Adsorção de o-xileno em argila fluidgel organofílica em fase gasosa / Adsorption of o-xylene onto organoclay fluidgel in gas phase

AUTOR(ES)

Diana Carolina Rueda Martin

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

10/07/2012

RESUMO

The industrial growth allied to use of petroleum products generate numerous volatile organic compounds (VOC) that are continuously emitted to the atmosphere, degrading air quality and causing serious problems to human health and environment. Among the VOC, the so-called BTEX (benzene, toluene, ethyl benzene, and xylene), are the most important in terms of toxicity and contribution to secondary with tropospheric ozone pollution. BTEX compounds are present as raw materials or inputs in several industrial processes. One of the most commonly techniques employed for removing gaseous pollutants is adsorption because of its simplicity and high efficiency. The choice of adsorbent is fundamental to the applicability of this process in large scale. This work used a Brazilian commercial sodium bentonite clay called "Fluidgel" for the removal of o-xylene gas effluent which was characterized from a physical and mineralogical organophilic-in nature study, evaluating their adsorptive properties and qualitative process organophilization, morphology and chemical composition in order to increase its affinity for volatile organic compounds. The organophillization was performed using a quaternary salt of hexadecyltrimethylammonium bromide (HDTMA-Br). The dynamic experimental system consisted of a porous bed adsorption, a saturator for the contaminant and a continuous HC analyzer working with flame ionization detector (FID). The breakthrough curves were obtained at three different temperatures, so the effect of temperature on adsorption in bentonites organoclays was investigated. The adsorption isotherms of compound were fitted by equilibrium models (Langmuir and Freundlich). The parameters of efficiency such as useful and total amount removed, length of the mass transfer Zone (ZTM) and total removal percentage were determined. A thermodynamic study revealed that the adsorption process is exothermic and spontaneous.

ASSUNTO(S)

adsorção argila ar - poluição adsorption clay atmospheric pollution

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