Development and evaluation of a highly efficient carbon dioxide absorption and desorption system using pure liquid amine

2023 Fiscal Year Final Research Report

• Project/Area Number: 22K19876
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 64:Environmental conservation measure and related fields
• Research Institution: Waseda University
• Principal Investigator: Nobuhiro Kanomata 早稲田大学, 理工学術院, 教授 (40221890)
• Project Period (FY): 2022-06-30 – 2024-03-31
• Keywords: 地球温暖化対策 / 二酸化炭素回収 / CCS / ジエチレントリアミン / カルバミン酸 / 純液体吸収液

Outline of Final Research Achievements

This study aimed to develop a highly efficient CO2 capture system using neat liquid diethylenetriamines (DETAs). Seven types of DETAs were synthesized, and their CO2 absorption/desorption performances were measured. The results demonstrated that DETAs had ~1.5 times greater CO2 absorption than the reference diethanolamine (DEA). Moreover, post-absorption CO2 release exceeded 80% efficiency, with the DETA having ethyl groups achieving 100% CO2 release. This indicates the potential for a highly efficient CO2 capture system. DFT calculations and spectral measurements revealed that DETAs form stable complexes with a 2:1 molar ratio for CO2 capture, with carbamic acid as the main product. This study showed the potential for CO2 capture technology using neat liquid amines, representing a significant advance toward carbon capture and storage (CCS) technologies. It also highlighted the importance of molecular design in improving CO2 capture efficiency.

Free Research Field

有機化学

Academic Significance and Societal Importance of the Research Achievements

本研究の成果は、純液体アミンであるジエチレントリアミン誘導体（DETAs）を用いた高効率なCO2回収システムの構築に成功した点にある。DETAsは、既存のジエタノールアミン（DEA）に比べて約1.5倍のCO2吸収性能を示し、吸収後のCO2放散率も80%以上と極めて高い。この結果は、エネルギー消費を抑えながらCO2回収効率を向上させる可能性を示しており、学術的には新たな吸収材の開発と反応機構の解明に貢献する。また、社会的には、持続可能なCO2削減技術の実現に寄与し、地球温暖化対策として重要な役割を果たすことが期待される。