Poboljšanje efikasnosti oksidacijske desulfurizacije korištenjem dodekafosfovolframove kiseline

undergraduate thesis

• Title (english): Enhance activity of oxidative desulfurization with phosphotungstic acid
• Author: Denija Krivičić
• Mentor: Katica Sertić-Bionda (mentor)
• Committee member: Katica Sertić-Bionda (predsjednik povjerenstva)
• Committee member: Sanja Papić (član povjerenstva)
• Committee member: Aleksandra Sander (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2015-09-07, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering; Reaction Engineering

Abstract

Naftni proizvodi općenito u današnje vrijeme imaju široku primjenu te se najvećim dijelom koriste kao goriva za motore s unutarnjim izgaranjem pri čemu se u atmosferu oslobađaju štetni sumporovi (SOx) i dušikovi oksidi (NOx). Stoga zahtjevi naftne prerađivačke industrije podliježu strožim ekološkim propisima u svrhu zaštite ljudskog zdravlja i okoliša. Kako bi se smanjio udio sumpora, frakcije nafta najčešće se obrađuju hidrodesulfurizacijskim (HDS) procesom. Kako bi se zadovoljile propisane regulative HDS proces iziskuje visoki radni tlak i temperaturu te ne pokazuje dostatnu uspješnost pri uklanjanju tiofenskih spojeva koji se nalaze u dizelskom gorivu. Iz tog razloga razvijaju se alternativne metode uklanjanja sumporovih spojeva kao što su adsorpcijski, ekstrakcijski, oksidacijski i drugi procesi. Ultrazvukom potpomognuta oksidacijska desulfurizacija (UAOD) predstavlja poboljšanje razvijeno na klasičnom procesu oksidacijske desulfurizacije i proces je koji u današnje vrijeme sve više dobiva na pozornosti jer za razliku od ostalih alternativnih procesa desulfurizacije pokazuje najbolju učinkovitost pri blagim reakcijskim uvjetima. U ovom radu proučavan je utjecaj temperature reakcije, snage ultrazvuka, mase katalizatora i vremena oksidacije na proces ultrazvukom potpomognute oksidacijske desulfurizacije (UAOD) modelne otopine dizelskog goriva. U heterogenom sustavu nalazi se vodikov peroksid, koji ima ulogu oksidacijskog sredstva, dodekafosfovolframova kiselina koja katalizira reakciju oksidacije te tetraoktil amonijev bromid čija je svrha smanjiti međufaznu površinu. Ispitivanje je provedeno promjenom temperature od 40-70°C, amplitude ultrazvuka od 50-80% snage 70 W i mase katalizatora od 0,1-0,2 g u vremenu od 0-40 minuta. Analiza sumporovih spojeva nakon procesa ultrazvukom potpomognute oksidacijske desulfurizacije provedena je metodom plinske kromatografije.

Abstract (english)

Petroleum and its derivatives today have a broad application, and most of the use of petroleum as fuels for engines for internal combustion therefore by combustion of petroleum harmful sulfur (SOx) and nitrogen oxides (NOx) are released into the atmosphere. Therefore requirements of petroleum manufacturing industry are subject to stringent environmental regulations for the protection of human health and the environment. In order to reduce the sulfur content, petroleum fractions are usually processed with the hydrodesulfurization (HDS) process. Besides, to meet the requirements HDS process requires a high working pressure and high temperature, but it does not show succesfull removing of tiophene compounds contained in diesel fuel. For this reason developing alternative methods of removing sulfur compounds such as adsorption, extraction, oxidation and many other processes. Ultrasound assisted oxidative desulfurization (UAOD), developed to improve the conventional process of oxidative desulfurization, the process which today adds the most attention among other alternative processes because it shows better efficiency under mild reaction conditions. In this paper effects of reaction temperature, ultrasound power, mass of catalyst and time of the oxidation process with ultrasound assisted oxidative desulfurization (UAOD) model solution dibenzothiophene (DBT) were investigated. In the system of the hydrogen peroxide, which acts as an oxidizing agent, phosphotungstic acid that catalyzes this process tetraoctylammonium bromide whose purpose obviously reduce the interfacial area. The test is performed at an interval of 40-70°C, interval ultrasound power 70 W 50-80%, mass of catalyst 0,1-0,2 g and time periode from 0-40 minutes. Gas chromatography method was used for identification of sulfur containing compounds formed during the oxidative dusulfurization process.

• Keywords: oksidacijska desulfurizacija; ultrazvukom potpomognuta oksidacijska desulfurizacija; dibenzotiofen; dodekafosfovolframova kiselina; tetraoktil amonijev bromid
• Keywords (english): oxidative desulfurization; ultrasound assisted oxidative desulfurization; dibenzotiophen; phosphotungstic acid; tetraoctylammonium bromide
• Language: croatian
• URN:NBN: urn:nbn:hr:149:297472
• Study programme: Title: Environmental Engineering - Undergraduate study; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka ekoinženjerstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka ekoinženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Repository: Repository of Faculty of Chemical Engineering and Technology University of Zagreb
• Created on: 2016-09-26 13:38:03