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Title:Določanje topnosti in tališč derivatov imidazola v superkritičnem CO2 : magistrsko delo
Authors:ID Kovač, Neva (Author)
ID Knez Marevci, Maša (Mentor) More about this mentor... New window
ID Cör Andrejč, Darija (Comentor)
Files:.pdf MAG_Kovac_Neva_2025.pdf (3,46 MB)
MD5: 6BD7598264AB741F42BC74112426DC98
 
Language:Slovenian
Work type:Master's thesis/paper
Typology:2.09 - Master's Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:Magistrsko delo prikazuje študijo obnašanja treh derivatov imidazola (imidazola, benzimidazola in 2-metilimidazola) v superkritičnem ogljikovem dioksidu. Namen raziskave je določiti topnosti in tališča derivatov pri različnih tlakih in temperaturah ter oceniti vpliv strukturnih razlik med derivati na njihove fizikalno-kemijske lastnosti v superkritičnem mediju. Topnosti imidazola in benzimidazola so bile določene s statično-analitično metodo pri temperaturah 40 °C in 60 °C ter tlakih do 800 bar. Rezultati kažejo, da topnost obeh spojin z naraščajočim tlakom sprva narašča in doseže maksimum med 400 bar in 500 bar, nato pa se ponovno zmanjšuje. Pri imidazolu je topnost v celotnem območju tlakov višja pri 60 °C, kar potrjuje pozitiven vpliv temperature, medtem ko je pri benzimidazolu topnost višja pri 40 °C, kar nakazuje nasproten temperaturni učinek. Imidazol doseže največjo topnost 0,025 g/g CO2, benzimidazol pa le 0,0058 g/g CO2, kar kaže na izrazit vpliv molekulske strukture na raztapljanje v superkritičnem ogljikovem dioksidu. Tališča vseh treh derivatov so bila določena z modificirano kapilarno metodo. V vseh primerih se temperatura tališča z začetnim povečevanjem tlaka znižuje, nato pa pri višjih tlakih ponovno narašča. Najizrazitejši padec temperature taljenja je bil opažen pri 2-metilimidazolu (32,5 °C). Rezultati prispevajo k boljšemu razumevanju faznega obnašanja in medmolekulskih interakcij heterocikličnih spojin v superkritičnem ogljikovem dioksidu, kar je pomembno za načrtovanje procesov superkritične ekstrakcije, kristalizacije in sinteze materialov.
Keywords:imidazol, benzimidazol, 2-metilimidazol, superkritični ogljikov dioksid, topnost, tališče
Place of publishing:Maribor
Place of performance:Maribor
Publisher:[N. Kovač]
Year of publishing:2025
Number of pages:1 spletni vir (1 datoteka PDF (X, 35 str.))
PID:20.500.12556/DKUM-95918 New window
UDC:547.78-139(043.2)
COBISS.SI-ID:261108483 New window
Publication date in DKUM:24.11.2025
Views:150
Downloads:43
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FKKT
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Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:10.11.2025

Secondary language

Language:English
Title:Determination of solubility and melting intervals of imidazole derivates in supercritical CO2
Abstract:The master's thesis presents a study of the behaviour of three imidazole derivatives (imidazole, benzimidazole, and 2-methylimidazole) in supercritical carbon dioxide. The purpose of the research is to determine the solubility and melting points of the derivatives at different pressures and temperatures, and to assess the influence of structural differences between the derivatives on their physicochemical properties in a supercritical medium. The solubilities of imidazole and benzimidazole were determined using a static-analytical method at temperatures of 40 °C and 60 °C and pressures up to 800 bar. The results show that the solubility of both compounds initially increases with increasing pressure, reaching a maximum between 400 bar and 500 bar, and then decreases. For imidazole, solubility is higher at 60 °C across the entire pressure range, confirming the positive effect of temperature. In contrast, for benzimidazole, solubility is higher at 40 °C, indicating the opposite temperature effect. Imidazole reaches a maximum solubility of 0,025 g/g CO₂, while benzimidazole reaches only 0,0058 g/g CO₂, indicating a pronounced effect of molecular structure on dissolution in supercritical CO2. The melting points of all three derivatives were determined using a modified capillary method. In all cases, the melting temperature decreases with an initial increase in pressure, then increases again at higher pressures. The most pronounced decrease in melting temperature was observed for 2-methylimidazole (32,5 °C). The results contribute to a better understanding of the phase behaviour and intermolecular interactions of heterocyclic compounds in supercritical CO2, which is important for the design of supercritical extraction, crystallisation, and synthesis processes for materials.
Keywords:imidazole, benzimidazole, 2-methylimidazole, supercritical carbon dioxide, solubility, melting point


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