Roughness effect on the overall growth rate of sucrose crystals

• Tipo: Artigo em Revista Científica Internacional
• Data: 2008

Autores

Ferreira, A (Autor) FEUP; Faria, N (Autor) Outra; Rocha, F (Autor) FEUP

Revista

Título: Journal of Crystal Growth

Vol. 310 Nº 2

Páginas: 442-451

ISSN: 0022-0248

Editora: Elsevier

Indexação

ISI Web of Knowledge - 8 Citações

Scopus - 8 Citações

COMPENDEX

INSPEC

Classificação Científica

CORDIS: Ciências Tecnológicas > Engenharia > Engenharia química

FOS: Ciências da engenharia e tecnologias > Engenharia dos materiais

Outras Informações

ID Authenticus: P-004-21V

DOI: 10.1016/j.jcrysgro.2007.11.031

Abstract (EN): The roughness effect on crystal growth rate was investigated at 35 degrees C in a fluidized bed crystallizer and in a batch crystallizer. The crystallization of sucrose in pure aqueous solutions was the study subject. The results show that the sucrose crystals exhibit time-dependent growth rate. The overall growth rate decreased continually with time until a constant value was reached, that corresponds to a decrease of 40% considering the experiments of 13 and 63 min duration in the fluidized bed crystallizer. The decrease of the growth rates with the contact time between crystals and supersaturated solution was interpreted in terms of the increase of surfaces' roughness. According to SEM micrographs, the surface roughness increases significantly with residence time and supersaturation. The roughness appears to be the result of faulty integration of growth clusters in the crystal surface. The batch experiments show that the surface roughness acts like a strong impurity. The results were interpreted according to the Kubota-Mullin model.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10