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Synthesis of fatty acid methyl esters via direct transesterification with methanol/carbon dioxide mixtures from spent coffee grounds feedstock

Research output: Contribution to journalJournal article


  • Filipe Calixto
  • Joao Fernandes
  • Ricardo Couto
  • Elvis J. Hernandez
  • Vesna Najdanovic-Visak
  • Pedro C. Simoes
  • Vesna Najdanovic-Visak
<mark>Journal publication date</mark>2011
<mark>Journal</mark>Green Chemistry
Issue number5
Number of pages7
Pages (from-to)1196-1202
<mark>Original language</mark>English


The feasibility of in situ extraction and transesterification of spent coffee ground oil into fatty acid methyl esters with supercritical methanol has been investigated in the temperature range 473-603 K, and in the pressure range 10.0-30.0 MPa. At 30.0 MPa and 603 K, a fatty acid methyl esters (FAME) yield of 84.9% was obtained. Carbon dioxide was added to methanol with the aim of reducing the operating temperature and pressure. It was demonstrated that at a reaction temperature of 573 K, pressure of 10.0 MPa and a CO(2)/MeOH molar ratio of 0.11, a FAME yield of 93.4% was obtained.