Naslov
Green routine for biodiesel production from waste coffee grounds

Autori
Nascimento Mrakovčić, Nikolina ; Posedi, Tina ; Židanić, Dolores ; Petračić, Ana ; Sander, Aleksandra

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
1st International Students’ GREEN Conference Book of abstracts 2018 ; Proceedings of 1st International Students GREEN Conference 2021 / Habuda-Stanić, Mirna - Osijek : Studio HS internet, 2021, 244-254

ISBN
978-953-7005-56-6

Skup
1. međunarodna studentska GREEN konferencija = 1st International Students’ GREEN Conference (ISC GREEN 2018)

Mjesto i datum
Osijek, Hrvatska, 17.05.2018. - 18.05.2018

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
biodiesel ; deep eutectic solvents ; liquid-liquid extraction ; waste coffee grounds

Sažetak
Biodiesel can be produced from different types of feedstock. The quality of feedstock influences the quality of biodiesel as well as the quality of exhaust gases. When low quality feedstock is used for base catalysed transesterification, feedstock needs to be purified since only high quality oil or fat will assure production of high quality biodiesel. Waste coffee grounds are proven to be an excellent feedstock for biodiesel production. In this work coffee oil was extracted from dried waste coffee grounds. Since the total acid number was too high, the concentration of free fatty acids was reduced by means of liquid- liquid extraction with deep eutectic solvents based on potassium carbonate. Biodiesel was then synthesised by chemical transesterification in the presence of a homogeneous base catalyst (NaOH) at different reaction conditions (time and quantity of catalyst). Impurities present in crude biodiesel were extracted with a deep eutectic solvent (choline chloride:ethylene glycol, 1:2.5). The feasibility of the proposed methodology was evaluated by extraction efficiency. Optimal extraction time, temperature and mass ratio solvent/biodiesel was selected.

Izvorni jezik
Hrvatski

Znanstvena područja
Kemijsko inženjerstvo

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