Geometric parameters influencing production of O/W emulsions using flat metallic membranes and scale-up

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• 作者：Miguel A. Suá ; rez ; Gemma Gutié ; rrez ; José ; Coca ; Carmen Pazos ; ^{cpazos@uniovi.es}
• 关键词：Membrane emulsification ; Flat metallic membrane ; Stirred tank ; Geometric parameters ; Scale-up
• 刊名：Journal of Membrane Science
• 出版年：2013
• 出版时间：1 March, 2013
• 年：2013
• 卷：430
• 期：Complete
• 页码：140-149
• 全文大小：726 K

文摘

The influence of geometric parameters (e.g., tank dimensions, diameter and position of impeller, continuous phase height-to-tank diameter ratio and impeller-to-tank diameter ratio) on the droplet size of emulsions produced by membrane emulsification has been studied. Two flat metallic membranes with pore sizes of 5 ¦Ìm and 50 ¦Ìm were used to prepare oil-in-water (O/W) emulsions in stirred tanks. Results show that the influence of geometric parameters depends on the rotational speed of the impeller. Under optimal geometric conditions, it was possible to obtain emulsions with minimum droplet sizes of 45 ¦Ìm and 105 ¦Ìm and span values of 0.60 and 0.53 using membranes with pore sizes of 5 ¦Ìm and 50 ¦Ìm, respectively. Scale-up experiments were carried out with different tanks and impellers, while maintaining geometric similarity. Emulsions with the same droplet size distributions were obtained using the impeller tip speed as the scale-up criterion.