Regresijski model segmentiranog strujanja u sastavu voda - organsko otapalo u mikroreaktoru

master's thesis

• Title (english): Regression model on slug flow in water - organic solvent system in a microreactor
• Author: Iva Anić
• Mentor: Želimir Kurtanjek (mentor)
• Granter: University of Zagreb; Faculty of Food Technology and Biotechnology; (Department of Process Engineering); (Laboratory for Measurement, Regulation and Automatisation); Zagreb
• Defense date and country: 2011-07-12, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Biotechnology

Abstract

Kemijski i biokemijski procesi mogu se znatno pospješiti provedbom u mikroreaktorima. Poznato je da sustavi voda-organsko otapalo stvaraju segmentirani tok unutar mikrokanala, te su u takvim sustavima zbog nastanka unutarnjih cirkulacija, uzrokovanih trenjem između kontinuirane faze/stijenke mikrokanala i površine segmenta, povećani konvektivni prijenos i brzina reakcije. Međutim, hidrodinamika u tim sustavima nije u potpunosti razjašnjena. Cilj ovog rada bio je utvrditi opseg režima segmentiranog strujanja u sustavu nekoliko organskih otapala s vodom, istražiti ovisnost duljine nastalih segmenata u sustavu o prosječnoj linearnoj brzini strujanja uzimajući u obzir fizikalno-kemijske karakteristike organskih otapala i vode te naposljetku razviti regresijski model na osnovi dobivenih eksperimentalnih rezultata. U staklenom mikroreaktoru širine mikrokanala 150 μm eksperimentima neutralizacije octene kiseline s NaOH pri prijelazu octene kiseline iz organske faze (heksan) u vodenu fazu određen je volumni koeficijent međufaznog prijenosa tvari.

Abstract (english)

Intensification of chemical and biochemical processes can be done in microreactor systems. Segmented flow can be generated in water-organic solvent systems. Because of internal circulations caused by friction among continuous phase/wall of microreactor and the surface of phase segment, mass transfer by convection and conversion rate are much higher. But still, hydrodinamics of these systems is not known yet. The aim of this work was to define the scope of the segment flow regimes in a system of several organic solvents and water, to explore how slug length in these systems depends on linear velocity, taken in cosideration their physical and chemical properties and in the end making a regression model on the basis of experimental data. Volume coefficient of mass transfer has been determined in glass microreactor with capillary width 150 μm by carrying out the neutralization experiment with NaOH where acetic acid diffuses from organic phase (hexane) into water phase.

• Keywords: mikroreaktor; segmentirano strujanje; koeficijent prijenosa tvari; regresijski model
• Keywords (english): microreactor; slug flow; mass transfer coefficient; regression model
• Language: croatian
• URN:NBN: urn:nbn:hr:159:588955
• Study programme: Title: Bioprocess Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka bioprocesnog inženjerstva (magistar/magistra inženjer/inženjerka bioprocesnog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2017-06-01 08:29:25