Analiza efektivne difuzivnosti komponenata oscilirajućih reakcija u mikroreaktoru

master's thesis

• Title (english): Analyis of the effective diffusivity of the oscillating rections components in a microreactor
• Author: Martina Šafranko
• Mentor: Mirjana Čurlin (mentor)
• Granter: University of Zagreb; Faculty of Food Technology and Biotechnology; (Department of Process Engineering); (Section for Fundamental Engineering); Zagreb
• Defense date and country: 2016-09-30, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Biotechnology

Abstract

Efektivna difuzivnost komponenata oscilirajućih reakcija (kalijev jodat, malonska kiselina, škrob, vodikov peroksid, manganov sulfat, sulfatna kiselina, kalijev bromat i kalijev bromid) analizirana je u mikroreaktoru s glatkim stijenkama. Provedeni su eksperimenti za različite protoke faza od q = 2-400 µL min-1 u mikroreaktoru s 2 ulaza i 2 izlaza ukupnog volumena V = 4 µL. Određeni su profili koncentracija pojedine komponente u obje faze pri različitim vremenima zadržavanja. Na osnovi literaturnih podataka o vrijednosti koeficijenata efektivne difuzivnosti pojedine komponente, primjenom aproksimativne metode s dva idealna cijevna reaktora, provedena je simulacija 2D matematičkog modela prijenosa tvari u mikroreaktoru. Iz rezultata je vidljivo da se trend promjene koncentracije može opisati odabranim modelom uz odstupanja pri malim vremenima zadržavanja. S obzirom da su izračunata difuzijska vremena za mikroreaktorski sustav kraća za tri reda veličine u odnosu na klasični makroskopski sustav može se zaključiti da su ovi sustavi pogodniji za provedbu i bolju kontrolu oscilirajućih rerakcija.

Abstract (english)

Effective diffusivity of the oscillating reaction components (potassium iodate, malonic acid, starch, hydrogen peroxide, magnesium sulphate, sulphuric acid, potassium bromate, potassium bromide ) was analysed in a microreactor with no surface roughness. Experiment were performed at the flow rates for q = 2-400 µL min-1 using microreactor equipped with 2 Y-shaped inflows and 2 Y-shaped outflows with total working volume of V = 4 µL. Concentration profiles for both phases were obtained at different residence times. Using literature available data on effective diffusivity of the analysed components and applying approximatively method based on two ideal plug flow reactors, mathematical 2D model for the descriptions of the mass transfer in a microreactor was simulated. Results show that selected model describes the experimental data very well with small dispersion at low residence times. Calculated values of the diffusion times show that diffusion process is three fold faster in a microreactor comparing to classical macroreactor and based on that it can be concluded that microreactors are more suitable for performing and controlling oscillating reactions.

• Keywords: Efektivna difuzivnost; mikroreaktor; oscilirajuća reakcija; matematički model
• Keywords (english): Effective diffusivity; microreactor; oscillating reation; mathematical model
• Language: croatian
• URN:NBN: urn:nbn:hr:159:807755
• 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: Open access
• Created on: 2017-04-25 10:49:09