Study of Extraction Process Utilizing Supercritical Fluid for Chlorinated Aromatic Hydrocarbons

• Main Authors: Yu Te, Chin, 金育德
• Other Authors: Chieh Lin
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/60966121696806149446

碩士 === 國立屏東科技大學 === 環境工程與科學系所 === 95 === In this study, it is demonstrated that the supercritical fluid extraction (SFE) of chlorinated aromatic hydrocarbons is governed by a variety of interrelated parameters, including the amount of standard concentration and volume , pressure, temperature and velocity of fluid . Based on supercritical fluid extraction technology to extract chlorinated aromatic hydrocarbons, a optimum extraction parameters are established and compared with the results of Soxhlet . The result shows that the optimal extraction condition for the present study was the amount of standard concentration and volume of 50 ng/μL × 500 μL , extraction pressure of 250 bar, temperature of 40℃,and fluid flow rate of 2.0 mL/min. In solvent influence experiment, mixing solvent n-Hexane: Dichloromethane ( 1: 1) and Dichloromethane result in a more favorable rate of recovery between 2-5 rings chlorinated aromatic hydrocarbons. Furthermore compared with Soxhlet , SFE has a higher recovery percentage for 2 rings chlorinated aromatic hydrocarbon. Regarding time consuming，SFE for 1-5 rings chlorinated aromatic hydrocarbon, it is faster than Soxhlet. Utilizing SFE for 8270 Phenols Mix, the recovery percentage of chlorinated aromatic hydrocarbon is between 67.55~89.27％, while for TCL Polynuclear Aromatic Hydrocarbons Mix, the recovery percentage of chlorinated aromatic hydrocarbon is between 71~112.8％.When comparing with Taiwan EPA extraction method of NIEA M192.00C, there is no difference in recovery of extraction of two kinds of extraction methods. Based on these results, the SFE is proved to be a better and feasible extraction technology.