Abstract
Results of experimental studies of heat-and-mass transfer and hydrodynamic processes at distillation on a regular packing are presented. The mixture of freons R114–R21 at the pressure of 0.3 MPa was used as a working mixture. The mixture was separated on the Mellapak 350Y structured packing with the diameter of 0.9 m under the conditions of complete reflux ( L/V = 1) at different packing heights. A specially designed liquid distributor with a possibility to change the density and pattern of drip points was used to irrigate the packing. The experimental data on the efficiency of mixture separation (height of transfer unit HTU ) and distribution of the local flow rate density over the column cross-section were compared. It is shown that an increase in the height of the structured packing from 2.1 m to 4.0 m leads to a significant decrease in the efficiency of mixture separation in the distillation column.
Highlights
Results of research and operation of industrial distillation columns with the regular packing have shown that often separation efficiency can decrease with an increase in their height and diameter, and this affects productivity and purity of the finished product
The purpose of this work is to investigate the effect of the regular packing height on the efficiency of Freon mixture separation, formation dynamics of large-scale mal-distribution of the local flow parameters over the packing cross-section along the column height for the given drip point pattern
As it follows from the analysis of experimental data presented in Fig. 2, distribution of the local liquid flow density at the outlet of the packing with the height of 4.0 m is slightly more uniform in comparison with distribution for the packing with the height of 2.1 m
Summary
Results of research and operation of industrial distillation columns with the regular packing have shown that often separation efficiency can decrease with an increase in their height and diameter, and this affects productivity and purity of the finished product. The fundamental phenomena responsible for a decrease in separation efficiency are the effects caused by transverse mal-distribution and longitudinal mixing. These effects relate to the vapor and liquid flow within the column, and they are presented by deviation of productivity and product purity from the calculated values at uniform distribution. The purpose of this work is to investigate the effect of the regular packing height on the efficiency of Freon mixture separation, formation dynamics of large-scale mal-distribution of the local flow parameters over the packing cross-section along the column height for the given drip point pattern
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