Absorption Properties and Spectroscopic Studies of Dilute Sulfur Dioxide in Aqueous Glycerol Solutions

Abstract

Isothermal gas−liquid equilibrium (GLE) data were reported at 298.15 K and 123.15 kPa for the absorption of dilute SO 2 in aqueous glycerol solutions, in which SO 2 partial pressures are calculated in the range of (0 to 140) Pa. The GLE data were obtained with uncertainties within ±0.02 K for temperatures, ± 0.133 kPa for total pressures, ± 3.5% for SO 2 concentration in the gas phase, and ±5% for SO 2 concentration in the liquid phase. The measurements showed that the solubility of dilute SO 2 in the system of glycerol (1) + water (2) increases with the increasing glycerol concentrations in the whole composition, and the solubility of SO 2 in the system of glycerol (1) + water (2) presents an extreme minimum of 60.1 mg•L −1 at the mass fraction of w 1 = 1.00 when SO 2 in the gas phase is designed at y SO2 = 5 × 10 −4 . In addition, UV, FTIR (Fourier transform infrared), 1 H NMR, and fluorescence spectra in the absorption processes of SO 2 in the system of glycerol (1) + water (2) were investigated to present important absorption mechanism. Based on the spectral results obtained, the possibility of intermolecular hydrogen bond formation by hydroxyl oxygen atoms in the glycerol molecule with hydrogen atom in the H 2 O molecule and S•••O interaction formation by hydroxyl oxygen atom in the glycerol molecule with sulfur atom in the SO 2 molecule are discussed.

Glycerin/NaOH Aqueous Solution as a Green Solvent System for Dissolution of Cellulose

“…This is to say, any molecules with hydrogen-bonding acceptors are possible candidate for dissolving cellulose. Hydroxyl groups in a typical environmentally friendly molecule such as glycerin, could be alternative for the urea or thiourea to stable the cellulose solution [24].…”

Mass Transfer Performance for Low SO2 Absorption into Aqueous N,N′-Bis(2-hydroxypropyl)piperazine Solution in a θ-Ring Packed Column

“…Many techniques for removing SO 2 have been put forward. Some conventional procedures, such as ammonia scrubbing and limestone scrubbing, have some intrinsic shortcomings, involving a larger water requirement, high capital and operating costs, secondary pollution, and poor quality of byproduct. , The interest in flue gas desulfurization (FGD) with organic amine aqueous solution stems from the fact that it has high desulfurization efficiency, high utilization of SO 2 recovery, excellent selective for SO 2 , and no recontamination. − Recently, the commonly used organic amines are ethylenediamine and alkanolamines . Ethylenediamine has higher efficiency for desulfurization, but it has relatively high vapor pressure, which can bring about significant solvent loss and vaporization .…”