Biodiesel production by direct transesterification of wet spent coffee grounds using switchable solvent as a catalyst and solvent

Spent coffee grounds (SCG), the residue after brewing coffee beverage, is a promising biodiesel feedstock due to its high oil contents (15‒20%). However, SCG should be pretreated to reduce the high free fatty acid content, which hampers transesterification reaction. To overcome this, we explored a direct transesterification reaction of SCG using ultrasound irradiation and identified the optimal sonication parameters. A high fatty acid methyl ester (FAME) content, up to 97.2%, could be achieved with ultrasound amplitude of 99.2 <i>μ</i>m, irradiation time of 10 min, and methanol to oil ratio of 7:1 in the presence of potassium hydroxide concentration of 1.25 wt.%. In addition, we demonstrated that ultrasound irradiation is an efficient method to produce biodiesel from untreated SCG in a short time with less energy than the conventional mechanical stirring method. The physical and chemical properties of the SCG biodiesel met the requirements for an alternative fuel to the current commercial biodiesel.

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Potential biodiesel production from Brazilian plant oils and spent coffee grounds by Beauveria bassiana lipase 1 expressed in Aspergillus nidulans A773 using different agroindustry inputs

Journal of Cleaner Production ◽

10.1016/j.jclepro.2020.120513 ◽

2020 ◽

Vol 256 ◽

pp. 120513 ◽

Cited By ~ 2

Author(s):

Enrico Cerioni Spiropulos Gonçalves ◽

Malena Martínez Pérez ◽

Ana Claudia Vici ◽

Jose Carlos Santos Salgado ◽

Mariana de Souza Rocha ◽

...

Keyword(s):

Aspergillus Nidulans ◽

Beauveria Bassiana ◽

Biodiesel Production ◽

Plant Oils ◽

Spent Coffee Grounds ◽

Coffee Grounds

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The energy usage and environmental impact assessment of spent coffee grounds biodiesel production by an in-situ transesterification process

Energy for Sustainable Development ◽

10.1016/j.esd.2017.07.002 ◽

2017 ◽

Vol 40 ◽

pp. 50-58 ◽

Cited By ~ 15

Author(s):

Nattapong Tuntiwiwattanapun ◽

Parnuwat Usapein ◽

Chantra Tongcumpou

Keyword(s):

Environmental Impact ◽

Impact Assessment ◽

Environmental Impact Assessment ◽

Biodiesel Production ◽

In Situ Transesterification ◽

Energy Usage ◽

Spent Coffee Grounds ◽

Coffee Grounds

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Biodiesel Production from Spent Coffee Grounds

Research Papers Faculty of Materials Science and Technology Slovak University of Technology ◽

10.1515/rput-2017-0013 ◽

2017 ◽

Vol 25 (40) ◽

pp. 113-121 ◽

Cited By ~ 3

Author(s):

Lenka Blinová ◽

Alica Bartošová ◽

Maroš Sirotiak

Keyword(s):

Organic Solvents ◽

Oil Extraction ◽

Waste Material ◽

Biodiesel Production ◽

Spent Coffee Grounds ◽

Drying Oil ◽

Biodiesel Feedstock ◽

Coffee Grounds ◽

Coffee Oil

Abstract The residue after brewing the spent coffee grounds is an oil-containing waste material having a potential of being used as biodiesel feedstock. Biodiesel production from the waste coffee grounds oil involves collection and transportation of coffee residue, drying, oil extraction, and finally production of biodiesel. Different methods of oil extraction with organic solvents under different conditions show significant differences in the extraction yields. In the manufacturing of biodiesel from coffee oil, the level of reaction completion strongly depends on the quality of the feedstock oil. This paper presents an overview of oil extraction and a method of biodiesel production from spent coffee grounds.

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