Characterization Of Recovered Black Liquor And Isolated Lignin From Oil Palm Empty Fruit Bunch Soda Pulping For Semichemical And Chemical Pulps

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Date
2008-06
Authors
NG SU NIE, ANNIE
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The spent liquid after the pulping process in pulp mill, generally known as black liquor contains degraded lignin and carbohydrates and inorganic compounds. Results showed that the pH and the residual alkali of black liquor increased with the increase of total alkali used during the pulping process whilst the black liquor's viscosity mainly depends on the dissolved lignin. The increase of alkali charge resulted higher dry solid yield due to the increase of both inorganic compounds and dissolved organic compounds. The addition of anthraquinone (AQ) in the pulping process showed an improved carbohydrates stabilization and better delignification. Analysis by Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) showed that the isolated lignin contains traces of inorganic compounds, while Gas Chromatography (GC) analysis showed that black liquor with AQ had lesser carbohydrates content than black liquor without AQ. Optimum lignin precipitation was obtained at pH 2 and comparably result could be obtained at pH 4.5 followed by 1 hour heating. However, the carbonation process did not show significant improvement on lignin precipitation. The analyses of functional groups by Frourier Transform Infrared Spectroscopy (FT-IR) showed not much different among five types of isolated lignin. Besides, the black liquor dry solid sample showed less functional group than isolated lignin. The analysis by Gas Chromatography-Mass Spectrometry (GC-MS) showed that typical compounds such as benzaldehyde, 4-hydroxy-3,5-dimethoxy- and ethanone, 1-(4-hydroxy-3,5-dimethoxyphenyl) were found in isolated lignin.
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Characterization Of Recovered Black Liquor And Isolated Lignin From Oil Palm Empty Fruit Bunch Soda Pulping , For Semichemical And Chemical Pulps
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