Sieve Plate
Mostrando 1-12 de 13 artigos, teses e dissertações.
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1. Drop size in a liquid pulsed sieve-plate extraction column
The (Benzoic acid + kerosene + water) system was studied in a 5.0 cm diameter liquid pulsed liquid-liquid extraction column with a total number of 80 sieve plates. The effect of pulsation intensity, dispersed phase superficial velocity, and continuous phase superficial velocity on volume-surface mean diameter was studied. Generally, the mean drop diameter de
Brazilian Journal of Chemical Engineering. Publicado em: 2009-12
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2. Monitoramento em linha de reações de copolimerização em emulsão de acetato de vinila e acrilato de butila em um reator contínuo pulsado de pratos perfurados usando espectrocospia NIR. / In-line monitoring of vinyl acetate and butyl acrylate emulsion copolymerization in a continuous pulsed sieve plate reactor using NIR spectroscopy.
This work deals with the study of the viability and sensitivity of the on-line monitoring, using NIR spectroscopy, of monomers and polymer concentration and average particle size during continuous vinyl acetatebutyl acrylate emulsion copolymerization carried out in a novel tubular pulsed sieve plate reactor. For the elaboration of NIR calibration models of t
Publicado em: 2009
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3. Desenvolvimento de processo contínuo de copolimerização em emulsão em reator tubular. / Development of a continuous emulsion copolymerization process in a tubular reactor.
Industrial emulsion polymerization processes are usually performed in batch or semi-batch stirred tanks, or in continuous stirred tank reactors (CSTR). Continuous reactors have the advantage of being smaller and providing a better product quality control by the reduction of the batch-to-batch variations. In addition, periodical self-sustained oscillations in
Publicado em: 2008
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4. Development of a methology for numerical and experimental evaluation of liquid/vapour flow in distillation columns / Desenvolvimento de uma metodologia para avaliação numerica e experimental do escoamento liquido/vapor em colunas de destilação
Grande parte dos estudos envolvendo colunas de destilação está fundamentada por modelos macroscópicos de conservação de massa e de energia. Exemplo disto são os modelos de estágios de equilíbrio e de não-equilíbrio. Nestes, os aspectos fluidodinâmicos do escoamento são restritos e orientados à medição de parâmetros macroscópicos. Porém, gr
Publicado em: 2005
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5. Simulation of emulsion copolymerization reactions in a continuous pulsed sieve-plate column reactor
This work addressed the viability of using a pulsed sieve-plate column reactor to carry out continuous vinyl acetate/butyl acrylate emulsion copolymerization reactions. A rigorous mathematical model of emulsion copolymerization reactions in a tubular reactor with axial dispersion was used for this purpose. Operational conditions were defined to attain high m
Brazilian Journal of Chemical Engineering. Publicado em: 2004-09
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6. Extração de biomoleculas em sistemas de duas fases aquosas convencionais e com polimeros termossensiveis
The semi-continuous and continuous extraction of a model enzyme, xylanase, in spray, sieve plates and packed columns were investigated using aqueous two-phase systems composed by polyethylene glycol (PEG) 4000 and potassium phosphate. For the spray column, the dispersed phase hold-up and overall mass transfer coefficients (Ko a) were evaluated for different
Publicado em: 2003
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7. Kinetics of vinyl acetate emulsion polymerization in a pulsed tubular reactor: comparison between experimental and simulation results
A new reactor, the pulsed sieve plate column (PSPC), was developed to perform continuous emulsion polymerization reactions. This reactor combines the enhanced flexibility of tubular reactors with the mixing behavior provided by sieved plates and by the introduction of pulses that is important to prevent emulsion destabilization. The main objective of this wo
Brazilian Journal of Chemical Engineering. Publicado em: 2002-12
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8. Estudo do efeito do tamanho das particulas sobre a hidrodinamica e eficiencia de separação do prato na destilação com particulas fluidizadas
Distillation is the most important separatin process and being a very high energy consuption, even quite small improvments in separation effciency would lead to cost benefits. In the present work is studied a method to improve contact between vapour and liquid in distillatinf dispersions by the addition solid particles to avoid jetting or the formation of la
Publicado em: 1995
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9. Enhancement of Phloem Exudation from Fraxinus uhdei Wenz. (Evergreen Ash) using Ethylenediaminetetraacetic Acid 1
Ethylenediaminetetraacetic acid (EDTA) enhanced the exudation of 14C-labeled assimilates from excised leaflets and whole plant specimens of Fraxinus uhdei Wenz. A 2 millimolar EDTA concentration was found to be most effective in promoting exudation from excised leaflets, while 10 millimolar EDTA was most effective in whole plants experiments. Exudation rate
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10. Structure of Functional Soybean Sieve Elements 12
Soybean (Glycine max cv. Bragg) petiolar tissue containing translocated 14C-sucrose was quick frozen, freeze-substituted in acetone or propylene oxide and embedded in Epon. This procedure allowed cytological observations on sieve elements whose functional condition could be verified by microautoradiography. Sieve elements and companion cells were essentially
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11. Phloem Translocation and Heat-induced Callose Formation in Field-grown Gossypium hirsutum L. 1
Phloem translocation rates in field-grown cotton (Gossypium hirsutum L.) dropped from morning to afternoon and continued to decline toward evening, except that recovery occurred following the hottest afternoon when the maximum temperature was 44 C. Water deficits increased from morning to evening, and severity of deficits generally were proportional to dayti
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12. Time-dependent Behavior of a Mathematical Model for Munch Translocation: Application to Recovery from Cold Inhibition
The time evolution of a Munch pressure-flow translocation system is calculated using a numerical computer method. Results are obtained for the time course of the system variables following application of a large resistance in the translocation path, intended to simulate a cold block. The resistance factor required to produce translocation inhibition indicate