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 21 for “"acid gas"”.
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Acid gas removal from natural gas using ionic liquids
The growth in demand for natural gas accounted for almost half the increase in global energy consumption in 2018 and is projected to increase by more than 10% over the next five years. This is due to its abundancy, efficiency and lower carbon content compared to oil and coal. However, raw gas …
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Processes Involving Acid Gas Solubility In Room Temperature Ionic Liquids (RTILs)
… studies involving the solubility of acid gases in RTILs. This thesis looks at using these studies in the context of two processes: membrane separation and absorption refrigeration cycles. The first part of this study investigated the separation of a mixed dry gas feed of CO2/CH4 by …
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Performance of Acid-Gas Anaerobic Digestion for Minimization of Siloxane and Hydrogen Sulfide Produced in Biogas for Energy Recovery
… these compounds volatilize and enter the methane gas recovery stream. As the methane is combusted for energy cogeneration, these compounds become oxidized to microcrystalline silicon dioxide and cause damage and potential failure of expensive infrastructure. Adsorption and other catchment methods …
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Implementation of Acid/Gas Digestion Approach to Maximize Volatile Fatty Acids Production from Municipal Sludge and a Techno-economic Feasibility Study
<p>Acid digestion, which is the first step of two-phase acid/gas anaerobic digestion process, was studied to identify the optimum operating conditions that would maximize the production of volatile fatty acids (VFAs). Batch and semi-continuous acid digesters were operated using combined primary …
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Design and Optimization of Post-Combustion CO2 Capture
… amines to remove of carbon dioxide from the flue gas of a coal-fired power plant. In particular we construct a monolithic model of a carbon capture unit and conduct a rigorous optimization to find the lowest solvent regeneration energy yet reported. Carbon capture is primarily motivated by …
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Comparative Studies of Alternative Anaerobic Digestion Technologies
… digestion technologies include thermophilic, acid/gas phased, and temperature phased digestion. In order to evaluate the relative merits of each, a year long study evaluated the performance of bench scale digestion systems at varying solids retention times (SRT) and organic loading rates …
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Anaerobic Digestion: Factors Effecting Odor Generation
… increased greater amounts of odorous sulfur gases were produced from dewatered biosolids cakes. Aluminum did not show any relationship with organic sulfur odors. Parameters commonly used for assessing the performance of anaerobic digesters (volatile solids reduction (VSR), residual biological …
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Star-like macromers from lignin
… titration), vapor pressure osmometry, hydriotic acid/gas chromatography, ultraviolet spectroscopy, proton-nuclear magnetic resonance spectroscopy and thermal analysis. Number average molecular weights were measured by vapor pressure osmometry. Total hydroxyl content was determined after …
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STRATEGIES TO INCREASE PRODUCTION AND ENERGY EFFICIENCY OF A BASELOAD LNG PLANT
… section consists of LNG liquefaction, natural gas liquid recovery, nitrogen removal unit (NRU), and export terminal. Two configurations for NRU are considered and the specific power requirement of the entire cold section is minimized. Then the acid gas removal unit is incorporated in the cold …
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The Volumetric Properties for Selected Impurities in Dense CO2 Destined for Re-Injection
Acid gas re-injection and carbon capture and storage are two technologies now implemented for reducing the industrial emission of CO2 and management of produced CO2. In both cases, impurities such as H2O, H2S, COS, O2, and SO2 can find a way into a CO2 injectate stream. These impurities can impact …
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A Comparative Study of Anaerobic Digestion Processes for Sewage Sludge
… plant included thermophilic anaerobic digestion, acid/gas phased digestion, and temperature phased anaerobic digestion. To obtain design data, a year long study was conducted using bench scale digestion systems operating at different solids retention times (SRT) and organic loading rates (OLR). …
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Treatment of air pollutants emitted from corn-derived ethanol production facilities
… is widely seen as an environmentally friendly gasoline oxygenate that is renewable and sustainable. As a result, the total annual capacity of ethanol production facilities in the United States is rising rapidly. However, ethanol has environmental issues that may limit its use as a gasoline …
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Molten Alkali Metal Borate/Carbonate Salts for High Temperature CO₂ Capture and Electrochemical Conversion
… and as an alternative to current greenhouse gas-intensive CNT synthesis pathways. Prior work in this field has primarily focused on the effects of parameters such as alternate chemistries, electrolyte additives, and electrode composition on the achievable products and energetic demands. This …
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Isolation and lactose metabolism of Streptococcus lactis variety tardus from southwestern Virginia
… var. tardus cultures was accomplished by silicic acid column chromatography of the spent lactose-phosphate-yeast extract media. Two cultures of S. lactis var. tardus were isolated from parent§_. lactis cultures that were being transferred in litmus milk rehydrated with distilled water during a …
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Supramolecular hydrogels based on 1,3,5‐benzene tricarboxamides
… BTA core, the introduction of three carboxylic acid groups as lateral headgroups proved to be mandatory to achieve stable gel formation upon change of the pH value. Different gelation methods were investigated for the carboxylic acid derivative and the properties of the resulting hydrogels were …
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Plantwide Control System Design for IGCC Power Plants with CO2 Capture
… control system of a commercial-scale integrated gasification combined cycle (IGCC) power plant with CO2 capture is considered. The control system design is developed with the objective of optimizing a desired scalar function while satisfying operational and environmental constraints in the …
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The liability of carbon dioxide shortage
… analyzed in the context of several case studies: acid gas injection, natural gas storage, secondary oil recovery, and enhanced oil recovery. Methods for containing liability are considered in the context of regulatory analogs. This research finds that the current public and private mechanisms that …
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Leveraging Competitive Sorption in Microporous Polymer Membranes to Enhance Gas Separation Performance
… the permeability of a membrane for a gas is defined by the product of the gas’s diffusivity and sorption coefficient in the material. By extension, a membrane’s permselectivity can be broken down into the product of its diffusion selectivity and sorption selectivity. Microporous …
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Mathematical modeling and simulation of the performance of potassium glycinate in CO2 absorption in a packed-bed absorption column
… the emission data and characteristics of flue gas emanating from different industrial processes. The main processes under study were, Power Generation with particular emphasis on the Combined Cycle Gas Turbine setup, Natural Gas Pre-treatment, where the simulations were developed for gas …
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