Separation of lignocelluloses from spent liquor of NSSC pulping process via adsorption
| Autor: | Mehdi Dashtban, Allan Gilbert, Pedram Fatehi |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Paper
Environmental Engineering Management Monitoring Policy and Law Furfural Lignin Waste Disposal Fluid chemistry.chemical_compound Adsorption Polysaccharides medicine Levulinic acid Organic chemistry Furaldehyde Hemicellulose Waste Management and Disposal Biological Oxygen Demand Analysis Chemical oxygen demand Temperature General Medicine Pulp and paper industry Wood Levulinic Acids chemistry Charcoal Thermogravimetry Hydroxymethylfurfural Activated carbon medicine.drug |
| Zdroj: | Journal of Environmental Management. 136:62-67 |
| ISSN: | 0301-4797 |
| DOI: | 10.1016/j.jenvman.2014.01.032 |
| Popis: | Hemicelluloses and lignin present in the spent liquor (SL) of neutral sulfite semichemical (NSSC) pulping process can potentially be converted into value-added products such as furfural, hydroxymethylfurfural, levulinic acid, phenols and adhesives. However, the direct conversion of hemicelluloses and lignin of SL into value-added products is uneconomical due to the dilute nature of the SL. To have a feasible downstream process for utilizing lignocelluloses of SL, the lignocelluloses should initially be separated from the SL. In this study, an adsorption process (via applying activated carbon) was considered for isolating the dissolved lignin and hemicelluloses from the SL of an NSSC pulping process. Under the optimal conditions of pH, SL/AC weight ratio, time and temperature of 5.7, 30, 360 min and 30 °C, the maximum lignin and hemicellulose adsorptions were 0.33 and 0.25 g/g on AC. The chemical oxygen demand (COD) and turbidity of the SL were decreased by 11% and 39%, respectively, as a result of lignocellulose adsorption on AC. Also, the incineration behavior of the SL-treated AC was studied with a thermo-gravimetric analysis (TGA). |
| Databáze: | OpenAIRE |
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