2023 Fiscal Year Final Research Report
Simultaneous organic matter synthesis and absorbent regeneration by hydrothermal treatment of alkali bicarbonate as a CO2 absorbent
| Project/Area Number |
21K04768
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 27020:Chemical reaction and process system engineering-related
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| Research Institution | Shinshu University |
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Principal Investigator |
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | 二酸化炭素回収利用 / 地球温暖化対策 / CO2変換 / 水熱合成 / 反応速度解析 / プロセスシミュレーション / 技術経済性評価 |
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| Outline of Final Research Achievements |
A novel CO2 utilization process integrated with a CO2 absorption process was proposed. In the proposed process, CO2 is recovered from the exhaust gas of a thermal power plant by chemical absorption with K2CO3 aqueous solution as absorbent, and formic acid is synthesized by direct hydrothermal treatment of the CO2-absorbing solution. The effects of reaction temperature, reaction time, concentration and CO2 loading of the absorbent solution on the formic acid yield were experimentally investigated. Based on the experimental data, a reaction kinetic analysis was performed and a reaction model for the hydrothermal synthesis of formic acid was established. Furthermore, a whole system including the CO2 absorption and the hydrothermal synthesis of formic acid were simulated using Aspen plus to evaluate energy consumption and cost, and the feasibility of the proposed process was clarified.
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| Free Research Field |
環境工学、化学工学
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| Academic Significance and Societal Importance of the Research Achievements |
排ガスからCO2を回収し、回収したCO2から燃料や化学物質を生成するCCUプロセスが経済性の高い温暖化対策技術として期待されている。しかし、これまでのCCUプロセスは排ガスから回収したCO2を高純度化し、圧縮・輸送する必要があり、エネルギーとコストがかかる。さらに、CO2と反応させるためのH2の生成にもエネルギーとコストを要するなど課題がある。本研究が提案する、CO2を吸収した吸収液を直接水熱処理しギ酸を合成するプロセスは、CO2の高純度化、圧縮・輸送の必要がなく、また、水を水素源として利用することができるため、消費エネルギーとコストを低減でき、経済性の高い新奇なCCUプロセスとなる。
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