STEAM ASSISTED VACUUM DESORPTION PROCESS FOR CARBON DIOXIDE CAPTURE

摘要

A method for separating gaseous carbon dioxide from a mixture containing said gaseous carbon dioxide as well as further gases different from the gaseous carbon dioxide by cyclic adsorption/desorption using a sorbent material adsorbing said gaseous carbon dioxide, using a unit (1) containing an adsorber structure (6) with said sorbent material, wherein the method comprises the following sequential and in this sequence repeating steps: a) contacting said gas mixture with the sorbent material to allow at least said gaseous carbon dioxide to adsorb on the sorbent material under ambient atmospheric pressure conditions and ambient atmospheric temperature conditions in an adsorption step; b) evacuating said unit (1) to a pressure in the range of 20 - 400 mbarabs and heating said sorbent material in said unit (1) to a temperature in the range of 80 - 130°C in a desorption step; c) re-pressurisation of the unit to ambient atmospheric pressure conditions and actively cooling the sorbent material to a temperature larger or equal to ambient atmospheric temperature; wherein in step (b) steam is injected into the unit (1) to flow-through and contact the sorbent material under saturated steam or superheated steam conditions at the pressure level in said unit (1), and wherein the molar ratio of steam that is injected during the entire step (b) to the gaseous carbon dioxide released in the entire step (b) is less than 20:1.