Design of liquid-liquid contractor for the experimental studies of mass transfer : the evaluation of interface mass transfer coefficients on the binary system water-n-butanol Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/d217qr99f

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  • A contactor has been designed and constructed for experimental studies of mass transfer with or without chemical reaction between two fluid phases. The contactor is flexible enough to investigate a wide range of variables affecting mass transfer coefficients. It is easy to operate; it could be operated either as a batch process or continuous process. The testing of the contactor verified the uniform mixing within a phase and the stability of the interface within the desired range of agitation. Water-n-butanol system was used to verify the contactor and to evaluate the mass transfer coefficient. A new concept was deduced to explain the turbulent mass transfer across liquid-liquid interface. It was found that when both phases were agitated at the same speed, there was no effect of the Reynolds number of one phase on the other phase mass transfer coefficient. These mass transfer coefficient values versus the agitated rates (or Reynolds number in each phase) were callsed asymtotic values or asymtotic line. If the agitation rate (rps) of a given phase is lower than the agitation in the other phase, its mass transfer coefficient is influenced by the mixing within the other phase below a critical Reynolds number, while the influence diminishes above it and its mass transfer coefficient approaches its asymtotic values. New simple correlations were developed for the water and organic liquid mass transfer coefficients. These correlations verified a diffusivity dependency of 0.5 for low diffusivity values and a diffusivity dependency of 0.67 for larger diffusivity values. This was in agreement with the King model for explaining mass transfer coefficients based upon interfacial turbulence. Since the asymtotic line conditions for both water and organic phases seems to represent the desired range of many industrial process conditions, the asymtotic mass transfer coefficient values with their corresponding agitation rate or Reynolds number were used to develop the correlations. The contactor, the new concepts about the transport phenomena in turbulent mass transfer across the liquid-liquid interface, and the new correlations will be useful in future studies toward design of industrial equipment.
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