Eksperimentalno određivanje i modeliranje ravnoteže para-kapljevina u sustavu cikloheksan(1) - izopropanol(2)

undergraduate thesis

• Title (english): Experimental determination and modeling of vapor-liquid equilibria in the cyclohexane(1) - isopropanol(2) system
• Author: Hana Perinić
• Mentor: Marko Rogošić (mentor)
• Committee member: Marko Rogošić (predsjednik povjerenstva)
• Committee member: Aleksandra Sander (član povjerenstva)
• Committee member: Kristina Zagajski Kučan (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2022-09-20, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Fazna ravnoteža para–kapljevina u sustavu cikloheksan (1) – izopropanol (2) odredila se pri atmosferskom tlaku primjenom Hunsmannove aparature. Iz dobivenog dijagrama vrenja vidljivo je da je riječ o azeotropnom sustavu s minimumom vrelišta. Za usporedbu eksperimentalnih i literaturnih podataka izabran je skup literaturnih podataka koji pripada trećem razredu termodinamičke konzistentnosti prema Van Nessovu testu. Usporedbom se uočava odstupanje: udio cikloheksana u kapljevitoj fazi pri udjelima cikloheksana manjim od azeotropnog i udio cikloheksana u parnoj fazi pri udjelima cikloheksana većim od azeotropnog veći je kod eksperimentalnih podataka, a azeotropna točka postiže se pri nižim udjelima cikloheksana kod literaturnih podataka. Provedeno je određivanje temperaturno ovisnih parametara modela Wilson, NRTL i UNIQUAC za literaturne podatke, a vrijednost parametra neslučajnosti kod modela NRTL fiksirana je na α12 = 0,3. Najprikladniji model za opis podataka određuje se na temelju funkcije cilja čija je vrijednost najniža za Wilsonov model. Proveden je proračun jednokratnog isparavanja pri konstantnom tlaku i temperaturi kako bi se usporedili eksperimentalni podaci s modelima Wilson, NRTL i UNIQUAC. Parametri modela UNIQUAC zbog osjetljivosti modela nisu primjenjivi za skup eksperimentalnih podataka predstavljen u ovom radu.

Abstract (english)

The vapor-liquid equilibrium in the cyclohexane (1) – isopropanol (2) system was determined at atmospheric pressure using the Hunsmann's apparatus. According to the resulting boiling point diagram, the system is an azeotrope with a minimum boiling point. A set of literature data belonging to the third class of thermodynamic consistency according to the Van Ness test was chosen for a comparison with experimental data. The comparison shows a deviation: the molar fraction of cyclohexane in the liquid phase at cyclohexane contents lower than the azeotropic one and the molar fraction of cyclohexane in the vapor phase cyclohexane contents higher than the azeotropic one are higher for experimental data, whereas the azeotropic point is reached at lower mole fraction of cyclohexane for literature data. The temperature-dependent parameters of the Wilson, NRTL and UNIQUAC models were determined for literature data, and the non-randomness parameter value of the NRTL model was fixed at α12= 0,3. The most suitable model to describe data is determined based on the objective function whose value is the lowest for the Wilson model. An isothermal flash calculation was performed to compare the experimental data with the Wilson, NRTL, and UNIQUAC models. Due to model’s sensitivity, the parameters of the UNIQUAC model are not applicable for the set of experimental data presented in this paper.

• Keywords: ravnoteža para-kapljevina; cikloheksan; izopropanol; Wilsonov model; NRTL; UNIQUAC; jednokratno isparavanje
• Keywords (english): vapor-liquid equilibrium; cyclohexane; isopropanol; Wilson model; NRTL; UNIQUAC; isothermal flash
• Language: croatian
• URN:NBN: urn:nbn:hr:149:038900
• 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: 2023-03-13 07:57:51