Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Characteristics of Carbon Dioxide Separation for Solid Absorbents According to Amine Order

아민 차수에 따른 고체 흡수제의 이산화탄소 분리 특성

  • Hyun Tae Jang (Department of Chemical Engineering, Hanseo University)
  • 장현태 (한서대학교 화학공학과)
  • Received : 2023.07.21
  • Accepted : 2023.10.11
  • Published : 2023.11.01
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Abstract

Primary and secondary amine-based sorbents were synthesized to investigate the operation capacity for the carbon dioxide separation TSA process. (3-Aminopropyl) triethoxysilane was used as a primary amine precursor as a crosslinking agent to synthesize a secondary amine precursor in which amine groups were crosslinked with a crosslinking agent. Carbon dioxide absorbed by primary amines is completely separated above 170 ℃. The working capacity of the primary amine absorbent was less than 2% when regenerated at 130℃. The secondary amine absorbent has a higher carbon dioxide separation capacity at a lower regeneration temperature than the primary amine absorbent. The secondary amine absorbent could predict process operation performance of about 6.5% with 2% carbon dioxide absorption and 100% carbon dioxide regeneration conditions. Therefore, it was found that the working capacity of the secondary amine absorbent was higher than that of the primary amine.

건식 이산화탄소 분리공정에서 아민 구조체의 운전 특성을 규명하기 위하여 1차 아민과 2차 아민 구조체를 합성하였다. TSA 조건에서 1차 아민과 2차 아민 건식 포집 분리제의 분리 특성을 연구하였다. (3-Aminopropyl) triethoxysilane을 1차 아민 전구체로 가교제로 이용하여 가교 결합된 2차 아민 전구체를 합성하였다. 합성된 2차 아민 전구체를 Tetraethyl orthosilicate를 구조배양제로 사용하여 2차 아민 고체상 이산화탄소 분리제를 합성하였다. 1차 및 2차 아민 구조체의 TSA 공정조건에서 이산화탄소 분리 특성을 비교하였다. 1차 아민에 흡수된 이산화탄소 분리는 170 ℃ 이상에서 완전히 이루어지나 이산화탄소에 의하여 아민이 우레아로 전환되며, 아민기 손실이 발생되었다. 아민 손실이 낮은 130 ℃ 재생시 1차 아민 분리제의 공정 운전성능(working capacity)은 본 구조체의 경우 2% 이하로 나타났다. 2차 아민이 낮은 재생온도에서 높은 이산화탄소 분리능을 나타내었다. 이산화탄소 2% 흡수 분위기와 100% 재생분위기에서 약 6.5%의 공정 운전 성능을 예측할 수 있었다.

Keywords

Acknowledgement

이 논문은 2023년도 한서대학교 교내 연구지원사업에 의하여 연구되었음.

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