Thermodynamic modeling of the system of CO2 and potassium taurate solution for simulation of the carbon dioxide capture process

Abstract

Absorption of carbon dioxide from gaseous sources such as flue gases from power plants is accomplished for environmental reasons with the aim to reduce emissions of greenhouse gases. Generally, aqueous solutions of alkanolamines are employed with Monoethanolamine (MEA) considered the benchmark solvent. However, it has drawbacks, primarily its volatility and toxicity, and the need for a lot of energy for regeneration. Recently, new solvents such as amino acid aqueous solutions have started to be considered as alternatives to traditional amines.This paper is focused on the development of a model for the simulation of the absorption and regeneration system using potassium taurate for the capture of carbon dioxide. Detailed modelling of this system is currently limited by the lack of thermodynamic parameters for use in simulations. ASPEN Plus® has been chosen as the framework for developing the model. Species not present by default in the database have been added and appropriate parameters have been determined for obtaining a reliable description of the Vapor–Liquid–Solid Equilibrium by means of the Electrolyte-NRTL method.