Evaluation of the sugar inversion in an evaporation system (faling film evaporator with promotor of film). / Avaliação da inversão da sacarose em um sistema de evaporação (evaporador de filme descendente com promotor de película).

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

In this work the evaluation of sucrose inversion in a system formed by falling film Evaporator with Promoter of film is presented. The modeling was made considering: mass and enthalpy balances and the kinetic of inversion in the evaporation tube. The mean parameters investigated were: kinetic constant (k), evaporation rate (mv), concentration of total sugars (C), volumetric velocity of the liquid in the evaporation tube (q), pH, temperature (T) and residence time in the evaporation tube (T). Two methods was used to solve the model, the first by numeric integration (Runge Kutta 4th Order) and the other by analytic integration of simplified model considering mean values of properties and pH, and the kinetic constant calculates at effective temperatures in each zone of the evaporation tube, Tefa and Tefe, allowed the analytic integration of the model. The volume of liquid in the evaporation tube (V) was calculated by the two methods (numeric integration and simplified methods). The results were expressed as a function of liquid flow rate (q). It was verified that the values obtained by the two methods were very closed. These models can be used for the optimization of the evaporation process emphasizing the minimization of the sucrose inversion. The methodology could be used for the determination of the residence time in the evaporation tube.

ASSUNTO(S)

evaporação inversão de sacarose evaporadores inversion of sucrose kinetic inverted sugar falling film evaporator residence time evaporation system

ACESSO AO ARTIGO

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