The present invention provides {HEAD ~ a method} and system for cooling and liquefying {TAIL ~ 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 
The present invention provides { HEAD ~ a method } and system for cooling and liquefying { TAIL ~ 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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