Using switchable solvent as a solvent and catalyst for in situ transesterification of spent coffee grounds for biodiesel synthesis

Hoang Chinh Nguyen; My Linh Nguyen; Fu-Ming Wang; Shih-Hsiang Liang; Thi Loan Bui; Hoang Hieu Ha; Chia-Hung Su

doi:10.1016/j.biortech.2019.121770

Using switchable solvent as a solvent and catalyst for in situ transesterification of spent coffee grounds for biodiesel synthesis

Bioresour Technol. 2019 Oct:289:121770. doi: 10.1016/j.biortech.2019.121770. Epub 2019 Jul 7.

Authors

Hoang Chinh Nguyen¹, My Linh Nguyen², Fu-Ming Wang³, Shih-Hsiang Liang⁴, Thi Loan Bui⁵, Hoang Hieu Ha⁶, Chia-Hung Su⁷

Affiliations

¹ Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 10607, Taiwan. Electronic address: nguyenhoangchinh@tdtu.edu.vn.
² Graduate School of Biochemical Engineering, Ming Chi University of Technology, New Taipei City 24301, Taiwan.
³ Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 10607, Taiwan. Electronic address: mccabe@mail.ntust.edu.tw.
⁴ Hsinchu Branch, Livestock Research Institute, Council of Agriculture, Miaoli County 36841, Taiwan.
⁵ Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City 700000, Vietnam.
⁶ Faculty of Biotechnology, Binh Duong University, Thu Dau Mot City, Binh Duong 590000, Vietnam.
⁷ Graduate School of Biochemical Engineering, Ming Chi University of Technology, New Taipei City 24301, Taiwan. Electronic address: chsu@mail.mcut.edu.tw.

PMID: 31320231
DOI: 10.1016/j.biortech.2019.121770

Abstract

This study developed a novel in situ transesterification process by combining the solvent and catalyst functions of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) for biodiesel synthesis from spent coffee grounds (SCG). The influence of reaction parameters on the reaction was investigated. The maximum biodiesel yield of 96.13% was observed at DBU-to-SCG and methanol-to-SCG ratios of 20 and 10 mL/g, respectively; a reaction temperature of 130 °C; and a reaction time of 60 min. Notably, the polarity of DBU could be reversibly regulated, thus facilitating excellent product separation. Moreover, DBU could be effectively reused for 10 cycles to yield high biodiesel conversion. DBU-catalyzed in situ transesterification of SCG is a promising, ecofriendly, and economically viable biodiesel production process.

Keywords: Biodiesel; In situ transesterification; Spent coffee grounds; Switchable solvent.

MeSH terms

Biofuels
Catalysis
Coffee*
Esterification
Solvents
Temperature

Substances

Biofuels
Coffee
Solvents