title: High-purity biodiesel production from microalgae and added-value lipid extraction: a new process.
abstract: A new process was tested in order to produce and purify biodiesel from microalgae lipids and to recover unsaponifiable (added-value) lipids. This process is a two-step biodiesel production including a saponification reaction step followed by an esterification reaction step. The process includes a recovery of the unsaponified lipids between both reaction steps. Among the conditions tested, the following conditions were found to be the best: temperature for both steps (90 °C), saponification time (30 min), esterification time (30 min), sulfuric acid/potassium hydroxide (1.21, w/w), and methanol-lipid ratio (13.3 mL/g). Under these conditions, the fatty acid methyl ester (FAME) yield and the biodiesel purity were, respectively, 32% (g FAME/g lipid) and 77% (g FAME/g biodiesel). This study also showed that the two-step biodiesel process allows a FAME mass composition rich in palmitate (27.9-29.4 wt%), palmitoleate (24.9-26.0 wt%), elaidate (14.8-15.2 wt%), and myristate (12.1-13.0 wt%).
authors.affiliation: Department of Chemical Engineering and Biotechnological Engineering, Engineering Faculty, Université de Sherbrooke, 2500 boulevard de l'Université, Sherbrooke, QC, Canada, J1K 2R1.
authors.forename: M
authors.initials: M
authors.lastname: Veillette
authors.forename: A
authors.initials: A
authors.lastname: Giroir-Fendler
authors.forename: N
authors.initials: N
authors.lastname: Faucheux
authors.forename: M
authors.initials: M
authors.lastname: Heitz
mesh_terms: D056804:Biofuels; D004951:Esterification; D005227:Fatty Acids / Q000032:analysis; D008055:Lipids / Q000302:isolation & purification*; D058086:Microalgae / Q000737:chemistry*; D013696:Temperature; D013997:Time Factors
chemical_list: D056804:Biofuels; D005227:Fatty Acids; D008055:Lipids