Acidification of prehydrolysis liquor and spent liquor of neutral sulfite semichemical pulping process
| Autor: | Weijiue Gao, Pedram Fatehi, Mehdi Dashtban, Yonghui Sun |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
Hot Temperature Magnetic Resonance Spectroscopy Environmental Engineering Carbohydrates Dry basis Bioengineering 02 engineering and technology Lignin 01 natural sciences Acidification chemistry.chemical_compound Sulfite 010608 biotechnology Sulfites Furaldehyde Hemicellulose Particle Size Dissolving pulp Waste Management and Disposal Acetic Acid Biological Oxygen Demand Analysis Chromatography Renewable Energy Sustainability and the Environment Lignin carbohydrate complex General Medicine Hydrogen-Ion Concentration 021001 nanoscience & nanotechnology Pulp and paper industry Spent liquor Carbon Molecular Weight Oxygen Kraft process chemistry 0210 nano-technology Black liquor Kraft paper Biotechnology Hydrogen |
| Zdroj: | Bioresource Technology. 218:518-525 |
| ISSN: | 0960-8524 |
| DOI: | 10.1016/j.biortech.2016.06.138 |
| Popis: | Acidification has been commercialized for producing kraft lignin from black liquor of kraft pulping process. This work intended to evaluate the effectiveness of acidification in extracting lignocelluloses from the spent liquor of neutral sulfite semichemical pulping (NSSC) process and from prehydrolysis liquor (PHL) of kraft-based dissolving pulp production process. The results showed that the NSSC and PHL spent liquors had some lignin-carbohydrate complexes (LCC), and that the square weighted counts of particles with a chord length of 50–150 μm in the spent liquors were significantly increased as pH dropped to 1.5. Interestingly, the acidification reduced the lignosulfonate/lignin content of NSSC and PHL by 13% or 20%, while dropped their oligosugars content by 75% and 38%, respectively. On a dry basis, the precipitates had more carbon, hydrogen and a high heating value of 18–22 MJ/kg, but less oxygen, than spent liquors. The precipitates of PHL could be used as fuel. |
| Databáze: | OpenAIRE |
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