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US 4,781,731 AGranted
Integrated method of charge fuel pretreatment and tail gas sulfur removal in a partial oxidation process
AssigneeTexaco Inc.
InventorWarren G. Schlinger
Life of this patent
Estimating the term…
Abstract
In the partial oxidation of a sulfur- and metal-containing carbonaceous charge fuel to produce a sulfur-containing synthesis gas and metal-containing molten slag, an integrated method of charge fuel pretreatment and Claus unit tail gas sulfur removal is provided. The process of the instant invention is advantageous over other partial oxidation processes in that: (i) a fluid, molten slag which flows easily is produced, thereby improving reactor performance; and (ii) the overall removal of sulfur compounds from the synthesis gas is made simpler, more efficient, and less costly, as the need for a conventional Claus unit tail gas sulfur removal process is eliminated.
Claims15
A method for producing a synthesis gas comprising:
- (a) partially oxidizing a sulfur- and metal-containing carbonaceous charge fuel in the presence of a temperature moderator and an oxygen-containing gas to produce a sulfur-containing hot synthesis gas and a metal-containing molten slag;
- (b) partially cooling the sulfur-containing synthesis gas via direct or indirect means or a combination thereof;
- (c) scrubbing the partially cooled sulfur-containing synthesis gas with aqueous scrubbing liquor to remove particulates and further cool the synthesis gas;
- (d) further scrubbing the partially cooled sulfur-containing synthesis gas with a scrubbing liquor to produce:
- (i) a fuel gas stream with a substantially reduced sulfur content;
- and
- (ii) an off-gas stream comprising sulfur-containing compounds;
- (e) directing the off-gas stream comprising sulfur-containing compounds to a Claus process unit to produce elemental sulfur and a tail gas stream comprising residual amounts of sulfur-containing compounds;
- (f) contacting the tail gas stream with particles comprising iron-containing compounds, thereby:
- (i) forming iron sulfide-containing particles;
- and
- (ii) producing an essentially sulfur-free tail gas stream;
- and
- (g) recycling at least a portion of the iron sulfide-containing particles of step (f) by mixing the particles with the carbonaceous charge fuel of step (a) prior to the partial oxidation of the charge fuel.
11 more elements
A method for producing a synthesis gas comprising:
- (a) partially oxidizing a sulfur- and metal-containing petroleum coke charge fuel in the presence of a temperature moderator and an oxygen-containing gas to produce a sulfur-containing hot synthesis gas and a metal-containing molten slag;
- (b) partially cooling the sulfur-containing synthesis gas via indirect means by passing the synthesis gas through one or more vessels having tube banks containing flowing water;
- (c) scrubbing the partially cooled sulfur-containing synthesis gas with aqueous scrubbing liquor to remove particulates and further cool the synthesis gas;
- (d) further scrubbing the partially cooled sulfur-containing synthesis gas with a scrubbing liquor to produce:
- (i) a fuel gas stream with a substantially reduced sulfur content;
- and
- (ii) an off-gas stream comprising sulfur-containing compounds;
- (e) directing the off-gas stream comprising sulfur-containing compounds to a Claus process unit to produce elemental sulfur and a tail gas stream comprising residual amounts of sulfur-containing compounds;
- (f) contacting the tail gas stream with particles comprising iron-containing compounds, thereby:
- (i) forming iron sulfide-containing particles;
- and
- (ii) producing an essentially sulfur-free tail gas stream;
- and
- (g) recycling at least a portion of the iron sulfide-containing particles of step (f) by mixing the particles with the petroleum coke charge fuel of step (a) prior to the partial oxidation of the charge fuel.
