Thermodynamics Study on Bleaching of Soybean Oil Using Attapulgites as Adsorbent

Abstract

Abstract: Adsorption thermodynamics of color particles onto attapulgites were studied through static adsorption experiments under the bleaching condition. The adsorption isotherms in the range of 353 to 383 K were determined. It was calculated that the adsorption enthalpy changes in the range of-0.0434 to-0.0036 kJ/mol,the Gibbs free energy changes in the range of-10.23～11.77 kJ/mol and the entropy changes in the range of-33.34 to 27.78 J/mol·K according to the relationship of the thermodynamic function. The results showed that the adsorption of color particles is an exothermic process. With the increasing of the temperature and quantity of adsorbent,the adsorption increases. The sorption of attapulgites to color particles is an increasing entropy process in this temperature range.

Key words: attapulgites, adsorption, thermodynamics, soybean oil

LIU Yue, LIU Yuan-Fa, WANG Xing-Guo, NIE Zuo-Ming. Thermodynamics Study on Bleaching of Soybean Oil Using Attapulgites as Adsorbent[J]. FOOD SCIENCE, 2008, 29(12): 164-167.

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Thermodynamics Study on Bleaching of Soybean Oil Using Attapulgites as Adsorbent

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