New experimental data for absorption of SO₂ into DMA solution

Abstract

Removal of SO2 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 SO2 into dimethyl amine (DMA) solution from simulated gas stream as absorption of SO2 in DMA solution yields an ionic liquid. The effects of DMA concentration, initial SO2 concentration, absorbent temperature, and the initial pH value of absorbent on SO2 removal were investigated by using DMA solution. The experimental results showed that the SO2 saturation uptake increased with increase in absorbent concentration. The maximum removal efficiency of approximately 100% was observed at 9.32 mol/dm3 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 SO2 in inlet gas stream. The lethal air pollutant SO2 is an acidic gas emitted from combustion of fossil fuel. The removal of SO2 from flue gas streams was investigated through absorption by using an organic solvent DMA. Absorption of SO2 into DMA gives di‐methyl ammonium N,N‐dimethyl amidosulfinate an ionic liquid. The absorption of SO2 using DMA has dual benefits in terms of resource generation as ionic liquid production resulting in omission of absorbent regeneration step and SO2 emission control from waste gas stream. The value of kLa increases with increasing partial pressure of SO2 in inlet gas stream. The DMA showed an excellent performance on SO2 absorption. © 2016 American Institute of Chemical Engineers Environ Prog, 35: 1298–1304, 2016

Absorption of SO2 in Furoate Ionic Liquids/PEG200 Mixtures and Thermodynamic Analysis

“…In addition, an electronic balance (Mettler-Toledo AL204) with standard uncertainty of 0.0002 g was used to determine the mass of absorbents added into the EC. In a typical run, a known amount of absorbent (w) was placed into EC, and the air in the whole system was wiped off using the oil pump (6). The temperature of water bath 2 for GR was always kept at 300.15 K, while the other for EC was kept at each desired temperature.…”

“…Nowadays, many new substances and materials have been studied to capture SO 2 from flue gas such as organic solvents, − deep eutectic solvents (DESs), metal–organic frameworks (MOFs), supported ionic liquid phase materials, , etc. However, the practical utilization of these are subject to secondary pollution, high cost of the operation processes, unknown toxicity, loss of structural integrity, limited reusability of the absorbents, and so on.…”