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

Result code in 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>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

CI - Industrial chemistry and chemical engineering

OECD FORD branch

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Project

<a href="/en/project/GA15-21715S" target="_blank" >GA15-21715S: Gas-liquid mass transfer experimental study in presence of solid particles and in viscous liquids</a><br>

Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2016

Confidentiality

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

Article name in the collection

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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Number of pages

16

Pages from-to

305-320

Publisher name

Slovak Society of Chemical Engineering

Place of publication

Bratislava

Event location

Tatranské Matliare

Event date

May 23, 2016

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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