The effect of crystal surface roughness on impurity adsorption

• Type: Article in International Scientific Journal
• Date: 2009

Authors

Ferreira, A (Author) FEUP; Faria, N (Author) Other; Rocha, F (Author) FEUP

Journal

Title: Crystal Research and Technology

Vol. 44 No. 5

Pages: 521-533

ISSN: 0232-1300

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 4 Citations

ISI Web of Science

Scopus - 8 Citations

Scientific classification

CORDIS: Technological sciences > Engineering > Chemical engineering

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: P-003-K99

DOI: 10.1002/crat.200800412

Abstract (EN): The effect of crystal surface roughness on impurity adsorption was investigated in a fluidized bed crystallizer and in a batch crystallizer. The crystallisation of sucrose in pure and impure systems was the study subject. Calcium chloride was utilized as impurity in this work. The results show that the impurity adsorption is growth rate dependent and is strongly influenced by the crystal surface properties. Crystals with high surface roughness have lower impurity adsorption. Based on experimental evidences, a new theoretical model is proposed to quantify the surface roughness influence on the impurity adsorption, allowing, by operating at the more adequate supersaturation, to control the impurity transfer into crystals. The used impurity does not have a significant influence on the growth rates at the studied temperatures. (C) 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 13