Abstract
The present work aims to evaluate the hydrodynamics of a pulsed packed extractor, with an internal diameter of 0.026m and a length of 1.0m, using the liquid butanol-water system. Thus, the basic parameters obtained for the hydrodynamic study of the extraction column in question as dispersed phase, slip velocity, characteristic velocity and flooding point. The methodology used in the work consisted of determining the holdup fraction of the dispersed phase, obtained through tests of simultaneous interruptions in the column feedings. The effects of frequency pulsation, dispersed phase flow rate and continuous phase flow rate investigated in the analysis of these parameters. New empirical correlations derived from the predictions of the parameters studied obtained in terms of operating variables and physical properties of the liquid system involved. The average absolute value of the relative error (AARE) was always below 5.6%. Good agreement between calculated and experimental results observed for all investigated operating conditions.
Highlights
The extraction processes are suitable for the petrochemical industry to separate aliphatic and aromatic components, for the biochemical industry in the separation of antibiotics and protein recovery, in the separation of spent fuel elements and inorganic chemical (Henley & Seader, 1981)
This paper aims to investigate the dispersed phase holdup, slip and characteristics velocity and evaluate the maximum capacity in terms of point flood in a pulsed packed column as a function of frequency pulsation and phases ratio to n-butanol/water system
The more dispersed in the environment smaller drops the dispersed phase holdup get higher
Summary
The extraction processes are suitable for the petrochemical industry to separate aliphatic and aromatic components, for the biochemical industry in the separation of antibiotics and protein recovery, in the separation of spent fuel elements and inorganic chemical (Henley & Seader, 1981). According to Simons (1983); Asadollahzadeh et al (2012), these columns have a great advantage over the others, since the pulse unit can be removed from the column and the absence of moving mechanical parts makes easier for any future repair. These columns are classified as differential extractors due to the countercurrent flow be established in function of the density difference between the fluids (Kumar et al, 1986). The dispersed phase holdup is related to mass transfer area and the flooding of the column. The dispersed phase holdup is expressed as follows (Treybal, 1963; Napeida et al, 2010):
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