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Steve Rosenberg - One of the best experts on this subject based on the ideXlab platform.
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a novel low grade heat driven Process to re concentrate Process liquor in alumina refineries
Hydrometallurgy, 2017Co-Authors: Bijan Rahimi, Klaus Regenauerlieb, Hui Tong Chua, Eric Boom, Silvio Nicoli, Steve RosenbergAbstract:Abstract Evaporation is an essential Process in alumina refineries both to produce water for such applications as residue washing Processes, and re-concentrating Process liquor back to the main Process circuit for further digestion. This article reports on the application of a re-Concentration Process driven by low grade heat. It couples flash and falling film evaporation, fed by a low-grade heat source, to recover heat and concentrate Process liquor. Process condensate is the stream used for this evaluation. The condenser of the re-Concentration Process is cooled barometrically by water from the recovery lake. The freshwater generated is either discharged or sent to the freshwater lake so as to manage the water balance of a refinery. For 200 m 3 /h Process condensate simulated at two fixed temperatures of 75 °C and 85 °C, the Process generates up to 36% more re-concentrated Process liquor, and about 10% less specific capital cost compared to the conventional multi effect falling film evaporation system.
Hui Tong Chua - One of the best experts on this subject based on the ideXlab platform.
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a novel low grade heat driven Process to re concentrate Process liquor in alumina refineries
Hydrometallurgy, 2017Co-Authors: Bijan Rahimi, Klaus Regenauerlieb, Hui Tong Chua, Eric Boom, Silvio Nicoli, Steve RosenbergAbstract:Abstract Evaporation is an essential Process in alumina refineries both to produce water for such applications as residue washing Processes, and re-concentrating Process liquor back to the main Process circuit for further digestion. This article reports on the application of a re-Concentration Process driven by low grade heat. It couples flash and falling film evaporation, fed by a low-grade heat source, to recover heat and concentrate Process liquor. Process condensate is the stream used for this evaluation. The condenser of the re-Concentration Process is cooled barometrically by water from the recovery lake. The freshwater generated is either discharged or sent to the freshwater lake so as to manage the water balance of a refinery. For 200 m 3 /h Process condensate simulated at two fixed temperatures of 75 °C and 85 °C, the Process generates up to 36% more re-concentrated Process liquor, and about 10% less specific capital cost compared to the conventional multi effect falling film evaporation system.
R Wieler - One of the best experts on this subject based on the ideXlab platform.
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the genesis solar wind concentrator target mass fractionation characterised by neon isotopes
Space Science Reviews, 2007Co-Authors: V S Heber, R C Wiens, D B Reisenfeld, J H Allton, H Baur, D S Burnett, C T Olinger, U Wiechert, R WielerAbstract:The concentrator on Genesis provided samples of increased fluences of solar wind ions for precise determination of the oxygen isotopic composition. The Concentration Process caused mass fractionation as a function of the radial target position. This fractionation was measured using Ne released by UV laser ablation and compared with modelled Ne data, obtained from ion-trajectory simulations. Measured data show that the concentrator performed as expected and indicate a radially symmetric Concentration Process. Measured Concentration factors are up to ∼30 at the target centre. The total range of isotopic fractionation along the target radius is 3.8%/amu, with monotonically decreasing 20Ne/22Ne towards the centre, which differs from model predictions. We discuss potential reasons and propose future attempts to overcome these disagreements.
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mass fractionation induced by the genesis solar wind concentrator analysis of neon isotopes by uv laser ablation
Meteoritics and Planetary Science Supplement, 2006Co-Authors: V S Heber, R C Wiens, H Baur, D S Burnett, C T Olinger, U Wiechert, R WielerAbstract:The solar wind (SW) concentrator, a key instrument onboard the Genesis mission, was designed to provide larger fluences of implanted SW for precise isotope analyses of oxygen and nitrogen [1]. SW ions in the mass range 4–28 amu were accelerated and focused on a “concentrator target” by an electrostatic mirror. This Concentration Process caused some instrumental mass fractionation of the implanted SW ions as function of the radial position on the target. Correction of this fractionation will be based on a combination of the measured radial fractionation of Ne isotopes with results of simulations of the implantation Process using the actual performance of the concentrator and the SW conditions during exposure. Here we present He and Ne abundance and Ne isotopic composition data along one arm of the gold cross that framed the 4 concentrator subtargets.
Gyula Vatai - One of the best experts on this subject based on the ideXlab platform.
