Mathematical models for supercritical extraction of oregano ''Origanum virens L''

被引：5

作者：

Esquivel, MM

deSousa, CL

Ribeiro, MA

BernardoGil, MG

机构：

[1] Dep. Engenharia Química, IST, 1096 Lisboa Codex, Av. Rovisco Pais

来源：

HIGH PRESSURE CHEMICAL ENGINEERING | 1996年 / 12卷

关键词：

Origanum virens L; supercritical extraction; fixed bed; mass transfer;

D O I：

10.1016/S0921-8610(96)80091-4

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The extraction of essential oil from oregano-Origanum virens L.- using liquid carbon dioxide (7 MPa and 298 K) and supercritical carbon dioxide (10 and 15 MPa and 313 K) was investigated. Experimental results were obtained in a laboratory scale plant equipped with a 100 mL tubular extractor. During the extraction an unsteady process prevails. The present paper presents an unsteady state mathematical model for a fixed bed extractor (model I). The overall mass transfer coefficients were calculated by matching the calculated and experimental values of oil loading in CO2. The results are compared with those obtained by the model developed by Catchpole et al, 1994 (model II). Good agreement between both models results and our experimental measurements were obtained, although the model II allows the best fit over the entire extraction curve.

引用

页码：525 / 530

页数：6

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