Drying of suspensions and solutions on inert particle surface in mechanically spouted bed dryer --颗粒学报PARTICUOLOGY

Pallai-Varsányi, E., Tóth, J., & Gyenis, J. (2007). Drying of suspensions and solutions on inert particle surface in mechanically spouted bed dryer. China Particuology, 5(5), 337–344. https://doi.org/10.1016/j.cpart.2007.06.003

Drying of suspensions and solutions on inert particle surface in mechanically spouted bed dryer

Elisabeth Pallai-Varsányi ^a, Judit Tóth ^b *, János Gyenis ^a

a University of Pannonia, Faculty of Information Technology, Research Institute of Chemical and Process Engineering, Egyetem u. 2, H-8200 Veszprém, Hungary
b Hungarian Academy of Sciences, Chemical Research Centre, Institute of Materials and Environmental Chemistry, Pusztaszeri u. 59-67, H-1025 Budapest, Hungary

10.1016/j.cpart.2007.06.003

Volume 5, Issue 5, October 2007, Pages 337-344

Received 1 April 2006, Accepted 13 June 2007, Available online 18 September 2007.

E-mail: toth@mukki.richem.hu

Highlights

Abstract

To eliminate some disadvantages of the conventional spouted bed dryers the mechanically spouted bed (MSB) system was developed. This dryer type is convenient to use inert particles providing an increased surface area for drying of materials of high-moisture content and heat sensitive materials. On three different drying tasks are demonstrated the experimental optimization of process parameters to obtain products of demanded quality. The main object was at drying of AlO(OH) suspension to preserve the particle size under 2.5 μm and to obtain product with a moisture content of about 0.05 kg/kg (d.b.). For this reason a very thin particle coating and intensive abrasion had to be assured. At drying of tomato concentrates the thermoplasticity makes the process very difficult. To jump over the deliquescent and sticky state developed at the critical temperature–moisture content values a very short drying time (8–10 s) must be provided. The third task was to form powder-like product from bovine serum albumin (BSA) solution having very low solid content (2–4%). The selected process parameters given in this paper resulted in a mean particle size of less than 20 μm while the soluble preserved protein content was higher than 90%.

Graphical abstract

Keywords

Mechanically spouted bed; Film-like dryingInert particles; Heat sensitive material

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