The Experts below are selected from a list of 45153 Experts worldwide ranked by ideXlab platform
J.r. Portela - One of the best experts on this subject based on the ideXlab platform.
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Hydrogen production by supercritical water gasification of black liquor: Use of high temperatures and short residence times in a Continuous Reactor
The Journal of Supercritical Fluids, 2020Co-Authors: P. Casademont, Lúcio Cardozo-filho, J. Sánchez-oneto, A.p.j. Scandelai, J.r. PortelaAbstract:Abstract The Supercritical Water Gasification (SCWG) of black liquor (BL) to obtain hydrogen and dispose of organic waste simultaneously has been studied in a Continuous Reactor employing short residence times. The experiments were conducted at 600–700 °C, with times between 24.5–29.1 s, at 23 MPa and feedstock was diluted to different concentration levels (0.81–2.43 wt.%). Furthermore, different NaOH concentrations (0–1.2 wt.%) were added to maintain a basic medium and avoid the polymerization of the compounds. Hydrogen production and COD removal was conducted with short residence times. The best results regarding hydrogen yield were achieved at 700 °C, 24.5 s residence time and 0.9 wt.% NaOH concentration, with a production of 38.68 mol H2/kgsample. In contrast, and regarding COD removal, the best results were obtained at 700 °C, with 24.5 s residence time and the highest feed COD concentration used (2.43 wt.%). The COD removal levels reached were between 65–90 %.
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Gasification of olive oil mill waste by supercritical water in a Continuous Reactor
The Journal of Supercritical Fluids, 2018Co-Authors: P. Casademont, Lúcio Cardozo-filho, E. Meurer, J. Sánchez-oneto, J.r. PortelaAbstract:Abstract Supercritical Water Gasification (SCWG) is an emerging technology with a great potential to recycle biomass and/or biomass residues and to produce hydrogen-rich gas. SCWG of Olive Oil Mill Waste (OMW) in a Continuous Reactor at highs waste concentration (7.1–23.5 gO2/l) and temperature (550–700 °C) had never been studied before. With a residence time ranged between 14.6–52.8 s, the hydrogen yields as well as the removal of Total Organic Carbon (TOC) and Chemical Oxygen Demand (COD) were quantified. As expected from the literature and thermodynamic analysis, the most favourable experimental conditions for H2 production were the maximum temperature used, 700 °C, the longest residence time tested, 40.8 s, and the lowest initial COD, 7.8 ± 0.1 gO2/l, obtaining 112.5 ± 6.2 mol H2/kgOMW dry, which is higher than those obtained in from other biomass wastes in similar studies. Finally, different intermediate reaction routes for the processing of OMW by SCWG were suggested.
P. Casademont - One of the best experts on this subject based on the ideXlab platform.
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Hydrogen production by supercritical water gasification of black liquor: Use of high temperatures and short residence times in a Continuous Reactor
The Journal of Supercritical Fluids, 2020Co-Authors: P. Casademont, Lúcio Cardozo-filho, J. Sánchez-oneto, A.p.j. Scandelai, J.r. PortelaAbstract:Abstract The Supercritical Water Gasification (SCWG) of black liquor (BL) to obtain hydrogen and dispose of organic waste simultaneously has been studied in a Continuous Reactor employing short residence times. The experiments were conducted at 600–700 °C, with times between 24.5–29.1 s, at 23 MPa and feedstock was diluted to different concentration levels (0.81–2.43 wt.%). Furthermore, different NaOH concentrations (0–1.2 wt.%) were added to maintain a basic medium and avoid the polymerization of the compounds. Hydrogen production and COD removal was conducted with short residence times. The best results regarding hydrogen yield were achieved at 700 °C, 24.5 s residence time and 0.9 wt.% NaOH concentration, with a production of 38.68 mol H2/kgsample. In contrast, and regarding COD removal, the best results were obtained at 700 °C, with 24.5 s residence time and the highest feed COD concentration used (2.43 wt.%). The COD removal levels reached were between 65–90 %.
