Experiment on a new biphasic absorber composed of TEPA/DEEA for capturing CO2 and its phase transition mechanism

doi:10.1016/j.cjche.2024.11.027

Chinese Journal of Chemical Engineering ›› 2025, Vol. 81 ›› Issue (5): 64-75.DOI: 10.1016/j.cjche.2024.11.027

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Experiment on a new biphasic absorber composed of TEPA/DEEA for capturing CO₂ and its phase transition mechanism

Fulong Zhang^1,2, Wenbo Gu^1,2, Jiawei Zhang^1,2, Zipeng Zheng^1,2

1. School of Electrical Engineering, Xinjiang University, Urumqi 830017, China;
2. Engineering Research Center of Northwest Energy Carbon Neutrality, Ministry of Education (ERCNECN), Xinjiang University, Urumqi 830017, China

Received:2024-08-25 Revised:2024-11-01 Accepted:2024-11-27 Online:2025-03-14 Published:2025-05-28
Contact: Wenbo Gu,E-mail:bobo1314@sjtu.edu.cn
Supported by:
The authors would appreciate the financial support provided by Special Fund Project for Central Guidance of Local Scientific and Technological Development through the Grant ZYYD2022C16, Major Science and Technology Projects of Xinjiang Uygur Autonomous Region through the Grant 2023A01005-2, and Natural Science Foundation of Xinjiang Uygur Autonomous Region through the Grant 2022D01C87.

Experiment on a new biphasic absorber composed of TEPA/DEEA for capturing CO₂ and its phase transition mechanism

Fulong Zhang^1,2, Wenbo Gu^1,2, Jiawei Zhang^1,2, Zipeng Zheng^1,2

1. School of Electrical Engineering, Xinjiang University, Urumqi 830017, China;
2. Engineering Research Center of Northwest Energy Carbon Neutrality, Ministry of Education (ERCNECN), Xinjiang University, Urumqi 830017, China

通讯作者: Wenbo Gu,E-mail:bobo1314@sjtu.edu.cn
基金资助:
The authors would appreciate the financial support provided by Special Fund Project for Central Guidance of Local Scientific and Technological Development through the Grant ZYYD2022C16, Major Science and Technology Projects of Xinjiang Uygur Autonomous Region through the Grant 2023A01005-2, and Natural Science Foundation of Xinjiang Uygur Autonomous Region through the Grant 2022D01C87.

Abstract

Abstract: With the development of chemical absorbers, biphasic absorbers have the potential for absorption performance and energy consumption. In this work, a new biphasic absorber composed of tetraethylene pentamine (TEPA) and Diethyl ethanolamine (DEEA) is formed to capture CO_2. The appropriate stratification boundaries by experimentation are found for orthogonal experiment. The optimum capture CO₂ conditions are obtained according to the orthogonal design. The ranking of factors affecting the ability and rate to absorb CO₂ is C (waste flow rate) > A (mass ratio) > B (reaction temperature). The desorption efficiency of the new biphasic absorber reaches 96.66% at 140 °C. The new biphasic absorber has good recyclability and its energy consumption is 2.23 GJ·t^-1 CO_2. Through viscosity experiment, reaction products analyzed by ¹³C NMR date, functional groups and chemical bonds analyzed by FT-IR date analysis, the mechanisms of CO₂ absorption and phase transition follow a zwitterionic mechanism. This is a biphasic amine that deserves in-depth study.

Key words: CO₂ absorption, Biphasic system, Tetraethylene pentaamine

摘要： With the development of chemical absorbers, biphasic absorbers have the potential for absorption performance and energy consumption. In this work, a new biphasic absorber composed of tetraethylene pentamine (TEPA) and Diethyl ethanolamine (DEEA) is formed to capture CO_2. The appropriate stratification boundaries by experimentation are found for orthogonal experiment. The optimum capture CO₂ conditions are obtained according to the orthogonal design. The ranking of factors affecting the ability and rate to absorb CO₂ is C (waste flow rate) > A (mass ratio) > B (reaction temperature). The desorption efficiency of the new biphasic absorber reaches 96.66% at 140 °C. The new biphasic absorber has good recyclability and its energy consumption is 2.23 GJ·t^-1 CO_2. Through viscosity experiment, reaction products analyzed by ¹³C NMR date, functional groups and chemical bonds analyzed by FT-IR date analysis, the mechanisms of CO₂ absorption and phase transition follow a zwitterionic mechanism. This is a biphasic amine that deserves in-depth study.

关键词: CO₂ absorption, Biphasic system, Tetraethylene pentaamine

Fulong Zhang, Wenbo Gu, Jiawei Zhang, Zipeng Zheng. Experiment on a new biphasic absorber composed of TEPA/DEEA for capturing CO₂ and its phase transition mechanism[J]. Chinese Journal of Chemical Engineering, 2025, 81(5): 64-75.

Fulong Zhang, Wenbo Gu, Jiawei Zhang, Zipeng Zheng. Experiment on a new biphasic absorber composed of TEPA/DEEA for capturing CO₂ and its phase transition mechanism[J]. 中国化学工程学报, 2025, 81(5): 64-75.

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Experiment on a new biphasic absorber composed of TEPA/DEEA for capturing CO₂ and its phase transition mechanism

Experiment on a new biphasic absorber composed of TEPA/DEEA for capturing CO₂ and its phase transition mechanism

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