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in subjects: "Ethers"

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Kilowatt Isotope Power System: component report for the Ground Demonstration System Accumulator

The Model Number ORC1A3A01 System Accumulator for the Kilowatt Isotope Power System was expulsion tested and demonstrated to be in compliance with the requirements of Sundstrand Explusion Test Procedure, TP 400. Test requirements of TP 400 were extracted from the Kilowatt Isotope Power System, Ground Demonstration System Test Plan.

Date: January 31, 1978

Creator: Brainard, E.L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Pentamethylcyclopentadienyl and bis(trimethylsilyl)amido complexes of the di- and trivalent lanthanides

The reaction of the divalent iodides YbI/sub 2/ and EuI/sub 2/ with NaN(SiMe/sub 3/)/sub 2/ has provided pentane-soluble, monomeric derivatives of the divalent lanthanides. These compounds are isolated as the solvated species Eu(N(SiMe/sub 3/)/sub 2/)/sub 2/L/sub 2/ (L = thf or 1,2-dme), Yb(N(SiMe/sub 3/)/sub 2/)/sub 2/(thf)/sub 1/ /sub 5/ and Yb(N(SiMe/sub 3/)/sub 2/)/sub 2/L/sub 2/ (L = 1,2-dme or OEt/sub 2/), or as the sodium salts NaM(N(SiMe/sub 3/)/sub 2/)/sub 3/ (M = Eu or Yb). The pentam… more

Date: March 1, 1982

Creator: Tilley, T. D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Facile reaction/extraction of coal with supercritical fluids. Quarterly technical progress report, January 1-March 31, 1984

Arylmethyl phenyl ethers undergo competing reactions when treated with Lewis acids in benzene solvent. Apparently, benzene is insufficiently reactive to compete with intramolecular (intrapolymer) nucleophiles and, consequently, no increase in solubility accompanies the cleavages of ether links upon addition of benzene. When better nucleophiles, naphthalene and phenanthene, are provided, carbonium ions generated from ether cleavages are capped and the product is lower in molecular weight and mor… more

Date: April 20, 1984

Creator: Venier, C. G. & Squires, T. G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Energies of organic compounds. Technical progress report. [Ketals, orthoesters, norbonyl ketals]

Two automated reaction calorimetry systems were built and tested. The first made use of a quartz thermometer probe as the temperature measuring element. The second was constructed using a thermister which was part of a Wheatstone bridge. The off-balance voltage from the bridge was measured using the 6 1/2 digit digital voltmeter, and transferred to the microprocessor. The one disadvantage of the first system is the relatively large size of the quartz sensor. The calorimeter systems were used to… more

Date: February 19, 1981

Creator: Wiberg, K. B.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Energies of organic compounds. [Polyoxygenated methanes, ketals, orthoesters, cyclopropane derivatives]

Automatic reaction calorimeters were developed. Enthalpies of hydration or hydrolysis were determined for polyoxygenated methanes, ketals, acetals, orthoesters, and alkenes. Trifluoroacetolysis of alkenes was carried out. Enthalpies of acetolysis and combustion of cyclopropane derivatives were also determined. Molecular mechanics calculations were carried out for ketones and ketals. Charge distribution in organic compounds were studied. 31 references. (DLC)

Date: July 1, 1980

Creator: Wiberg, K. B.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Coal surface control for advanced fine coal flotation

The primary objective in the scope of this research project is to develop advanced flotation methods for coal cleaning in order to achieve near total pyritic-sulfur removal at 90% Btu recovery, using coal samples procured from three major US coal seams. Concomitantly, the ash content of these coals is to be reduced to 6% or less. Investigation of mechanisms for the control of coal and pyrite surfaces prior to fine coal flotation is the main aspect of the project objectives. The results of this … more

Date: July 30, 1991

Creator: Fuerstenau, D. W.; Sastry, K. V. S.; Hanson, J. S.; Diao, J.; De, A.; Sotillo, F. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Deploymerization of coal by direct solvent attack. Semi-annual report, April 1, 1983-August 31, 1983

The depolymerization of Illinois No. 6 coal by a series of solvents having different basecities (pK/sub a/) and nucleophilicities (Swain-Scott nu values) showed no dependence on either the basicity of nucleophilicity of the solvents. As expected, the conversion decreases as the temperature of the reaction is reduced, but the lower the reaction temperature, the higher the percentage of amine incorporation becomes in the products. 5 tables.