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the effect of pre treatment on the anthocyanin and flavonol content of black currant juice ribes nigrum l in Concentration by reverse osmosis
Journal of Food Engineering, 2010Co-Authors: Nora Pap, Eva Pongracz, Mari Jaakkola, Vesa Virtanen, Gyula Vatai, Tiina Tolonen, Auli Turkki, Zsuzsanna Horvathhovorka, Riitta L KeiskiAbstract:Abstract Reverse osmosis Process for the Concentration of black currant juice was carried using AFC-99 tubular membrane at 30 °C and 45 bar. The contents of selected flavonols and anthocyanins were analyzed after centrifugation; enzyme treatment by Panzym Super E and by Rohapect berry followed by centrifugation; and ultrafiltration black currant juices and juice concentrates. The total soluble solid (TSS) content of the juices increased from the initial 17.6–17.9 °Brix to 24–24.8 °Brix in the case of the centrifuged juice in the Concentration Process. Similarly, it increased from 14.5–15.5 °Brix to 23.1–23.4 °Brix for the Panzym Super E treated juice, and from 16.1–16.9 °Brix to 22.5–23.1 °Brix for the Rohapect berry treated black currant juices. The ultrafiltered juice had the lowest initial TSS content between 14.1 and 14.9 °Brix and it increased to 22.1–23.1 °Brix. The average permeate fluxes during the Concentration Process were 7.3 L m−2 h−1 for the centrifuged juice, 11.9 L m−2 h−1 for the Panzym Super E treated juice, 9.2 and 13.1 L m−2 h−1 for the Rohapect berry treated and ultrafiltered juice, respectively. Analysis indicated that the enzymatic treatment resulted in the increase of anthocyanin and flavonol content of the juices. The centrifugation Process decreased the amount of anthocyanins and flavonols to some extent. The juice clarified by ultrafiltration had significantly lower Concentrations of anthocyanins and flavonols, while the juices treated by Panzym Super E had the highest levels of these flavonoids. This study recommends enzymatic pre-treatment by Panzym Super E, since it improves the permeate flux in reverse osmosis during the Concentration Process, and results in a juice concentrates highest in anthocyanins and flavonols.
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production of black currant juice concentrate by using membrane distillation
Desalination, 2009Co-Authors: Aro Kozak, Erika Ekassymolna, Gyula VataiAbstract:Abstract In this study the applicability of membrane distillation (MD) was investigated to produce black-currant juice concentrate. For the experiments enzyme treated, pre-filtered by microfiltration and pre-concentrated by reverse osmosis fruit juice was applied. The measurements were carried out in a hollow fibre membrane contactor. Two different temperature differences were investigated as driving force: 15 and 19 °C. The shape of the curves of the fluxes appeared very similar at both temperature differences, however in case of the higher driving force the observed flux was 80% higher than in case of the lower driving force. By the MD Process the pre-treated initial juice with 22°Brix total soluble solid (TSS) content was concentrated up to 58.2°Brix. Samples were collected during the Concentration Process and the density, total acid content (TAC) and anthocyanin content were measured. From the results it can be concluded that all the analysed parameters were directly proportional to the increase of the TSS in the juice. Due to the increase of the TAC the pH of the final Concentration decreased under pH = 2.
Prudêncio, Elane Schwinden - One of the best experts on this subject based on the ideXlab platform.
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Optimization of goat milk vacuum-assisted block freeze Concentration using responsesurface methodology and NaCl addition i
2020Co-Authors: Machado Canella, Maria Helena, Dantas Adriana, Blanco Abellán Mónica, Raventós Santamaria Mercè, Hernández Yáñez Eduard, Prudêncio, Elane SchwindenAbstract:Response Surface Methodology was applied to optimize the effects of freezing time, vacuum conditions, and time under vacuum regarding concentrated yield response, resulting from optimal parameters of the milk vacuum-assisted block freeze Concentration Process. Additionally, it was verified the NaCl influence, using different salt contents (0.5, 1, 1.5, and 2%) addition and freezing time of 1 day, vacuum equal to 10 kPa, and time under vacuum 60 min, in goat milk vacuum-assisted freeze Concentration performance
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Optimization of goat milk vacuum-assisted block freeze Concentration using responsesurface methodology and NaCl addition i
'Elsevier BV', 2020Co-Authors: Machado Canella, Maria Helena, Dantas Adriana, Blanco Abellán Mónica, Raventós Santamaria Mercè, Hernández Yáñez Eduard, Prudêncio, Elane SchwindenAbstract:Response Surface Methodology was applied to optimize the effects of freezing time, vacuum conditions, and time under vacuum regarding concentrated yield response, resulting from optimal parameters of the milk vacuum-assisted block freeze Concentration Process. Additionally, it was verified the NaCl influence, using different salt contents (0.5, 1, 1.5, and 2%) addition and freezing time of 1 day, vacuum equal to 10 kPa, and time under vacuum 60 min, in goat milk vacuum-assisted freeze Concentration performance.Postprint (updated version