Toward Nonaqueous Alkanolamine-Based Carbon Capture Systems: Developing Parameters for Systems Containing Glymes and Ethylene Glycols in s-SAFT-γ Mie

Abstract

High energy requirements are a key barrier to the wide-scale adoption of alkanolamine-based carbon capture processes. A potential solution to this issue may lie in replacing water, the traditional cosolvent, with an organic alternative. Accordingly, this work presents the continued parametrization of the s-SAFT-γ Mie predictive group-contribution equation of state toward a description of alkanolamine/CO2/organic cosolvent systems. A consistent and systematic methodology is employed in extending s-SAFT-γ Mie to glymes and ethylene glycols and their mixtures with alkanolamines. s-SAFT-γ Mie provides robust qualitative descriptions of ethylene glycols and glymes as well as mono- and diethers. While model predictions are not always quantitative, the ability to obtain qualitatively meaningful results for a wide range of components with a single transferable parameter set underlines s-SAFT-γ Mie’s broad applicability. This highlights s-SAFT-γ Mie’s value in preliminary process design, where rapidly obtainable qualitative property estimates may be preferable to time- and resource-intensive measurements.