In situ transesterifikacija taloga kave

undergraduate thesis

• Title (english): In situ transesterification of waste coffee grounds
• Author: Nina Carek
• Mentor: Aleksandra Sander (mentor)
• Committee member: Aleksandra Sander (predsjednik povjerenstva)
• Committee member: Krunoslav Žižek (član povjerenstva)
• Committee member: Juraj Šipušić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2020-09-22, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Ozbiljna briga za okoliš vezana uz korištenje goriva fosilnog podrijetla podigla je svijest o potrebi za alternativnim čistim gorivima. Biodizelsko gorivo smatra se čistom, biorazgradivom i netoksičnom alternativom za dizelsko gorivo. Obzirom na veliku globalnu proizvodnju i potrošnju kave, otpad od kave predstavlja potencijalnu nejestivu sirovinu za proizvodnju biodizela zbog visokog udjela ulja te dostupnosti u cijelom svijetu. U ovom radu istražena je izravna, takozvana in situ transesterifikacija kojom se proizvodi biodizel iz taloga kave bez potrebe za prethodnom ekstrakcijom ulja i postupcima esterifikacije. In situ transesterifikacija provedena je posredstvom metanola i lužnatog konvencionalnog homogenog te nekonvencionalnog heterogenog katalizatora u magnetskoj miješalici i Soxhlet aparaturi. Nadalje, ovaj rad omogućuje uvid u usporedbu nekonvencionlne i konvencionalne reakcije transesterifikacije. Prilikom provedbe konvencionalne metode ulje je ekstrahirano Soxhlet metodom pomoću n-heksana te zatim pročišćeno niskotemperaturnim eutektičkim otapalom na bazi kalijevog karbonata. Sinteza je provedena uz kalijev hidroksid kao katalizator, a dobiveni sirovi biodizel pročišćen je niskotemperaturnim eutektičkim otapalom na bazi kolin klorida.

Abstract (english)

Serious environmental concerns regarding the use of fossil-based fuels have raised awareness about necessity of alternative clean fuels. Biodiesel fuel is considered a clean, biodegradable and non-toxic alternative for diesel fuel. Given the large global production and consumption of coffee, coffee waste is a potential non-edible feedstock for biodiesel production due to its high oil content and availability worldwide. In this paper, direct, so-called in situ transesterification by which biodiesel is produced from coffee grounds without the need for prior oil extraction and esterification processes was investigated. In situ transesterification was performed using methanol and an alkaline conventional homogeneous and unconventional heterogeneous catalyst in a magnetic stirrer and Soxhlet apparatus. Furthermore, this paper provides insight into the comparison of unconventional and conventional transesterification reactions. When carrying out the conventional method, the oil was extracted by the Soxhlet method using n-hexane and then purified with a potassium carbonate-based deep eutectic solvent. The synthesis was carried out with potassium hydroxide as a catalyst and the obtained crude biodiesel was purified with a choline chloride based deep eutectic solvent.

• Keywords: biodizel; in situ transesterifikacija; niskotemperaturna eutektička otapala; otpadni talog kave
• Keywords (english): biodiesel; in situ transesterification; deep eutectic solvents; coffee waste
• Language: croatian
• URN:NBN: urn:nbn:hr:149:214296
• Project: Number: KK.01.1.1.04.0070; Title: Razvoj sustava za ispitivanje višefaznih strujanja i izgaranja s ciljem povećanja istraživačkih aktivnosti znanstvenog i poslovnog sektora; Acronym: RESIN; Leader: Milan Vujanović; Jurisdiction: Croatia; Funder: MRRFEU; Funding stream: Nema
• 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: 2023-05-03 10:28:56