Patent ID: 8840708

Claim:
A method for using a solvent in treating a gas from a landfill, wherein the gas and the solvent have a varying concentration of carbon dioxide, the method comprising: circulating a main current of solvent in a main solvent loop that passes through a main absorber and a flash system such that the main current of solvent flows through the main absorber and through the flash system; diverting a portion of solvent from the main solvent loop to create an offshoot solvent path conveying an ancillary current of solvent and a polishing current of solvent, the ancillary current of solvent flowing through an ancillary absorber, the polishing current of solvent flowing through a polishing absorber; conveying a current of air through the ancillary absorber, thereby exposing the ancillary current of solvent to the current of air; conveying the gas through the main absorber, thereby exposing the gas to the main current of solvent; following conveying the gas through the main absorber, conveying the gas through the polishing absorber, thereby exposing the gas to the polishing current of solvent; after exposing the gas to the polishing current of solvent, injecting the portion of solvent back into the main solvent loop; the main current of solvent extracting carbon dioxide from the gas flowing through the main absorber; the polishing current of solvent extracting carbon dioxide from the gas flowing through the polishing absorber; the flash system releasing carbon dioxide from the main current of solvent flowing through the flash system; and the current of air extracting carbon dioxide from the ancillary current of solvent flowing through the ancillary absorber.