Crystal Growth Mechanism of Size-Dependent Systems in a Fluidized Bed

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Clifford Y. Tai¹  Cheng-Yi Shih¹  Jenn-Fang Wu¹ 

[1] Department of Chemical Engineering, National Taiwan University

关键词: Two-Step Model;    Mass-Transfer Coefficient;    Surface-Integration Coefficient;    Fluidized-Bed;    Crystal Size;    Growth Rate;    Crystallization;   

DOI  :  10.1252/jcej.23.562

来源: Maruzen Company Ltd

【 摘 要 】

References(20)Cited-By(4)Based on the two-step model, surface-integration coefficients of potassium alum crystals below 5 × 10–4 m grown in a well-suspended fluidized bed were found to decrease sharply with decreasing crystal size so that the growth process is controlled by surface integration for small crystals. The mass-transfer coefficient is independent of crystal size and solution velocity. The mass-transfer resistance becomes significant when crystal size increases, and finally the growth rates become constant since both mass-transfer and surface-integration coefficients are constant. For larger crystals, there is no dominating step in the growth process, both resistances being important.The crystal growth behavior of various systems other than potassium alum was also examined. Finally, an experimental method for estimating the order of surface-integration rate is suggested.

【 授权许可】

Unknown