The Experts below are selected from a list of 35154 Experts worldwide ranked by ideXlab platform
Alba Silipo - One of the best experts on this subject based on the ideXlab platform.
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Zymomonas mobilis exopolysaccharide structure and role in high Ethanol tolerance.
Carbohydrate polymers, 2018Co-Authors: Mateusz Pallach, Roberta Marchetti, Flaviana Di Lorenzo, Antonio Fabozzi, Eric Giraud, Djamel Gully, Luigi Paduano, Antonio Molinaro, Gerardino D'errico, Alba SilipoAbstract:Bacterial cell surface exopolysaccharides (EPS) provide a protective barrier from the external milieu and participate in host-environment interactions. Zymomonas mobilis, an Ethanologenic Gram negative bacterium, is used by the industry in bio-Ethanol Production Process, due to its extraordinary resistance to a highly Ethanolic environment. We found that Z. mobilis produces a mixture of two EPSs, an [α-(1→6)-D-Manp] mannose homopolymer and a galactose containing polysaccharide: [→2)-β-D-Galf-(1→3)-β-D-Galp-(1→]n. A physico-chemical study, conducted with diffusion-ordered spectroscopy (DOSY) and Dynamic Light Scattering (DLS), allowed to demonstrate that, differently from the majority of polysaccharides, Ethanol is a good solvent for the galactose containing EPS, revealing that its chemical structure is specifically connected with the Zymomonas mobilis high Ethanol tolerance.
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Zymomonas mobilis exopolysaccharide structure and role in high Ethanol tolerance
Carbohydrate Polymers, 2018Co-Authors: Mateusz Pallach, Roberta Marchetti, Flaviana Di Lorenzo, Antonio Fabozzi, Eric Giraud, Djamel Gully, Luigi Paduano, Antonio Molinaro, Gerardino D’errico, Alba SilipoAbstract:Bacterial cell surface exopolysaccharides (EPS) provide a protective barrier from the external milieu and participate in host-environment interactions. Zymomonas mobilis, an Ethanologenic Gram negative bacterium, is used by the industry in bio-Ethanol Production Process, due to its extraordinary resistance to a highly Ethanolic environment. We found that Z. mobilis produces a mixture of two EPSs, an [alpha - (1 -> 6)-D-Manp] mannose homopolymer and a galactose containing polysaccharide: [-> 2)-beta-D-Galf-(1 -> 3)-beta-D-Galp-(1 ->](n). A physicochemical study, conducted with diffusion-ordered spectroscopy (DOSY) and Dynamic Light Scattering (DLS), allowed to demonstrate that, differently from the majority of polysaccharides, Ethanol is a good solvent for the galactose containing EPS, revealing that its chemical structure is specifically connected with the Zymomonas mobilis high Ethanol tolerance.
Maria Das Graças De Almeida Felipe - One of the best experts on this subject based on the ideXlab platform.
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effect of volumetric oxygen transfer coefficient kla on Ethanol Production performance by scheffersomyces stipitis on hemicellulosic sugarcane bagasse hydrolysate
Biochemical Engineering Journal, 2016Co-Authors: Débora Danielle Virgínio Da Silva, Silvio Silvério Da Silva, Kelly J. Dussán, Valentina Hernandez, Carlos A Cardona, Maria Das Graças De Almeida FelipeAbstract:Abstract Experimental evaluation of the effect of the agitation speed and aeration rate (measured by k L a) and energy required for Ethanol Production using sugarcane bagasse hemicellulosic hydrolysate (SBHH) by Scheffersomyces stipitis were studied. Fermentation and purification stages were simulated using the software Aspen Plus with experimental data to understand the overall energy performance of the Process. In all experiments, fermentative parameters and the thermal energy required in the Ethanol Production Process were strongly influenced by k L a values. The optimum initial k L a to achieve the maximal Ethanol concentration (15.03 g L −1 ) and the minimal thermal energy required (1.85 × 10 5 KW per kg Ethanol), were found at 8.0 h −1 (450 rpm and 0.6 vvm). Under this condition, the Ethanol yield and productivity were 0.37 g g −1 and 0.30 g L −1 h −1 , respectively. The current study highlights the Ethanol Production improvement from hemicellulose hydrolysate by S. stipitis and will contribute to developing a more efficient strategies for fermentation of both cellulose and hemicellulose hydrolysates.
