The effect of crystal surface roughness on impurity adsorption

被引：8
|
作者：
Ferreira, A. [1 ]
Faria, N. [2 ]
Rocha, F. [1 ]
机构：
[1] Univ Porto, Fac Engn, Dept Engn Quim, P-4200465 Oporto, Portugal
[2] BIOTEMPO Consultoria Biotecnol Lda, P-4806909 Caldas Das Taipas, Portugal
来源：
CRYSTAL RESEARCH AND TECHNOLOGY | 2009年 / 44卷 / 05期
关键词：
crystallisation; surface roughness; impurities; adsorption; BY-FACE GROWTH; SUCROSE CRYSTALS; AQUEOUS-SOLUTIONS; SEGREGATION COEFFICIENT; SUPERSATURATION; CRYSTALLIZATION; MORPHOLOGY; RAFFINOSE; MODEL; IONS;
D O I：
10.1002/crat.200800412
中图分类号：
O7 [晶体学];
学科分类号：
0702 ; 070205 ; 0703 ; 080501 ;
摘要：
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
引用
收藏
页码：521 / 533
页数：13
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