COATING OF UREA WITH AN AQUEOUS POLYMERIC SUSPENSION IN A TWO-DIMENSIONAL SPOUTED BED
- 25 March 2002
- journal article
- Published by Taylor & Francis in Drying Technology
- Vol. 20 (3) , 685-704
- https://doi.org/10.1081/drt-120002824
Abstract
In this work, a process of coating of urea with polymeric film was developed and analyzed experimentally in a two-dimensional spouted bed. An experimental design was utilized to investigate the effects of operational variables, e.g., air flow rate, air temperature, atomizing air pressure and coating suspension flow rate, on the efficiency of the process, particles growth, particles growth kinetics and physical properties. The results showed that the efficiency of the process and particle growth characteristics were strongly influenced by the operational variables. Coating of the polymeric suspension of Eudragit® improved up to four times the moisture holding capacity of coated urea in relation to uncoated urea. The bulk density, grain size and sphericity were found to be independent of operational conditions.Keywords
This publication has 8 references indexed in Scilit:
- Membrane-encapsulated controlled-release urea fertilizers based on acrylamide copolymersJournal of Applied Polymer Science, 1996
- Use of Kraft Pine Lignin in Controlled-Release Fertilizer FormulationsIndustrial & Engineering Chemistry Research, 1996
- Controlled-release fertilizers to increase efficiency of nutrient use and minimize environmental degradation - A reviewNutrient Cycling in Agroecosystems, 1993
- Polyethylene-coated urea. 1. Improved storage and handling propertiesIndustrial & Engineering Chemistry Research, 1989
- Polymer coating on urea prills to reduce dissolution rateJournal of Agricultural and Food Chemistry, 1988
- Hydrodynamics, heat and mass transfer during coating of tablets in a spouted bedThe Canadian Journal of Chemical Engineering, 1983
- Laboratory studies on sulphur‐coating urea by the spouted bed processThe Canadian Journal of Chemical Engineering, 1983
- Sulfur-coated fertilizers for controlled release. Pilot-plant productionJournal of Agricultural and Food Chemistry, 1971