Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 48 for “"Cellulosic Ethanol"”.
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Engineering Saccharomyces cerevisiae for cellulosic ethanol production
There are two long-existing obstacles for cellulosic ethanol production in Saccharomyces cerevisiae. The first one is inefficient xylose utilization and the second one is sequential fermentation of glucose and xylose in engineered Saccharomyces cerevisiae. This study mainly focused on solving these …
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Studies of Cellulosic Ethanol Production from Lignocellulose
… use of fossil fuels. Utilizing non-petroleum ethanol in the transportation sector reduces the dependence on oil, and allows for cleaner burning of gasoline. Lignocellulose materials are structurally composed of five types of polymeric sugars, glucan, galactan, mannan, arabinan, and xylan. NREL …
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Improving Brassica napus straw for cellulosic ethanol production
… necessarily produce higher saccharification or ethanol yields. Instead, variations in the non-cellulosic components were the most important differences between cultivars. Smaller scale methods were developed and rational conditions selected for screening In total, seventy-seven straw accessions …
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Use of treated effluent water in cellulosic ethanol production
The bioethanol industry exerts a significant demand on water supplies. Current water consumption rate in corn dry grind ethanol plants is 3 to 4 gallons of water per gallon of ethanol produced (gal/gal) and 6 to 10 gal/gal for cellulosic ethanol plants. The main goal of this study was to examine …
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Investigating biomass saccharification for the production of cellulosic ethanol
The production of second generation biofuels -- cellulosic ethanol from renewable lignocellulosic biomass has the potential to lead the bioindustrial revolution necessary to the transition from a fossil fuel-based economy to a sustainable carbohydrate economy. Effective release of fermentable …
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Life cycle analysis of hybrid poplar trees for cellulosic ethanol
… cultivating hybrid poplars as a biomass crop for cellulosic ethanol. A "Life Cycle Assessment" (LCA) methodology is used to systematically evaluate the hybrid poplar's energy input and output as well as greenhouse gas (GHG) emissions. The system boundary is divided into three sections, …
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Long term contracts and farm inflexibility premium in the production of cellulosic ethanol
… will supply the raw ingredients for the emerging cellulosic ethanol industry. The long-term relationship between a farmer and a processing firm is expected to be contractual. A processing firm has an incentive to sign long-term contracts to ensure a cost-efficient level of raw ingredient supply. …
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Prairie cordgrass as cellulosic ethanol feedstock and chemical hydrolysis with disk milling for pretreatment
Cellulosic ethanol plants have started operating at commercial scale; however, challenges related to feedstock supply and pretreatment efficiency still exist. To provide sufficient feedstock quantity, eleven natural populations of prairie cordgrass (Spartina pectinata L.) harvested in 2011 and 2012 …
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Reducing the energy demand of bioethanol through salt extractive distillation enabled by electrodialysis
… fuels in the U.S. in 2022: 56.8 GL/year of corn-ethanol, 60.6 GL/year of second generation biofuels such as cellulosic ethanol, and 18.9 GL/year of advanced biofuels such as biomass-based diesel. One of the several challenges when a biochemical conversion technique is used to produce bioethanol …
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Bio-energy system analysis: Profit, planet, and policy
… the economic feasibility of utilizing cellulosic biomass for ethanol as a strategy to decarbonize the transportation sector. However, it is mainly inhibited by the high cost. Chapter 4 investigates the concept of learning-by-doing (LBD) as a strategy to overcome the high cost. Several …
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Biofuels supply chain characterization
Ethanol can be made from agricultural residues like wheat straw and from crops dedicated to energy use, like switchgrass. We study the logistics aspects of this transformation and determine the main characteristics of the supply chain making ethanol from cellulose. Important to the final …
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Economies of scale analysis and location studies for fuel ethanol refineries
The development of commercial-scale cellulosic ethanol refineries is a challenging task, but it is a promising way to increase national energy independence and security. The main barrier to this development is high production costs. Biomass feedstock costs account for more than 30% of the total …
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Soil Carbon and Nitrogen Dynamics Across the Hillslope-Riparian Interface in Adjacent Watersheds with Contrasting Cellulosic Biofuel Systems
… research, particularly energy derived from cellulosic ethanol, which is derived from biomass such as wood and grass. Cellulosic ethanol demonstrates a more promising future as a global energy source than corn-derived ethanol because it does not displace food crops, irrigation is not …
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Economic analysis of biofuel production from Switchgrass (Panicum virgatum) and Sweet Sorghum (Sorghum bicolor) in the United States
… high dependence on foreign oil. Development of cellulosic feedstocks provides energy security and also reduces the burden on food crops like corn and sugarcane used for ethanol production. This thesis uses cost-benefit analysis to ascertain the profitability of producing cellulosic ethanol from …
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The grass is half-full : new biofuels from field to wheel
… market in the United States is dominated by ethanol made from corn. But corn ethanol has limitations that will prevent it from displacing a large amount of fossil fuel use in the U.S. To achieve that goal, biofuels will need to come from different sources. Cellulose, one of the main …
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Growing crops for biofuel and forage while conserving soil and water
The use of renewable feedstocks to produce cellulosic ethanol is quickly becoming a reality as facilities to produce cellulosic ethanol are scheduled to open in the upcoming years. Initial feedstocks for these facilities are thought to be crop residues such as corn (Zea mays L.) and wheat (Triticum …
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Performance of a multiple stage hot water pretreatment on sugarcane bagasse and its economic analysis
Cellulosic ethanol production has and continues to be widely investigated for commercial operation using corn stover and sugarcane bagasse. The lack of an effective and scalable pretreatment operation remains a major technical obstacle to wide spread commercialization. Combining multiple mild …
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Autohydrolysis of Miscanthus X giganteus for the production of xylooligosaccharides
… XOS can be a value added coproduct for the cellulosic ethanol industry. There is lack of information on the production of XOS in conjunction with cellulosic ethanol processes, especially with MxG. The objective of this study was to investigate the production, purification, characterization …
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Engineering robust yeast strains for the conversion of xylose derived from lignocellulosic biomass to xylitol
… bioproducts alongside high-volume, low-value cellulosic ethanol. This can be realised with the co-production of the low-calorie sugar substitute, xylitol which has a well-established market, as well as other chemicals. The construction of a xylitolproducing S. cerevisiae strain represents an …
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Modeling, Analysis, and Exact Algorithms for Some Biomass Logistics Supply Chain Design and Routing Problems
… problems arising in a switchgrass-based bio-ethanol supply chain encountered in the Southeast, and a corn stover harvest scheduling problem faced in the Midwest Unites States, both pertaining to the production of cellulosic ethanol. The main contributions of our work have been in introducing …
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