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Prospects for single-molecule detection in liquids by laser-induced fluorescence

Description: A laser-induced fluoresence determination of aqueous solutions of rhodamine 6G resulted in a detection limit of 18 attograms, or 22,000 molecules, of rhodamine 6G. These results allow the projection to single-molecule detection with reasonable improvements in the experimental apparatus.
Date: January 1, 1983
Creator: Trkula, Mitchell; Keller, Richard A.; Martin, John C.; Jett, James H. & Dovichi, Norman J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Conversion of solvent refined lignite into premium liquid fuels. Annual report, January-December, 1980

Description: Comparison of three preasphaltene samples separated from three lignite derived samples obtained from GFETC prepared at 404, 460 and 480/sup 0/C shows that increased temperature tends to produce higher molecular weight preasphaltene fractions containing more aromatic carbons with fewer acid (phenolic) sites per molecule. Ether cleavage studies of the model compounds; diphenyl ether, bibenzothiophene, dibenzofuran and anisole, show that partial or complete ether cleavage was obtained with sodium … more
Date: April 1, 1981
Creator: Baltisberger, R. J.; Stenberg, V. I.; Klabunde, K. J. & Woolsey, N. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Quantitation of the reductive cleavage of aryl ethers of SRC and coals. Semi Annual report, September 1980-March 1981

Description: During the first period of this contract our work has focused on the synthesis of appropriate aryl ethers to use in testing ether cleavage reactions. These compounds were prepared by standard literature conditions. Generally, an appropriate aryl halide was treated with sodium phenoxide at 150 to 250/sup 0/C using a copper powder catalyst. After separating from the copper and extracting the unreacted sodium phenoxide with water, the residual crude phenyl ether was purified by crystallization, di… more
Date: April 1, 1981
Creator: Woolsey, N. F. & Bartk, D. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Feasibility of producing jet fuel from GPGP (Great Plains Gasification Plant) by-products

Description: The Great Plains Gasification Plant (GPGP) in Beulah, North Dakota, is in close proximity to several Air Force bases along our northern tier. This plant is producing over 137 million cubic feet per day high-Btu SNG from North Dakota lignite. In addition, the plant generates three liquid streams, naphtha, crude phenol, and tar oil. The naphtha may be directly marketable because of its low boiling point and high aromatic content. The other two streams, totalling about 4300 barrels per day, are av… more
Date: January 1, 1987
Creator: Willson, W. G.; Knudson, C. L. & Rindt, J. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Production of jet fuels from coal-derived liquids

Description: Samples of jet fuel (JP-4, JP-8, JP-8X) produced from the liquid by-products of the gasification of lignite coal from the Great Plains Gasification Plant were analyzed to determine the quantity and type of organo-oxygen compounds present. Results were compared to similar fuel samples produced from petroleum. Large quantities of oxygen compounds were found in the coal-derived liquids and were removed in the refining process. Trace quantities of organo-oxygenate compounds were suspected to be pre… more
Date: June 1, 1990
Creator: Knudson, C. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Feasibility of producing jet fuel from GPGP (Great Plains Gasification Plant) by-products

Description: The Great Plains Gasification Plant (GPGP) in Beulah, North Dakota, is in close proximity to several Air Force bases along our northern tier. This plant is producing over 137 million cubic feet per day of high-Btu SNG from North Dakota lignite. In addition, the plant generates three liquid streams, naphtha, crude phenol, and tar oil. The naphtha may be directly marketable because of its low boiling point and high aromatic content. The other two streams, totalling about 4300 barrels per day, are… more
Date: January 1, 1988
Creator: Rindt, J. R. & Smith, E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Laser spectroscopy and dynamics of transient species formed in pyrolysis reactions

Description: This research concerns the study of the spectroscopy and excited state dynamics of a number of transient molecules containing either sulfur or oxygen. The identification and study of sulfur species which are analogs of important oxygen-containing combustion intermediates is important to our understanding of reactive intermediates. The oxygen-containing species chosen for study are new systems whose electronic spectra have not previously been identified. The major experimental technique used in … more
Date: November 1, 1991
Creator: Clouthier, D. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Laser spectroscopy and dynamics of transient species formed in pyrolysis reactions. Three year progress report, June 1, 1989--May 31, 1992

