Controlled Release of Ammonium Nitrate from Ethylcellulose Coated Formulations
| Autor: | Susana Pérez-García, F. Flores-Céspedes, Emilio González-Pradas, M. Fernández-Pérez, M. Villafranca-Sánchez |
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| Rok vydání: | 2007 |
| Předmět: |
Active ingredient
Dibutyl phthalate General Chemical Engineering Ammonium nitrate Granule (cell biology) Inorganic chemistry Plasticizer Environmental pollution General Chemistry Controlled release Industrial and Manufacturing Engineering Dibutyl sebacate chemistry.chemical_compound chemistry Nuclear chemistry |
| Zdroj: | Industrial & Engineering Chemistry Research. 46:3304-3311 |
| ISSN: | 1520-5045 0888-5885 |
| DOI: | 10.1021/ie061530s |
| Popis: | Different ammonium nitrate controlled-release (CR) systems based on ethylcellulose have been investigated to reduce environmental pollution derived from nitrogen-fertilizer use. Coated ammonium nitrate granules were produced in Wurster-type fluidized-bed equipment using two different amounts of ethylcellulose. The highest one was modified by the addition of two plasticizers, dibutyl sebacate, and dibutyl phthalate. Having researched the encapsulation efficiency and the homogeneity of the coated granules, we carried out the kinetic-release experiments in water and soil. The release rate of the active ingredient was related to the thickness of the coating film, granule size, and type of plasticizer used. Using an empirical equation, the time taken for 50% of the active ingredient to be released into water and soil (T50) was calculated. From the analysis of the T50 values, we can deduce that the release rate of ammonium nitrate can be controlled, mainly changing the thickness of the coating film and using pl... |
| Databáze: | OpenAIRE |
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