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Influence of added packing on the volumetric efficiency in a Karr column

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Abstract

Dispersed phase holdup and volumetric mass transfer coefficient were measured in a reciprocating plate column with high porosity packing in interplate spaces of the column and the performance was compared with that of the column without packing. The data and its analysis show substantial increase in the dispersed phase holdup and in the interfacial area to give an enhancement of 4 to 5 times in the volumetric efficiency of the column with the added packing.

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Abbreviations

C 0 :

orifice coefficient (= 0.7) (-)

g :

acceleration due to gravity, ms−2

HTU :

height of transfer unit, m

K 1, K 2 :

constants in Eqn. (3) and (4) (-)

K 0 α :

volumetric mass transfer coefficient, s−1

M :

Morton number (=μ4g/Δϱσ3)

N/φ :

rate of solute transfer g mols−1

P :

plate spacing, m

S :

plate free area (-)

U :

phase velocity, ms−1

U s :

slip velocity, ms−1

V :

total liquid volume in the test section, m3

V s :

volume % of solids (-)

Z :

pulse velocity, (= amplitude × frequency), ms−1

α c :

ɛ, for benzoic acid (-)

α d :

ɛ, for n-butyric acid (-)

δ c :

K0a/K0a for benzoic acid (-)

δ d :

K0a/K0a for n-butyric acid (-)

ɛ :

dispersed phase holdup (-)

η :

volumetric efficiency, s−1

β :

phase viscosity, Pa s

ϱ :

phase density, k gm−3

Δϱ :

density difference, (ϱcd) k gm−3

ϱ :

weighted average phase density (=ϱdɛ+ϱc(1-ɛ)), k gm−3

σ :

surface tension, N/m

σ 1 :

standard deviation (-)

ψ :

power dissipation Jm−3 s−1

c :

continuous phase

d :

dispersed phase

w :

aqueous phase

1:

bottom of test section

2:

top of test section

2φ :

2-phase

3φ :

3-phase

References

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Prabhavathy, N.K., Joseph, S. & Varma, Y.B.G. Influence of added packing on the volumetric efficiency in a Karr column. Bioprocess Engineering 15, 109–115 (1996). https://doi.org/10.1007/BF00372986

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  • DOI: https://doi.org/10.1007/BF00372986

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