Chemical Process
Double Contact Double Absorption (DCDA) process is the most recent process for the manufacture of

Ammonium sulphate
Nitric acid
Hydrochloric acid
Sulphuric acid

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Chemical Process
Liquefaction of gases can not be done by

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

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