Abstract:The absorption of sulfur dioxide in simulated flue gas by using liquid-containing membrane was investigated. The process of sulfur dioxide desorption from the absorbent of citrate solution was explored. The influence of the gas-phase, and the liquid-phase on absorption efficiency of sulfur dioxide and the influence of ultrasonic frequency, ultrasonic power and stirring speed on desorption efficiency of sulfur dioxide were examined. The results indicate that the absorption efficiency decreases with increasing flow velocity and sulfur dioxide content in gas-phase, and can be improved by increasing the concentration and the pH value of citrate solution. It is concluded that lower ultrasonic frequency results in a better degassing efficiency. The using of ultrasound in desorbing sulfur dioxide from citrate solution improves the desorbing efficiency in the some conditions, without changing the essence of chemical reaction.

Key words: sulfur dioxide; absorption; desorption; membrane; ultrasound; citrate; flue gas desulphurization