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Effect of volumetric oxygen transfer coefficient (kLa) on Ethanol Production performance by Scheffersomyces stipitis on hemicellulosic sugarcane bagasse hydrolysate
Biochemical Engineering Journal, 2016Co-Authors: Débora Danielle Virgínio Da Silva, Silvio Silvério Da Silva, Kelly J. Dussán, Valentina Hernandez, Carlos A Cardona, Maria Das Graças De Almeida FelipeAbstract:Abstract Experimental evaluation of the effect of the agitation speed and aeration rate (measured by k L a) and energy required for Ethanol Production using sugarcane bagasse hemicellulosic hydrolysate (SBHH) by Scheffersomyces stipitis were studied. Fermentation and purification stages were simulated using the software Aspen Plus with experimental data to understand the overall energy performance of the Process. In all experiments, fermentative parameters and the thermal energy required in the Ethanol Production Process were strongly influenced by k L a values. The optimum initial k L a to achieve the maximal Ethanol concentration (15.03 g L −1 ) and the minimal thermal energy required (1.85 × 10 5 KW per kg Ethanol), were found at 8.0 h −1 (450 rpm and 0.6 vvm). Under this condition, the Ethanol yield and productivity were 0.37 g g −1 and 0.30 g L −1 h −1 , respectively. The current study highlights the Ethanol Production improvement from hemicellulose hydrolysate by S. stipitis and will contribute to developing a more efficient strategies for fermentation of both cellulose and hemicellulose hydrolysates.
Antonio Bonomi - One of the best experts on this subject based on the ideXlab platform.
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biorefineries for the Production of first and second generation Ethanol and electricity from sugarcane
Applied Energy, 2013Co-Authors: Marina O S Dias, Marcelo Pereira Da Cunha, Charles D F Jesus, Otávio Cavalett, Rubens Maciel Filho, Tassia L Junqueira, Lucas G Pavanello, Antonio BonomiAbstract:Sugarcane trash and bagasse, lignocellulosic materials obtained during sugarcane harvesting and Processing, may be used as fuels for electricity Production and/or as feedstock for second generation Ethanol. If electricity prices are favorable, more lignocellulosic material may be diverted for Production of steam and electricity, and vice versa when Ethanol prices are more attractive. Therefore, some flexibility to divert bagasse and trash for either second generation Ethanol or electricity Production might help to maximize revenues. An analysis of the integrated first and second generation Ethanol Production Process from sugarcane is presented, evaluating its flexibility. A flexible biorefinery may offer economic and environmental advantages over the conventional biorefineries with fixed Production capacity.
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improving second generation Ethanol Production through optimization of first generation Production Process from sugarcane
Energy, 2012Co-Authors: Marina O S Dias, Charles D F Jesus, Carlos Eduardo Vaz Rossell, Rubens Maciel Filho, Tassia L Junqueira, Antonio BonomiAbstract:Sugarcane bagasse and trash may be used as feedstock for second generation Ethanol Production. Production of second generation Ethanol integrated with first generation plants Processing sugarcane presents several advantages over the stand-alone second generation Ethanol Production Process; however, bagasse is used as fuel to supply the energy demand of the first generation Process, so the amount of bagasse and trash available for use as feedstock in second generation depends on the energy consumption of the integrated Process. Therefore, Process optimization leading to reduction in steam consumption will lead to the Production of larger amounts of surplus bagasse. In this study the introduction of Process improvements in the first generation autonomous distillery Processing sugarcane were assessed through simulation using Aspen Plus. Second generation Ethanol Production was integrated to the optimized scenarios. Results show that Process improvements can significantly increase the amount of lignocellulosic material available for use as feedstock for second generation Ethanol Production, thus increasing Ethanol Production.
