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Title: Concentration Dependent Speciation and Mass Transport Properties of Switchable Polarity Solvents

Abstract

Tertiary amine switchable polarity solvents (SPS) consisting of predominantly water, tertiary amine, and tertiary ammonium and bicarbonate ions were produced at various concentrations for three different amines: N,N-dimethylcyclohexylamine, N,N-dimethyloctylamine, and 1 cyclohexylpiperidine. For all concentrations, physical properties were measured including viscosity, molecular diffusion coefficients, freezing point depression, and density. Based on these measurements a variation on the Mark Houwink equation was developed to predict the viscosity of any tertiary amine SPS as a function of concentration using the amine’s molecular mass. The observed physical properties allowed the identification of solution state speciation of non-osmotic SPS, where the amine to carbonic acid ratio is significantly greater than one. These results indicate that at most concentrations the stoichiometric excess amine is involved in solvating a proton with two amines. The physical properties of osmotic SPS have consistent concentration dependence behavior over a wide range of concentrations; this consistence suggests osmotic pressures based on low concentrations freezing point studies can be reliably extrapolated to higher concentrations.

Authors:
;
Publication Date:
Research Org.:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1177611
Report Number(s):
INL/JOU-14-32773
Journal ID: ISSN 2046--2069
DOE Contract Number:  
DE-AC07-05ID14517
Resource Type:
Journal Article
Journal Name:
RSC Advances
Additional Journal Information:
Journal Volume: 5; Journal Issue: 10; Journal ID: ISSN 2046--2069
Country of Publication:
United States
Language:
English
Subject:
03 NATURAL GAS; 04 OIL SHALES AND TAR SANDS; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; Switchable Polarity Solvent; Water Treatment

Citation Formats

Wilson, Aaron D., and Orme, Christopher J. Concentration Dependent Speciation and Mass Transport Properties of Switchable Polarity Solvents. United States: N. p., 2014. Web. doi:10.1039/C4RA08558B.
Wilson, Aaron D., & Orme, Christopher J. Concentration Dependent Speciation and Mass Transport Properties of Switchable Polarity Solvents. United States. https://doi.org/10.1039/C4RA08558B
Wilson, Aaron D., and Orme, Christopher J. 2014. "Concentration Dependent Speciation and Mass Transport Properties of Switchable Polarity Solvents". United States. https://doi.org/10.1039/C4RA08558B.
@article{osti_1177611,
title = {Concentration Dependent Speciation and Mass Transport Properties of Switchable Polarity Solvents},
author = {Wilson, Aaron D. and Orme, Christopher J.},
abstractNote = {Tertiary amine switchable polarity solvents (SPS) consisting of predominantly water, tertiary amine, and tertiary ammonium and bicarbonate ions were produced at various concentrations for three different amines: N,N-dimethylcyclohexylamine, N,N-dimethyloctylamine, and 1 cyclohexylpiperidine. For all concentrations, physical properties were measured including viscosity, molecular diffusion coefficients, freezing point depression, and density. Based on these measurements a variation on the Mark Houwink equation was developed to predict the viscosity of any tertiary amine SPS as a function of concentration using the amine’s molecular mass. The observed physical properties allowed the identification of solution state speciation of non-osmotic SPS, where the amine to carbonic acid ratio is significantly greater than one. These results indicate that at most concentrations the stoichiometric excess amine is involved in solvating a proton with two amines. The physical properties of osmotic SPS have consistent concentration dependence behavior over a wide range of concentrations; this consistence suggests osmotic pressures based on low concentrations freezing point studies can be reliably extrapolated to higher concentrations.},
doi = {10.1039/C4RA08558B},
url = {https://www.osti.gov/biblio/1177611}, journal = {RSC Advances},
issn = {2046--2069},
number = 10,
volume = 5,
place = {United States},
year = {Mon Dec 01 00:00:00 EST 2014},
month = {Mon Dec 01 00:00:00 EST 2014}
}