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Received December 15, 2007
Accepted May 29, 2008
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Performance and applications of flow-guided sieve trays for distillation of highly viscous mixtures
1College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China 2State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China 3Tianjin Zhong-De Vocational Technology Institute, Tianjin 300191, China
hliu@mail.buct.edu.cn
Korean Journal of Chemical Engineering, November 2008, 25(6), 1509-1513(5), 10.1007/s11814-008-0248-2
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Abstract
With a particular focus on the distillation of highly viscous or self-polymerized mixtures, this study reports the hydrodynamic and mass transfer performance of two flow-guided sieve trays, including their pressure drop, entrainment, weeping and tray efficiency, obtained experimentally with an air-water/oxygen system in a Φ600 mm plexiglass column. The results show that the 8 mm hole flow-guided sieve tray tested shows better characteristics than the 7 mm flow-guided hole tray in terms of pressure drop and mass transfer. Then we present practical industrial examples of applications of the flow guided trays for distillation of viscous mixtures, i.e., the separation of vinyl acetate (VAC) from a polyvinyl acetate (PVAC) polymer solution with dynamic viscosity μ=50,000 mPas, the separation of highly unsaturated C5 mixtures by extractive distillation, and the distillation of thick, condensed and highly viscous fermentation mixtures_x000D_
made from fermented mash. It is demonstrated that flow-guided sieve trays with relatively large holes are an excellent candidate for distillation of mixtures with suspended solids, or concentrated/self-polymerized polymer solutions.
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Bocker S, Ronge G, Chem. Eng. Technol., 28(1), 25 (2005)
Lei ZG, Chen BH, Ding ZW, Special distillation processes, Elsevier B.V., Amsterdam (2005)
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Weiler DW, Bonnet FW, Leavitt FW, Chem. Engrg. Progr, 67, 86 (1971)
