Nutrient release characteristics and coating homogeneity of biopolymer coated urea as a function of fluidized bed process variables
The present study investigates the effect of fluid-bed process parameters on the diffusion coefficient of nitrogen release and coating homogeneity of controlled-release urea (CRU) produced in a rotary fluidized bed using polyvinyl-alcohol-modified starch as a coating material. An existing mathematic...
Saved in:
Main Authors: | , , , |
---|---|
Format: | Article |
Published: |
Wiley-Liss Inc.
2017
|
Online Access: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85007418129&doi=10.1002%2fcjce.22741&partnerID=40&md5=396a92b305b9bcc8647650f6e1cdd09d http://eprints.utp.edu.my/19505/ |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
id |
my.utp.eprints.19505 |
---|---|
record_format |
eprints |
spelling |
my.utp.eprints.195052018-04-20T06:04:44Z Nutrient release characteristics and coating homogeneity of biopolymer coated urea as a function of fluidized bed process variables Azeem, B. KuShaari, K. Man, Z. Trinh, T.H. The present study investigates the effect of fluid-bed process parameters on the diffusion coefficient of nitrogen release and coating homogeneity of controlled-release urea (CRU) produced in a rotary fluidized bed using polyvinyl-alcohol-modified starch as a coating material. An existing mathematical model was used to estimate the diffusion coefficient. The coefficient of variance of size distribution and coating mass variation are reported as a measure of coating homogeneity. Statistical analysis suggested that the most influential process variables that govern urea release characteristics and coating homogeneity were (a) fluidizing gas temperature and (b) coating time. A moderate spray rate combined with longer coating time yielded the lowest diffusion coefficient for nutrient release. Elutriation as the result of elevated fluidizing gas temperature allowed a higher diffusion coefficient due to lower coating thickness. Burst release patterns were observed for granules with coating imperfections. The augmented temperature of fluidizing gas had a negative effect on coating mass and size distribution of CRU granules but the influence of longer coating time was positive. © 2016 Canadian Society for Chemical Engineering Wiley-Liss Inc. 2017 Article PeerReviewed https://www.scopus.com/inward/record.uri?eid=2-s2.0-85007418129&doi=10.1002%2fcjce.22741&partnerID=40&md5=396a92b305b9bcc8647650f6e1cdd09d Azeem, B. and KuShaari, K. and Man, Z. and Trinh, T.H. (2017) Nutrient release characteristics and coating homogeneity of biopolymer coated urea as a function of fluidized bed process variables. Canadian Journal of Chemical Engineering, 95 (5). pp. 849-862. http://eprints.utp.edu.my/19505/ |
institution |
Universiti Teknologi Petronas |
building |
UTP Resource Centre |
collection |
Institutional Repository |
continent |
Asia |
country |
Malaysia |
content_provider |
Universiti Teknologi Petronas |
content_source |
UTP Institutional Repository |
url_provider |
http://eprints.utp.edu.my/ |
description |
The present study investigates the effect of fluid-bed process parameters on the diffusion coefficient of nitrogen release and coating homogeneity of controlled-release urea (CRU) produced in a rotary fluidized bed using polyvinyl-alcohol-modified starch as a coating material. An existing mathematical model was used to estimate the diffusion coefficient. The coefficient of variance of size distribution and coating mass variation are reported as a measure of coating homogeneity. Statistical analysis suggested that the most influential process variables that govern urea release characteristics and coating homogeneity were (a) fluidizing gas temperature and (b) coating time. A moderate spray rate combined with longer coating time yielded the lowest diffusion coefficient for nutrient release. Elutriation as the result of elevated fluidizing gas temperature allowed a higher diffusion coefficient due to lower coating thickness. Burst release patterns were observed for granules with coating imperfections. The augmented temperature of fluidizing gas had a negative effect on coating mass and size distribution of CRU granules but the influence of longer coating time was positive. © 2016 Canadian Society for Chemical Engineering |
format |
Article |
author |
Azeem, B. KuShaari, K. Man, Z. Trinh, T.H. |
spellingShingle |
Azeem, B. KuShaari, K. Man, Z. Trinh, T.H. Nutrient release characteristics and coating homogeneity of biopolymer coated urea as a function of fluidized bed process variables |
author_facet |
Azeem, B. KuShaari, K. Man, Z. Trinh, T.H. |
author_sort |
Azeem, B. |
title |
Nutrient release characteristics and coating homogeneity of biopolymer coated urea as a function of fluidized bed process variables |
title_short |
Nutrient release characteristics and coating homogeneity of biopolymer coated urea as a function of fluidized bed process variables |
title_full |
Nutrient release characteristics and coating homogeneity of biopolymer coated urea as a function of fluidized bed process variables |
title_fullStr |
Nutrient release characteristics and coating homogeneity of biopolymer coated urea as a function of fluidized bed process variables |
title_full_unstemmed |
Nutrient release characteristics and coating homogeneity of biopolymer coated urea as a function of fluidized bed process variables |
title_sort |
nutrient release characteristics and coating homogeneity of biopolymer coated urea as a function of fluidized bed process variables |
publisher |
Wiley-Liss Inc. |
publishDate |
2017 |
url |
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85007418129&doi=10.1002%2fcjce.22741&partnerID=40&md5=396a92b305b9bcc8647650f6e1cdd09d http://eprints.utp.edu.my/19505/ |
_version_ |
1738656079681683456 |
score |
13.160551 |