GAS SEPARATION Russian patent published in 2014 - IPC C07C7/00 F25J3/00 

FIELD: oil-and-gas industry.

SUBSTANCE: proposed process includes gas feed to absorber. Cooled absorbent is fed to absorber top, dry gas being diverted therefrom and saturated absorbent being discharged from absorber bottom to rectifier tower. Propane-butane fraction is diverted the rectifier top and used as reflux. Gas gasoline is diverted is off-stream via evaporation section while absorbent is discharged from rectifier bottom. After cooling, said absorbent is fed to absorber top and, then, heat is fed to its bottom, rectifier bottom and heat evaporation section bottom. Fluid at absorber lower trays is heated by rectifier column residue preheated in boiler and fed to absorber bottom.

EFFECT: power savings.

2 dwg, 2 tbl