Articles & Issues
- Conflict of Interest
- In relation to this article, we declare that there is no conflict of interest.
- This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright © KIChE. All rights reserved.
All issues
초임계 이산화탄소에 의한 달맞이꽃씨유의 추출특성
Extraction Characteristics of Evening Primrose Oil with Supercritical Carbon Dioxide
HWAHAK KONGHAK, August 1989, 27(4), 522-530(9), NONE
Download PDF
Abstract
20-50℃, 100-300bar의 초임계 이산화탄소에 대한 달맞이꽃씨유의 용해도를 측정하고 추출수율에 미치는 온도와 압력의 영향 및 물질전달속도를 구하였다. 용해도는 온도를 일정하게 유지하면 압력이 높아짐에 따라 증가하였다. 그러나 용해도에 미치는 온도의 영향은 압력에 따라 다르게 나타남을 알 수 있었다. 100-200bar일 때는 온도가 높아짐에 따라 용해도는 감소하였고 250bar일 때는 거의 일정하다가 300bar에서는 온도가 높아짐에 따라 증가하였다. 추출수율에 미치는 온도와 압력의 영향도 용해도에서의 경향과 일치하였다. 이산화탄소의 유량이 3.5-4.0l/min(STP)일 때, 본 연구의 실험범위에서 최적 추출조건은 50℃, 300bar이며, 이때 추출수율은 약 21wt%였다. 유지기준 추출수율이 약 50%될 때까지 loading량은 거의 일정하였고, 그 후 급격한 감소가 일어났으며, 평균 loading량은 체류시간에 따라 증가하였다. 또한 물질전달 parameter, kca는 이산화탄송의 선속도에 따라 선형적으로 증가하였다.
Solubilities of evening primrose oil(EPO) in supercritical carbon dioxide were measured at tempera-tures of 20-50℃ and pressures of 100 to 300 bars. Solubilities of EPO were found to increase with increasing pressure at constant temperature. When pressure was kept constant, solubilities of EPO decreased with increase in temperature at pressures of 100 to 200 bars, while they increased with higher temperatures at 300 bar. Solubilities at 250 bar were of a constant value. The effects of temperature and pressure on the extraction yield coincided with the tendency in sol-ubility. Under the range covered in this study the highest yield of extraction was 21wt% at the temperature of 50℃ and the pressure of 300bar with the flow rate of carbon dioxide of 3.5-4.0l/min(STP). Loading of oil in supercritical carbon dioxide was constant until the extraction yield based on available oil was less than about 50%, and then it de-careased sharply. The average loadings increased with increase in residence time. Mass transfer parameter, kc, a, increas-ed linearly with the superficial velocity of carbon dioxide in the extractor.