Separation of value-added chemical groups from bio-oil of olive mill waste
| Autor: | Esteve Fàbregas, Jordi Bartrolí, Cristina del Pozo, Neus Puy |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
Biodiesel Chromatography Chemistry 020209 energy Aqueous two-phase system Ethyl acetate 02 engineering and technology 010501 environmental sciences Biorefinery 01 natural sciences Hexane chemistry.chemical_compound Acetic acid Biogas 0202 electrical engineering electronic engineering information engineering Monosaccharide Agronomy and Crop Science 0105 earth and related environmental sciences |
| Zdroj: | Industrial Crops and Products. 125:160-167 |
| ISSN: | 0926-6690 |
| DOI: | 10.1016/j.indcrop.2018.08.062 |
| Popis: | The sector of olive oil (Olea europaea) produces a large quantity of waste per year which is usually dried and deoiled resulting in a by-product known as Olive Mill Wastes (OMW). This waste can be used as a source of energy; however, its composition also indicates a potential use as a source of chemicals. Intermediate pyrolysis of OMW resulted in a bio-oil composed of value-added products divided in two phases: an aqueous phase (AP) containing acetic acid, monosaccharides and phenolic derivatives, and a non-aqueous phase (NAP) composed of phenolic derivatives and fatty acids and their methyl esters. The main purpose of the study was to separate these compounds in interest chemical groups to increase the value of the residue inside biorefinery concept. Two liquid-liquid extraction methods, an extraction at original pH and an acid-base extraction, were studied. The results showed that acid-base extraction method, performed with hexane at pH 12 followed by an ethyl acetate extraction at pH 6, was the best method to extract value-added chemical groups in both AP and NAP bio-oil phases. Acetic acid used as chemical platform was found together with monosaccharides, that could be used to study its viability in biogas/bioethanol production, in AP aqueous phase. Phenolic derivatives, potentially useful in food, pharmaceutical and/or cosmetic industry, were found in both AP hexane and NAP ethyl acetate phases. Finally, methyl esters of fatty acids which could be directed to produce biodiesel were found in NAP hexane phase. As a result, this study allows the revaluation of OMW as a first step towards circular economy and bioeconomy. |
| Databáze: | OpenAIRE |
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