Project Details Solubility of CO2 in glycols and glycol ethers

Project No.:
2020-025-2-500
Start Date:
01 March 2021
End Date:

Objective

While the capture and sequestering of CO2 is one of the urgent issues confronting Environmental Chemistry and thus, for the development of carbon capture and storage (CCS) technologies, It stands highly relevant also for other industrial applications, like for enhanced oil recovery (EOR) through CO2 injection, for example. Built on top of Selexol (mixture of dimethyl ethers of polyethylene glycols) process success, the low cost, low viscosity, high boiling point, easy availability, and high CO2 solubilities of glymes and glycols have attracted special interest as physical solvents for gas sweetening.

This project will compile and evaluate the solubility of CO2 in glycols and glycol ethers. A thermodynamic consistency test, based on Gibbs-Duhem equation, will allow supporting the data evaluation and the project conclusions. The results of the project will be prepared in the standard format of the IUPAC-NIST Solubility Data Series for publication in the Journal of Physical and Chemical Reference Data and for inclusion in a web-accessible database.

Description

The limited but inconsistent experimental data on high-pressure solubilities of CO2 in glycols and glycol ethers, hinders the development of accurate thermodynamic models able to describe the phase equilibria and thermophysical properties required for the design, optimization, and development of industrial processes. Built on top of the Selexol (mixture of dimethyl ethers of polyethylene glycols) process success and wide industrial implementation, the low cost, low viscosity, high boiling point, easy availability, and high CO2 solubilities of glycols and glycol ethers, like ethylene glycol, diethylene glycol, triethylene glycol, ethylene glycol ethyl ether, diethylene glycol dimethyl ether, just to mention some, have attracted special interest as physical solvents for gas sweetening. However, despite their importance, the CO2 high-pressure phase equilibrium is surprisingly scarce and with important discrepancies among different authors and measuring methodologies. Thus, it stands highly relevant to evaluate the available experimental data of this class of solvents within the Solubility and Equilibrium Data (SSED) of the Analytical Chemistry Division, the IUPAC Solubility Data Project (SDP). Furthermore, the systems under study fit into one of the Solubility Data Project areas, namely the Solubility Related to Industrial Processes. Finally, through task group member Stuart Chalk, we will liaise with the IUPAC Project ‘Development of a metadata schema for critically evaluated solubility measurement data’ on data and metadata capture guidance.

Progress

Page last updated 2 March 2021