A Mass Transfer Model for Devolatilization of Highly Viscous Media in Rotating Packed Bed

Abstract

Abstract: A mass transfer model for devolatilization process of highly viscous media in rotating packed bed(RPB) was developed based on penetration theory and mass conservation.Before establishing the model,some mass transfer experiments of thin film were conducted in a designed diffusion cell including vacuum and feeding system. In this study,acetone was used as the volatile organic compound(VOC) and syrup as the highly viscous media.The thickness of thin film was changed by using different liquid distributor.It was found that bubbling played an important role in the devolatilization.The correlation of diffusion coefficient of acetone in highly viscous dilute solution was proposed.The relative error between predicted and experimental data was within the range of ± 30% for diffusion coefficient of acetone in syrup.A comparison of experimental data of RPB with model indicated that the relative error was within ± 30% for efficiency of acetone removal.

Key words: mass transfer, highly viscous liquid, volatile organic compound, diffusion coefficient, rotating packed bed

摘要： A mass transfer model for devolatilization process of highly viscous media in rotating packed bed(RPB) was developed based on penetration theory and mass conservation.Before establishing the model,some mass transfer experiments of thin film were conducted in a designed diffusion cell including vacuum and feeding system. In this study,acetone was used as the volatile organic compound(VOC) and syrup as the highly viscous media.The thickness of thin film was changed by using different liquid distributor.It was found that bubbling played an important role in the devolatilization.The correlation of diffusion coefficient of acetone in highly viscous dilute solution was proposed.The relative error between predicted and experimental data was within the range of ± 30% for diffusion coefficient of acetone in syrup.A comparison of experimental data of RPB with model indicated that the relative error was within ± 30% for efficiency of acetone removal.

关键词: mass transfer, highly viscous liquid, volatile organic compound, diffusion coefficient, rotating packed bed

LI Woyuan, WU Wei, ZOU Haikui, CHU Guangwen, SHAO Lei, CHEN Jianfeng. A Mass Transfer Model for Devolatilization of Highly Viscous Media in Rotating Packed Bed[J]. , 2010, 18(2): 194-201.

李沃源, 毋伟, 邹海魁, 初广文, 邵磊, 陈建峰. A Mass Transfer Model for Devolatilization of Highly Viscous Media in Rotating Packed Bed[J]. , 2010, 18(2): 194-201.

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