Coating of urea with an aqueous polymeric suspension in a two-dimensional spouted bed

被引：66

作者：

Donida, MW ^{[1
]}

Rocha, SCS ^{[1
]}

机构：

[1] State Univ Campinas, Sch Chem Engn, Lab Fluid Dynam & Drying, BR-13083970 Campinas, SP, Brazil

来源：

DRYING TECHNOLOGY | 2002年 / 20卷 / 03期

基金：

巴西圣保罗研究基金会;

关键词：

coating; fertilizers; spouted bed; drying; atomization;

D O I：

10.1081/DRT-120002824

中图分类号：

TQ [化学工业];

学科分类号：

0817 [化学工程与技术];

摘要：

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(R) 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.

引用

页码：685 / 704

页数：20

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