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임계온도 영역의 헥산에 의한 방향족 중질오일의 추출 특성
Extraction Characteristics of Aromatic Heavy Oil with Near-critical n-Hexane
SK주식회사 대덕기술원, 대전 305-370 1충남대학교 공과대학 화학공학과, 대전 305-764
Daeduk Institute of Technology, SK corporation, Taejon 305-370, Korea 1Dept. of Chem. Eng., Chungnam National University, Taejon 305-764, Korea
sjpark@cnu.ac.kr
HWAHAK KONGHAK, December 2000, 38(6), 804-808(5), NONE
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Abstract
본 연구에서는 임계점 부근 조건의 n-hexane을 사용한 방향족 중질오일의 분리 정제 방법에 대해 검토하였으며, 온도 및 압력 변화가 추출 거동 및 추출 선택성에 미치는 영향에 대해 고찰하였다. 대상계가 기-액 거동을 보이는 조건에서 추출 유분의 비점 분포는 방향족 중질오일의 비점 분포와 명확한 차이를 보였다. 온도 증가는 비점 분포 선택성을 유지하면서 단위 용매당 추출량을 증가시키는데 효과적이었으나, 압력 증가는 단위 용매당 추출량을 향상시키는 반면 비점 분포 선택성을 크게 저하시켰다. 운전조건 변화는 화학조성 선택성에 영향을 주지 않았다.
In this study, Aromatic Heavy Oil has been extracted with near-critical n-hexane, and the dependence of temperature and pressure to extraction behavior and selectivity has been investigated. Boiling point distribution of extracts, extracted at vapor-liquid behavior conditions, was significantly different from that of Aromatic Heavy Oil. As increasing of extraction temperature, extraction quantity at unit solvent quantity was increased without the compensation for extraction selectivity of boiling point distribution. The increasing of extraction pressure, however, decreased the extraction selectivity of boiling point distribution though extraction quantity at unit solvent quantity was increased. The change of extraction conditions could not affect the selectivity of chemical compositions.
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