Maintaining low carbon monoxide levels in product carbon dioxide
AssigneeUop LLC
InventorsWilliam J. Lechnick, Leonid Bresler, Lamar A. Davis
Life of this patent
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Abstract
A process for maintaining a low carbon monoxide content in a carbon dioxide product that is made in a synthesis gas purification process is disclosed. More particularly, the invention involves an improved process in which a portion of a loaded solvent is sent through a carbon dioxide absorber instead of to a series of carbon dioxide flash drums.
Claims16
A process for separation, recovery and utilization of gas streams comprising sulfur compounds, carbon dioxide and carbon monoxide from a synthesis gas comprising an unshifted synthesis gas or a partially shifted synthesis gas produced from high pressure partial oxidation of a hydrocarbonaceous reactant while removing carbon monoxide from said gas streams and concentrating said CO in a shifted synthesis gas stream, said process comprising:
- a) contacting the synthesis gas with a first liquid solvent in a first carbon dioxide absorber to selectively absorb and remove at least a portion of carbon dioxide from the synthesis gas and to produce a purified synthesis gas;
- b) sending a portion of said first liquid solvent to a second carbon dioxide absorber wherein a fully shifted synthesis gas is contacted with said first liquid solvent mixed with a second liquid solvent to remove CO2 from said shifted synthesis gas to produce a purified shifted synthesis gas and wherein at least a portion of CO from said first liquid solvent is transferred to said purified shifted synthesis gas;
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- c) removing carbon dioxide from a loaded solvent stream to produce a carbon dioxide product stream.
A process for producing a gas stream comprising carbon dioxide and less than 1000 ppm carbon monoxide, said process comprising sending a first synthesis gas stream through a first carbon dioxide absorber wherein said first synthesis gas stream comprises an unshifted or partially shifted synthesis gas and sending a second synthesis gas stream through a second carbon dioxide absorber wherein said second synthesis gas stream is a fully shifted synthesis gas stream or a synthesis gas stream from a sulfur removal section of said process, wherein within said first carbon dioxide absorber and said second carbon dioxide absorber said first synthesis gas stream and said second synthesis gas stream contact a solvent to remove carbon dioxide from said first and said second synthesis gas stream and wherein at least a portion of solvent from said first and said second carbon dioxide absorber is returned to said second carbon dioxide absorber prior to a loaded solvent being sent from said second carbon dioxide absorber to a zone for removal of carbon dioxide from said solvent.
Dependencies are inferred from the claim text.