F - Mech Eng,Light,Heat,Weapons – 25 – J
Patent
F - Mech Eng,Light,Heat,Weapons
25
J
F25J 3/06 (2006.01) F25J 3/02 (2006.01) F25J 3/08 (2006.01)
Patent
CA 2132797
PROCESS FOR PURIFYING LIQUID NATURAL GAS Abstract of the Invention The present invention is directed to a process for increasing the methane content of liquid natural gas to provide an essentially pure liquid methane product. In the process, a liquid natural gas feed stream is introduced into a first heat exchanger in indirect heat exchange with a purified methane vapor stream so as to liquify the purified methane vapor stream and to provide a purified liquid methane product. The heat exchange results in increasing the temperature of the liquid natural gas feed stream to a temperature just below the dew point of the liquid natural gas feed stream so as to partially vaporize the liquid natural gas feed stream to provide a mixture of a major amount of substantially pure methane vapor and a minor amount of liquid containing methane and higher hydrocarbons. The mixture of vapor and liquid from the first heat exchanger is transferred to a low pressure separator to provide a liquid bottom fraction and a purified methane top vapor fraction. At least a portion of the liquid bottom fraction and all of the top vapor fraction are transferred to a second heat exchanger in indirect heat exchange with the vapor fraction after the vapor fraction has been processed to change the temperature and pressure of the vapor fraction. The vapor fraction exiting from the second heat exchanger is transferred through a compressor and an aftercooler to provide a processed purified methane vapor fraction which is returned to the second heat exchanger for use as a heat exchange medium in the second heat exchanger. The processed vapor fraction after its return through the second heat exchanger is introduced into the first heat exchanger to provide a heat exchange medium for the partial vaporization of the liquid natural gas feed stream and to provide a purified liquid methane stream.
Engdahl Gerald E.
Rhoades George D.
Weber Ronald C.
Liquid Carbonic Corporation
Macrae & Co.
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