Rate of the vegetable oil extraction with supercritical CO2—II. Extraction of grape oil
Rate of the vegetable oil extraction with supercritical CO2—II. Extraction of grape oil
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DOI：
10.1016/0009-2509(94)87013-6
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发表时间：
1994
影响因子：
4.7
通讯作者：
H. Sovová;J. Kučera;J. Jez
中科院分区：
文献类型：
--
作者：
H. Sovová;J. Kučera;J. Jez
用二氧化碳在280 bar和40°C下提取葡萄油。考察了葡萄籽粉碎工艺、溶剂流速和流动方向对提取过程的影响。利用柱塞流模型从萃取曲线计算超临界相和固相的传质系数。当co2下向通过物料床层时，证实了塞流假设，而当co2上向通过物料床层时，由于自然对流的影响，阻滞了co2的萃取。在提取器中研磨的种子数量越少，向上流动越慢，这种效果就越明显。平行塞流模型能够很好地表示上流测得的抽采曲线。
Grape oil was extracted with carbon dioxide at 280 bar and 40°C. Effect of milling of grape seeds, solvent flow rate and flow direction on the course of extraction was investigated. Mass transfer coefficients in the supercritical and solid phases were evaluated from extraction curves using a plug-flow model. While the assumption of plug flow was confirmed in the experiments with downflow of CO2through the bed of milled material, the extraction with upflow of CO2was retarded due to the natural convection. The smaller was the amount of milled seeds in the extractor and the slower was the upward flow, the more pronounced was this effect. A model with parallel plug flows was able to give good representation of the extraction curves measured with upflow.