Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Effects of Oxidation Process on Thermal Properties of Petroleum-based Isotropic Pitch

산화 공정이 석유계 등방성 피치의 열거동 특성에 미치는 영향

  • Lee, Namji (Carbon Industry Frontier Research Center, Korea Research Institute of Chemical Technology (KRICT)) ;
  • Seo, Sang Wan (Carbon Industry Frontier Research Center, Korea Research Institute of Chemical Technology (KRICT)) ;
  • Kwak, Cheol Hwan (Carbon Industry Frontier Research Center, Korea Research Institute of Chemical Technology (KRICT)) ;
  • Kim, Min Il (Carbon Industry Frontier Research Center, Korea Research Institute of Chemical Technology (KRICT)) ;
  • Im, Ji Sun (Carbon Industry Frontier Research Center, Korea Research Institute of Chemical Technology (KRICT))
  • 이남지 (한국화학연구원(KRICT) 탄소산업선도연구단) ;
  • 서상완 (한국화학연구원(KRICT) 탄소산업선도연구단) ;
  • 곽철환 (한국화학연구원(KRICT) 탄소산업선도연구단) ;
  • 김민일 (한국화학연구원(KRICT) 탄소산업선도연구단) ;
  • 임지선 (한국화학연구원(KRICT) 탄소산업선도연구단)
  • Received : 2019.12.05
  • Accepted : 2019.12.28
  • Published : 2020.02.10
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Abstract

In order to investigate the effect of the oxidation process on thermal properties of the pitch, the oxidized pitch was prepared by changing the oxidation temperature. Thermal properties of the pitch were analyzed using thermogravimetric analysis (TGA), and it divided into three sections as A (25~100 ℃), B (250~550 ℃) and C (550~800 ℃) by derivative thermogravimetry (DTG) graph behavior. In the A section, the was reduced because the moisture contained in the pitch was removed. In the B section, as the oxidation temperature increased, the thermal stability of the pitch is improved. Because the degree of aromaticity and molecular weight of the pitch increased with increasing oxidation temperature. In contrast, the results of the C section were shown opposite of B section. Because the introduced C-OH, C-O-C, and C=O bonds were decomposed, and the resulting oxygen compounds induced the combustion reaction of the pitch.

산화 공정이 피치의 열거동 특성에 미치는 영향을 규명하기 위하여 다양한 공정 온도에서 산화된 피치를 제조하였다. 피치의 열거동 특성은 thermogravimetric analysis (TGA)를 이용하여 분석하였으며, derivative thermogravimetry (DTG) 그래프 거동 변화에 따라 A (25~100 ℃), B (250~550 ℃), C (550~800 ℃) 세 구간으로 분석하였다. A 구간에서는 피치에 함유되어 있던 수분이 제거되면서 중량 감소가 발생하였다. B 구간에서 산화에 의하여 피치의 열적 안정성이 향상되었다. 이는 산화 온도가 증가할수록 피치의 방향족화도 및 분자량이 증가하였기 때문으로 판단된다. 반면, C 구간에서는 B 구간과 반대의 결과를 보였다. C 구간에서 열적 안정성이 저해된 것은 산화 공정에 의하여 피치에 도입된 C-OH, C-O-C, C=O 결합이 분해되고, 이에 의하여 발생한 산소 화합물이 피치의 연소 반응을 유도하였기 때문으로 사료된다.

Keywords

References

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