Estudo do recobrimento de celulose microcristalina em leito fluidizado pulsado rotativo / Study of microcrystaline cellulose coating in rotative pulsed fluidized bed
AUTOR(ES)
Marcio Wagner da Silva
DATA DE PUBLICAÇÃO
2006
RESUMO
The coating process of microgranules in a Rotative-Pulsed Fluidized Bed was investigated through the accomplishment of microcrystalline cellulose (MICROCEL) coating experiments. The influence of particle load, gaseous stream pulsation frequency, suspension flow rate, pressure of atomization and drying temperature on the coating efficiency, relative growth and agglomeration index were analyzed and argued. The main objective of this work development was the evaluation of the performance and the behavior of microgranule coating process in fluidized bed equipment with beaten feeding of the gaseous stream, front a conventional fluidized bed equipment, which behavior is widely described in literature. For the inquiry of the coating process, a polymeric suspension of EudragitÒ and MICROCEL particles with diameter range of 0.25 ? 0.42 mm were used. The average relative growth of particles was of 3.63 %. The experiments were carried out according experimental planning techniques, where the obtained experimental results analyses had been carried through the Response Surface Methodology. The analysis of the effect of the independent variable on the process answer variables had been used in the construction of an empirical model, aiming to predict the process behavior, when possible. The analysis of the obtained models was carried out using the variance analysis (ANOVA). The independent variable used had been: suspension flow rate (Ws), atomization pressure (Pat), air temperature (Tar), bed particle load (m) and pulsation frequency (f). Results obtained shown that Rotative-Pulsed Fluidized Bed is an adequate equipment to be used in microgranules coating process in the evaluated operational conditions showing great advantages when compared to conventional fluidized bed, highlighting the agglomerate formation reduction
ASSUNTO(S)
fluidization celulose fluidized bed coatings revestimentos leito fluidizado fluidização cellusose
ACESSO AO ARTIGO
http://libdigi.unicamp.br/document/?code=vtls000381246Documentos Relacionados
- Granulation of microcrystalline cellulose in fluidized bed with draft tube
- Caracterização fluidodinamica no recobrimento de celulose microcristalina em leito fluidizado
- Estudo fluidodinamico de um leito fluidizado pulsado rotativo com particulas secas e umidas
- Fluidodinamica e secagem do polihidroxibutirato (PHB) em leito fluidizado pulsado rotativo
- Fluidodinamica, secagem e recobrimento em leito pulso-fluidizado