Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Carbon dioxide or hydrogen sulfide component
Reexamination Certificate
1998-06-05
2001-01-16
Dunn, Tom (Department: 1754)
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Carbon dioxide or hydrogen sulfide component
C423S210000, C423S242700, C423S243050, C423S576400, C423S576700, C252S373000, C095S235000, C095S236000
Reexamination Certificate
active
06174507
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to removing acid gases from syngas, and more particularly to separating and recycling the resulting particulate solids to the gasification reactor.
BACKGROUND OF THE INVENTION
The production of syngas from the solid and liquid carbonaceous fuels, especially coal, coke, and liquid hydrocarbon feeds, has been utilized for a considerable period of time and has recently undergone significant improvements due to the increased energy demand. Syngas may be produced by heating carbonaceous fuels with reactive gases, such as air or oxygen, often in the presence of steam in a gasification reactor to obtain the fuel gas which is withdrawn from the gasification reactor. The syngas is then subjected to several cleansing operations to rid it of various contaminants which are formed or liberated from the feed during the gasification operation. These materials can readily become contaminate down stream process units if not properly treated during the gasification operation.
For example, materials often found in the syngas include hydrogen sulfide, ammonia, cyanides, and particulates in the form of carbon and trace metals. The extent of the contaminants in the feed is determined by the type of feed and the particular gasification process utilized as well as the operating conditions. In any event, the removal of these contaminants is critical to make gasification a viable process.
As the product gas is discharged from the gasifier, it is usually subjected to a cooling and cleaning operation involving a scrubbing technique wherein the gas is introduced into a scrubber and contacted with a water spray which cools the gas and removes particulates and ionic constituents from the syngas. The initially cooled gas may then be treated to desulfurize the gas prior to utilization of the product gas.
SUMMARY OF THE INVENTION
The invention is a process for separating acid gases from synthesis gas and treating the resulting solids. A mixture comprising synthesis gas and acid gas is contacted with a fluid that reacts with said acid gas to form a slurry of particulate solid dispersed in a fluid and synthesis gas. The slurry comprising fluid and particulate solid is separated from the synthesis gas in a conventional separator or by other means. The slurry is then filtered to separate said particulate solid from said fluid by means of a regenerable filter. The particulate solids are removed from the regenerable filter by back-washing with a back-washing fluid to form a pumpable slurry comprising a mixture of particulate solids and back-washing fluid.
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International Search Report dated Sep. 17, 1998 for PCT/US 98/11743.
Fair Delome D.
Johnson Kay A.
Wallace Paul S.
Dunn Tom
Howrey Simon Arnold & White
Medina Maribel
Reinisch Morris N.
Texaco Inc.
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