Chemical composition and physical properties of black liquors and their effects on liquor recovery operation in Brazilian pulp mills |
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Authors: | Marcelo Cardoso Éder Domingos de Oliveira |
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Affiliation: | a Department of Chemical Engineering/School of Engineering, Federal University of Minas Gerais (UFMG), Rua Espírito Santo, 35-6° Andar, 30160-030 Belo Horizonte, Brazil b Drying Center, Federal University of São Carlos (UFSCar), via Washington Luis, P.O. Box 676, 13565-905 São Carlos, Brazil |
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Abstract: | Black liquor is the major by-product and fuel of pulp mills. In this work, effects of black liquor properties on its recovery unit operation are analyzed. Thus, an experimental methodology for characterizing the principal chemical and physical properties of eucalyptus Kraft and bamboo soda black liquors has been developed, including sample collections from six Brazilian mills. Based on results, eucalyptus and bamboo black liquors present higher contents of non-processing elements (NPEs), higher concentration and different molar mass of lignin than those reported by the pine Kraft black liquor. This leads to distinct rheological properties of these liquors. By comparing results obtained for the both liquors, the bamboo and the eucalyptus, the former has the lowest sulfur level, the highest silicon and lignin concentration and, consequently, the highest apparent viscosity. |
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Keywords: | Eucalyptus and bamboo black liquors Chemical characterization Physical properties Rheology Recovery unit |
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