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

Sam Hibbert, Kevin Welham, Sharif H. Zein

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

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 min using 160 mL of hexane at 95 °C. In 10 min, 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. Graphic Abstract: [Figure not available: see fulltext.].

Original languageEnglish
Article number1467
JournalSN Applied Sciences
Volume1
Issue number11
DOIs
Publication statusPublished - Nov 2019
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2019, The Author(s).

ASJC Scopus Subject Areas

  • General Engineering
  • General Environmental Science
  • General Materials Science
  • General Physics and Astronomy
  • General Chemical Engineering
  • General Earth and Planetary Sciences

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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