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Mass transfer in a reciprocating plate extraction column — effects of mass transfer direction and plate material
Author(s) -
Shen Z. J.,
Rama Rao N. V.,
Baird M. H. I.
Publication year - 1985
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450630106
Subject(s) - reciprocating motion , mass transfer , plate column , continuous phase modulation , sauter mean diameter , coalescence (physics) , materials science , mass transfer coefficient , phase (matter) , volumetric flow rate , analytical chemistry (journal) , chemistry , chromatography , composite material , mechanics , thermodynamics , nozzle , telecommunications , physics , organic chemistry , astrobiology , computer science , gas compressor
The mass transfer performance of 5 cm diameter reciprocating plate column has been measured with the system n ‐butyric acid/kerosene (dispersed)/water (continuous). In most of the tests, the reciprocating plate stack was made of stainless steel which was preferentially wet by the continuous phase. During the mass transfer process the holdup and in some cases the Sauter mean droplet diameter were measured. The mass transfer effectiveness, expressed as the height of a transfer unit ( H ax ) corrected for axial mixing, depended on the phase flow rates, the agitation rate and the direction of mass transfer. For continuous to dispersed phase mass transfer ( c → d ), the mass transfer was more effective, i.e. H ax was lower than for d → c mass transfer under the same external conditions. Qualitative and quantitative observations indicated much larger drop sizes in the d → c case due to enhanced coalescence. Although mass transfer was less effective under d → c conditions, the column capacity was increased. The same effects were also observed when the plate stack was modified by inserting some Teflon plates which were partly wet by the dispersed phase.