An innovative method of extraction of coffee oil using an advanced microwave system: in comparison with conventional Soxhlet extraction method

Hibbert, Sam; Welham, Kevin; Zein, Sharif H.

doi:10.1007/s42452-019-1457-5

An innovative method of extraction of coffee oil using an advanced microwave system: in comparison with conventional Soxhlet extraction method

Hibbert, Sam; Welham, Kevin; Zein, Sharif H.

Authors

Sam Hibbert

Kevin Welham

Sharif H. Zein

Abstract

The production of energy and chemicals from waste biomass is an attractive alternative by comparison with first generation biofuels and fossil feedstocks. This paper investigates oil extraction from spent coffee grounds (SCG) by means of an advanced microwave process and compares this with a conventional Soxhlet extraction (SE) method. Microwave assisted oil extraction (MAE) from SCG was performed over different durations, varying solvent volumes and extraction temperatures. It was found that each of these parameters had an effect on the process, with the largest yield being over 11.54 wt %, oil extracted in 10 minutes using 160 ml of hexane at 95 oC. In 10 minutes, MAE was successful in extracting more oil than SE. MAE achieved a 24 fold decrease in duration for the extraction compared with SE and used less solvent per gram of oil produced. It is proposed that a certain moisture content in the SCG would be beneficial to the extraction process and might it also play a role in the heating process. The extracted oil can be converted into biodiesel and biochemicals leaving the remaining solids suitable for processing into bioethanol, fertiliser, adsorptive material and fuel pellets.

Citation

Hibbert, S., Welham, K., & Zein, S. H. (2019). An innovative method of extraction of coffee oil using an advanced microwave system: in comparison with conventional Soxhlet extraction method. SN Applied Sciences, 1(11), Article 1467. https://doi.org/10.1007/s42452-019-1457-5

Journal Article Type	Article
Acceptance Date	Oct 3, 2019
Online Publication Date	Oct 24, 2019
Publication Date	2019-11
Deposit Date	Oct 2, 2019
Publicly Available Date	Oct 2, 2019
Journal	SN Applied Sciences
Electronic ISSN	2523-3971
Publisher	Springer (part of Springer Nature)
Peer Reviewed	Peer Reviewed
Volume	1
Issue	11
Article Number	1467
DOI	https://doi.org/10.1007/s42452-019-1457-5
Keywords	Coffee oil; Extraction; Microwave; Soxhlet; Spent coffee grounds
Public URL	https://hull-repository.worktribe.com/output/2833794
Publisher URL	https://link.springer.com/article/10.1007/s42452-019-1457-5
Contract Date	Oct 2, 2019

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