Fizikalna karakterizacija sustava kapljevina-kapljevina

undergraduate thesis

• Title (english): Physical characterization of liquid-liquid systems
• Author: Ana Maria Ćosić
• Mentor: Aleksandra Sander (mentor)
• Committee member: Aleksandra Sander (predsjednik povjerenstva)
• Committee member: Krunoslav Žižek (član povjerenstva)
• Committee member: Marijana Kraljić Roković (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2022-09-13, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Sustavi nemješivih kapljevina odnosno emulzije tipa ulje-voda nalaze primjenu u brojnim industrijskim granama poput kemijske, petrokemijske i farmaceutske industrije. Poznavanje njihovog reološkog i hidrodinamičkog ponašanja, kao i njihova karakterizacija, od iznimne je važnosti. U ovom radu istražena su svojstva dvaju nemješivih sustava ulje-voda. Promatrane su emulzije maslinovog odnosno kukuruznog ulja i destilirane vode. Istraživanje je započelo fizikalnom karakterizacijom čistih ulja mjerenjem viskoznosti, gustoće, kiselinskog broja i površinske napetosti. Zatim je za dvofazne sustave s različitim udjelima vode određena snaga i brzina vrtnje miješala potrebna za uspostavu potpune disperzije. Istraženi su fenomeni pojave inverzija faza, promjena veličine kapljica disperzne faze s promjenom brzine vrtnje miješala, veličina kapljica disperzne faze tijekom stanja potpune disperzije te na kraju sklonost sustava koalescenciji odnosno vrijeme potrebno za razdvajanje faza nakon prestanka miješanja.

Abstract (english)

Immiscible liquid-liquid systems such as oil-water emulsions find application in numerous industrial branches, most commonly in the chemical, petrochemical and pharmaceutical industries. The characterization of such systems and the knowledge about their rheological and hydrodynamical behaviour is particularly important for their utilization. This work investigates the properties of two immiscible oil-water systems. The characterized systems consist of olive and corn oil mixed with distilled water. The investigation started with physical characterization of oils, by measuring viscosity, density, acid number and surface tension. It was followed by determination of the power and rotation speed of the stirrer required for the complete dispersion establishment in the oil-water systems. The investigated phenomena include phase inversion, the change in the size of the dispersed phase droplets with a change in the speed of the stirrer rotation, the size of the dispersed phase droplets during the state of complete dispersion and finally the tendency of the system to coalesce, i.e. the time required for the separation of the phases to occur after the mixing stopped.

• Keywords: nemješivi sustav kapljevina-kapljevina; sustav ulje-voda; disperzija kapljica; inverzija faza; koalescencija; karakterizacija ulja
• Keywords (english): immiscible liquid-liquid system; oil-water system; droplet dispersion; phase inversion; coalescence; oil characterization
• Language: croatian
• URN:NBN: urn:nbn:hr:149:846060
• Project: Number: KK.01.1.1.04.0070; Title: Razvoj sustava za ispitivanje višefaznih strujanja i izgaranja s ciljem povećanja istraživačkih aktivnosti znanstvenog i poslovnog sektora; Acronym: RESIN; Leader: Milan Vujanović; Jurisdiction: Croatia; Funder: MRRFEU; Funding stream: Nema
• Study programme: Title: Applied Chemistry - Undergraduate study; specializations in: Environmental chemistry and green technologies, Advanced materials and technologies, Applied organic chemistry; Course: Environmental chemistry and green technologies; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) primijenjene kemije (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) primijenjene kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-02-21 08:47:39