Role of lignin and sodium carbonate on the swelling behavior of black liquor droplets during combustion
| Autor: | Chengcong Chen, Raimo Alén, Hannu Pakkanen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
Inorganic chemistry macromolecular substances Combustion 01 natural sciences complex mixtures Biomaterials chemistry.chemical_compound 010608 biotechnology medicine Lignin chemical recovery high definition video camera sodium carbonate kraft lignin 040101 forestry Molar mass Chemistry fungi moolimassa technology industry and agriculture food and beverages ligniini mustalipeä 04 agricultural and veterinary sciences Chemical recovery maximum swelling of droplets droplet swelling Kraft process 0401 agriculture forestry and fisheries Swelling medicine.symptom Sodium carbonate Black liquor |
| Popis: | A partial removal of lignin from black liquor (BL) by carbonation and lignin precipitation was studied. In lignin-lean BL droplets during combustion in a laboratory furnace at 800°C in stagnant air, the maximum swelling was decreased. This observation was interpreted as showing that the lignin content decrement is due mainly to removal of higher molar mass (HMM) lignin and that the Na2CO3content of the BL is increased. Stepwise precipitation experiments with industrial softwood and hardwood kraft BLs by carbonation (resulting in pH decrement from 13 to 9) indicated that a fraction of HMM lignin (MM >10 kDa) with a higher amount of carbohydrates precipitated more prominently and earlier than the fraction with lower molar mass (LMM) lignin (MM 10 kDa) and BL-originated aliphatic carboxylic acids were performed and found that the mixture of medium MM fraction (MM 5–10 kDa) swelled more than the other lignin fractions. The addition of Na2CO3to BL also reduced the maximum swelling of a BL droplet. |
| Databáze: | OpenAIRE |
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