Work

Nonaqueous amine-based absorbent for energy-efficient CO2 capture: Effect of shifting solvent on kinetic behaviors

Year: 2025

Type: article

Abstract: Nonaqueous absorbents have shown great potential in lowering regeneration energy for energy-efficient CO 2 capture. The effect of reaction media with varying solvent characteristics (polarity, solubility parameter and dielectric constant) on kinetic behaviors deserves to be discovered. In this work, CO 2 absorption flux against CO 2 partial pressure was determined in a stirred cell reactor at temperatures of 283.2–303.2 K with 1.0–5.0 mol L −1 2-(butylamino)ethanol (BAE) in nonaqueous 2-butoxyethanol (2-BE). Physicochemical properties and the physical mass transfer coefficients were also measured and represented by proposed correlations. The overall reaction rate constants were derived under the well-defined pseudo-first-order regime conditions. The partial reaction order with respect to BAE was found to be about 2.0 in 2-BE and 1.0–1.3 in water respectively, which reveals that the formation of ionic products may be highly depressed in solvent with low Hansen solubility parameter (HSP) resulting in the increasing reaction order. The overall third-order kinetic data can be well represented by termolecular mechanism model with AARD of 10.5 %. The findings will provide fundamental support for further pilot-scale performance demonstration.

Source: Journal of Industrial and Engineering Chemistry

DOI: 10.1016/j.jiec.2025.02.044

Authors: Qinghai Long, Jing Wang, Tiantian Ping, Shufeng Shen

Institution: Hebei University of Science and Technology

Language: English

Topic: Carbon Dioxide Capture Technologies

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

SDGs: Climate action, Affordable and clean energy

Open Access status: hybrid

Estimated APC paid: $2,500