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Gasification of olive oil mill waste by supercritical water in a Continuous Reactor
The Journal of Supercritical Fluids, 2018Co-Authors: P. Casademont, Lúcio Cardozo-filho, E. Meurer, J. Sánchez-oneto, J.r. PortelaAbstract:Abstract Supercritical Water Gasification (SCWG) is an emerging technology with a great potential to recycle biomass and/or biomass residues and to produce hydrogen-rich gas. SCWG of Olive Oil Mill Waste (OMW) in a Continuous Reactor at highs waste concentration (7.1–23.5 gO2/l) and temperature (550–700 °C) had never been studied before. With a residence time ranged between 14.6–52.8 s, the hydrogen yields as well as the removal of Total Organic Carbon (TOC) and Chemical Oxygen Demand (COD) were quantified. As expected from the literature and thermodynamic analysis, the most favourable experimental conditions for H2 production were the maximum temperature used, 700 °C, the longest residence time tested, 40.8 s, and the lowest initial COD, 7.8 ± 0.1 gO2/l, obtaining 112.5 ± 6.2 mol H2/kgOMW dry, which is higher than those obtained in from other biomass wastes in similar studies. Finally, different intermediate reaction routes for the processing of OMW by SCWG were suggested.
Yukihiko Matsumura - One of the best experts on this subject based on the ideXlab platform.
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Supercritical water gasification of sewage sludge in Continuous Reactor.
Bioresource technology, 2017Co-Authors: Apip Amrullah, Yukihiko MatsumuraAbstract:Abstract In this study, a process for the Continuous recovery of phosphorus and generation of gas from sewage sludge is investigated for the first time using supercritical water gasification (SCWG). A Continuous Reactor was employed and experiments were conducted by varying the temperature (500–600 °C) and residence time (5–60 s) while fixing the pressure at 25 MPa. The behavior of phosphorus during the SCWG process was studied. The effect of the temperature and time on the composition of the product gas was also investigated. A model of the reaction kinetics for the SCWG of sewage sludge was developed. The organic phosphorus (OP) was rapidly converted into inorganic phosphorus (IP) within a short residence time of 10 s. The gaseous products were mainly composed of H2, CO2, and CH4. The reaction followed first order kinetics, and the model was found to fit the experimental data well.
Lúcio Cardozo-filho - One of the best experts on this subject based on the ideXlab platform.
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Hydrogen production by supercritical water gasification of black liquor: Use of high temperatures and short residence times in a Continuous Reactor
The Journal of Supercritical Fluids, 2020Co-Authors: P. Casademont, Lúcio Cardozo-filho, J. Sánchez-oneto, A.p.j. Scandelai, J.r. PortelaAbstract:Abstract The Supercritical Water Gasification (SCWG) of black liquor (BL) to obtain hydrogen and dispose of organic waste simultaneously has been studied in a Continuous Reactor employing short residence times. The experiments were conducted at 600–700 °C, with times between 24.5–29.1 s, at 23 MPa and feedstock was diluted to different concentration levels (0.81–2.43 wt.%). Furthermore, different NaOH concentrations (0–1.2 wt.%) were added to maintain a basic medium and avoid the polymerization of the compounds. Hydrogen production and COD removal was conducted with short residence times. The best results regarding hydrogen yield were achieved at 700 °C, 24.5 s residence time and 0.9 wt.% NaOH concentration, with a production of 38.68 mol H2/kgsample. In contrast, and regarding COD removal, the best results were obtained at 700 °C, with 24.5 s residence time and the highest feed COD concentration used (2.43 wt.%). The COD removal levels reached were between 65–90 %.
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Gasification of olive oil mill waste by supercritical water in a Continuous Reactor
The Journal of Supercritical Fluids, 2018Co-Authors: P. Casademont, Lúcio Cardozo-filho, E. Meurer, J. Sánchez-oneto, J.r. PortelaAbstract:Abstract Supercritical Water Gasification (SCWG) is an emerging technology with a great potential to recycle biomass and/or biomass residues and to produce hydrogen-rich gas. SCWG of Olive Oil Mill Waste (OMW) in a Continuous Reactor at highs waste concentration (7.1–23.5 gO2/l) and temperature (550–700 °C) had never been studied before. With a residence time ranged between 14.6–52.8 s, the hydrogen yields as well as the removal of Total Organic Carbon (TOC) and Chemical Oxygen Demand (COD) were quantified. As expected from the literature and thermodynamic analysis, the most favourable experimental conditions for H2 production were the maximum temperature used, 700 °C, the longest residence time tested, 40.8 s, and the lowest initial COD, 7.8 ± 0.1 gO2/l, obtaining 112.5 ± 6.2 mol H2/kgOMW dry, which is higher than those obtained in from other biomass wastes in similar studies. Finally, different intermediate reaction routes for the processing of OMW by SCWG were suggested.
