1. Chemical Engineering Department; Federal University of Santa Maria; 1000, Roraima Avenue Santa Maria, RS 97105-900 Brazil
2. Laboratory of Agricultural Processes Engineering (LAPE); Federal University of Santa Maria; 1345, Ernesto Barros Street Cachoeira do Sul, RS 96506-322 Brazil
3. Department of Chemical and Food Engineering; Federal University of Santa Catarina; Caixa Postal 476, Florianópolis, SC 88040-900 Brazil