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
Dr Sharif Zein S.H.Zein@hull.ac.uk
Director of Postgraduate Research, Chemical Engineering Department
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.
Hibbert, S., Welham, K., & Zein, S. (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), https://doi.org/10.1007/s42452-019-1457-5
|Journal Article Type||Article|
|Acceptance Date||Oct 3, 2019|
|Online Publication Date||Oct 24, 2019|
|Deposit Date||Oct 2, 2019|
|Publicly Available Date||Oct 25, 2020|
|Journal||SN Applied Sciences|
|Publisher||Springer (part of Springer Nature)|
|Peer Reviewed||Peer Reviewed|
|Keywords||Coffee oil; Extraction; Microwave; Soxhlet; Spent coffee grounds|
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