Modelagem da extração supercritica de oleos essenciais

AUTOR(ES)

Lucio Cardozo Filho

DATA DE PUBLICAÇÃO

1999

RESUMO

This work presents complementary and auxiliary methodologies for modeling supercritical extraction of essential oils. The first methodology consists of a mathematical procedure to obtain the fugacity coefficients, from any equation of state. These coefficients are necessary for thermodynamic modeling of the supercritical extraction. This procedure allows to use any type of mixing rule for determination of the interaction parameters of the equation of state. The second methodology deals with the procedure to calculate the vapour-liquid equilibrium at high pressures. The vapour-liquid equilibrium is calculated from a system of equations involving the mass balance, thermodynamic equilibria relationship and stoichiometric restrictions. This procedure allows to calculate the basic problems of liquid-vapour equilibrium, such as: bubble point, dew point and flash. The solubility of an essential oil in carbon dioxide was predicted using this procedure. The third methodology was developed in order estimate binary interaction parameters of the thermodynamic equations state from literature liquid-vapour equilibrium Maximum Likelihood experimental data. The Generalized method was used together with the methodology to calculate binary interaction parameters for the liquid-vapour equilibrium at high pressures. The fourth methodology allows the study of the kinetics of supercritical extraction based on a fixed bed model with the diffusion in homogeneous solid. The adopted model can be used for the systems which are: isotherm, one dimensional, without axial dispersion and have a linear sorption isotherm. Finally, a procedure was developed for a fast economic evaluation of industrial plants of supercritical extraction of natural products. This economic evaluation takes into account the energy cost. The example selected for the application of the developed methodologies was the desterpenation of orange essential oil, which is a oil of great industrial interest. Peng-Robinson and Soave-Redlich-Kwong were the used equations of state.

ASSUNTO(S)

equilibrio liquido-vapor equações de estado dioxido de carbono massa - transferencia essenciis e oleos essenciais

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