Air Products and Chemicals, Inc.

Andrew David Wright

Jeffrey Kloosterman

Kevin Boyle Fogash

Vincent White

Jeffrey Raymond Hufton

Jeffrey William Kloosterman

Timothy Christopher Golden

Charles Linford Schaffer

Mohammad Ali Kalbassi

Christopher James Raiswell

William Paul Schmidt

Paul Higginbotham

Edward Landis Weist, Jr

Shubhra Jyoti Bhadra

Daniel Patrick Zwilling

Fabrice Amy

Methods and apparatuses for separating COand sulfur-containing compounds from a synthesis gas obtained from gasification of a carbonaceous feedstock. The primary separating steps are performed using a sour pressure swing adsorption (SPSA) system, followed by an acid gas enrichment system and a sulfur removal unit. The SPSA system includes multiple pressure equalization steps and a rinse step using a rinse gas that is supplied from a source other than directly from one of the adsorber beds of the SPSA system.

Sour pressure swing adsorption process

A feed gas comprising CO, HS and His treated to produce an H-enriched product and an HS-lean, COproduct. The feed gas is separated to provide the H-enriched product and a stream of sour gas. The stream of sour gas is divided into two parts, one of which is processed in an HS removal system to form one or more streams of sweetened gas, and the other of which bypasses the HS removal system, the stream(s) of sweetened gas and the sour gas bypassing the HS removal system then being recombined to form the HS-lean, COproduct gas. The division of the sour gas between being sent to and bypassing the HS removal system is adjusted responsive to changes in the HS content of the sour gas, so as to dampen or cancel the effects of said changes on the HS content of the HS-lean, COproduct gas.

Method and apparatus for adjustably treating a sour gas

Both power and Hare produced from a gaseous mixture, comprising Hand CO, using first and second pressure swing adsorption (PSA) systems in series. The gaseous mixture is fed at super-atmospheric pressure to the first PSA system, which comprises adsorbent that selectively adsorbs COat said pressure, and COis adsorbed, thereby providing an H-enriched mixture at super-atmospheric pressure. A fuel stream is formed from a portion of the H-enriched mixture, which is combusted and the combustion effluent expanded to generate power. Another portion of the H-enriched mixture is sent to the second PSA system, which comprises adsorbent that selectively adsorbs COat super-atmospheric pressure, and COis adsorbed, thereby providing a high purity Hproduct. In preferred embodiments, the division of H-enriched mixture between forming the fuel stream and being fed to the second PSA system is adjustable.

Method and apparatus for producing power and hydrogen

Carbon monoxide (CO) may be removed from flue gas generated by oxyfuel combustion of a hydrocarbon or carbonaceous fuel, by contacting the flue gas, or a CO-containing gas derived therefrom, at a first elevated temperature, e.g. at least 80&#xb0; C., and at a first elevated pressure, e.g. at least 2 bar (0.2 MPa), with at least one catalyst bed comprising a CO-oxidation catalyst in the presence of oxygen (O) to convert CO to carbon dioxide and produce carbon dioxide-enriched gas. The carbon dioxide produced from the CO may be recovered from the carbon dioxide-enriched gas using conventional carbon dioxide recovery techniques. NO in the flue gas may also be oxidized to nitrogen dioxide (NO) and removed using conventional NOremoval techniques, or may be reduced in the presence of a reducing gas to nitrogen (N) which does not have to be removed from the gas.

Treatment of flue gas from an oxyfuel combustion process

A feed stream, comprising hydrogen sulphide (HS), carbon dioxide (CO), hydrogen (H) and, optionally, carbon monoxide (CO), is separated into at least a COproduct stream and an Hor Hand CO product stream. The stream is separated using a pressure swing adsorption system, an HS removal system and a further separation system, which systems are used in series to separate the stream. The method has particular application in the separation of a sour (i.e. sulphur containing) syngas, as for example produced from the gasification of solid or heavy liquid carbonaceous feedstock.

Separation of a sour syngas stream

A gaseous mixture, comprising CO, H, HS and optionally CO, is separated into an Hor Hand CO product stream (H/CO product stream), and a COenriched stream containing at least one combustible component selected from HS, H, CO and any additional combustible components present in the gaseous mixture. A support fuel stream, comprising one or more combustible components, is combusted to form a stable flame, and the COenriched stream and flame are contacted in the presence of sufficient Oto combust all or substantially all of the combustible component(s) present in said COenriched stream. A COproduct stream is formed from said combustion effluent. The support fuel stream may be generated from the process of generating or separating the gaseous mixture or from the H/CO product stream. Where the COenriched stream contains HS, the support fuel stream may also be a stream obtained off-site that comprises HS.

Method of treating a gaseous mixture comprising hydrogen, carbon dioxide and hydrogen sulphide

A feed gas comprising CO, HS and His treated to produce an H-enriched product and a COproduct. The feed gas is separated by pressure swing adsorption to provide a stream of the H-enriched product, and two streams of sour gas depleted in Hand enriched in HS and COrelative to the feed gas. One of the streams of sour gas is processed in an HS to elemental sulfur conversion system, in which HS in the sour gas is converted to elemental sulfur order to obtain a stream of sweetened gas, from which the COproduct is formed. The other of said streams of sour gas is processed in an oxidation system, in which HS in the sour gas is oxidized to SO(SOand SO) which is introduced into the HS to elemental sulfur conversion system.

Method and apparatus for treating a sour gas

NOmay be removed from a carbon dioxide feed gas comprising NOand at least one 'non-condensable' gas as contaminants by passing the feed gas at a first elevated pressure through a first adsorption system that selectively adsorbs at least NOto produce at least substantially NO-free carbon dioxide gas. The adsorption system is at least partially regenerated using a carbon dioxide-rich gas recovered from the substantially NO-free carbon dioxide gas after purification. The invention has particular application in removing NOand water from flue gas generated by oxyfuel combustion.

Recycle TSA regen gas to boiler for oxyfuel operations

The concentration of adsorbate in the feed gas to an on-stream bed of a cyclical swing adsorption process is monitored and the data processed to predict the time required to complete the on-stream mode of that bed and the purge flow rate and/or other regeneration mode operating condition of the concurrently off-stream bed is modified in response to changes in said predicted time whereby the regeneration mode of the off-steam bed is completed at the same time as the on-stream mode of the concurrent on-stream bed.

Cyclical swing adsorption processes

An improved control scheme is set forth for an adsorption process that removes water and carbon dioxide (CO) from a feed gas using a hybrid of both temperature swing (i.e. TSA) and pressure swing (PSA) to regenerate the adsorbent. The control scheme comprises adjusting the quantity of heat to be provided by the regeneration gas as a function of temperature data taken within a strategic portion of the water selective adsorbent zone. The strategic portion corresponds to the location for the desired transition from regeneration by temperature swing, to regeneration by pressure swing. In a preferred embodiment of the present invention, said quantity of regeneration heat is also adjusted as a function of the water content of the feed gas.

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Guildford, United Kingdom

Andrew David Wright