C2+ light hydrocarbons

which are resources with high additional values

can be separated from LNG with low power consumption by efficiently utilizing its cryogenic energy

and LNG is gasified meanwhile.A novel light hydrocarbons separation process is proposed in this paper: the demethanizer works at higher pressure

thus the methane-rich natural gas can be compressed to pipeline pressure with low power consumption; the deethanizer works at atmosphere pressure

consequently liquefied ethane and LPG (liquefied petroleum gas

i.e.C3+) at atmosphere pressure can be produced directly

which are easy to be stored and transported.The heat consumption of the reboiler in the demethanizer is provided by the combustion of the separated natural gas

which account for about 1% of the total amount; the cold energy of the condenser in the deethanizer is provided by the cryogenic energy of LNG.The recovery rate is more than 90% for light hydrocarbons

and about 85% for ethane.On the basis of one typical feed gas composition

the effects of the ethane content and the ethane price to the economics of the process are studied.The results show that recovering light hydrocarbons from LNG by this process can gain great profits.