-containing composition;
- (c) separating at least a portion of the amine from the anhydrous ammonia and sulfur-containing composition.
Dependencies are inferred from the claim text.