scholarly journals Effect of Coating Thickness on Release Characteristics of Controlled Release Urea Produced in Fluidized Bed Using Waterborne Starch Biopolymer as Coating Material

2016 ◽  
Vol 148 ◽  
pp. 282-289 ◽  
Author(s):  
Babar Azeem ◽  
KuZilati KuShaari ◽  
Zakaria Man
Keyword(s):  
Controlled Release ◽  
Fluidized Bed ◽  
Coating Thickness ◽  
Coating Material ◽  
Controlled Release Urea

scholarly journals Production and Characterization of Controlled Release Urea Using Biopolymer and Geopolymer as Coating Materials

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 400 ◽  
Author(s):  
Babar Azeem ◽  
Kuzilati KuShaari ◽  
Muhammad Naqvi ◽  
Lau Kok Keong ◽  
Mohammed Khaloofah Almesfer ◽  
...  
Keyword(s):  
Controlled Release ◽  
Fluidized Bed ◽  
Air Temperature ◽  
Process Parameters ◽  
Interactive Effect ◽  
Process Time ◽  
Nitrogen Release ◽  
Coating Materials ◽  
Spray Rate ◽  
Controlled Release Urea

Synthetic polymers-based controlled release urea (CRU) leaves non-biodegradable coating shells when applied in soil. Several alternative green materials are used to produce CRU, but most of these studies have issues pertaining to nitrogen release longevity, process viability, and the ease of application of the finished product. In this study, we utilized tapioca starch, modified by polyvinyl alcohol and citric acid, as coating material to produce controlled release coated urea granules in a rotary fluidized bed equipment. Response surface methodology is employed for studying the interactive effect of process parameters on urea release characteristics. Statistical analysis indicates that the fluidizing air temperature and spray rate are the most influential among all five process parameters studied. The optimum values of fluidizing air temperature (80 °C), spray rate (0.13 mL/s), atomizing pressure (3.98 bar), process time (110 min), and spray temperature (70 °C) were evaluated by multi-objective optimization while using genetic algorithms in MATLAB®. Urea coated by modified-starch was double coated by a geopolymer to enhance the controlled release characteristics that produced promising results with respect to the longevity of nitrogen release from the final product. This study provides leads for the design of a fluidized bed for the scaled-up production of CRU.

Synthesis of Biodegradable Mixing-Polymer as Coating Material for Controlled-Release Urea Fertilizer

2019 ◽  
Vol 1152 ◽  
pp. 43-51 ◽  
Author(s):  
Huu Trung Nguyen ◽  
Van Dat Doan ◽  
Van Dung Trinh
Keyword(s):  
Controlled Release ◽  
Low Cost ◽  
Coating Material ◽  
Urea Fertilizer ◽  
Bonding Structure ◽  
Physico Chemical ◽  
Coating Method ◽  
Urea Release ◽  
Kinetics Of ◽  
Controlled Release Urea

The biodegradable mixing-polymer as low cost, environmentally friendly coating material for controlled-release urea fertilizer was synthesized by borax crosslinked phosphated distarch phosphate (PDSP)/polyvinyl alcohol (PVA) and polyacrylic acid (PAA) via pan coating method. The physico-chemical characteristics of biodegradable mixing-polymer were confirmed by FTIR, TGA and SEM techniques. The kinetics of urea release were also carefully investigated in water and soil. It’s been found that a uniform layer with better bonding structure was created on surface of the mixing-polymer PDSP/PVA-PAA and the time released 70% urea reached 6 hours in water and more than 27 days in soil.

Optimization of Pan Coating Process for Increased Efficiency of Controlled-Release Urea Fertilizer

2021 ◽  
Vol 57 (4) ◽  
pp. 333-342
Author(s):  
Trung Huu Nguyen ◽  
Tran Nguyen Minh An ◽  
Mahboob Alam ◽  
Duc Hoai Tran ◽  
Nghi Tran ◽  
...  
Keyword(s):  
Controlled Release ◽  
Layer Thickness ◽  
Release Time ◽  
Coating Process ◽  
Analysis Method ◽  
Sauter Mean Diameter ◽  
Urea Fertilizer ◽  
The Relationship ◽  
Central Composite ◽  
Controlled Release Urea

The goal of the research is to develop an experimental mathematical model of pan coating process effect on the biodegradable polymer and to determine optimal process parameters. The polymer solution was conducted with phosphated di-starch phosphate, polyvinyl alcohol, and polyacrylic acid and performed as material coating for the controlled-release urea fertilizer. The image analysis method has been used to determine the particle size distribution, Sauter mean diameter of the particle and layer thickness that is novel. The central composite rotatable design has been selected to determine the regression models of the process, which described the relationship between two objective variables as layer thickness, release time with angle of pan, spray flow, and coating time. The statistical analysis results indicate the fitness of model.

The effects of controlled release urea on maize productivity and reactive nitrogen losses: A meta-analysis

2019 ◽  
Vol 246 ◽  
pp. 559-565 ◽  
Author(s):  
Wushuai Zhang ◽  
Zhengyuan Liang ◽  
Xiaoming He ◽  
Xiaozhong Wang ◽  
Xiaojun Shi ◽  
...  
Keyword(s):  
Controlled Release ◽  
Meta Analysis ◽  
Nitrogen Losses ◽  
Reactive Nitrogen ◽  
Maize Productivity ◽  
Controlled Release Urea

scholarly journals Reducing nitrogen pollution while improving tomato production by controlled-release urea application

2018 ◽  
Vol 64 (5) ◽  
pp. 632-641 ◽  
Author(s):  
Jungang Yang ◽  
Shangqiang Liao ◽  
Yanmei Li ◽  
Bing Cao ◽  
Yanxin Sun ◽  
...  
Keyword(s):  
Controlled Release ◽  
Nitrogen Pollution ◽  
Tomato Production ◽  
Controlled Release Urea

Bio‐based epoxy modified with nano‐SiO 2 and organosilicon for controlled‐release urea

2021 ◽  
pp. 51810
Author(s):  
Songling Chen ◽  
Yanyu Han ◽  
Chunyu Chen ◽  
Hongdou Liu ◽  
Hongtao Zou
Keyword(s):  
Controlled Release ◽  
Controlled Release Urea
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