(195c) Effect of Liquid Viscosity on Liquid Film Mass Transfer Coefficient for Structured and Random Packings
- Conference: AIChE Spring Meeting and Global Congress on Process Safety
- Year: 2017
- Proceeding: 2017 Spring Meeting and 13th Global Congress on Process Safety
- Group: Kister Distillation Symposium
- Time: Thursday, March 30, 2017 - 9:05am-9:35am
This work investigated the effect of liquid viscosity on kL by air stripping of toluene from aqueous solutions of glycerol in a semi-works scale (0.43 m I.D.) packed column. The liquid viscosity was varied 1â60 cP by varying the glycerol concentration 0â89 wt %. Packings with different specific area, corrugation angle, and special corrugation channel design were investigated. A total of nine packings were studied, which include seven structured packings (Mellapak 125Y, Mellapak 250X, Mellapak 250Y, GTC GT-OPTIMPAK 250Y, GTC GT-PAK 350Y, GTC GT-PAK 500Y and Montz B1 250 MN,) and two random packings (Raschig Super Rings # 0.5 and # 1.5).
Based on a previous study that showed liquid viscosity has insignificant effect of mass transfer area, a new kL model was developed that showed the total dependence on liquid viscosity of kL was -0.89, in which -0.35 was the indirect dependence via diffusivity, and the rest was the direct dependence through liquid turbulence on the packing surface. Liquid viscosity has a similar effect on structured and random packings. Compared to existing kL correlations, this work utilizes a large database of packings, a wider range of liquid viscosity, reliable experimental data of mass transfer area, and relatively large size of column.
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