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integrated versus stand alone second generation Ethanol Production from sugarcane bagasse and trash
Bioresource Technology, 2012Co-Authors: Marina O S Dias, Marcelo Pereira Da Cunha, Charles D F Jesus, Carlos Eduardo Vaz Rossell, Otávio Cavalett, Tassia Lopes Junqueira, Rubens Maciel Filho, Antonio BonomiAbstract:Abstract Ethanol Production from lignocellulosic materials is often conceived considering independent, stand-alone Production plants; in the Brazilian scenario, where part of the potential feedstock (sugarcane bagasse) for second generation Ethanol Production is already available at conventional first generation Production plants, an integrated first and second generation Production Process seems to be the most obvious option. In this study stand-alone second generation Ethanol Production from surplus sugarcane bagasse and trash is compared with conventional first generation Ethanol Production from sugarcane and with integrated first and second generation; simulations were developed to represent the different technological scenarios, which provided data for economic and environmental analysis. Results show that the integrated first and second generation Ethanol Production Process from sugarcane leads to better economic results when compared with the stand-alone plant, especially when advanced hydrolysis technologies and pentoses fermentation are included.
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simulation of integrated first and second generation bioEthanol Production from sugarcane comparison between different biomass pretreatment methods
Journal of Industrial Microbiology & Biotechnology, 2011Co-Authors: Marina O S Dias, Charles D F Jesus, Antonio Bonomi, Rubens Maciel Filho, Marcelo P Cunha, Carlos Eduardo Vaz RossellAbstract:Sugarcane bagasse is used as a fuel in conventional bioEthanol Production, providing heat and power for the plant; therefore, the amount of surplus bagasse available for use as raw material for second generation bioEthanol Production is related to the energy consumption of the bioEthanol Production Process. Pentoses and lignin, byproducts of the second generation bioEthanol Production Process, may be used as fuels, increasing the amount of surplus bagasse. In this work, simulations of the integrated bioEthanol Production Process from sugarcane, surplus bagasse and trash were carried out. Selected pre-treatment methods followed, or not, by a delignification step were evaluated. The amount of lignocellulosic materials available for hydrolysis in each configuration was calculated assuming that 50% of sugarcane trash is recovered from the field. An economic risk analysis was carried out; the best results for the integrated first and second generation Ethanol Production Process were obtained for steam explosion pretreatment, high solids loading for hydrolysis and 24–48 h hydrolysis. The second generation Ethanol Production Process must be improved (e.g., decreasing required investment, improving yields and developing pentose fermentation to Ethanol) in order for the integrated Process to be more economically competitive.
Douglas G. Tiffany - One of the best experts on this subject based on the ideXlab platform.
