PhanerochaeteV1, Main, Exploration, bibRecord, 000213

Effectiveness Factors and Conversion in a Biocatalytic Membrane Reactor.

Identifieur interne : 000213 ( Main/Exploration ); précédent : 000212; suivant : 000214

Effectiveness Factors and Conversion in a Biocatalytic Membrane Reactor.

Auteurs : Buntu Godongwana [Afrique du Sud]

Source :

PloS one [ 1932-6203 ] ; 2016.

RBID : pubmed:27104954

Descripteurs français

KwdFr :
- Biocatalyse (MeSH), Bioréacteurs (MeSH), Cinétique (MeSH), Membrane artificielle (MeSH), Modèles théoriques (MeSH).
MESH :
- Biocatalyse, Bioréacteurs, Cinétique, Membrane artificielle, Modèles théoriques.

English descriptors

KwdEn :
- Biocatalysis (MeSH), Bioreactors (MeSH), Kinetics (MeSH), Membranes, Artificial (MeSH), Models, Theoretical (MeSH).
MESH :
- chemical : Membranes, Artificial.
- Biocatalysis, Bioreactors, Kinetics, Models, Theoretical.

Abstract

Analytical expressions of the effectiveness factor of a biocatalytic membrane reactor, and its asymptote as the Thiele modulus becomes large, are presented. The evaluation of the effectiveness factor is based on the solution of the governing equations for solute transport in the two regions of the reactor, i.e. the lumen and the matrix (with the biofilm immobilized in the matrix). The lumen solution accounts for both axial diffusion and radial convective flow, while the matrix solution is based on Robin-type boundary conditions. The effectiveness factor is shown to be a function of the Thiele modulus, the partition coefficient, the Sherwood number, the Peclet number, and membrane thickness. Three regions of Thiele moduli are defined in the effectiveness factor graphs. These correspond with reaction rate limited, internal-diffusion limited, and external mass transfer limited solute transport. Radial convective flows were shown to only improve the effectiveness factor in the region of internal diffusion limitation. The assumption of first order kinetics is shown to be applicable only in the Thiele modulus regions of internal and external mass transfer limitation. An iteration scheme is also presented for estimating the effectiveness factor when the solute fractional conversion is known. The model is validated with experimental data from a membrane gradostat reactor immobilised with Phanerochaete chrysosporium for the production of lignin and manganese peroxidases. The developed model and experimental data allow for the determination of the Thiele modulus at which the effectiveness factor and fractional conversion are optimal.

DOI: 10.1371/journal.pone.0153000
PubMed: 27104954
PubMed Central: PMC4841543

Affiliations:

Afrique du Sud

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Le document en format XML

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<front><div type="abstract" xml:lang="en">Analytical expressions of the effectiveness factor of a biocatalytic membrane reactor, and its asymptote as the Thiele modulus becomes large, are presented. The evaluation of the effectiveness factor is based on the solution of the governing equations for solute transport in the two regions of the reactor, i.e. the lumen and the matrix (with the biofilm immobilized in the matrix). The lumen solution accounts for both axial diffusion and radial convective flow, while the matrix solution is based on Robin-type boundary conditions. The effectiveness factor is shown to be a function of the Thiele modulus, the partition coefficient, the Sherwood number, the Peclet number, and membrane thickness. Three regions of Thiele moduli are defined in the effectiveness factor graphs. These correspond with reaction rate limited, internal-diffusion limited, and external mass transfer limited solute transport. Radial convective flows were shown to only improve the effectiveness factor in the region of internal diffusion limitation. The assumption of first order kinetics is shown to be applicable only in the Thiele modulus regions of internal and external mass transfer limitation. An iteration scheme is also presented for estimating the effectiveness factor when the solute fractional conversion is known. The model is validated with experimental data from a membrane gradostat reactor immobilised with Phanerochaete chrysosporium for the production of lignin and manganese peroxidases. The developed model and experimental data allow for the determination of the Thiele modulus at which the effectiveness factor and fractional conversion are optimal.</div>
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<Abstract><AbstractText>Analytical expressions of the effectiveness factor of a biocatalytic membrane reactor, and its asymptote as the Thiele modulus becomes large, are presented. The evaluation of the effectiveness factor is based on the solution of the governing equations for solute transport in the two regions of the reactor, i.e. the lumen and the matrix (with the biofilm immobilized in the matrix). The lumen solution accounts for both axial diffusion and radial convective flow, while the matrix solution is based on Robin-type boundary conditions. The effectiveness factor is shown to be a function of the Thiele modulus, the partition coefficient, the Sherwood number, the Peclet number, and membrane thickness. Three regions of Thiele moduli are defined in the effectiveness factor graphs. These correspond with reaction rate limited, internal-diffusion limited, and external mass transfer limited solute transport. Radial convective flows were shown to only improve the effectiveness factor in the region of internal diffusion limitation. The assumption of first order kinetics is shown to be applicable only in the Thiele modulus regions of internal and external mass transfer limitation. An iteration scheme is also presented for estimating the effectiveness factor when the solute fractional conversion is known. The model is validated with experimental data from a membrane gradostat reactor immobilised with Phanerochaete chrysosporium for the production of lignin and manganese peroxidases. The developed model and experimental data allow for the determination of the Thiele modulus at which the effectiveness factor and fractional conversion are optimal.</AbstractText>
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<ReferenceList><Reference><Citation>Adv Biochem Eng Biotechnol. 1991;44:27-64</Citation>
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</Reference>
<Reference><Citation>Biotechnol Bioeng. 1990 Apr 5;35(8):837-42</Citation>
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<Reference><Citation>Biotechnol Prog. 1992 Sep-Oct;8(5):462-4</Citation>
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<ArticleIdList><ArticleId IdType="pubmed">16687233</ArticleId>
</ArticleIdList>
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</ReferenceList>
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Effectiveness Factors and Conversion in a Biocatalytic Membrane Reactor.

Effectiveness Factors and Conversion in a Biocatalytic Membrane Reactor.

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri

Pour générer des pages wiki