Precipitation of kraft black liquors by alcohol-calcium solutions
Industrial and laboratory kraft black liquors were precipitated with a) water-soluble solvents (alcohols and acetone), b) calcium and aluminum salts, and c) alcohol-calcium solutions. Volume of solvent and the amount of Ca (or Al) were varied over wide intervals, and their effect on the amount and composition of precipitate was studied. Alcohol-calcium solutions were the best precipitating agent (90% of the lignin was recovered with good filterability). The pollutant load of the resulting filtrate showed considerable reductions in some parameters. Precipitation of black liquors with alcohol-calcium solution instead of acid precipitation or Ultrafiltration may be an alternative to combustion.
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| Main Authors: | , , |
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| Format: | journal article biblioteca |
| Language: | eng |
| Published: |
1996
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| Online Access: | http://hdl.handle.net/20.500.12792/4700 |
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| Summary: | Industrial and laboratory kraft black liquors were precipitated with a) water-soluble solvents (alcohols and acetone), b) calcium and aluminum salts, and c) alcohol-calcium solutions. Volume of solvent and the amount of Ca (or Al) were varied over wide intervals, and their effect on the amount and composition of precipitate was studied. Alcohol-calcium solutions were the best precipitating agent (90% of the lignin was recovered with good filterability). The pollutant load of the resulting filtrate showed considerable reductions in some parameters. Precipitation of black liquors with alcohol-calcium solution instead of acid precipitation or Ultrafiltration may be an alternative to combustion. |
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