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FUEL PROPERTIES OF BIOMASS FEED STREAMS AT Ethanol PLANTS
2014Co-Authors: R. Vance Morey, Dennis L. Hatfield, Rod Sears, Douglas G. Tiffany, D. Haak, N. KaliyanAbstract:ABSTRACT. Biomass co‐products from the dry‐grind Ethanol Production Process and/or corn stover are potential sources for the energy needed to operate the plant. The Ethanol plant co‐products alone contain sufficient energy to meet the electrical and thermal needs of the plant as well as to produce excess power that can be sold. Fuel characteristics of co‐products of the Ethanol dry‐grind Process [distillers wet grains (DWG), concentrated distillers solubles (referred to as “syrup”), and distillers dried grains with solubles (DDGS)], and corn stover are evaluated. Analyses include proximate, ultimate, selected metals, ash fusion temperatures, minerals in the ash, and thermogravimetric analysis (TGA). Higher heating values for the co‐products are greater than for corn stover and for most other biomass materials. The Ethanol co‐products contain large amounts of nitrogen, sulfur, and chlorine, which will require major control technologies for combustion or gasification systems to meet emissions limits. The alkali metal content (potassium and sodium oxides) of the ash is high (22 % to 34%) for co‐products and corn stover, which will require careful design to avoid to ash fouling in combustion and steam generation units. Corn stover has more favorable combustion characteristics than the Ethanol co‐products based on higher ash fusion temperatures and the TGA results (higher combustion reactivity and lower burnout temperature)
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biomass integrated gasification combined cycle for heat and power at Ethanol plants
Energy Conversion and Management, 2009Co-Authors: Matthew J De Kam, Vance R Morey, Douglas G. TiffanyAbstract:Abstract Biomass Integrated Gasification Combined Cycle (BIGCC) technology can be used to generate Process heat and significant amounts of electricity at dry-grind Ethanol facilities by utilizing the Ethanol Process co-products and other biomass sources. These systems can reduce fuel costs for Ethanol plants, improve the renewable energy balance of dry-grind Ethanol Production, and provide reliable renewable electricity for Process use and for sale to the local utility. An Aspen Plus model of the dry-grind Ethanol Process is used as the basis for a subsequent gasification system model. A twin fluidized bed steam gasification configuration based on the SilvaGas Process is used to generate synthesis gas. The results show that a dry-grind Ethanol facility with a capacity of 190 million liters per year could produce 30.4 MWe of power while supplying all its Process heat needs using Ethanol co-products and corn cobs. This configuration results in a three fold improvement in the amount of renewable energy produced per unit of fossil energy used compared to a conventional Ethanol Production Process using natural gas.
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biomass integrated gasification combined cycle for heat and power at Ethanol plants
American Society of Agricultural and Biological Engineers Annual International Meeting 2008, 2008Co-Authors: Matthew J De Kam, Vance R Morey, Douglas G. TiffanyAbstract:Biomass integrated gasification combined cycle (BIGCC) technology can be used to generate Process heat and significant amounts of electricity at dry-grind Ethanol facilities by utilizing the Ethanol Process coproducts and other biomass sources. These systems can reduce fuel costs for Ethanol plants, improve the renewable energy balance of dry-grind Ethanol Production, and provide reliable renewable electricity for Process use and for sale to the local utility. An Aspen Plus model of the dry-grind Ethanol Process is used as the basis for a subsequent gasification system model. A twin fluidized bed steam gasification configuration based on the SilvaGas Process is used to generate synthesis gas. The results show that a dry-grind Ethanol facility with a capacity of 190 million liters (50 million gallons) per year could produce 30.4 MW of power while supplying all its Process heat needs using Ethanol coproducts and corn cobs. This configuration results in a three fold improvement in the amount of renewable energy produced per unit of fossil energy used compared to a conventional Ethanol Production Process using natural gas.
Marina O S Dias - One of the best experts on this subject based on the ideXlab platform.
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biorefineries for the Production of first and second generation Ethanol and electricity from sugarcane
Applied Energy, 2013Co-Authors: Marina O S Dias, Marcelo Pereira Da Cunha, Charles D F Jesus, Otávio Cavalett, Rubens Maciel Filho, Tassia L Junqueira, Lucas G Pavanello, Antonio BonomiAbstract:Sugarcane trash and bagasse, lignocellulosic materials obtained during sugarcane harvesting and Processing, may be used as fuels for electricity Production and/or as feedstock for second generation Ethanol. If electricity prices are favorable, more lignocellulosic material may be diverted for Production of steam and electricity, and vice versa when Ethanol prices are more attractive. Therefore, some flexibility to divert bagasse and trash for either second generation Ethanol or electricity Production might help to maximize revenues. An analysis of the integrated first and second generation Ethanol Production Process from sugarcane is presented, evaluating its flexibility. A flexible biorefinery may offer economic and environmental advantages over the conventional biorefineries with fixed Production capacity.
