Adsorção de fenol via carvão ativado tendo como estudo de caso o efluenteda Refinaria Gabriel Passos

• Ano de defesa: 2012
• Autor(a) principal: Elaine Cristina Campos
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Engenharia quimica; Carbono ativado; Adsorção
• Link de acesso: http://hdl.handle.net/1843/BUOS-AUPLXW

The process of adsorption of phenol from the synthetic solution sample and the effluent from the Gabriel Passos Refinery, a company located in the city of Betim/MG, was studied to evaluate the use of activated carbon marketed by the company Carbonmar Comércio e Serviços de Carvão Ativado Ltda produced from the coconut palm bark. The study wasbased on the previous characterization of Activated Carbon (AC) properties, evaluations of factors that influence the adsorption process and the application for column adsorption. The pre-characterization of the CA was based on the determination of BET surface area, by Fourier transform infrared spectroscopy (FTIR) and by determining the acid-basecharacter of the CA surface. For the analysis of the factors that influence the adsorption process, the following variables were considered: (a) changes in the medium of the type of AC mass variation, (b) pH variation between 2.0-13.0, (c) phenol concentration variation from 0 to 1,063 mol/L, (d) variation of the contact time between 0 and 24h, which allowedthe conclusion of a Pseudo 2nd Order model for kinetics, and finally (e) variation of the temperature of the medium from 26 to 50ºC, which allowed the conclusion of a Freundlich type isotherm and thermodynamic parameters (Gº <0), (Hº <0) and (Sº <0), indicating that the adsorption process is spontaneous, exothermic and low degree of freedom. Thedesorption study was performed using hot H2O at 80 ° C (4.63%), NaOH 0.1 M (33.77%), Ethyl Alcohol PA 95% (36.93%) and diluted 70%, (38.49%) and Commercial Ethyl Alcohol 92.8°INPM (44.63%). The column study was performed considering a column prepared by means of a 100 mL buret, 2.5 cm diameter and 20 cm AC height (about 23 gAC), 12 and 17 mL flow rates for the concentrations of phenol of 0.787; 0.910 and 2.031 mol/L, the desorption of these being used Commercial Ethyl Alcohol 92.8°INPM. Finally, the tests with the effluent were done by analyzing the required mass of CA (40g of CA allowed a 90% adsorption), the influence of contact time on kinetics (which also indicated the Pseudo 2nd Order model as best), Desorbent to be used, (best result for NaOH 0.1 mol/L (38.93%), followed by commercial Ethanol Alcohol 92.8°INPM (29.96%). The column study for the effluent was performed considering a bed height of 45 cm, flow rates of 12 and 17 mL/min and desorption from commercial Ethyl Alcohol 92.8ºINPM at 7.0 mL/min, to obtain the representativeness of the facts that occurred with synthetic solution.Keywords: Adsorption, phenol, activated carbon, effluent and column