1000 resultados para Industria de celulose - Inovações tecnologicas
CELULOSE DO BAGACO DE CANA-DE-ACUCAR PARA USO FARMACEUTICO-DESENVOLVIMENTO DE PROCESSO PARA OBTENCAO
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In this work, a fibrous cellulose obtained from the sugar cane bagasse was analysed about its binder/disintegrating action and about its interference degree in the dissolution rate ('in vitro') of active principles, when incorporated in a compact system that has a water-soluble drug. It was used as reference drug the Lithium Carbonate, considering its solubility in water and it difficulties in the compressibility and flow rate. That cellulose was evaluated in a comparative study, involving another fibrous cellulose generally used in the tablet obtainment (Microcel 3E-200). After the experiment in methodologies of dry granulation and wet granulation, it was concluded that the analysed celluloses presents adequate binder/disintegrating efficience and they are equivalents in these aspect.
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Recognizing the great potential of this residue to increase the eucalyptus forests produtivity - when used in its humidified form - the main objective of this project was to decompose the solid residues generated at Luiz Antonio mill, in a fast and artificial way, by means of piles or ridges of composted materials. The materials used in this composting process were: activated sludge, dregs and grits, wood ash and biomass. Applications of both phosphorus and potassium have been used during the planting phase. Nitrogen, in the form of urea, has been applied in two treatments with the main purpose to decrease the C/N ratio and to speed up the decomposition process. The experiment was carried out in 120 days. The best results were obtained in residue piles with a 3:1 ratio, i.e., 75% residues + 25% biomass. This mixture provided an extremely good aeration, thus enabling an appropriate material mixing and homogenization. Under the technological viewpoint, the results obtained from the composting process were quite satisfactory for VCP industrial residues treatment. This composting process enabled a material accelerated stabilization (lower C/N ratio) and homogenization. After this experiment, it became possible to use all residues just as they were generated by Luiz Antônio pulp and paper mill. This project is of the utmost relevance to VCP's forestry department as far as a significant amount of nutrients is getting back to the soil in the form of mineral and organic materials.
Resumo:
Cellulose is the most abundant vegetable organic compound, being derived mainly from plant residues. The decomposition of sugar-cane (Saccharum officinarum L.) straw was studied in a period up to 90 days, through variables related to the carbon cycle, such as respiratory activity and CM-cellulase (CM, cellulose microcrystalline) and CMC-cellulase (CMC, carboxymethylcellulose) activities. The treatments consisted of 0, 0.5 and 1.0% of straw, in the presence and absence of vinasse (a sugar-cane alcohol industry byproduct) and nitrogen fertilizer. The respiratory and cellulase activities increased up to the 14th day of incubation and later decreased. The respiratory activity was 1.9 and 2.3 fold larger (P < 0.05) in the soil with 0.5 and 1.0% of straw added, respectively, in relation to the control. CM- and CMC- cellulase activities also increased from 1.8 to 2.9 and from 2.3 to 2.7 fold, respectively. The vinasse addition enhanced CO 2 production and CM-cellulase activity, however, no significant effect was observed on CMC-cellulase activity. The addition of N reduced both respiratory and cellulase activities. The decomposition of the sugar-cane straw may enhance soil nutrient cycling increasing agricultural production. © 2006 Instituto de Investigaciones Agropecuarias, INIA.
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The compaction behavior of powdered solids can be strongly influenced by the physicochemical properties of excipients because they are frequently present in the tablet in larger amounts than the drug itself. The aim of this study was to assess the influence of the granule size of the cellulose on the physical characteristics of tablets produced in punches of different diameters, since this relation has never been explored in the literature. Granules of several sizes were produced by wet granulation and compressed in punches of various diameters by applying different forces. Size distribution, apparent density and flow of granules were assessed, as well as physical characteristics of the tablets (weight, hardness, friability and disintegration time). Reducing the granule size resulted in tablets of adequate crushing strength and fast disintegration; moreover, it allowed tablets to be produced without the need to use forces near the upper limit of the press, thus avoiding premature wear on the tabletting machine. Thus, once a suitable size for a given tablet formulation has been chosen, the granule size selected has been shown to determine the crushing strength of the tablet.
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Casos exitosos de pequeñas y medianas empresas en México: la industria del vestido en Aguascalientes
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