Patent ID: 8062408
Filing Date: 2011-11-22
Classification: B01D

Abstract:
1. A method for separating a targeted gas from a gas stream emitted from a power plant, the method comprising: bringing the gas stream into contact with an absorption solution to preferentially absorb the targeted gas to be separated from the gas stream so that an absorbed gas is present within the absorption solution, providing a gas-rich solution; introducing the gas-rich solution into a stripper; injecting low pressure exhaust steam from a low pressure steam turbine of the power plant into the stripper with the gas-rich solution; stripping the absorbed gas from the gas-rich solution in the stripper using the injected low pressure steam within the stripper to provide a gas stream containing the targeted gas, wherein the stripper is at or near vacuum; condensing water vapor in a gas stream from the stripper in a condenser operating at a pressure lower than the stripper to concentrate the targeted gas: separating condensed water from the concentrated targeted gas; wherein the stripper during said stripping is at a pressure between 1.2 and 14.7 psia, and a temperature T=40˜100° C.