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Comprehensive analysis of thermodynamic models for CO2 absorption into a blended N,N-diethylethanolamine-1,6-hexamethyl diamine (DEEA-HMDA) amine |
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| Authors: | Dongfang Zhao Xizi Xiao Shuai Wang Miyi Li Helei Liu |
| Affiliation: | 1. School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, People's Republic of China
Contribution: Conceptualization (lead), Data curation (lead), Formal analysis (equal), ?Investigation (equal), Software (lead), Validation (lead), Writing - original draft (lead), Writing - review & editing (equal);2. School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, People's Republic of China Contribution: Conceptualization (equal), Data curation (equal), Formal analysis (supporting), ?Investigation (equal), Methodology (equal), Writing - review & editing (equal);3. School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, People's Republic of China Contribution: Conceptualization (equal), Data curation (equal), ?Investigation (equal), Methodology (equal), Resources (supporting), Writing - original draft (supporting), Writing - review & editing (equal);4. School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, People's Republic of China Contribution: Formal analysis (supporting), ?Investigation (equal), Methodology (supporting), Supervision (equal), Visualization (supporting), Writing - review & editing (equal);5. School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, People's Republic of China |
| Abstract: | In this work, CO2 equilibrium solubility of 1M N,N-diethylethanolamine (DEEA):2M 1,6-hexamethyl diamine (HMDA), 1.5M DEEA:1.5M HMDA and 2M DEEA:1M HMDA was studied with a temperature range of 298–333 K and CO2 partial pressure range of 8–100 kPa. Seven thermodynamic models including Empirical model, Kent and Eisenberg (KE) model, Hu–Chakma model, Austgen model, Helei Liu model, Liu et al. model, and Li–Shen model were developed by correlating reaction equilibrium constants with observed equilibrium solubility of CO2 in mixed amine solvents. The evaluation of those models was conducted in terms of the average absolute relative deviation (AARD). The results indicated that Liu et al. model considering T, Amine], Ptotal and CO2(aq)] can better represent this complex system with an AARD of 8.06%. Meanwhile, comprehensive comparison and analysis were also performed to identify the contribution of parameters to develop models, which could provide a guideline for the development of accurate thermodynamic models for representation of thermodynamic behaviors. |
| Keywords: | blended amine CO2 equilibrium solubility DEEA-HMDA thermodynamic models |