Priprema i karakterizacija prirodnih niskotemperaturnih eutektičkih otapala

undergraduate thesis

• Title (english): Natural deep eutectic solvent preparation and characterization
• Author: Lara Krmelić
• Mentor: Jasna Prlić Kardum (mentor)
• Committee member: Jasna Prlić Kardum (predsjednik povjerenstva)
• Committee member: Aleksandra Sander (član povjerenstva)
• Committee member: Dajana Kučić Grgić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2024-07-12, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Niskotemperaturna eutektička otapala pojavila su se prije sedamnaest godina u području zelene kemije te se intenzivno proučavaju kao ekološki prihvatljiva zamjena za štetna organska otapala. Smatraju se posebnom vrstom zelenih otapala zbog visoke topljivosti, niskih troškova te jednostavne metode pripreme i sinteze. Nastaju kombinacijom dvaju spoja: akceptora vodikove veze (HBA) i donora vodikove veze (HBD). Struktura i fizikalno-kemijska svojstva tih otapala mogu se dizajnirati za specifičnu primjenu. U ovom radu su pripremljena otapala koja se temelje na kolin kloridu i prirodnim organskim kiselinama. Provedena je fizikalno-kemijska karakterizacija pripremljenih DES-ova. Izmjerene su vrijednosti gustoće, viskoznosti te kiselost. Pratio se utjecaj promjene komponente koja je donor vodikove veze te dodatak masenog udjela vode na fizikalno-kemijska svojstava DESova. FTIR analizom je potvrđen nastanak strukture DES-a. Svi pripravljeni DES-ovi su kapljevine, izrazito kisele i visoke viskoznosti te se ponašaju kao Newtonovi fluidi. Gustoća im se kreće u rasponu od 1,18 do 1,33 g/cm^3. FTIR analizom dobiveni su pikovi karakteristični za DES-ove.

Abstract (english)

In the field of green chemistry, deep eutectic solvents first emerged seventeen years ago, and researchers are actively studying them as an environmentally friendly replacement for hazardous organic solvents.They are considered as a special type of green solvents due to their high solubility, low costs and simple methods of preparation and synthesis. They are formed by the combination of two compounds: a hydrogen bond acceptor (HBA) and a hydrogen bond donor (HBD). The structure and physicochemical properties of these solvents can be designed for a specific application. In this work, solvents were prepared based on choline chloride and natural organic acids. Physicochemical characterization was made for prepared DESs. Density, viscosity and acidity values were measured. The influence of the hydrogen bond donor component and adding a mass proportion of water on the physicochemical properties of DESs were investigated. FTIR research confirmed the formation of the DES structure. All DES are liquids, very acidic, highly viscous, and behave like Newtonian fluids. Their density changes between 1.18 and 1.33 g/cm^3. The FTIR investigation identified DES-specific peaks.

• Keywords: niskotemperaturno eutektičko otapalo; kolin klorid; fizikalno-kemijska karakterizacija
• Keywords (english): deep eutectic solvents; choline chloride; physicochemical characterization
• Language: croatian
• URN:NBN: urn:nbn:hr:149:677491
• Study programme: Title: Chemical Engineering - Undergraduate study; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-07-19 14:04:16