A method of absorbing a selected component from an incoming flowing gas stream, wherein said absorption occurs across the surface of an aqueous bubbly froth comprising a liquid solvent for said selected component, said froth being intermixed with numerous micro-droplets formed from causing bubbles in said froth to burst; the method comprising the step of flowing said gas stream downwardly into a vertically extending reaction vessel, wherein said reaction vessel has an upper inlet for said flowing gas stream, a lower outlet for said flowing gas stream, and a solvent injector mounted inside the vessel near the top of the vessel for distributing liquid solvent downwardly; wherein said reaction vessel carries a series of plurality of vertically spaced apart, ridge shaped screens; wherein each of said screens extends horizontally from side wall to side wall, extending transversely across said reaction vessel; the method being characterized by the steps of: pressurizing said flowing gas stream in said reaction vessel; injecting said liquid solvent into said reaction vessel, to thereby form said aqueous froth comprising said solvent adjacent the surface of said ridge shaped screens as said gas stream flows through said ridge shaped screens, wherein said ridge shaped screens have vertical surface regions which lie in planes within 20° of the direction of the gas flow, wherein the vertical surface regions form side walls of ridges, wherein the ridge shaped screens also have an open surface region in a direction transverse to the direction in which said gas stream flows; causing said solvent to accumulate on said ridge shaped screens, thereby causing said gas stream to increase in velocity through open regions of said screens and to increase in turbulence below said screens, and causing said accumulated solvent to periodically separate from said ridge shaped screens and enter said turbulent gas flow below said screens, thereby creating pulses of solvent entering said flowing gas stream, whereby the efficiency of absorption of said selected component is increased. pressurizing said flowing gas stream in said reaction vessel; injecting said liquid solvent into said reaction vessel, to thereby form said aqueous froth comprising said solvent adjacent the surface of said ridge shaped screens as said gas stream flows through said ridge shaped screens, wherein said ridge shaped screens have vertical surface regions which lie in planes within 20° of the direction of the gas flow, wherein the vertical surface regions form side walls of ridges, wherein the ridge shaped screens also have an open surface region in a direction transverse to the direction in which said gas stream flows; causing said solvent to accumulate on said ridge shaped screens, thereby causing said gas stream to increase in velocity through open regions of said screens and to increase in turbulence below said screens, and causing said accumulated solvent to periodically separate from said ridge shaped screens and enter said turbulent gas flow below said screens, thereby creating pulses of solvent entering said flowing gas stream, whereby the efficiency of absorption of said selected component is increased.