Spent coffee grounds as a renewable source for ecopolyols production
| Autor: | Rui J.C. Silva, Inês Brandão, Carmen S. R. Freire, Ana Barros-Timmons, Belinda Soares, Carlos Pascoal Neto, Artur Ferreira, Nuno Gama |
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| Rok vydání: | 2014 |
| Předmět: |
General Chemical Engineering
Biomass 02 engineering and technology 010402 general chemistry 7. Clean energy 01 natural sciences Catalysis Inorganic Chemistry chemistry.chemical_compound Polyol Organic chemistry Waste Management and Disposal Polyurethane chemistry.chemical_classification Renewable Energy Sustainability and the Environment Chemistry Organic Chemistry Liquefaction Sulfuric acid 021001 nanoscience & nanotechnology Biorefinery Pulp and paper industry Pollution 0104 chemical sciences Fuel Technology 13. Climate action Hydroxyl value 0210 nano-technology Biotechnology |
| Zdroj: | Journal of Chemical Technology & Biotechnology. 90:1480-1488 |
| ISSN: | 0268-2575 |
| DOI: | 10.1002/jctb.4457 |
| Popis: | BACKGROUND Based on the biorefinery concept, the main focus of this work was the increase in value of spent coffee grounds via an acid liquefaction process using polyhydric solvents in the presence of sulfuric acid, at moderate temperature. For that purpose the effect of temperature, sulfuric acid concentration and time on biomass conversion was studied using design of experiments combined with statistical analysis. RESULTS The ANOVA results (95% confidence level) showed that temperature is the factor with most influence on biomass conversion, within the studied range, while reaction times above 40 min don't seem to bring significant advantages. The maximum conversion obtained in this study was 70 wt% which was achieved at 160°C, 4 wt % of catalyst and 80 min. The polyol obtained using these conditions presented a hydroxyl number value of 199 mg KOH/g polyol and a viscosity of 390 cP, at 25°C. CONCLUSION This work showed that it is possible to convert spent coffee grounds into liquid polyols via an acid liquefaction process at moderate temperature and autogeneous pressure. These polyols have similar properties to those of petroleum-based polyols typically used in the polyurethane foam industry. © 2014 Society of Chemical Industry |
| Databáze: | OpenAIRE |
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