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Aplicación del diseño D-Optimal en la modelación de la adsorción de COVs-Cl sobre zeolitas naturales chilenas modificadas/ Application of D-optimal design for modelling the adsorption of Cl-VOCs onto modified natural zeolites

Riquelme, Andrés L ; Valdés, Héctor

Ingeniare : Revista Chilena de Ingenieria, 2016-10, Vol.24 (4), p.542 [Periódico revisado por pares]

Arica: Universidad de Tarapacá

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  • Título:
    Aplicación del diseño D-Optimal en la modelación de la adsorción de COVs-Cl sobre zeolitas naturales chilenas modificadas/ Application of D-optimal design for modelling the adsorption of Cl-VOCs onto modified natural zeolites
  • Autor: Riquelme, Andrés L ; Valdés, Héctor
  • Assuntos: Adsorption ; Chromatography ; Design optimization ; Zeolites
  • É parte de: Ingeniare : Revista Chilena de Ingenieria, 2016-10, Vol.24 (4), p.542
  • Descrição: In this work, design variables and operating conditions in the adsorption of chlorinated volatile organic compounds (Cl-VOCs) using transition metal-modified natural zeolites (ZMt) are investigated. The levels of design variables are established: out-gassing temperature [350 °C, 550 °C], type of transition metal [Fe, Mn, Ag, Co, Cu, Ni], concentration of transition metal [0.05; 0.1 M], metal deposition method [impregnation, ion exchange], post-treatment of the deposited metal [calcination under O2 flow, reduction under H2flow], whereas among operating parameters, the type of VOC-Cl [perchlorethylene, chlorobenzene], concentration of Cl-VOCs [1.5; 9.5gmole dm-3], adsorption temperature [20; 100 °C], volumetric flow of Cl-VOCs [50; 100 cm3 min-1], mass of ZMt [0.15; 0.3 g] are chosen. D-Optimal design of experiment is used, and the number of experiments are reduced from 2.048 to 139. Adsorption experiments were carried out in a quartz U-shaped fixed bed adsorber, and the concentration of Cl-VOC was followed by gas chromatography. Experimental results are fitted to a second-order polynomial model. The analysis of variance (ANOVA) shows that the adjusted model is highly significant, with a satisfactory goodness of fit. ANOVA results also indicate that among the significant variables, modified zeolite samples by ion exchange using Fe or Cu increase the adsorption capacity toward Cl-VOC. The concentration of Cl-VOCs and the adsorption temperature show the biggest influence on the removal of Cl-VOCs, among all the studied operating variables.
  • Editor: Arica: Universidad de Tarapacá
  • Idioma: Espanhol
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