A method of capturing waste heat produced in a gas liquification process, comprising liquefying a feed gas by heat exchange with a refrigerant, compressing the spent refrigerant in a compressor C1, C2, and capturing waste heat from the compression process (such as by heat exchanger E4) before liquefying the compressed refrigerant fluid. The refrigerant fluid is then pumped with pump P1 to a higher pressure, then superheated with the waste heat from the compression process (from heat exchanger E4). The superheated compressed refrigerant is used to power a mechanical process, such as a work expander X1, which may also generate electrical power.
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