Chemical Process
Hydrogen gas is not produced commercially (for nitrogeneous fertiliser manufacture) by

Its cryogenic separation from coke oven gas
Iron-steam reaction
Electrolysis of water
Steam reforming of naphtha

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Chemical Process
Linde process of gas liquefaction employs

Adiabatic expansion through a throttle valve (Joule-Thomson expansion)
Merely compressing the gas beyond its critical pressure
Adiabatic expansion against a piston or in a turbine
Exchange of heat with colder stream

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