Recovery by absorption

Cooler water is also of advantage in the gas processing section. Gas recovery by absorption is improved with lower temperature at constant absorption oil circulation rates. Thus, additional light hydrocarbon may be squeezed from the dry gas, recovering C3+ that would otherwise become refinery fuel. 

Ammonia recovery by absorption in water and distillation. Cryogenic purge gas recovery. The energy consumption is claimed to be 6.7 Gcal/MT of ammonia [123]. 

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