Patent ID: 7096688
Filing Date: 2006-08-29
Classification: F25J

Abstract:
1. A process for liquefying a natural gas ( 1 ), under pressure, containing methane and C 2 and higher hydrocarbons, said process comprising: (a) a first step I, in which the natural gas ( (b) a second step II, in which the cooled natural gas ( the second coolant ( characterized in that the ethylene and ethane proportions in the second coolant are adjusted according to the intake pressure of the natural gas, and in that the ratio of the ethylene content in the second coolant ( 103 ), expressed in mol %, and the total content in ethylene and ethane in this same second coolant, expressed in mol %, to the total content in ethylene and ethane in this same second coolant, expressed in mol %, is greater than 25% when the natural gas is available at a pressure below 35 bar.