The present invention provides a method and system for cooling and liquefying {HEAD ~ a methane rich gas stream} which is at {TAIL ~ 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 a method and system for cooling and liquefying { HEAD ~ a methane rich gas stream } which is at { TAIL ~ 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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