{HEAD ~ The present invention} provides a method and {TAIL ~ system} for cooling and liquefying a methane rich gas stream which is at superatmospheric pressure wherein a cascade two refrigeration cycle system is utilized in which an initial refrigeration cycle including a single component refrigerant cools both the methane rich gas stream and the second refrigeration cycle which comprises a multicomponent refrigerant 
provides
{ HEAD ~ The present invention } provides a method and { TAIL ~ system } for cooling and liquefying a methane rich gas stream which is at superatmospheric pressure wherein a cascade two refrigeration cycle system is utilized in which an initial refrigeration cycle including a single component refrigerant cools both the methane rich gas stream and the second refrigeration cycle which comprises a multicomponent refrigerant
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