Extraction of saponifiable lipids from wet microalgal biomass for biodiesel production
| Autor: | Luis Esteban Cerdán, Estrella Hita Peña, Emilio Molina Grima, Pedro A. González Moreno, María D. Macías Sánchez, María J. Jiménez Callejón, Alfonso Robles Medina |
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| Rok vydání: | 2014 |
| Předmět: |
Environmental Engineering
Bioengineering chemistry.chemical_compound Microalgae Pressure Biomass Waste Management and Disposal chemistry.chemical_classification Biodiesel Chromatography Esterification Renewable Energy Sustainability and the Environment Fatty Acids Fatty acid Water General Medicine Transesterification Lipids Hexane Kinetics chemistry Biochemistry Biofuel Biodiesel production Biofuels Saponifiable lipid Polyunsaturated fatty acid Biotechnology |
| Zdroj: | Bioresource technology. 169 |
| ISSN: | 1873-2976 |
| Popis: | Saponifiable lipids (SLs) were extracted with hexane from wet biomass (86 wt% water) of the microalga Nannochloropsis gaditana in order to transform them into fatty acid methyl esters (FAMEs, biodiesel). The influence of homogenization pressure on SL extraction yield at low temperature (20-22 °C) was studied. Homogenization at 1700 bar tripled the SL extraction yield. Two biomass batches with similar total lipid content but different lipidic compositions were used. Batch 1 contained fewer SLs (12.0 wt%) and neutral saponifiable lipids (NSLs, 7.9 wt%) than batch 2 (21.6 and 17.2 wt%, respectively). For this reason, and due to the selectivity of hexane toward NSLs, high SL yield (69.1 wt%) and purity (71.0 wt%) were obtained from batch 2. Moreover, this extract contains a small percentage of polyunsaturated fatty acids (16.9 wt%), thereby improving the biodiesel quality. Finally, up to 97.0% of extracted SLs were transformed to FAMEs by acid catalyzed transesterification. |
| Databáze: | OpenAIRE |
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