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 24 for “"Fuel ethanol"”.
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Granular Starch Hydrolysis for Fuel Ethanol Production
… pilot plant. Soft endosperm resulted in higher ethanol concentrations (at 72 hr) compared to ground corn or hard endosperm. Addition of urea increased ethanol concentrations (at 72 hr) for soft and hard endosperm. The effect of protease addition on increasing ethanol concentrations and …
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Engineering Zymomonas mobilis for efficient fuel ethanol production from lignocellulosic feedstocks
… is of interest for the commercial production of fuel ethanol from lignocellulosic feedstocks due to its high ethanol productivity. Z. mobilis has been engineered to ferment all of the sugars present in cellulosic biomass, but the digestion of five carbon sugars by the strain is still slow and …
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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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Steam Explosion Pretreatment of Cotton Gin Waste for Fuel Ethanol Production
… a feedstock to produce a value-added product - fuel ethanol. Cotton gin waste consists of pieces of burs, stems, motes (immature seeds) and cotton fiber, and is considered to be a lignocellulosic material. The three main chemical constituents are cellulose, hemicellulose, and lignin. Cellulose …
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Applications of alpha-amylase corn in the dry grind process for fuel ethanol production
Dry grind processing for fuel ethanol production from corn faces obstacles that limit profitability and sustainability. High temperatures required for liquefaction demand large thermal energy inputs and produce slurries with high final viscosities. These viscosity values increase power consumed by …
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Environmental and social dimensions of fuel ethanol production in Cradock, South Africa, in the context of the wider biofuels debate
Liquid biofuels are fossil fuel replacements in the form of fuel ethanol and biodiesel. Advocates of biofuels highlight their potential to mitigate climate change from reduced greenhouse gas emissions and socio-economic benefits for countries that achieve a higher degree of self-reliant energy …
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Production of Ethanol from Cereal Food Fines using Dilute-Acid Hydrolysis
… value as a feedstock for the production of fuel ethanol via fermentation. In order for this material to be fermented it has to be broken down in to simple sugars using hydrolysis. One method of hydrolysis is called dilute-acid hydrolysis, whereby low concentrations of acid are added to the …
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Evaluation of three heterologous xylose isomerase genes for the fermentation of plant biomass to bioethanol in Saccharomyces cerevisiae
… to explore renewable and sustainable replacement fuel sources. One candidate is plant biomass, although without modification its energy-rich sugars remain unavailable to the standard industrial yeast Saccharomyces cerevisiae for fermentation to the fuel ethanol. In this study, three xylose …
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Engineering antimicrobial strains of saccharomyces cerevisiae as industrial platform for non-sterile bioprocesses
Microbial contamination is a major challenge in fuel ethanol facilities, especially during the fermentation stage. Bacterial contaminants compete with yeast for fermentable sugars and nutrients, which obstructs starch to ethanol conversion. This leads to a reduction in ethanol yield. At large …
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An Economic Comparison of High Tunnel and Open-Field Strawberry Production in Southeastern Virginia and A Joint Estimation of Acreage Planted to U.S. Major Crops
… the effect of crop revenues, input costs, and fuel ethanol production on the joint acreages planted to eight U.S major crops (barley, corn, cotton, peanuts, rice, sorghum, soybeans, and wheat). We found a positive and statistically significant marginal effect of the expected peanuts' revenue on …
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Reducing the energy demand of bioethanol through salt extractive distillation enabled by electrodialysis
The expanded Renewable Fuel Standard (RFS2), established under the Energy Independence and Security Act (EISA) of 2007, mandates the production of 136.3 GL/year of renewable 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 …
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Bilateral U.S. Ethanol Trade with Canada and Brazil
<p>Global demand for fuel ethanol has increased significantly over the last decade. The U.S. was a net importer of ethanol until 2009. However, the U.S. has emerged as a net exporter since then. Accordingly, it is important to analyze the bilateral ethanol trade between U.S. and its major export …
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Optimization of sweet sorghum processing parameters
Production of fuel ethanol from renewable biomass sources has gained popularity in recent years. Sweet sorghum is one of the crops identified as an efficient producer of the sugars needed for ethanol production. The juice in the sweet sorghum pith contains the greatest proportion of nonstructural …
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Effects of temperature conditions and heat treatment within a multiple effect evaporator on thin stillage fouling characteristics
… and thus decreases processing efficiency. In the fuel ethanol industry, evaporator fouling occurs when thin stillage is concentrated. Fouling affects the efficiency and environmental footprint of more than 200 biorefineries in the US. Thin stillage is the liquid fraction of unfermented materials …
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Enzymatic Enhancement of Water Removal In the Dry Grind Corn to Ethanol Process
The removal of water from coproducts in the fuel ethanol process requires a significant energy input. The drying of the coproducts is responsible for as much as 32% of the total utilities cost of the process. In this study, improvements in the energy and water balances of the corn to ethanol …
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Risk of Milk Fat Depression for Dairy Cows Fed High Moisture Corn and Distillers Grains in Diets Containing Monensin
<p>Competition for com for fuel ethanol production and resulting increases in prices for com, is driving dairy producers towards using alternative ingredients to increase production efficiencies. Feeding distillers grains from com ethanol production provides a low-cost, nutrient dense alternative …
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Effects of AFEX Pretreatment, Denisifcation and Storage on Ethanol Yields of Corn Stover, Switchgrass and Prairie Cordgrass
… (PCG) were addressed as part of a cellulose-to-ethanol process. It is most cost-effective to transport densified cellulosic materials; however this can be cost prohibitive. AFEX pretreatment coupled with an innovative densification method allowed reduced costs per unit. Five conditions were …
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The application of ultrasound in the bioconversion of brewer’s and distiller’s spent grains to bioethanol
In recent years bioethanol (fuel ethanol derived through fermentation) has become the leading alternative to currently utilised liquid transportation fuels, possessing the benefits of being both sustainable and carbon neutral. If this position is to be maintained, it is clear that the feedstocks …
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Characteristics of heat transfer fouling of thin stillage using model thin stillage and evaporator concentrates
The US fuel ethanol demand was 50.3 billion liters (13.3 billion gallons) in 2012. Corn ethanol was produced primarily by dry grind process. Heat transfer equipment fouling occurs during corn ethanol production and increases the operating expenses of ethanol plants. Following ethanol distillation, …
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