Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Upgrading of Heavy Oil or Vacuum Residual Oil : Aquathermolysis and Demetallization

중질유 혹은 감압잔사유의 개질 반응 : Aquathermolysis와 Demetallization

  • 이후철 (호서대학교 화학공학과) ;
  • 박승규 (호서대학교 화학공학과)
  • Received : 2016.07.11
  • Accepted : 2016.07.14
  • Published : 2016.08.10
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Abstract

It has been estimated that the Earth has nearly 1.688 trillion barrels of crude oil, which will last 53.3 years at current extraction rates. The organization of petroleum exporting countries (OPEC) group forecasted that the oil prices will not jump to triple-digit territory within a decade, but it can quickly increase as the political issue for reducing oil production appears. With the potential of serious shortage of conventional hydrocarbon resources, the heavy oil, one of unconventional hydrocarbon resources including oil sand and natural bitumen has attracted worldwide interest. The heavy oil contains heavy hydrocarbon compounds, commonly called as resins and asphaltenes, with long carbon chains more than sixty carbon atoms. The high content of heavier fraction corresponds with the high molecular weight, viscosity, and boiling point. Physicochemical properties of residues from vacuum distillation of conventional oil, referred to as vacuum residues (VR) were similar to those of heavy oil. For the development of heavy oil reserves, reducing the heavy oil viscosity is the most important. In this article, commercially employed aquathermolysis processes and their application to VR upgrading are discussed. VR contains transition metals such as Ni and V, but these metals should be eliminated in advance for further refining. Recent studies on demetallization technologies for VR are also reviewed.

지구상에는 1조 6880억 배럴의 원유매장량으로 현재 추세로 채굴하면 향후 53.3년 채굴 가능할 것으로 예측되고 있다. OPEC은 원유값이 10년 내에는 $100이 넘지 않을 것으로 예상하지만, 감산 정책의 정치적 이슈가 등장하면 원유값은 급격히 상승할 수도 있다. 따라서 일반 원유의 고갈에 대비해 비재래형 원유자원인 오일샌드나 비튜맨과 같은 중질유에 대한 관심이 높아지고 있다. 중질유는 일반적으로 레진이나 아스팔텐이라 부르는 탄소수가 60이 넘는 분자량이 높은 화합물 함량이 높아 점도가 높고 끓는점이 높다. 일반 원유를 감압 증류할 때 부생되는 감압잔사유(vacuum residue)는 물리화학적 물성들이 중질유와 비슷하다. 중질유의 채굴을 위해서는 점도를 낮추는 기술이 중요한데 본 리뷰논문은 상업적으로 사용되고 있는 aquathermolysis 기술을 검토하여 보았고 감압잔사유에 적용하여 보았다. 감압잔사유에는 니켈(Ni)과 바나듐(V)과 같은 전이금속이 함유되어 있는데, 이를 고도화하기 위해서는 전이금속 제거가 선행되어야 한다. 본 리뷰 논문에서는 감압잔사유로부터의 전이금속 제거 기술에 대한 최근 연구결과를 정리하여 보았다.

Keywords

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