Determination of Binary Diffusion Coefficients of Benzene, Phenol, Naphthalene and Caffeine in Supercritical CO2 between 308 and 933 K in the Pressure Range 90 to 160 gar with Supercritical Fluid Chromatography (SFC)
Determination of Binary Diffusion Coefficients of Benzene, Phenol, Naphthalene and Caffeine in Supercritical CO2 between 308 and 933 K in the Pressure Range 90 to 160 gar with Supercritical Fluid Chromatography (SFC)
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使用超临界流体色谱 (SFC) 测定 90 至 160 gar 压力范围内 308 至 933 K 超临界 CO2 中苯、苯酚、萘和咖啡因的二元扩散系数
DOI：
10.1080/01496398208058150
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发表时间：
1982
影响因子：
2.8
通讯作者：
G. Schneider
中科院分区：
文献类型：
--
作者：
R. Feist;G. Schneider
摘要 使用色谱峰展宽法 (CPB) 测定了 40°C、80 至 160 bar 超临界 CO2 中苯、苯酚、萘和咖啡因的二元扩散系数 D12。观察到的扩散系数约为 10−4 cm2/s，压力从 80 巴升至 160 巴时，扩散系数降低约 50%。对于CO 2 中的萘，在0.6 g/cm 3 的恒定CO 2 密度下在35℃至60℃之间研究温度对D12的影响；发现活化能为 4.7 kJ/mol。随着扩散化合物分子尺寸和极性的增加，观察到吸附效应，这可能导致严重的错误。
Abstract Binary diffusion coefficients D12 have been determined for benzene, phenol, naphthalene and caffeine in supercritical CO2 at 40°C between 80 and 160 bar using the chrpmatographic peak-broadening method (CPB). The observed diffusion coefficients are of the order of 10−4 cm2/s and decrease by about 50% for a pressure rise from 80 to 160 bar. For naphthalene in CO2 the effect of temperature on D12 was investigated between 35 and 60°C at a constant C02 density of 0.6 g/cm3; the energy of activation was found to be 4.7 kJ/mol, With increasing molecular size and polarity of the diffusing compound, adsorption effects are observed which can lead to serious errors.