2018-04-032018-04-031998-12-18FARIA, Lênio José Guerreiro de. Análise experimental do processo de secagem de urucum (Bixa orellana L.) em leito fixo. 1998. 274 f. Tese (Doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Quimica, Campinas, 1998. Programa de Pós-Graduação em Engenharia Química. Disponível em: <http://repositorio.ufpa.br/jspui/handle/2011/9678>. Acesso em:.https://repositorio.ufpa.br/handle/2011/9678The drying of annatto seeds (Bixa orellana L.), type Red Piave, was studied in a fixed bed dryer. The optimal conditions were obtained to minimize the bixin losses and to obtain the final moisture content of seeds in the adequate lovels for conservation and quality maintenance. The bixix and the final moisture contents were studied as a function of the operational variables of the drying process. The termodynamic behavior of the seeds during the process of moisture desorption was verified by the static gravimetric method, using saturated salt solutions to maintain atmospheres with relative humidities in the range from 7 to 75%, at temperatures between 15 and 80ºC. GAB medel was used to fit the experimental data and the three parameters of GAB equation were evaluated. The Clausisus-Clapeyron equations was applied to obtain the net isosteric heats of sorption, using the desorption isotherm¿s data. It was verified that the annatto seeds can be conserved with higher stability in atmospheres with relative humidity of 60% in the range of temperatures studied. The quantification of the influences of the inlet variables of the process in the final moisture and bixin contents of the seeds and the identification of the optimal point for the process was accomplished by techniques of fractional factorial design, response surface methodology, canonical analysis and desirability function. Its was verified that the final moisture content of the seeds can be estimated by a second order polynomial model as a function of the is temperature and mass flow rate and of the dryng time, and that final bixin content is significantly influenced only by the process time, being described appropriately by linear model.Acesso AbertoSecagemUrucuzeiroBixa orellanaHigroscopicidadeSecagem em leito fixoUrucumTeseCNPQ::ENGENHARIAS::ENGENHARIA QUIMICA::TECNOLOGIA QUIMICA::PRODUTOS NATURAISCNPQ::CIENCIAS AGRARIAS::ENGENHARIA AGRICOLA::ENGENHARIA DE PROCESSAMENTO DE PRODUTOS AGRICOLAS::PRE-PROCESSAMENTO DE PRODUTOS AGRICOLASENGENHARIA DE PROCESSOS - UNICAMP