Fatty acid methyl esters from waste beef tallow using supercritical methanol transesterification

Ricardo García-Morales, Abel Zúñiga-Moreno, Francisco J. Verónico-Sánchez, José Domenzain-González, Hugo I. Pérez-López, Christian Bouchot, Octavio Elizalde-Solis

Research output: Contribution to journalArticlepeer-review

Abstract

The aim of this work is to perform synthesis of fatty acid methyl esters by means of one-step supercritical methanol transesterification from waste beef tallow without pre-treatment. Animal waste samples were collected from local markets and the experiments were carried out in a 170 cm3 batch reactor made of Inconel 625 alloy. On the first set of experiments, the fatty acid methyl esters were obtained by varying methanol:waste beef tallow (M:WBT) molar ratios from 25:1 to 47:1, at 613 K, 60 min of synthesis and pressures up to 27 MPa. Due to the high yield, a second set of transesterification reactions was carried out in order to assess the temperature effect in the interval of (578–693) K while keeping the molar ratio of 45:1. The fatty acid methyl esters were characterized by Fourier-transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), gas chromatography coupled to mass spectrometry (GC-MS), high performance liquid chromatography coupled to mass spectrometry (HPLC-MS), cryoscopy, Gardner color, water content, free fatty acids and cloud point; calculations of the global yield from NMR and predicted cetane number were also performed.

Original languageEnglish
Article number122706
JournalFuel
Volume313
DOIs
StatePublished - 1 Apr 2022
Externally publishedYes

Keywords

  • Beef tallow
  • Fatty acid methyl esters
  • Supercritical methanol
  • Transesterification

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