Artículos de revistas
Adsorption of Aromatics from Base Oil over Polymeric Resins. Equilibrium and kinetics.
Fecha
2015-01Registro en:
Busto, Mariana; Sepulveda Flores, Jorge Humberto; Carrara, Nicolás Ricardo; Vera, Carlos Roman; Adsorption of Aromatics from Base Oil over Polymeric Resins. Equilibrium and kinetics.; American Chemical Society; Energy & Fuels (print); 29; 2; 1-2015; 1249-1256
0887-0624
CONICET Digital
CONICET
Autor
Busto, Mariana
Sepulveda Flores, Jorge Humberto
Carrara, Nicolás Ricardo
Vera, Carlos Roman
Resumen
Adsorption of aromatic molecules from base oil over an acid resin (Amberlyst 15w) was studied, with a focus on reducing the aromatic content to that of a white mineral oil. It was found that the adsorption capacity of the resin was low. At saturation in the best condition the adsorption capacity corresponded to 10% de acid capacity. The effects of dilution, temperature and adsorption time were studied.In the absence of a diluting solvent the isotherm was unfavorable and the adsorption rate was low with a pseudo first order constant of about 0.1 h-1. Dilution of the oil with n-hexane had beneficial effects on the adsorption capacity, the adsorption rate and the yield of refined oil. The 1:1 (vol:vol) dilution was found to be optimal. Kinetic data were better explained by a model of dominant intraparticle diffusion, the adsorbate load being proportional to the square of the adsorption time. Dilution with n-hexane was thought to decrease the viscosity with a proportional increase of the diffusivity, and a decrease of the chemical affinity of the oil matrix.Estimations of the oil purity and refined oil yield after a series of equilibrium stages indicated that 3 stages with an adsorbent-to-oil ratio of 0.5 (g g-1) and a 1:1 dilution in nhexane could refine the studied base oil (initial aromatics content 0.136 mmol g-1) to a white mineral oil of food grade, with a yield of about 60%. Removal of the solvent was considered easy given the high volatility of n-hexane as compared to the oil.