Experimental study on volumetric mass transfer coefficient in viscous liquid in mechanically agitated fermenters.

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F16%3A43902502" target="_blank" >RIV/60461373:22340/16:43902502 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Experimental study on volumetric mass transfer coefficient in viscous liquid in mechanically agitated fermenters.

Popis výsledku v původním jazyce

In the industrial fermentation processes, most liquids are non-coalescent ones, which often exhibit increased viscosity. However, due to the limitations of most measurement methods, there is a lack of reliable data for predicting volumetric mass transfer coefficients (kLa) for non-coalescent viscous batches, especially under high dissipated energies. Our goal is to supply accurate kLa data measured using reliable experimental technique-Dynamic Pressure Method (DPM). This method was modified for the measurement in viscous liquids. Dissolved oxygen (DO) probes were placed in bypass measuring cells. This set up brings well defined transient characteristics of DO probes, which is crucial to evaluate correct kLas. Measurements were conducted in two multiple-impeller fermenters of laboratory (30 cm inner diameter, T30) and pilot (60 cm, T60) scale with a non-coalescent viscous Newtonian batch under a wide range of experimental conditions. Two types of DO probes (polarographic and optical) were used for measurements. The improved set up of the DPM enabled using optical DO probes. It was confirmed that optical DO probes can be used for kLa values up to 0.4 s-1. Based on the experimental data, reliable correlations were developed to predict kLa in industrial fermenters. Classic correlation, based on gassed power input Pg and superficial gas velocity vs, has low standard deviation but it is seen on the data from different vessel sizes that the correlation is scale specific. When the term of impeller tip speed (ND) is used instead of Pg, predicted data do not exhibit neither over-nor under-estimation of kLa for particular apparatus scale, so the correlation is not scale specific and can be used for fairly accurate design of industrial fermenters or for the optimization of their performance under a wide range of operational conditions.

Název v anglickém jazyce

Experimental study on volumetric mass transfer coefficient in viscous liquid in mechanically agitated fermenters.

Popis výsledku anglicky

In the industrial fermentation processes, most liquids are non-coalescent ones, which often exhibit increased viscosity. However, due to the limitations of most measurement methods, there is a lack of reliable data for predicting volumetric mass transfer coefficients (kLa) for non-coalescent viscous batches, especially under high dissipated energies. Our goal is to supply accurate kLa data measured using reliable experimental technique-Dynamic Pressure Method (DPM). This method was modified for the measurement in viscous liquids. Dissolved oxygen (DO) probes were placed in bypass measuring cells. This set up brings well defined transient characteristics of DO probes, which is crucial to evaluate correct kLas. Measurements were conducted in two multiple-impeller fermenters of laboratory (30 cm inner diameter, T30) and pilot (60 cm, T60) scale with a non-coalescent viscous Newtonian batch under a wide range of experimental conditions. Two types of DO probes (polarographic and optical) were used for measurements. The improved set up of the DPM enabled using optical DO probes. It was confirmed that optical DO probes can be used for kLa values up to 0.4 s-1. Based on the experimental data, reliable correlations were developed to predict kLa in industrial fermenters. Classic correlation, based on gassed power input Pg and superficial gas velocity vs, has low standard deviation but it is seen on the data from different vessel sizes that the correlation is scale specific. When the term of impeller tip speed (ND) is used instead of Pg, predicted data do not exhibit neither over-nor under-estimation of kLa for particular apparatus scale, so the correlation is not scale specific and can be used for fairly accurate design of industrial fermenters or for the optimization of their performance under a wide range of operational conditions.

Druh

D - Stať ve sborníku

CEP obor

CI - Průmyslová chemie a chemické inženýrství

OECD FORD obor

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Projekt

<a href="/cs/project/GA15-21715S" target="_blank" >GA15-21715S: Experimentální studie přenosu hmoty kapalina-plyn za přítomnosti pevných částis a ve viskózní vsádce</a><br>

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Proceedings 43rd International Conference of the Slovak Society of Chemical Engineering

ISBN

978-80-89597-35-2

ISSN

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e-ISSN

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Počet stran výsledku

16

Strana od-do

305-320

Název nakladatele

Slovak Society of Chemical Engineering

Místo vydání

Bratislava

Místo konání akce

Tatranské Matliare

Datum konání akce

23. 5. 2016

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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