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| 碱性白土吸附大豆油中油酸的动力学研究 |
| Kinetics of adsorption of oleic acid from soybean oil by alkaline clay |
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| DOI： |
| 中文关键词: 碱性白土 吸附 油酸 大豆油 动力学 |
| 英文关键词:alkaline clay adsorption oleic acid soybean oil kinetics |
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| 中文摘要: |
| 研究不同碱性白土的含水量、吸附温度及大豆油中初始油酸含量条件下，碱性白土吸附大豆油中油酸的动力学。结果表明：吸附过程符合拟二级动力学方程，相关系数R2>0.995，由模型拟合得出的平衡吸附量与实验值接近；碱性白土含水量增加，吸附速率明显加快；吸附速率常数不随大豆油中油酸含量升高而变化，表现为化学吸附控制；而吸附速率常数随着吸附温度的升高而增大，平衡吸附量则随吸附温度升高而减少，说明此吸附为放热过程，表现为物理吸附控制。吸附活化能为70.7 kJ/mol，该活化能介于物理吸附和化学吸附之间，故碱性白土对大豆油中油酸的吸附是化学吸附和物理吸附共同控制的。 |
| 英文摘要: |
| The kinetics of adsorption of oleic acid from soybean oil by alkaline clay under the conditions of different water contents of alkaline clay，different adsorption temperatures and different initial contents of oleic acid of soybean oil was studied.The results showed that the adsorption process was in line with the quasi-second order kinetic equation with correlation coefficient R2 above 0.995 and the theoretical equilibrium adsorption capacity was close to the experimental value；the adsorption rate increased obviously with the water content of alkaline clay increasing；the adsorption rate constant hardly changed with the content of oleic acid of soybean oil increasing，which manifested chemical adsorption control；the adsorption rate constant increased while the balance adsorption capacity decreased with the adsorption temperature rising，which indicated that the adsorption was an exothermic process and manifested physical adsorption control. The activation energy of the adsorption was 70.7 kJ/mol，which was between physical adsorption and chemical adsorption. Therefore，the adsorption of oleic acid from soybean oil by alkaline clay was controlled by both chemical adsorption and physical adsorption. |
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