A process of carbon dioxide desorption and biomethane recovery with biogenic carbon dioxide

Abstract

The present invention is related to the process of desorption of carbon dioxide from water without any stripping medium such as air or any process gas and further recovery of biogenic carbon dioxide and bio methane for Biogas purification. The production of bio methane and biogenic carbon dioxide is carried out without using air for desorption and using counter-current method. Another aspect of the present invention is the process involves compression of partially desulfurized raw biogas containing hydrogen sulfide and to use chilled water from the top of the column while the gas is introduced from the bottom with absorption column as a twin bed unit where each bed has a height of 2-6 meters with twin bed packed type vessel ranging from ¼ to 2 inches in size to obtain bio methane containing 90-99% methane to achieve the desired water dew point, complying with the fuel standards of the region.