Kraft Process
Mostrando 13-24 de 47 artigos, teses e dissertações.
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13. Sisal organosolv pulp as reinforcement for cement based composites
The present work describes non-conventional sisal (Agave sisalana) chemical (organosolv) pulp from residues of cordage as reinforcement to cement based materials. Sisal organosolv pulp was produced in a 1:1 ethanol/water mixture and post chemically and physically characterized in order to compare its properties with sisal kraft pulp. Cement based composites
Materials Research. Publicado em: 2009-09
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14. Qualidade da madeira de espécies do gênero Acacia plantadas no Brasil / Wood quality of species of the genus Acacia planted in Brazil
O gênero Acacia apresenta espécies florestais de rápido crescimento, com rotações curtas (7 a 9 anos) e de grande interesse comercial para produção de polpa celulósica, painéis de madeira e energia. No Brasil a utilização de espécies do gênero Acacia na produção de celulose de fibra curta ainda é bastante restrita e são poucos os estudos que
Publicado em: 2009
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15. Evaluation of the conventional and Lo-Solids® kraft process for Pinus taeda wood / Avaliação dos processos kraft convencional e Lo-Solids® para madeira de Pinus taeda
Este trabalho teve como objetivo avaliar a eficiência do processo de polpação Lo- Solids® em relação ao processo de polpação convencional para obtenção de polpa celulósica não branqueável (número kappa 58±2). A espécie de madeira utilizada foi Pinus taeda com 9 anos de idade, que se constitui na principal espécie utilizada no Brasil para obt
Publicado em: 2009
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16. Desenvolvimento do processo de biopolpação de eucalipto em escala piloto para produção de polpas termomecânicas e quimiotermomecânicas / Development of the eucaliptus biopulping process in a pilot scale to produce thermomechanical and chemithermomechanical pulps
Na escala evolutiva dos processos de polpação de alto rendimento (PAR), a mais recente promessa é a biopolpação, ou seja, o pré-tratamento microbiológico do cavaco de madeira utilizado na polpação. Esse pré-tratamento tem o potencial de reduzir o consumo de energia necessária ao refino em até 38%, e ainda, ou consequentemente, melhorar importante
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/08/2008
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17. Reduction efficiency prediction of CENIBRA's recovery boiler by direct minimization of gibbs free energy
The reduction efficiency is an important variable during the black liquor burning process in the Kraft recovery boiler. This variable value is obtained by slow experimental routines and the delay of this measure disturbs the pulp and paper industry customary control. This paper describes an optimization approach for the reduction efficiency determination in
Brazilian Journal of Chemical Engineering. Publicado em: 2008-09
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18. Reprocessing of critical items at basic healthcare units / Reprocessamento de artigos criticos em unidades basicas de saude
The reprocessing of critical items is conducted at Basic Healthcare Units (Unidades Básicas de Saúde - UBS). The complexity and implications of such processes demand that the person responsible conducts it with technical and scientific skills and knowledge, according to pre-established methods and criteria, for control and monitoring of each stage, followi
Publicado em: 2008
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19. Corrosion of ASTM A 285 grade C steel welds used in celullose production by kraft process / Corrosão nas soldas do aço ASTM A 285 grau C empregados na obtenção de celulose pelo método Kraft
In this work samples of ASTM A 285 Grade C class steel, welded with covered electrodes AWS E7018 and AWS E6013, and with variations in the welding energy, were tested electrochemically, immersed in alkaline liquor, which is used in Kraft batch digesters. Workpieces were cut by electroerosion process from base metal (MB), heat affected zone (ZTA) and weld met
Publicado em: 2007
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20. Métodos alternativos para aproveitamentos das hemiceluloses da madeira de eucalipto na indústria de celulose kraft / Alternative methods for using eucalyptus wood hemicelluloses in the kraft cellulose industry
The search for a better use of wood in the pulp industry has fuelled interest in a more rational use of its components, particularly hemicelluloses. This study investigates the impacts of alkaline leaching and self-hydrolysis of wood chips for hemicellulose removal, as well as re-adsorption into the fibers during kraft pulping of dissolved wood solids presen
Publicado em: 2007
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21. Combinação de tratamento biológico aeróbio com processos oxidativos avançados visando intensificar a remoção de matéria orgânica em efluentes da indústria têxtil e de celulose kraft / Combining aerobic biological treatment and advanced oxidation processes to increase organic matter removal in textile and kraft pulp mill effluents
Bleached kraft pulp and textile effluents contain hard to degrade and, or toxic substances, and these industries often cannot meet legal limits for effluent chemical oxygen demand using conventional effluent treatment. Use of advanced oxidation processes (AOPs) is therefore being studied to treat their effluents. AOPs use a strong oxidizing agent to degrade
Publicado em: 2007
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22. Sistemas multiagentes para controle inteligente da caldeira de recuperação. / Multi-agent systems for the intelligent control of a recovery boiler.
Engineers have been introducing better support for procedures of monitoring complex conditions through the application of intelligent decentralized systems, implementing a variety of artificial intelligent techniques. Nowadays it is vastly known that these problems that are consequence of the functional complexity of monitoring conditioning can be solved tro
Publicado em: 2007
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23. Exergy analysis of thermal systems in a pulp and paper production process. / Análise exergética dos sistemas térmicos em um processo de produção de celulose e papel.
This work presents a comparative evaluation from thermodynamic performance view of thermal systems in a Kraft pulp and paper mill. The design information and the data of the industrial operation were collected for the current utility system and for the new system that has been buit. The exergy analysis is applied as the quantitative and qualitative evaluatio
Publicado em: 2007
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24. Advanced oxidative process for treating the effluents from the bleached kraft cellulose industry / Processos oxidativos avançados para tratamento de efluentes de indústria de celulose kraft branqueada
In this work, the processes photo-Fenton, H2O2/UV, TiO2/UV and H2O2/TiO2/UV were compared and optimized in order to obtain organic matter removals from the effluents of the bleached kraft cellulose industry. Those processes were applied before and after the biological treatment of the effluents. Initially, the best pH conditions for application of the proces
Publicado em: 2007