Date: September 15, 1983

Creator: Larsen, J. W. & Mohammadi, M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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The single electron chemistry of coals

The objective of this work is to investigate and characterize the single electron reactions of alkyl and alkoxy aromatic compounds in order to determine the role these reactions play in the chemistry of coal. Activities carried out in this reporting period are as follows: (1) attempts will be made to demonstrate that the radicals from inertinite maceral group will initiate the polymerization of 4-vinylpyridine; (2) the molecule, N,N-diphenyl-phenylenediamine, will be deposited in coals to chara… more

Date: January 1, 1991

Creator: Larsen, John W. & Eskay, T.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Exploratory study of coal conversion chemistry. Quarterly report No. 2, August 19, 1981-November 18, 1981. [Hydroxydipnenylmethanes, triphenylmethane, diphenylether]

This report describes work accomplished under two tasks: Task A, mechanisms of donor-solvent coal liquefaction, and Task B, CO/H/sub 2/O conversion systems. Under Task A, we describe additional evidence relating to the question of the mechanism of the iron oxide catalyzed cleavage of hydroxydiphenylmethanes. o-Hydroxydiphenylmethane is relatively more sensitive to catalysis by Fe/sub 3/O/sub 4/, a possible one electron oxidant, and triphenylmethane is relatively more sensitive to catalyzed clea… more

Date: January 29, 1982

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Coal liquefaction process streams characterization and evaluation:

SRI International evaluated two analytical methods for application to coal liquefaction. These included field ionization mass spectrometry and a technique employing iodotrimethylsilane for the derivatization of oxygen bound to alkyl carbon (alkyl ethers). The full report authored by the SRI researchers is presented here. The following assessment briefly highlights the major findings of the project, and evaluates the potential of the methods for application to coal-derived materials. These resul… more

Date: January 1, 1992

Creator: Malhotra, R.; McMillen, D.F. (SRI International, Menlo Park, CA (United States)); Burke, F.P.; Winschel, R.A. & Brandes, S.D. (Consolidation Coal Co., Library, PA (United States). Research and Development Dept.)

Item Type: Report

Partner: UNT Libraries Government Documents Department

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The efficient use of natural gas in transportation

Concerns over air quality and greenhouse gas emissions have prompted discussion as well as action on alternative fuels and energy efficiency. Natural gas and natural gas derived fuels and fuel additives are prime alternative fuel candidates for the transportation sector. In this study, we reexamine and add to past work on energy efficiency and greenhouse gas emissions of natural gas fuels for transportation (DeLuchi 1991, Santini et a. 1989, Ho and Renner 1990, Unnasch et al. 1989). We add to p… more

Date: January 1, 1992

Creator: Stodolsky, F. & Santini, D. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Study of the surface properties of ceramic materials by chromatography

Most fundamental research on adsorption assumes adsorbent surfaces to be homogeneous. Material chemists have been able to design and prepare a variety of adsorbents with a highly homogeneous surface. These adsorbents are widely used in chromatography and in adsorption studies, contributing to further anchor the idea that homogeneous surfaces are the most frequent case. In reality, many common materials used as finely divided powders such as pigments, fillers, ceramics, or involved in industrial… more

Date: March 1, 1992

Creator: Guiochon, G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Facile reaction/extraction of coal with supercritical fluids. Quarterly technical progress report, April 1, 1983-June 30, 1983. [In Benzene]

