New Experimental Data for Absorption of SO_2 into DMA Solution

摘要

Removal of SO_2 and its accurate prediction from the flue gases emitted from various chemical industries in a techno-econo-enviro manner is of great importance. The experiments were conducted in a bubble column to study the absorption of SO_2 into dimethyl amine (DMA) solution from simulated gas stream as absorption of SO_2 in DMA solution yields an ionic liquid. The effects of DMA concentration, initial SO_2 concentration, absorbent temperature, and the initial pH value of absorbent on SO_2 removal were investigated by using DMA solution. The experimental results showed that the SO_2 saturation uptake increased with increase in absorbent concentration. The maximum removal efficiency of approximately 100% was observed at 932 mol/dm~3 DMA solution, temperature of 303 K and initial DMA solution pH 11. The mass transfer coefficient based on the liquid phase increases with increasing partial pressure of SO_2 in inlet gas stream. The lethal air pollutant SO_2 is an acidic gas emitted from combustion of fossil fuel. The removal of SO_2 from flue gas streams was investigated through absorption by using an organic solvent DMA. Absorption of SO_2 into DMA gives dimethyl ammonium N,N-dimethyl amidosulfinate an ionic liquid. The absorption of SO_2 using DMA has dual benefits in terms of resource generation as ionic liquid production resulting in omission of absorbent regeneration step and SO_2 emission control from waste gas stream. The value of k_La increases with increasing partial pressure of SO_2 in inlet gas stream. The DMA showed an excellent performance on SO_2 absorption.