Membrane reactors with immobilized enzymes or cells call for an accurate description of mass transport across the membrane itself. Despite the different geometries involved (hollow fibers bundles, single or multiple membranes in one pass or multipass arrangements, granular catalytic bed enclosed within inert membranes, etc.), the mass transport always occurs through several bulk solutions, unstirred layers and membrane matrices disposed one after another. It follows that the properties of series arrays of elementary diffusional barriers have to be investigated. This has been done using the tools of linear thermodynamics of irreversible processes which, despite its name, can give an accurate description of non-linear transport phenomena driven by several different generalized forces, including hydrostatic and osmotic pressure differences, temperature gradients and electric fields. The present model, whose behaviour can be simulated using an ad hoc computer program describes the transport of water and non-electrolytes across up to 10 homogeneous diffusional barriers. Non-homogeneous barriers can be treated as series arrays of thinner homogeneous barriers. The non-linear volume and solute flows mimick the behaviour of the ones observed in complex biological membranes and it has been shown that the asymmetry of the array and the presence of selective membranes are required for its non-linear behaviour.

Membrane models for membrane reactors / F.C. Celentano, G. Monticelli. ((Intervento presentato al 4. convegno Separation Science and Biotechnology tenutosi a Gargnano del Garda nel 1988.

Membrane models for membrane reactors

G. Monticelli
Ultimo
1988-09-01

Abstract

Membrane reactors with immobilized enzymes or cells call for an accurate description of mass transport across the membrane itself. Despite the different geometries involved (hollow fibers bundles, single or multiple membranes in one pass or multipass arrangements, granular catalytic bed enclosed within inert membranes, etc.), the mass transport always occurs through several bulk solutions, unstirred layers and membrane matrices disposed one after another. It follows that the properties of series arrays of elementary diffusional barriers have to be investigated. This has been done using the tools of linear thermodynamics of irreversible processes which, despite its name, can give an accurate description of non-linear transport phenomena driven by several different generalized forces, including hydrostatic and osmotic pressure differences, temperature gradients and electric fields. The present model, whose behaviour can be simulated using an ad hoc computer program describes the transport of water and non-electrolytes across up to 10 homogeneous diffusional barriers. Non-homogeneous barriers can be treated as series arrays of thinner homogeneous barriers. The non-linear volume and solute flows mimick the behaviour of the ones observed in complex biological membranes and it has been shown that the asymmetry of the array and the presence of selective membranes are required for its non-linear behaviour.
irreversible processes ; linear thermodynamics ; mass transport ; membrane model ; membrane reactor ; non-electrolyte transport ; non-linear transport ; selective membrane ; water flow
Settore BIO/09 - Fisiologia
Università degli Studi di Milano
Consiglio Nazionale delle Ricerche
Membrane models for membrane reactors / F.C. Celentano, G. Monticelli. ((Intervento presentato al 4. convegno Separation Science and Biotechnology tenutosi a Gargnano del Garda nel 1988.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/219237
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