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Physicochemical Characterization of Robusta Spent Coffee Ground Oil for Biodiesel Manufacturing

  • Chi-Hien Dang
  • Thanh-Danh Nguyen
Original Paper

Abstract

Oil extracted from spent coffee ground (SCG) has been well known as a potential feedstock for high quality biodiesel production. This work was to investigate extraction, physical and chemical characterizations of Robusta coffee oil (CO) and its application for biodiesel production. Analysis of seven coffee ground (CG) samples showed that oil content in CGs depended on technique of the manufacturer. Morphological changes of CGs surface were recorded by FESEM technique which showed the particle size significantly increased with the oil loss. Infrared spectroscopies revealed absence of SCG oil in the de-oiled SCG, confirmed that soxhlet method in hexane was used efficiently for the oil extraction. Thermal properties of SCG oil, fresh coffee ground (FCG), SCG and de-oiled SCG samples were investigated by simultaneous TG–DTA measurement. The obtained data showed the oil content relating to thermal changes of SCG samples. Comparison between chemical components of Robusta coffee bean (RCB) and SCG reflected a fact that most of oil content in the SCG could be originated in manufacturing process of FCG. Quality biodiesel product has prepared from SCG oils via a two-step process. After pre-treatment process, transesterification of SCG oils was carried out with methanol (v/v, 30%) and NaOH (w/v, 1%) in yield 89.2%.

Graphical Abstract

Keywords

Robusta Spent coffee ground Oil Physicochemical properties Biodiesel Feedstock 

Abbreviations

SCG

Spent coffee ground

CO

Coffee oil

RCB

Robusta coffee bean

FCG

Fresh coffee ground

TG

Thermogravimetric

DTA

Differential thermal analysis

FA

Fatty acid

FFA

Free fatty acid

FAME

Fatty acid methyl ester

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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  1. 1.Graduate University of Science and Technology, Vietnam Academy of Science and TechnologyHanoiVietnam
  2. 2.Institute of Research and DevelopmentDuy Tan UniversityDa Nang CityVietnam
  3. 3.Institute of Chemical TechnologyVietnam Academy of Science and TechnologyHo Chi Minh CityVietnam

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