Process and system for liquefaction of hydrocarbon-rich gas stream utilizing three refrigeration cycles
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United States of America Patent
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Issued Date -
Jun 24, 2010
app pub date -
Dec 19, 2008
filing date -
Dec 19, 2008
priority date (Note) -
Abandoned
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Abstract
A process is disclosed for liquefying a hydrocarbon-rich gas stream such as natural gas by indirect heat exchange with refrigerants in a cascade of three closed loop refrigeration cycles, namely pre-cooling, liquefaction and subcooling. Each of the closed loop refrigeration cycles utilizes a different refrigerant composition. The pre-cooling cycle utilizes a first mixed refrigerant; the liquefaction cycle utilizes a pure refrigerant; and the subcooling cycle utilizes a second next refrigerant. The refrigerants closely match the enthalpy curve of the hydrocarbon-rich gas, thereby improving the energy efficiency of the liquefaction process.
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