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Journal article

Fluidized-Bed Coating with Sodium Sulfate and PVA-TiO2, 2. Influence of Coating Solution Viscosity, Stickiness, pH, and Droplet Diameter on Agglomeration

By Hede, Peter Dybdahl1,2; Bach, Poul; Jensen, Anker Degn1,2

From

CHEC Research Centre, Department of Chemical and Biochemical Engineering, Technical University of Denmark1

Department of Chemical and Biochemical Engineering, Technical University of Denmark2

In the first part of this study [Hede, P. D.; Bach, P.; Jensen, A. D. Ind. Eng. Chem. Res. 2009, 49, 1914], agglomeration regime maps were developed for two types of coatings: sodium sulfate and PVA-TiO2. It was observed here how the agglomeration tendency is always lower for the salt coating process than for the polymer coating process, under similar process conditions.

This is investigated further in this second part and concluded to be due to differences in coating solution stickiness, rather than differences in bulk viscosities. Furthermore, results show that it is possible to optimize the PVA-TiO2 coating formulation and process to achieve a low tendency of agglomeration, similar to that of the salt coating process.

The best results for the PVA-TiO2 solution are obtained by substituting the PVA-TiO2 in equal amounts with Neodol 23-6.5 and further reducing the pH value in the coating solution to pH 4.

Language: English
Year: 2009
Pages: 1905-1913
ISSN: 15205045 and 08885885
Types: Journal article
DOI: 10.1021/ie800941x
ORCIDs: Jensen, Anker Degn

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