Usporedba strukturnih parametara i parametara stabilnosti sirovih nafti i njihovih teških frakcija

master's thesis

• Title (english): Correlation between structural and stability parameters of crude oils and their heavy fractions
• Author: Bruno Pinević
• Mentor: Predrag Novak (mentor)
• Mentor: Jelena Parlov Vuković (mentor)
• Committee member: Predrag Novak (predsjednik povjerenstva)
• Committee member: Josip Požar (član povjerenstva)
• Committee member: Ivan Kodrin (član povjerenstva)
• Committee member: Sanda Rončević (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Chemistry); Zagreb
• Defense date and country: 2020-02-26, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry

Abstract

Jedan od glavnih ciljeva naftne industrije u zadnjih desetak godina jest dobiti što precizniju sliku cjelokupnog sastava sirove nafte zbog unapređenja proizvodnog procesa. Riječ je o jednoj od najkompleksnijih smjesa spojeva koje nalazimo u prirodi a najveći problem stvaraju asfalteni – najsloženiji spojevi u nafti čija karakterizacija i danas predstavlja veliki izazov.
U ovom je radu, na temelju tri uzorka nafte različitog geografskog porijekla, analizirana mogućnost postojanja korelacije između parametara stabilnosti i udjela aromatskih vodika odnosno masenog udjela asfaltena te difuzijskih koeficijenata dobivenih analizom spektara DOSY NMR. Pored spektroskopije DOSY NMR korištena je i metoda za određivanje intrinzičnih parametara stabilnosti ASTM D 7157 kao i spektroskopija 1H NMR. Izmjereni difuzijski koeficijenti poslužili su za procjenu hidrodinamičkih radijusa te molekulskih masa.
Očekuje se da će dobiveni rezultati pridonijeti boljem razumijevanju parametara stabilnosti i procesa agregacije ovih spojeva.

Abstract (english)

One of the main goals of petroleum industry in the last decade has been to obtain accurate data on the overall composition of crude oil in order to improve refining process. Crude oil is one of the most complex mixture found in nature and the biggest problem of the production process is caused by asphaltenes – the most complex compounds in crude oil whose characterization is still a major challenge.
In this paper, a correlation between stability parameters of three crude oil samples of different geographical origin, its aromatic hydrogen content, and asphaltene molecular masses was determined using diffusion coefficients obtained from DOSY NMR spectra. In addition to NMR spectroscopy, ASTM D 7157 method was used to determine the intrinsic stability parameters. Hydrodynamic radii were estimated as well as molecular masses.
The results are expected to contribute to a better understanding of stability parameters and aggregation process of these compounds.

• Keywords: asfalteni; difuzijski koeficijent; DOSY NMR; flokulacija; metoda ASTM D 7157; nafta; parametri stabilnosti
• Keywords (english): asphaltenes; ASTM D 7157; crude oil; diffusion coefficient; DOSY NMR; flocculation; stability parameters
• Language: croatian
• URN:NBN: urn:nbn:hr:217:509922
• Study programme: Title: Graduate university studies in chemistry; specializations in: Research programme; Course: Research programme; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra kemije (magistar/magistra kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2020-06-18 13:02:56