Adsorption of ethyl acetate onto modified clays and its regeneration with supercritical CO2

Brazilian Journal of Chemical Engineering

A. M. Cavalcante¹  L. G. Torres¹  G. L. V. Coelho¹ 

[1] ,Universidade Federal Rural do Rio de Janeiro Department of Chemical Engineering Laboratory of Separation ProcessSeropédica RJ ,Brazil

关键词: Ethyl acetate adsorption;    Regeneration of modified clays;    Supercritical CO2;   

DOI  :  10.1590/S0104-66322005000100008

来源: SciELO

【 摘 要 】

Modified clays were used to remove ethyl acetate from aqueous solutions. These clays were regenerated using supercritical CO2. Structural changes in the montmorillonite clay after treatment with quaternary amines were studied. The surface properties of the modified clay changed from highly hydrophilic to highly organophilic. The clay was regenerated by percolation of a stream of CO2 through the porous montmorillonite matrix. Different pressures and temperatures were employed, resulting in different fluid conditions (gas, liquid, and supercritical). The experimental data was fitted with a simplified model. The best desorption result was found under supercritical conditions. A crossover effect was observed. The capacity of the modified clay as a pollutant attenuator remained almost unchanged after a regeneration cycle.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License