Interakcije vode z ionskimi tekočinami

Goste, Domen (author), Bešter-Rogač, Marija (mentor)

V okviru magistrske naloge sem pripravil šest 1-alkil-3-metilimidazolijevih ionskih tekočin s karboksilatnimi protiioni s postopkom izmenjave aniona. V čiste ionske tekočine sem titriral vodo v dodatkih po 5 µL ter meril toplotni efekt z metodo izotermne titracijske kalorimetrije (ITC). Dobljen toplotni tok sem integriral, da sem dobil spremembo entalpije pri posameznem dodatku, eksperimentalne rezultate pa sem nato preračunal v entalpije mešanja vode z ionsko tekočino. Za vse preiskovane spojine so bile te negativne v celotnem koncentracijskem območju, globina minimuma pa se je manjšala z daljšanjem alkilne verige karboksilatnih anionov. V končnem delu naloge sem sistem 1-heksil-3-metilimidazolijev heksanoat/voda poskušal simulirati tudi z metodo PCSAFT.

• Language: Slovenian
• Keywords: ionske tekočine, karboksilati, ITC, entalpija mešanja, PC-SAFT
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FKKT - Faculty of Chemistry and Chemical Technology
• Year: 2023
• PID: 20.500.12556/RUL-150066
• COBISS.SI-ID: 171714819
• Publication date in RUL: 13.09.2023

Secondary language

• Language: English
• Title: Interactions of water with ionic liquids

Abstract

As part of my master’s thesis, I first prepared six 1-alkyl-3-methylimidazolium ionic liquids with carboxylate counterions by anion exchange. Water was then titrated into each pure ionic liquid in 5 µL aliquots, while the heat flux was measured by isothermal titration calorimetry (ITC) and integrated over time to obtain the enthalpy change due to the addition of water. The enthalpies of mixing of the ionic liquids with water were calculated based on the experimental results. All ionic liquids have negative enthalpies of mixing over the entire concentration range, although the depth of their minima was shallower for the compounds containing anions with longer alkyl chains. In the last part of my thesis, I attempted to simulate the 1-hexyl-3-methylimidazolium hexanoate/water system using PC-SAFT.

• Keywords: ionic liquids, carboxylates, ITC, enthalpy of mixing, PC-SAFT