Description: This research concerns the study of the spectroscopy and excited state dynamics of a number of transient molecules containing either sulfur or oxygen. The identification and study of sulfur species which are analogs of important oxygen-containing combustion intermediates is important to our understanding of reactive intermediates. The oxygen-containing species chosen for study are new systems whose electronic spectra have not previously been identified. The major experimental technique used in … more
Date: November 1, 1991
Creator: Clouthier, D. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Advanced direct liquefaction concepts for PETC generic units. Quarterly technical progress report, January--March 1992

Description: In the Advance Coal Liquefaction Concept Proposal (ACLCP) carbon monoxide (CO) and water have been proposed as the primary reagents in the pretreatment process. The main objective of this project is to develop a methodology for pretreating coal under mild conditions based on a combination of existing processes which have shown great promise in liquefaction, extraction and pyrolysis studies. The aim of this pretreatment process is to partially depolymerise the coal, eliminate oxygen and diminish… more
Date: April 1, 1992
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Advanced direct liquefaction concepts for PETC generic units

Description: In the Advance Coal Liquefaction Concept Proposal (ACLCP) carbon monoxide (CO) and water have been proposed as the primary reagents in the pretreatment process. The main objective of this project is to develop a methodology for pretreating coal under mild conditions based on a combination of existing processes which have shown great promise in liquefaction, extraction and pyrolysis studies. The aim of this pretreatment process is to partially depolymerise the coal, eliminate oxygen and diminish… more
Date: April 1, 1992
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Thermolysis of surface-immobilized phenethyl phenyl ether

Description: Our research has focused on modeling the constraints on free-radical reactions that might be imposed in coal as a consequence of its cross-linked macromolecular structure by covalently bonding diphenylalkanes to an inert silica surface. A surface-immobilized phenethyl phenyl ether ({approx}PhCH{sub 2}CH{sub 2}POh, or {approx}PPE-3) has been prepared as a model for ether linkages in lignin by the condensation of p-HOPhCH{sub 2}CH{sub 2}OPh with the surface hydroxyls of a high purity fumed silica… more
Date: January 1, 1991
Creator: Britt, P. F.; Buchanan, A. C., III & Hitsman, V. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Effects of organic additives on the formation of solids from hypersaline geothermal brine

Description: Studies are underway to identify compounds that will, at cost-effective concentrations, inhibit scale and solids formation when added to the brine at the high-temperature (approximately 200{sup 0}C) front end of the plant. The study reported here constitutes a preliminary, bench-test screening of 49 substances, the most promising of which will be examined later in on-line pilot plant studies. A variety of substances were tested, including both simple and polymeric alcohols, ethers, aldehydes, c… more
Date: March 1, 1978
Creator: Harrar, J. E.; Lorensen, L. E.; Otto, C. H., Jr.; Deutscher, S. B. & Tardiff, G. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Coal conversion processes. Quarterly report, December 13, 1983-March 12, 1984

Description: Experimental work is continuing on four separate projects related to coal conversion processes. The direct digital control of exothermic multiphase reactions is being studied in an experimental adiabatic flow reactor. The existence of two stable steady states for the Fischer-Tropsch reaction network at the same temperature and feed condition has been verified and quantified. Various absorbents for SO/sub 2/ and NO/sub X/ are being studied. The absorption of NO/sub 2/ by methanol and N-cyclohexy… more
Date: May 1, 1984
Creator: Cobb, J. T., Jr.; Biloen, P.; Holder, G. D.; Klinzing, G. E. & Tierney, J. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaluation, design, development and delivery of a 1200 kV prototype termination. Seventh technical progress report, June 1, 1980-August 31, 1980

Description: Results of wet tests on the small scale resistive grading model are inconclusive. A significant improvement is observed however in the intermediate scale resistive grading models, especially on 60 Hz tests. Photographs of epoxy insulator puncture tests graphically illustrate the improvement due to use of a shatter-resistant reinforcement. Calculated results of expected mechanical forces for several designs are reported. Final design of the full scale prototype termination has commenced and crit… more
Date: October 1, 1980
Creator: Billings, J S; Fisher, W H; Neri, Z; Hofman, C F & Bennett, A. I., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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