Densities, Viscosities and Excess Properties for Dimethyl Sulfoxide with Diethylene Glycol and Methyldiethanolamine at Different Temperatures

Maria Magdalena Budeanu,Vasile Dumitrescu

doi:10.3390/app12010116

Abstract

Densities and viscosities of the binary systems dimethylsulfoxide with diethylene glycol and methyldiethanolamine were measured at temperatures ranging from 293.15 to 313.15 K, at atmospheric pressure and over the entire composition range. The experimental density data was correlated as a function of composition using Belda’s and Herraez’s equations, and as a function of temperature and composition using the models of Emmerling et al. and Gonzalez-Olmos-Iglesias. The viscosity results were fitted to the Grunberg-Nissan, Heric-Brewer, Wilson, Noda, and Ishida and Eyring-NRTL equations. The values of viscosity deviation (Δη), excess molar volume (VE), partial molar volumes (V1¯ and V2¯) and apparent molar volume (Vφ,1 and Vφ,2) were determined. The excess functions of the binary systems were fitted to the polynomial equations. The values of thermodynamic functions of activation of viscous flow were calculated and discussed.

Highlights

The removal of acidic gases or liquids such as carbon dioxide (CO2), sulfur dioxide (SO2), hydrogen sulfide (H2S), carbonyl sulfide (COS) and carbon disulfide (CS2) from natural settings, refineries, synthesis gas streams and petrochemicals are of increasing importance as environmental protection becomes more and more serious [1]
Viscosity values of Dimethyl sulfoxide (DMSO) and diethylene glycol (DEG) reported by Wang et al [9] differ by more than 30% compared with our results
Our results show that for the DEG + DMSO system, the decrease in the DMSO concentration leads to the increase in the values of the apparent molar volumes and partial molar volumes of DEG, and the decrease in the values of the apparent molar volumes and partial molar volumes of DMSO

Summary

Introduction

The removal of acidic gases or liquids such as carbon dioxide (CO2), sulfur dioxide (SO2), hydrogen sulfide (H2S), carbonyl sulfide (COS) and carbon disulfide (CS2) from natural settings, refineries, synthesis gas streams and petrochemicals are of increasing importance as environmental protection becomes more and more serious [1]. It is a significant operation in gas processing to eliminate acid compounds by means of various processes, among which is gas absorption by chemical solutions such as alkanolamines (monoethanolamine, diethanolamine, diisopropanolamine, or methyldiethanolamine) [2]. Binary solution of DMSO with glycols may attract attention due to the possible intermolecular interplay of S=O group in DMSO with –OH group in glycol [7]

Methods

Results

Conclusion