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Hydrodynamics and mass transfer coefficients for a modified Raschig ring packed column

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Abstract

The pressure drop, the liquid holdup, as well as the liquid film mass transfer coefficients (kL) for a modified Raschig packing, with turbulence promoters, used in absorption columns, were determined experimentally. The aim of this work is to verify the improved mass transfer properties of this new packing for the randomly and, particularly, for the arranged packed columns. The experiments were performed at gas velocities ranging from 800 to 2,000 m h−1 and liquid velocities scaling between 2.5 and 8.11 m h−1, ranges that cover most of the absorption column operation conditions. Experimental data and correlations for the pressure drop, the liquid holdup and the gas–liquid mass transfer coefficients (kL) for modified Raschig ring packed columns are presented. The influence of the gas and the liquid velocities on the column hydrodynamics and the mass transfer coefficients have been obtained experimentally and also, have been compared with literature data.

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Abbreviations

at :

Total specific surface area (m2 m−3)

A:

Area (m2)

C:

Constant

d:

Diameter (m)

D:

Diffusion coefficient (m2 s−1)

F:

Gas load factor (Pa0.5)

Fr:

Froude number (dimensionless)

g:

Gravitational acceleration (m s−2)

hL :

Liquid holdup (m3 m−3 packing)

kH :

Henry’s constant (N m−2)

k:

Mass transfer coefficient (m3 m−2 h−1)

K:

Total mass transfer coefficient (m h−1)

KW :

Wall factor

L:

Liquid flowrate (m3 h−1)

N:

Solute volumic flowrate (m3 h−1)

n:

Exponent

p:

Partial pressure (N m−2)

Δp:

Pressure drop (N m−2)

Re:

Reynolds number (dimensionless)

u:

Velocity with reference to the free column cross-section (m3 m−2 s−1)

ū:

Mean effective velocity (m s−1)

T:

Temperature (K)

V:

Bed volume (m3)

X:

CO2 liquid concentration (mol CO2 mol water−1)

We:

The Weber number (dimensionless)

Z:

Packing height (m)

η:

Dynamic viscosity (Pa s)

σ:

Surface tension (N m−1)

ρ:

Density (kg m−3)

ε:

Void fraction (m3 m−3)

ν:

Kinematic viscosity (m2 s−1)

Ψ:

Resistance coefficient

b:

Bed

h:

Hydraulic

in:

At the column inlet

L:

Liquid phase

out:

At the column outlet

p:

Particle

V:

Gas or vapor

w:

Wetted

*:

At equilibrium

0:

Untrickled packing

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Authors and Affiliations

  1. Faculty of Chemical Engineering and Environmental Protection, “Gh.Asachi” Technical University of Iasi, 71 Bd.D.Mageron, 700050, Iasi, Romania

    I. Mamaliga, D. Sidor, C. Condurat & E. T. Iacob Tudose

Authors
  1. I. Mamaliga
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  2. D. Sidor
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  3. C. Condurat
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  4. E. T. Iacob Tudose
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Correspondence to E. T. Iacob Tudose.

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Mamaliga, I., Sidor, D., Condurat, C. et al. Hydrodynamics and mass transfer coefficients for a modified Raschig ring packed column. Heat Mass Transfer 50, 1385–1392 (2014). https://doi.org/10.1007/s00231-014-1324-2

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  • DOI: https://doi.org/10.1007/s00231-014-1324-2

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