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