Solubility Of Dilute SO2 Research Articles

Solubility of dilute SO2 in binary system of polyethylene glycol 200 and dimethyl sulfoxide as a function of liquid composition and system's spectroscopic studies

In a previous work, the binary mixture of polyethylene glycol 200 (PEG) and dimethyl sulfoxide (DMSO) was used as a promising medium for absorption of SO2 (J. Chem. Eng. Data2015, 60, 2135). As a continuation of the previous study, the solubility data of dilute SO2 in the binary mixture of PEG+DMSO were measured by isothermal gas-liquid equilibrium experiments at 298.15K and 122.66kPa with SO2 partial pressure below 128Pa in the gas phase. The solubility of SO2 decreased gradually with increasing mass fraction of PEG in the mixtures. We found that the absorption process, which obeyed Henry's law within the given experimental conditions, was physical absorption, and Henry's constants were further calculated from solubility data. Furthermore, to obtain important information about the absorption mechanism, the inter-molecular interactions among SO2, PEG, and DMSO were investigated by UV, FTIR, and 1H NMR spectroscopic techniques. Spectral results showed that the interactions among SO2, PEG, and DMSO were resulted from both intermolecular hydrogen bonding and the O→S charge-transfer interaction.

Solubility and Spectral Studies for SO2 in a Binary System of Triethylene Glycol + Dimethyl Sulfoxide at T = (298.15, 303.15, and 308.15) K and p = 123.15 kPa

In this work, isothermal gas–liquid equilibrium (GLE) data were measured for the mixture SO2 + N2 in the system of triethylene glycol (TEG) + dimethyl sulfoxide (DMSO) at T = (298.15, 303.15, and 308.15) K and p = 123.15 kPa. Henry’s law constants (HLCs) were obtained by fitting the linear slope of the GLE data. The results indicated that the solubility of dilute SO2 in the system of TEG + DMSO increased with the increasing DMSO concentrations, and HLCs decreased with the increasing temperatures. The regeneration experimental results showed that the absorption of SO2 in the binary system was reversible, and the solvent could be reused without significant loss of absorption capacity. Additionally, FTIR, UV–vis, and 1H NMR spectral results indicated that intermolecular hydrogen bonding association among TEG, DMSO, and SO2 molecules was formed.

Absorption, desorption and spectroscopic investigation of sulfur dioxide in the binary system ethylene glycol + dimethyl sulfoxide

Isothermal gas–liquid equilibrium (GLE) data were measured at 298.15K and 122.66kPa for dilute SO2 in the binary system ethylene glycol (EG)+dimethyl sulfoxide (DMSO), in which SO2 partial pressures were calculated in range of (0–130)Pa. The solubility of dilute SO2 in the binary system gradually increased with the increasing DMSO concentration in the whole composition. Based on the GLE data, Henry’s law constants (HLC) of dilute SO2 in the binary system EG (1)+DMSO (2) were obtained. The regeneration experiments showed that the 97.6% SO2 could be separated from the dissolving SO2 solution at 80°C and bubbling N2 within 30min; meanwhile, SO2 desorption ran smoothly and solubility of SO2 no significant dropped after five-successive absorption–desorption cycles. Furthermore, to obtain important reaction mechanism, the intermolecular interaction among SO2, EG, and DMSO were investigated by UV–vis, FTIR, and 1H NMR spectroscopic techniques. Spectral results showed that the interaction among EG, DMSO, and SO2 were resulted from both the O→S charge-transfer interaction and intermolecular hydrogen bonding.

Solubility for dilute sulfur dioxide, viscosities, excess properties, and viscous flow thermodynamics of binary system N,N-dimethylformamide + diethylene glycol

In this paper, isothermal gas–liquid equilibrium data were measured for the system SO2+N2 in N,N-dimethylformamide (DMF)+diethylene glycol (DEG) at T=(298.15, 303.15, 308.15, 313.15, and 318.15)K and p=122.66kPa. Based on these data, Henry's law constants were obtained by fitting the linear slope of GLE data. The results indicated the solubility of dilute SO2 in the system DMF+DEG increases with increasing DMF concentration. From the GLE data of dilute SO2 in pure DMF and pure DEG, the thermal parameter of dissolving SO2 in pure DMF and pure DEG was obtained. Meanwhile, density, ρ, and viscosities, ν, for the binary mixtures of DMF+DEG were measured over the whole concentration range at T=(298.15, 303.15, 308.15, 313.15, and 318.15)K. From the experimental density and viscosity data, the excess molar volume, VmE, and viscosity deviations, Δν, were calculated and the calculated results were fitted to a Redlich–Kister equation to obtain the coefficients and estimate the standard deviations between the experimental and calculated quantities. The values of VmE and Δν were negative at all experimental temperatures and components. From the kinematic viscosity data, enthalpy of activation for viscous flow (ΔH*), entropy of activation for the viscous flow (ΔS*), and Gibbs free energy of activation for viscous flow (ΔG*) were calculated.

