Experimental study of CO2 solubility in high concentration MEA solution for intensified solvent-based carbon capture

Eni Oko,Jian Chen,Meihong Wang,Chin-Hung Cheng,Toluleke E Akinola,Colin Ramshaw,A Elkamel

doi:10.1051/matecconf/201927201004

Eni Oko, Jian Chen + Show 5 more

Open Access

https://doi.org/10.1051/matecconf/201927201004

Copy DOI

Abstract

The solvent-based carbon capture process is the most matured and economical route for decarbonizing the power sector. In this process, aqueous monoethanolamine (MEA) is commonly used as the solvent for CO2 scrubbing from power plant and industrial flue gases. Generally, aqueous MEA with 30 wt% (or less) concentration is considered the benchmark solvent. The CO2 solubility data in aqueous MEA solution, used for modelling of the vapour-liquid equilibria (VLE) of CO2 in MEA solutions, are widely published for 30 wt% (or less) concentration. Aqueous MEA with higher concentrations (from 40 to 100 wt%) is considered in solvent-based carbon capture designs with techniques involving process intensification (PI). PI techniques could improve the process economics and operability of solvent-based carbon capture. Developing PI for application in capture process requires CO2 solubility data for concentrated MEA solutions. These data are however limited in literature. The modelling of the vapour-liquid equilibria (VLE) of CO2 in MEA solutions for PI-based solvent capture techniques involving stronger MEA solution of about 80 wt% concentration requires solubility data at the concentration. In this study, the data for 80 wt% MEA is presented for 40,60, 100 and 120oC. The experimental technique and analytical procedure in this study were validated by comparing the measurements for 30 wt% MEA with data from the literature. The data from this study can be fitted to VLE models such as electrolyte NRTL, extended UNIQUAC etc. which is an important component of solvent-based capture model using MEA as the solvent. More accurate VLE models will improve the prediction accuracy of capture level, rich loading etc. using PI-based solvent-based capture model.

Highlights

Aqueous monoethanolamine (MEA) is an essential industrial solvent for CO2 scrubbing from gas mixtures [1]
Aqueous MEA with higher concentrations are considered in solvent-based carbon capture designs with techniques involving process intensification (PI) such as rotating packed beds [6,7,8,9]
The vapour-liquid equilibria (VLE) data is obtained in the form of equilibrium partial pressure of CO2 ( ) for the vapour phase and CO2 loading for the liquid phase

Summary

Introduction

Aqueous monoethanolamine (MEA) is an essential industrial solvent for CO2 scrubbing from gas mixtures [1]. Aqueous MEA with higher concentrations (up to 100 wt%) are considered in solvent-based carbon capture designs with techniques involving process intensification (PI) such as rotating packed beds [6,7,8,9]. The CO2 solubility data for concentrated MEA solutions (> 30 wt%) are limited in literature: Mason and Dodge [11] and Atadan [12] data covered up to 74 and 59 wt% MEA concentrations respectively. Their measurements did not include regeneration temperature conditions (> 100oC). The aim of this study is to experimentally obtain CO2 solubility data for 80wt% MEA solution at 40, 60, 80, 100 and 120oC to complement existing data for concentrated MEA solution

Objectives

Methods

Results

Conclusion