Effects of molecular weight and degree of unsaturation on binary diffusion coefficients for lipids in supercritical carbon dioxide
Effects of molecular weight and degree of unsaturation on binary diffusion coefficients for lipids in supercritical carbon dioxide
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DOI：
10.1016/j.fluid.2004.01.017
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发表时间：
2004-05-10
影响因子：
2.6
通讯作者：
Kagei, S
中科院分区：
文献类型：
--
作者：
Funazukuri, T;Kong, CY;Kagei, S
在313.21 K和8-30 MPa条件下，用聚合物包被毛细管柱色谱脉冲响应法测定了油酸家族（油酸、甲酯、乙酯、单、二、甘油三酯）和其他13种由C18-C22不饱和脂肪酸组成的脂类（C18-C22不饱和脂肪酸成分）在313.21 K和11 MPa条件下的无限稀释二元扩散系数和保留系数。各化合物的二元扩散系数和保留系数随压力的增加而减小。二元扩散系数可以用施密特数相关和用温度和CO2粘度表示的经验方程来表示。每种溶质的保留因子可以用CO2密度表示。在313.21 K和11 MPa下，二元扩散系数随溶质分子量的增加而减小，但对于碳数相同的化合物，如甲酯、乙酯和甘油三酯，其扩散系数随C-C双键数的增加而减小。(C) 2004 Elsevier B.V.版权所有
Infinite dilution binary diffusion coefficients and retention factors for the oleic acid family such as oleic acid, methyl- and ethyl esters, and mono-, di, and triglycerides at 313.21 K and 8-30 MPa, and for other 13 lipids consisting of C18-C22 unsaturated fatty acid constituents at 313.21 K and 11 MPa were measured in carbon dioxide by a chromatographic impulse response method with a polymer coated capillary column. The binary diffusion coefficients and the retention factors for each compound decreased with increasing pressure. The binary diffusion coefficients could be represented by a Schmidt number correlation and by an empirical equation written in terms of temperature and CO2 viscosity. The retention factors for each solute could be expressed in terms of CO2 density. While the binary diffusion coefficients at 313.21 K and 11 MPa decreased with solute molecular weight, those for compounds having the same carbon numbers in each group, such as methyl ester, ethyl ester, and triglyceride, decreased with increasing the number of C-C double bonds. (C) 2004 Elsevier B.V. All rights reserved.