A method for cooling and liquefying {HEAD ~ a methane rich gas stream}, such as {TAIL ~ natural gas}, is set forth wherein the methane rich gas stream is heat exchanged against a single component refrigerant, such as propane, in a closed cycle and a multicomponent refrigerant, such as lower hydrocarbons, in another closed cycle in which the single component refrigerant is used to cool the multicomponent refrigerant subsequent to the multicomponent refrigerants compression and between stages of its compression 
A method for cooling and liquefying { HEAD ~ a methane rich gas stream } , such as { TAIL ~ natural gas } , is set forth wherein the methane rich gas stream is heat exchanged against a single component refrigerant , such as propane , in a closed cycle and a multicomponent refrigerant , such as lower hydrocarbons , in another closed cycle in which the single component refrigerant is used to cool the multicomponent refrigerant subsequent to the multicomponent refrigerants compression and between stages of its compression
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