11 more elements
A method for producing a synthesis gas comprising:
- (a) partially oxidizing a sulfur- and metal-containing petroleum coke charge fuel in the presence of a temperature moderator and an oxygen-containing gas to produce a sulfur-containing hot synthesis gas and a metal-containing molten slag;
- (b) partially cooling the sulfur-containing synthesis gas via direct means by contacting the synthesis gas with water in a quenching vessel;
- (c) scrubbing the partially cooled sulfur-containing synthesis gas with aqueous scrubbing liquor to remove particulates and further cool the synthesis gas;
- (d) further scrubbing the partially cooled sulfur-containing synthesis gas with a scrubbing liquor to produce:
- (i) a fuel gas stream with a substantially reduced sulfur content;
- and
- (ii) an off-gas stream comprising sulfur-containing compounds;
- (e) directing the off-gas stream comprising sulfur-containing compounds to a Claus process unit to produce elemental sulfur and a tail gas stream comprising residual amounts of sulfur-containing compounds;
- (f) contacting the tail gas stream with particles comprising iron-containing compounds, thereby:
- (i) forming iron sulfide-containing particles;
- and
- (ii) producing an essentially sulfur-free tail gas stream;
- and
- (g) recycling at least a portion of the iron sulfide-containing particles of step (f) by mixing the particles with the petroleum coke charge fuel of step (a) prior to the partial oxidation of the charge fuel.
11 more elements
A method for producing a synthesis gas comprising:
- (a) partially oxidizing a sulfur- and metal-containing petroleum coke charge fuel in the presence of a temperature moderator and an oxygen-containing gas to produce a sulfur-containing hot synthesis gas and a metal-containing molten slag;
- (b) partially cooling the sulfur-containing synthesis gas via indirect means by passing the synthesis gas through one or more vessels having tube banks containing flowing water;
- (c) scrubbing the partially cooled sulfur-containing synthesis gas with aqueous scrubbing liquor to remove particulates and further cool the synthesis gas;
- (d) further scrubbing the partially cooled sulfur-containing synthesis gas with a scrubbing liquor to produce:
- (i) a fuel gas stream with a substantially reduced sulfur content;
- and
- (ii) an off-gas stream comprising sulfur-containing compounds;
- (e) directing a first portion of the off-gas stream comprising sulfur-containing compounds to a Claus process unit to produce elemental sulfur and a tail gas stream comprising residual amounts of sulfur-containing compounds;
- (f) diverting a second portion of the off-gas stream for admixture with the tail gas stream exiting the Claus process unit;
- (g) contacting the tail gas stream-off-gas stream mixture of step (f) with particles comprising iron-containing compounds, thereby:
- (i) forming iron sulfide-containing particles;
- and
- (ii) producing an essentially sulfur-free tail gas stream;
- and
- (h) recycling at least a portion of the iron sulfide-containing particles of step (g) by mixing the particles with the petroleum coke charge fuel of step (a) prior to the partial oxidation of the charge fuel.
12 more elements
A method for producing a synthesis gas comprising:
- (a) partially oxidizing a sulfur- and metal-containing petroleum coke charge fuel in the presence of a temperature moderator and an oxygen-containing gas to produce a sulfur-containing hot synthesis gas and a metal-containing molten slag;
- (b) partially cooling the sulfur-containing synthesis gas via direct means by contacting the synthesis gas with water in a quenching vessel;
- (c) scrubbing the partially cooled sulfur-containing synthesis gas with aqueous scrubbing liquor to remove particulates and further cool the synthesis gas;
- (d) further scrubbing the partially cooled sulfur-containing synthesis gas with a scrubbing liquor to produce:
- (i) a fuel gas stream with a substantially reduced sulfur content;
- and
- (ii) an off-gas stream comprising sulfur-containing compounds;
- (e) directing a first portion of the off-gas stream comprising sulfur-containing compounds to a Claus process unit to produce elemental sulfur and a tail gas stream comprising residual amounts of sulfur-containing compounds;
- (f) diverting a second portion of the off-gas stream for admixture with the tail gas stream exiting the Claus process unit;
- (g) contacting the tail gas stream-off-gas stream mixture of step (f) with particles comprising iron-containing compounds, thereby:
- (i) forming iron sulfide-containing particles;
- and
- (ii) producing an essentially sulfur-free tail gas stream;
- and
- (h) recycling at least a portion of the iron sulfide-containing particles of step (g) by mixing the particles with the petroleum coke charge fuel of step (a) prior to the partial oxidation of the charge fuel.
12 more elements
Dependencies are inferred from the claim text.