Gas-Liquid-Solid volumetric mass transfer coefficient for industrial vessel design

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F18%3A43916782" target="_blank" >RIV/60461373:22340/18:43916782 - 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

Gas-Liquid-Solid volumetric mass transfer coefficient for industrial vessel design

Original language description

Waste-water treatment, fermentation, chlorination/de-chlorination and hydrogenation are processes often realized in mechanically agitated vessels. In many cases the gas-liquid mass transfer can be the limiting process in the utilization of mechanically agitated vessels. The parameter describing gas-liquid mass transfer intensity (volumetric mass transfer coefficient kLa) becomes than the key parameter. Because in fermentation processes as well as in hydrogenation ones solid particles are usually also present in gas-liquid system, we aim to study experimentally the effect of solid particles presence on kLa values using reliable measuring methods. Measurements were conducted in a three phase multiple-impeller fermenter of i.d. 29 cm containing microparticles of the diameter 137 ±30 μm (see Figure 1). To cover the effect of impeller type in our results, we gradually used Rushton turbine, Pitched-blade pumping down and Techmix pumping down impellers of the diameter of 1/3 of the vessel diameter. To measure kLa using dissolved oxygen (DO) polarographic probes the Dynamic pressure method (DPM) has been chosen. We present our results in the form of dependencies of kLa on process parameters as impeller power, gas superficial velocity, impeller blade speed, etc. We used several mathematical shapes of the dependencies to find which ones will describe the kLa dependency accurately well, to be used in agitated vessels industrial design, when gas-liquid-solid system should be treated. Usually, kLa correlations are based on gassed power input and superficial gas velocity. We tested several correlation types, evaluated their empirical parameters and proposed the correlation shapes suitable for fermenter design, operating and scale-up under the conditions, where solid particles affect the interfacial mass transfer.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20401 - Chemical engineering (plants, products)

Project

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Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2018

Confidentiality

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

Article name in the collection

Proceedings of 45th International Conference of Slovak Society of Chemical Engineering

ISBN

978-80-89597-89-5

ISSN

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e-ISSN

neuvedeno

Number of pages

16

Pages from-to

167-182

Publisher name

Slovak Society of Chemical Engineering

Place of publication

Bratislava

Event location

Tatranské Matriare

Event date

May 21, 2018

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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