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1

Designing of Membrane Contactors with Cross-Counter Current Flow

100%

Kołtuniewicz A. B., Modelski S., Witek A.

Chemical and Process Engineering

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2012

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vol. 33

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issue 4

573-583

EN

The knowledge about membrane contactors is growing rapidly but is still insufficient for a reliable designing. This paper presents a new type of membrane contactors that are integrated with one of the following ways of separation by using absorbents, micelles, flocculants, functionalized polymers, molecular imprints, or other methods that are based on aggregation. The article discusses methods for designing multi-stage cascade, usually counter-current. At every stage of this cascade, relevant aggregates are retained by the membrane, while the permeate passes freely through membrane. The process takes place in the membrane boundary layer with a local cross-flow of the permeate and the retentate. So the whole system can be called a cross-counter-current. The process kinetics, k, must be coordinated with the permeate flux, J, and the rate of surface renewal of the sorbent on the membrane surface, s. This can be done by using ordinary back-flushing or relevant hydrodynamic method of sweeping, such as: turbulences, shear stresses or lifting forces. A surface renewal model has been applied to adjust the optimal process conditions to sorbent kinetics. The experimental results confirmed the correctness of the model and its suitability for design of the new type of contactors.

2

On the three-phase mass transfer with solid particles adhered to the gas-liquid interface

100%

Nagy E.

Open Chemistry

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2003

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vol. 1

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issue 2

160-177

EN

A heterogeneous, multi-layer mass transfer model is proposed for prediction of the effect of multi-layer packing of catalyst particles adhered to the gas-liquid interface. The behavior of the mass transfer rate with respect to the multi-layer packing, to the particle size and mass transfer coefficient without particles is discussed. It is shown that enhancement can be considerably increased by multi-layer packing compared to that of mono-layer packing, depending on the values of particle size and mass transfer coefficient. The predicted mass transfer rates using the proposed model was verified with experimental data taken from the literature. The model presented should be superior to that of published in the literature.

3

Designing of Membrane Contactors with Cross-Counter Current Flow

86%

Kołtuniewicz A. B., Modelski S., Witek A.

Chemical and Process Engineering

|

2012

|

issue 4

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2 Chemical and Process Engineering

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2 Kołtuniewicz A. B.

2 Modelski S.

2 Witek A.

1 Nagy E.

Designing of Membrane Contactors with Cross-Counter Current Flow

On the three-phase mass transfer with solid particles adhered to the gas-liquid interface

Designing of Membrane Contactors with Cross-Counter Current Flow