Batch Experiments
Mostrando 25-36 de 261 artigos, teses e dissertações.
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25. MODELING STYRENE HYDROGENATION KINETICS USING PALLADIUM CATALYSTS
Abstract The high octane number of pyrolysis gasoline (PYGAS) explains its insertion in the gasoline pool. However, its use is troublesome due to the presence of gum-forming chemicals which, in turn, can be removed via hydrogenation. The use of Langmuir-Hinshelwood kinetic models was evaluated for hydrogenation of styrene, a typical gum monomer, using Pd/9%N
Braz. J. Chem. Eng.. Publicado em: 2016-09
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26. Sugarcane straw as a feedstock for xylitol production by Candida guilliermondii FTI 20037
Abstract Sugarcane straw has become an available lignocellulosic biomass since the progressive introduction of the non-burning harvest in Brazil. Besides keeping this biomass in the field, it can be used as a feedstock in thermochemical or biochemical conversion processes. This makes feasible its incorporation in a biorefinery, whose economic profitability c
Braz. J. Microbiol.. Publicado em: 2016-06
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27. Investigation of Copper Extraction from Aqueous Sulfate Solution in a Rotating Disc Contactor
The extraction of copper from aqueous sulfate solution with new extractant Cupromex-3302 (active substance is the 5-nonylsalicylaldoxime) using a rotating disc contactor (RDC) was investigated. It was observed from batch experiments that the best results were obtained with the initial aqueous pH and concentration of Cupromex-3302 of 1.9 and 10% (v/v) respect
J. Braz. Chem. Soc.. Publicado em: 2016-05
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28. STERIC MASS ACTION MODEL FOR LACTOFERRIN ADSORPTION IN CRYOGEL WITH IMMOBILIZED COPPER IONS
Abstract Parameters of equilibrium adsorption obtained from experiments using immobilized metal affinity chromatography (IMAC) were used to evaluate the applicability of the steric mass-action (SMA) model to describe the adsorption of lactoferrin to cryogel resin under different conditions. The adsorption of lactoferrin on continuous supermacroporous cryogel
Braz. J. Chem. Eng.. Publicado em: 2016-03
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29. REMOVAL OF ESTROGENS BY ACTIVATED SLUDGE UNDER DIFFERENT CONDITIONS USING BATCH EXPERIMENTS
AbstractWastewater treatment by deactivated and activated sludge was investigated to evaluate the removal of estrogens [estrone (E1), 17β-estradiol (E2), 17α-ethinylestradiol (EE2)] via adsorption and degradation. Different treatment conditions were used, including three mixed liquor volatile suspended solid (MLVSS) concentrations, three methanol concentra
Braz. J. Chem. Eng.. Publicado em: 2015-06
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30. Odor from anaerobic digestion of swine slurry: influence of pH, temperature and organic loading
Farm slurry management from storage and/or treatment is the main source of odors from swine production, which are determined by factors such as operational variations (organic loading), cleaning of facilities and animal diet (pH) or environmental conditions (temperature). The aim of this study was to evaluate the influence of pH, temperature and organic load
Sci. agric. (Piracicaba, Braz.). Publicado em: 2014-12
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31. Removal of the synthetic dye Remazol Brilliant Blue R from textile industry wastewaters by biosorption on the macrophyte Salvinia natans
Batch experiments were carried out for biosorption of Remazol Brilliant Blue R dye onto the macrophyte Salvinia natans. Effects of parameters such as initial dye concentration, pH, biosorbent dosage, contact time and temperature were investigated. Chemical and morphological characteristics of the biosorbent were evaluated before and after the biosorption pro
Braz. J. Chem. Eng.. Publicado em: 2014-12
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32. Biosorption study of Ni2+ and Cr3+ by Sargassum filipendula: kinetics and equilibrium
In this work, the biosorption of Cr3+ and Ni2+ by Sargassum filipendula pre-treated with CaCl2 was studied. Kinetic and equilibrium experiments were carried out for mono- and multi-component solutions in a batch reactor at pH 3.0 and 30 ºC. The results from the kinetic experiments showed that Cr3+ adsorbs slower than Ni2+. This behavior was explained by mea
Braz. J. Chem. Eng.. Publicado em: 2014-03
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33. Laboratory apparatus to evaluate microalgae production
The application of microalgae for energy purposes and CO2 biomitigation continues to present a number of challenges, including the optimization of culture conditions. The application of experimental designs for microalgae cultivation is difficult, since experiments involving such microorganisms generally last days or weeks. This work proposes a multipurpose
Braz. J. Chem. Eng.. Publicado em: 2013-09
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34. Production of clavulanic acid and cephamycin C by Streptomyces clavuligerus under different fed-batch conditions
The effect of carbon source and feeding conditions on the production of clavulanic acid (CA) and cephamycin C (CephC) by Streptomyces clavuligerus was investigated. In fed-batch experiments performed with glycerol feeding, production of CA exceeded that of CephC, and reached 1022 mg.L-1. Highest CephC production (566.5 mg.L-1) was obtained in fed-batch culti
Braz. J. Chem. Eng.. Publicado em: 2013-06
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35. Remoção de cromo (VI) de soluções aquosas utilizando o compósito magnético calcinado hidrotalcita-óxido de ferro: estudo cinético e de equilíbrio termodinâmico
In this work, hydrotalcite, a layered double hydroxide, had its ion exchange properties combined with the magnetic properties of iron oxide to produce a magnetic adsorbent, HT-Fe 500. These magnetic composites can be used as adsorbents for anionic contaminants in water and subsequently removed from the medium by a simple magnetic process. Removal of chromium
Quím. Nova. Publicado em: 2013
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36. Influence of pectin, glucose, and pH on the production of endo- and exo-polygalacturonase by Aspergillus oryzae in liquid medium
Endo-and exo-polygalacturonase (PG) production by Aspergillus oryzae IPT 301 was evaluated in a batch bioreactor in media containing 0, 10, and 20 g.L-1 pectin and 0 to 30 g.L-1 glucose. For cultivations in which the pH was not controlled, the use of 20 g.L-1 pectin and 10 g.L-1 glucose resulted in superior enzyme activities compared to control media with 0
Braz. J. Chem. Eng.. Publicado em: 2012-12