Fractionation of Aromatic Heavy Oil by Dynamic Supercritical Fluid Extraction

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• 作者：So-Jin Park ; Cheol-Joong Kim ; and Bo-Sung Rhee
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2000
• 出版时间：December 2000
• 年：2000
• 卷：39
• 期：12
• 页码：4897 - 4900
• 全文大小：40K
• 年卷期：v.39,no.12(December 2000)
• ISSN：1520-5045

文摘

A new separation process should be applied to improve the quality of pitch that will be used forthe production of high-performance carbon materials. In this study, aromatic heavy oil has beenfractionated with supercritical n-hexane. Dynamic supercritical fluid extraction was applied,and the dependence on the temperature and pressure of the extraction behavior and selectivityhas been investigated. Aromatic heavy oil was fractionated into several fractions, which have aboiling point distribution that is clearly different from that of the feedstock, by extraction undervapor-liquid-like phase behavior conditions. The boiling point distribution of the extractssampled under liquid-liquid-like phase behavior conditions, however, was almost the same asthat of the aromatic heavy oil. As the extraction temperature increased, the extraction rate alsoincreased without a compensation for the extraction selectivity of the boiling point distribution.The increasing of extraction pressure, however, decreased the extraction selectivity of the boilingpoint distribution although extraction rate was increased. Asphaltene was rejected by extractionunder vapor-liquid-like phase behavior conditions, but there was no chemical compositionextraction selectivity under liquid-liquid-like phase behavior conditions.