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Title: A study of sieve plate performance in distillation
Author: Bernard, James Douglas Thornton
Awarding Body: University of London
Current Institution: Imperial College London
Date of Award: 1968
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The effects of plate geometry and vapour and liquid loading on the performance of a sieve plate distillation column have been investigated. A sixteen inch diameter column was used with the binary system normal and isopentane. The results of experiments to measure plate pressure drops, liquid hold-ups, foam heights, foam density profiles on the plate and in the downcomer, liquid entrainment, liquid mixing and separation efficiencies, are presented and discussed. The experiments were carried out at total reflux and the main parameters varied were vapour rate, hole diameter, hole spacing and height of the outlet weir. The influence of a foam baffle at the outlet weir was also studied. A full factorial design at three levels is used to analyse the results of the experiments. The hole diameter is found to be unimportant, but the remaining factors present no simple pattern of behaviour. The liquid hold-ups and plate pressure drops correlate fairly well with vapour hole velocity, and liquid entrainment is correlated using the method of Hunt et al (67). The large amounts of liquid entrainment encountered made calculation of liquid mixing and separation efficiencies impossible for a great many experiments, using existing techniques. Theories have been developed which can take liquid entrainment into account when determining liquid mixing and separation efficiency, but the numerical solutions of the derived equations have not to date been satisfactory. Conventional design methods are shown to be inadequate for predicting all the factors studied, particularly when using a foam baffle.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available