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Optimization of Catalytic Glycerol Etherification with Ethanol in a Continuous Reactor
Energy & Fuels, 2017Co-Authors: Caroline Ortega Terra Lemos, Letícia Leandro Rade, Marcos A.s. Barrozo, Lindoval D. Fernandes, Lúcio Cardozo-filho, Carla E. HoriAbstract:In the past few decades, biodiesel has emerged as a promising renewable energy source. However, its production usually leads to the formation of large amounts of glycerol as a byproduct. This article reports the evaluation of catalytic glycerol etherification with ethanol over a series of catalysts in a Continuous Reactor. Amberlyst 15 presented the best performance in terms of glycerol conversion and yield of ethers. This result was attributed to its high pore size and acidity. Beta zeolite (Si/Al = 12.5) and niobic acid, both with lower acid strengths and pore sizes, were almost inactive in the conversion of glycerol into ethers. A central composite design was developed to optimize the performance of Amberlyst 15. An increase in catalyst amount enhanced both the glycerol conversion and the yield of ethers. However, high temperatures and low molar ratios favored side reactions. The optimized value for glycerol conversion was 91%, and that for the yield of ethers was 13%, under different reaction conditions.
J. Sánchez-oneto - One of the best experts on this subject based on the ideXlab platform.
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Hydrogen production by supercritical water gasification of black liquor: Use of high temperatures and short residence times in a Continuous Reactor
The Journal of Supercritical Fluids, 2020Co-Authors: P. Casademont, Lúcio Cardozo-filho, J. Sánchez-oneto, A.p.j. Scandelai, J.r. PortelaAbstract:Abstract The Supercritical Water Gasification (SCWG) of black liquor (BL) to obtain hydrogen and dispose of organic waste simultaneously has been studied in a Continuous Reactor employing short residence times. The experiments were conducted at 600–700 °C, with times between 24.5–29.1 s, at 23 MPa and feedstock was diluted to different concentration levels (0.81–2.43 wt.%). Furthermore, different NaOH concentrations (0–1.2 wt.%) were added to maintain a basic medium and avoid the polymerization of the compounds. Hydrogen production and COD removal was conducted with short residence times. The best results regarding hydrogen yield were achieved at 700 °C, 24.5 s residence time and 0.9 wt.% NaOH concentration, with a production of 38.68 mol H2/kgsample. In contrast, and regarding COD removal, the best results were obtained at 700 °C, with 24.5 s residence time and the highest feed COD concentration used (2.43 wt.%). The COD removal levels reached were between 65–90 %.
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Gasification of olive oil mill waste by supercritical water in a Continuous Reactor
The Journal of Supercritical Fluids, 2018Co-Authors: P. Casademont, Lúcio Cardozo-filho, E. Meurer, J. Sánchez-oneto, J.r. PortelaAbstract:Abstract Supercritical Water Gasification (SCWG) is an emerging technology with a great potential to recycle biomass and/or biomass residues and to produce hydrogen-rich gas. SCWG of Olive Oil Mill Waste (OMW) in a Continuous Reactor at highs waste concentration (7.1–23.5 gO2/l) and temperature (550–700 °C) had never been studied before. With a residence time ranged between 14.6–52.8 s, the hydrogen yields as well as the removal of Total Organic Carbon (TOC) and Chemical Oxygen Demand (COD) were quantified. As expected from the literature and thermodynamic analysis, the most favourable experimental conditions for H2 production were the maximum temperature used, 700 °C, the longest residence time tested, 40.8 s, and the lowest initial COD, 7.8 ± 0.1 gO2/l, obtaining 112.5 ± 6.2 mol H2/kgOMW dry, which is higher than those obtained in from other biomass wastes in similar studies. Finally, different intermediate reaction routes for the processing of OMW by SCWG were suggested.