Extraction and esterification of waste coffee grounds oil as non-edible feedstock for biodiesel production

Chokchai Mueanmas, Ruamporn Nikhom, Anida Petchkaew, Jutarut Iewkittayakorn and Kulchanart Prasertsit

Renewable Energy, 2019, vol. 133, issue C, 1414-1425

Abstract: The potential of waste coffee grounds (WCG) as a non-edible feedstock for biodiesel production was evaluated in term of extraction and esterification of waste coffee grounds oil (WCGO). The effect of liquid-solid extraction parameters such as the type and volume of solvent, the extraction time and temperature, and mixing speed were thoroughly investigated. The highest yield of oil extracted from WCGO was 15.47 wt% obtained at a hexane to WCG ratio of 9:1 (v/w) with a mixing speed of 200 rpm and an extraction duration of 5 min at room temperature. An esterification reaction was conducted as a pre-treatment step to reduce the concentration of free fatty acid (FFA), optimized by response surface methodology (RSM) combined with a central composite design (CCD). The results indicated that all the parameters including the methanol (MeOH) to FFA molar ratio, quantity of catalyst, reaction time and temperature were significant for %FFA removal. In the esterification step, the FFA conversion was 95% at the predicted optimization condition which corresponded to the experimental data. Therefore, the results of this study support the utilization of WCGO as a source of non-edible oil feedstock for biodiesel production.

Keywords: Waste coffee grounds oil; Biodiesel feed stock; Solvent extraction; Esterification (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (6)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0960148118310528
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:133:y:2019:i:c:p:1414-1425

DOI: 10.1016/j.renene.2018.08.102

Access Statistics for this article

Renewable Energy is currently edited by Soteris A. Kalogirou and Paul Christodoulides

More articles in Renewable Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().