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improving second generation Ethanol Production through optimization of first generation Production Process from sugarcane
Energy, 2012Co-Authors: Marina O S Dias, Charles D F Jesus, Carlos Eduardo Vaz Rossell, Rubens Maciel Filho, Tassia L Junqueira, Antonio BonomiAbstract:Sugarcane bagasse and trash may be used as feedstock for second generation Ethanol Production. Production of second generation Ethanol integrated with first generation plants Processing sugarcane presents several advantages over the stand-alone second generation Ethanol Production Process; however, bagasse is used as fuel to supply the energy demand of the first generation Process, so the amount of bagasse and trash available for use as feedstock in second generation depends on the energy consumption of the integrated Process. Therefore, Process optimization leading to reduction in steam consumption will lead to the Production of larger amounts of surplus bagasse. In this study the introduction of Process improvements in the first generation autonomous distillery Processing sugarcane were assessed through simulation using Aspen Plus. Second generation Ethanol Production was integrated to the optimized scenarios. Results show that Process improvements can significantly increase the amount of lignocellulosic material available for use as feedstock for second generation Ethanol Production, thus increasing Ethanol Production.
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integrated versus stand alone second generation Ethanol Production from sugarcane bagasse and trash
Bioresource Technology, 2012Co-Authors: Marina O S Dias, Marcelo Pereira Da Cunha, Charles D F Jesus, Carlos Eduardo Vaz Rossell, Otávio Cavalett, Tassia Lopes Junqueira, Rubens Maciel Filho, Antonio BonomiAbstract:Abstract Ethanol Production from lignocellulosic materials is often conceived considering independent, stand-alone Production plants; in the Brazilian scenario, where part of the potential feedstock (sugarcane bagasse) for second generation Ethanol Production is already available at conventional first generation Production plants, an integrated first and second generation Production Process seems to be the most obvious option. In this study stand-alone second generation Ethanol Production from surplus sugarcane bagasse and trash is compared with conventional first generation Ethanol Production from sugarcane and with integrated first and second generation; simulations were developed to represent the different technological scenarios, which provided data for economic and environmental analysis. Results show that the integrated first and second generation Ethanol Production Process from sugarcane leads to better economic results when compared with the stand-alone plant, especially when advanced hydrolysis technologies and pentoses fermentation are included.
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simulation of integrated first and second generation bioEthanol Production from sugarcane comparison between different biomass pretreatment methods
Journal of Industrial Microbiology & Biotechnology, 2011Co-Authors: Marina O S Dias, Charles D F Jesus, Antonio Bonomi, Rubens Maciel Filho, Marcelo P Cunha, Carlos Eduardo Vaz RossellAbstract:Sugarcane bagasse is used as a fuel in conventional bioEthanol Production, providing heat and power for the plant; therefore, the amount of surplus bagasse available for use as raw material for second generation bioEthanol Production is related to the energy consumption of the bioEthanol Production Process. Pentoses and lignin, byproducts of the second generation bioEthanol Production Process, may be used as fuels, increasing the amount of surplus bagasse. In this work, simulations of the integrated bioEthanol Production Process from sugarcane, surplus bagasse and trash were carried out. Selected pre-treatment methods followed, or not, by a delignification step were evaluated. The amount of lignocellulosic materials available for hydrolysis in each configuration was calculated assuming that 50% of sugarcane trash is recovered from the field. An economic risk analysis was carried out; the best results for the integrated first and second generation Ethanol Production Process were obtained for steam explosion pretreatment, high solids loading for hydrolysis and 24–48 h hydrolysis. The second generation Ethanol Production Process must be improved (e.g., decreasing required investment, improving yields and developing pentose fermentation to Ethanol) in order for the integrated Process to be more economically competitive.