Combined synthesis gas separation and LNG production method and system
First Claim
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1. A method for separating a feed gas stream containing carbon monoxide, hydrogen and methane into a gas stream containing carbon monoxide and hydrogen and a liquefied gas stream containing methane, the method comprising:
- a) cooling the feed gas stream to a temperature from about −
145 to about −
160°
C. at a pressure from about 4 to about 6 MPa to produce a cold mixed gas and liquid gas stream; and
,b) fractionating the cold mixed gas and liquid stream in a fractionator to produce a carbon monoxide and hydrogen stream (CO/H2) and a liquefied gas stream comprising methane.
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Abstract
A method and system for the separation of a synthesis gas and methane mixture which contains carbon monoxide, hydrogen and methane with the process producing synthesis gas and liquid natural gas (LNG).
79 Citations
13 Claims
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1. A method for separating a feed gas stream containing carbon monoxide, hydrogen and methane into a gas stream containing carbon monoxide and hydrogen and a liquefied gas stream containing methane, the method comprising:
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a) cooling the feed gas stream to a temperature from about −
145 to about −
160°
C. at a pressure from about 4 to about 6 MPa to produce a cold mixed gas and liquid gas stream; and
,b) fractionating the cold mixed gas and liquid stream in a fractionator to produce a carbon monoxide and hydrogen stream (CO/H2) and a liquefied gas stream comprising methane. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for separating a feed gas stream containing carbon monoxide, hydrogen and methane into a carbon monoxide/hydrogen (CO/H2) gas stream containing carbon monoxide and hydrogen and a liquefied gas stream containing methane, the system comprising:
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a) a refrigeration heat exchanger having a feed gas stream inlet, a refrigerant inlet, a refrigerant expansion valve, a spent refrigerant outlet and a cold mixed gas and liquid stream outlet; and
,b) a fractionator having a cold mixed gas and liquid stream inlet in fluid communication with the refrigeration heat exchanger cold mixed gas and liquid stream outlet, a CO/H2 gas stream outlet and a liquefied gas stream outlet. - View Dependent Claims (8, 9)
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10. A system for separating a feed gas stream containing carbon monoxide, hydrogen and methane into a carbon monoxide/hydrogen (CO/H2) gas stream containing carbon monoxide and hydrogen and a liquefied gas stream containing methane, the system comprising:
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a) a refrigeration heat exchanger having a feed gas stream inlet, a refrigerant inlet, a refrigerant expansion valve, a spent refrigerant outlet and a cold mixed gas and liquid stream outlet; b) a cold separator having a cold mixed gas and liquid stream inlet in fluid communication with the cold mixed gas and liquid stream outlet from the refrigerant heat exchanger and having a cold gas stream outlet and a cold liquid stream outlet; c) a fractionator having a cold gas stream inlet in fluid communication with the cold gas stream outlet from the cold separator and adapted to pass the cold gas stream into the fractionator, the fractionator having a cold liquid stream inlet in fluid communication with the cold liquid outlet stream and adapted to pass the cold liquid stream into the fractionator, a fractionator overhead gas outlet, a reflux inlet and a liquefied gas stream outlet; d) a CO/H2 gas stream chilling heat exchanger adapted to pass a fractionator overhead gas stream in heat exchange contact with a chilling stream to produce a chilled CO/H2 gas stream via a chilled CO/H2 gas stream outlet; e) a reflux drum having at least one of a fractionator overhead gas inlet and a chilled CO/H2 gas stream inlet, a reflux drum outlet in fluid communication with the fractionator reflux inlet and a reflux drum overhead gas outlet; f) a liquefied gas stream heat exchanger in fluid communication with the reflex drum overhead gas outlet and the liquefied gas stream from the fractionator liquefied gas stream outlet to warm the reflux drum overhead gas outlet stream to produce a warmed reflux drum overhead gas stream and a chilled liquefied gas stream for discharge as a product stream; and
,g) a first compressor in fluid communication with and driven by the cold gas stream from the cold gas stream outlet from the cold separator to produce an expanded cold gas stream and drive a second compressor in fluid communication with the warmed reflux drum overhead gas stream to compress the reflux drum overhead gas stream to produce a CO/H2 gas stream. - View Dependent Claims (11, 12, 13)
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Specification