Process analysis and economic evaluation of mixed aqueous ionic liquid and monoethanolamine (MEA) solvent for CO₂ capture from a coke oven plant

Abstract

This study investigates the process and economic impacts of using an aqueous mixture of 1‐butylpyridinium tetrafluoroborate ([Bpy][BF4]) ionic liquid (IL) and monoethanolamine (MEA) as the solvent for CO2 capture from a coke‐oven plant. The gaps highlighted in the literature on the study of an aqueous mixture of IL and MEA for CO2 capture include lack of detailed process models or information on the impacts of varying the IL concentration on different process conditions and economics. This study addressed these needs by developing a rate‐based, solvent‐based CO2 capture process model with a mixed IL and MEA solvent and using the model to perform process and economic evaluations. The model was developed with Aspen Plus® and was used to investigate seven different aqueous mixtures of IL and MEA. The MEA concentration was 30 wt% for all the seven aqueous solvent mixtures, and the corresponding IL concentration was 0, 5, 10, 15, 20, 25 and 30 wt% for each combination. The hybrid IL solvent mixtures (i.e. 5–30 wt% IL) have 7–9% and 12–27% less regeneration energy and solvent circulation rate respectively compared to the base case (i.e. 30 wt% MEA). Based on a commercial‐scale cost benchmark for the IL, the initial solvent cost for the mixed solution is predictably higher. However, the solvent makeup cost is less for the mixed solvent. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd.

Ionic Liquids/Deep Eutectic Solvents-Based Hybrid Solvents for CO2 Capture

“…At present, the absorption technology with 30 wt % MEA aqueous solution is the commercialized one. However, this technology with the corresponding solvent has the drawbacks of high energy demand (4.2 GJ/t CO 2 ), high cost ($0.19-1.31/t CO 2 ), low thermal and chemical stability, and high volatility and corrosion [3][4][5][6], which underlines the necessity for developing greener and more efficient solvent for CO 2 capture.…”

Solvents for Membrane-Based Post-Combustion CO2 Capture for Potential Application in the Marine Environment

“…A number of process simulation studies exist for assessing the performance of ILs and evaluating the cost of the overall CO 2 capture process as well as operating parameters such as the regeneration demands. Oko et al [99] compared a mixed aqueous solution of MEA and six different ILs, concluding that ILs based on the 2-cyanopyrrole anion showed the lowest circulation rate and lowest regeneration energy requirements. This energy was estimated at 3.6 GJ/t CO 2 by Zhai and Rubin [100].…”

Integration of hydrothermal liquefaction and carbon capture and storage for the production of advanced liquid biofuels with negative CO2 emissions

“…Regarding the solvent price, it was not possible to find reliable standard market prices as the solvent is not traded as a commodity. However, the price used is comparable to the reported for other solvents such as MEA [26]. The solvent cost is added to the capital cost, as it is not estimated in Hysys, and it is assumed that replacement of solvent is not necessary in the project lifetime, as it has been reported that DEPG is a stable solvent and is very resistant to degradation, even with oxygen [27] [28].…”