PEREZ Ethel Erminia
Desolventizing kinetics of oilseed meals with superheated hexane
FANER, SANDRO A.; PEREZ, ETHEL E.; CRAPISTE, GUILLERMO H.
JOURNAL OF FOOD PROCESS ENGINEERING
WILEY-BLACKWELL PUBLISHING, INC
Año: 2019 vol. 42
The desolventization kinetics of oilseed meals with superheated solvent was investigated experimentally and theoretically. A bench-scale equipment was designed and built to measure continuously the rate of mass loss and the solid temperature during desolventization of meal particles. Experiments were carried out with sunflower and soy meals using superheated hexane vapor as desolventizing fluid and temperatures ranging from 90 °C to 135 °C. Experimental data were used to determine the vapor-particle heat transfer coefficient under different conditions, which compare reasonably with predictions of dimensionless correlations for solid particles. A relatively simple mathematical model to represent the desolventization kinetics of individual meal particles, based on heat transfer in a receding front system, was developed. The model was used to analyze the effect of temperature, particle diameter, shrinkage and mass transfer on desolventizing rate. Prediction of desolventization kinetics of sunflower and soy meals compared satisfactorily against experimental results at different temperatures. Practical applications: This work expands the knowledge of technical information on the desolventization of sunflower and soybean meal particles with superheated hexane and provides a suitable model to represent the desolventizing kinetics under different conditions. This information can be applied to simulate, design and optimize the desolventizing process of oilseed meals with superheated solvent in fixed and fluidized beds.