Solubility and Henry's law constant of sulfur dioxide in aqueous polyethylene glycol 300 solution at different temperatures and pressures

In this work, isothermal gas–liquid equilibrium (GLE) data are reported for the system of SO2+N2+polyethylene glycol (PEG) 300+water (H2O) at five different reaction temperatures (from 298.15 to 318.15K) and different pressures (from 110.34 to 142.03kPa) with SO2 partial pressures in the range of 0 to 180Pa. Measurements were carried out by a saturation method using a glass absorption apparatus, which was controlled at constant temperatures by a thermostatic circulation bath with a Beckmann thermometer. The GLE data were obtained with uncertainties within ±0.02K for temperature, ±0.1kPa for total pressures, and ±0.05 for SO2 concentration in the gas phase and ±0.003 for SO2 concentration in the liquid phase. The measurements showed that the solubility of dilute SO2 in the system of PEG (1)+water (2) increased the with increasing PEG concentration in the mass fraction range of w1=(0.50–1.00). The solubility of SO2 in the system of PEG (1)+water (2) presented an extreme minimum at the mass fraction of w1=0.50 of 152.3gm−3 when SO2 in the gas phase was designed at ySO2=5×10−4. The solubility of dilute SO2 in the system of PEG (1)+water (2) increased with decreasing PEG concentration in the mass fraction range of w1=(0.05–0.50). The solubility of SO2 in the system of PEG (1)+water (2) presented an extreme minimum at the mass fraction of w1=0.05 of 270.7gm−3 when SO2 in the gas phase was designated at ySO2=5×10−4. Henry's law constants were fitted with a dynamic system based on the GLE data. Using the solubility data, the partial molar thermodynamic functions of solution, enthalpy and entropy, were calculated. Conclusions drawn from this work may be used to provide important GLE data for the design and operation of the absorption and desorption processes of PEG solutions in flue gas desulfurization.

Solubility of dilute SO2 in 1,4-dioxane, 15-crown-5 ether, polyethylene glycol 200, polyethylene glycol 300, and their binary mixtures at 308.15 K and 122.66 kPa

This work reports the solubility data of dilute sulfur dioxide in 1,4-dioxane, 15-crown-5 ether, polyethylene glycol 200 (PEG 200), polyethylene glycol 300 (PEG 300), and their binary mixtures at 308.15K and 122.66kPa with the SO2 partial pressure ranging between (7.35 and 118Pa). From the solubility data, Henry's law constants of SO2 in pure solvents were calculated. The results show that the solubilities of SO2 in these four solvents increase linearly with the enhancement of the equilibrium partial pressure of SO2 in the gas phase within the studied regions. Furthermore, the absorption of SO2 in pure 1,4-dioxane, 15-crown-5 ether, PEG 200 are typical physical processes, and the solubility of SO2 in the three solvents decreases in the order: 1,4-dioxane>15-crown-5 ether>PEG 200. But the SO2 absorption in PEG 300 is a physical process accompanied by a chemical process.

Solubility of SO2, CO2 in desulfuration solution from 293.15 to 313.15 K

The solubility of dilute SO2, CO2 gas mixture in desulfuration solution has been determined from 293.15 to 313.15 K, along with the partial pressures of SO2 from 0.15 to 3.0 kPa, and of CO2 from 5 to 18 kPa. The measured solubility data are useful in the process design of SO2 removal from flue gas.

Solubility of dilute SO2 in DMSO+Mn2+ mixture solvents and EOS Model-I

Solubility of dilute SO2 mixture gas in dimethyl sulfoxide (DMSO) and MnSO4 mixture solvent has been determined from 294.15 to 313.15 K and partial pressure of SO2 from 0.41 to 2.70 kPa. The measured solubility data can then be used as an essential data to serve the process design of SO2 removal from flue gas.

Solubility of dilute SO2 in DMSO+Mn2+ mixture solvents and EOS model-(II)

On the basis of solubility measurement of dilute SO2 in DMSO + Mn2+ mixture solvents, a new EOS model was established to represent gas–liquid equilibrium system, and the solubilities calculated by the model show good agreement with experimental data.

Solubility of dilute SO2 and CO2 in dimethyl sulfoxide

The solubility of SO2 and CO2 in dimethyl sulfoxide has been determined in the temperature range from 293.15 to 313.15 K and partial pressure of SO2 from 0.15 to 2.62 kPa, and the partial pressure of CO2 from 5 to 18 kPa. A solubility model is proposed and the solubilities calculated by the model show good agreement with the experimental data.

Absorption Equilibria of Dilute SO2 in Seawater

The solubility of dilute SO2 in seawater, from mixtures SO2 + N2, was determined in a temperature range between (278.15 and 318.15) K and a SO2 partial pressure range between (0.050 and 1.5) kPa. Measurements were carried out by a saturation method using a laboratory-stirred batch reactor. Equations to correlate experimental data were obtained as a function of temperature and SO2 partial pressure. Comparisons between experimental results, literature data, and theoretical predictions were also made at different temperatures. Two different models were considered to evaluate the activity coefficients of ionic species. Theoretical calculations were made using both an extended version of the Debye−Hückel theory and the Pitzer ion-interaction model. Both models led to similar predictions and were in good agreement with the experimental results. The reasonable fitting between measured and calculated data showed that the selected models can be successfully used for predicting the absorption equilibria of dilute sulfur dioxide in seawater at different temperatures.

Dilute SO2 Absorption Equilibria in Aqueous HCl and NaCl Solutions at 298.15 K

The solubility of dilute SO2 in aqueous HCl and NaCl solutions was determined at 298.15 K as a function of ionic strength up to 3 mol·L-1, in the partial pressure range between (0.075 and 1.8) kPa. Measurements were carried out by a saturation method using a laboratory batch reactor. Equations to correlate the apparent Henry's law constant, Hm, and the apparent first dissociation constant, Km1, were obtained as a function of ionic strength. Comparisons between experimental results and theoretical predictions were also made. A model based on the classical Sechenov equation was tested, and a new value for the SO2 gas-specific parameter was obtained to calculate Hm. Two different models were considered for calculating the activity coefficients to determine Km1. An extended version of the Debye−Huckel theory described the experimental results for ionic strengths below 0.1 mol·L-1. The Pitzer model was in good agreement with the experimental data in the ionic strength range between (0 and 3) mol·L-1. The close...