In summary, model studies have provided the following information. An aprotic solvent will be required for both transalkylation and ionic hydrogenation; a non-nucleophilic solvent will be required for ionic hydrogenation; intromolecular reaction will occur in the reactions of phenyl ethers; and in an aromatic solvent, arylation (transalkylation) occurs in preference to ionic hydrogenation. Model studies of the ionic hydrogenation were continued using a copolymer of 1,4-bis(bromomethyl)naphthale… more

Date: September 1, 1983

Creator: Venier, C. G. & Squires, T. G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Studies of the effect of selected nondonor solvents on coal liquefaction yields

The objective of this research program was to evaluate the effectiveness of selected nondonor solvents (i.e., solvents that are not generally considered to have hydrogen available for hydrogenolysis reactions) for the solubilization of coals. Principal criteria for selection of candidate solvents were that the compound should be representative of a major chemical class, should be present in reasonable concentration in coal liquid products, and should have the potential to participate in hydroge… more

Date: September 1, 1983

Creator: Jolley, R. L.; Rodgers, B. R.; Benjamin, B. M.; Poutsma, M. L.; Douglas, E. C. & McWhirter, D. A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Design of generic coal conversion facilities: Production of oxygenates from synthesis gas---A technology review

This report concentrates on the production of oxygenates from coal via gasification and indirect liquefaction. At the present the majority of oxygenate synthesis programs are at laboratory scale. Exceptions include commercial and demonstration scale plants for methanol and higher alcohols production, and ethers such as MTBE. Research and development work has concentrated on elucidating the fundamental transport and kinetic limitations governing various reactor configurations. But of equal or gr… more

Date: October 1, 1991

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Solvent extraction of phenols from water

Methyl isobutyl ketone (MIBK) and diisopropyl ether (DIPE) have been evaluated as solvents for extraction of phenols, at high dilution, from water. Equilibrium distribution coefficients (K/sub D/) have been measured for phenol, dihydroxybenzenes and trihydroxybenzenes in both solvents as a function of pH. Particularly for the multihydric phenols, MIBK gives substantially higher values of K/sub D/ than does DIPE. The effect of pH can be described quantitatively through a simple ionization model,… more

Date: February 1, 1980

Creator: Greminger, D. C.; Burns, G. P.; Lynn, S.; Hanson, D. H. & King, C. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Gas Phase Radiolysis and Vacuum Ultraviolet Photolysis of Heterocyclic Organic Compounds. Progress Report, Feburary 1, 1979-February 1, 1980

The long-range objective of our research group is to gain a better understanding of the processes by which complex organic molecules react when they absorb large amounts of energy. This progress report describes the results of our recent work in three areas: diradicals derived from heterocyclic compounds; trimethylene diradicals from various sources; and ion-molecule reactions.

Date: January 1, 1980

Creator: Scala, A. A.; Nguyen, D.; Rourke, W. & Caputo, M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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THE STRUCTURE OF THE SO-CALLED ''ETHYLMETAPHOSPHATE'' (LANGHELDESTER)

Phosphorus pentoxide reacts with ether to form bicyclo-tetraphosphate ester (II), cyclotetraphosphate ester (III), isocyclotetraphosphate ester (IV), and tetraphosphate ester (V). Phosphorus n.m.r. measurements show the content of the mixtures. The so-called 'ethyl metaphosphate' (Langheld ester) is a mixture of III (50% to 45%), IV (36% to 25%), and V (14% to 30%).

Date: June 1, 1964

Creator: Burkhardt, Gottfried; Klein, Melvin & Calvin, Melvin.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Highly Luminescent Lanthanide Complexes of 1 Hydroxy-2-pyridinones

The synthesis, X-ray structure, stability, and photophysical properties of several trivalent lanthanide complexes formed from two differing bis-bidentate ligands incorporating either alkyl or alkyl ether linkages and featuring the 1-hydroxy-2-pyridinone (1,2-HOPO) chelate group in complex with Eu(III), Sm(III) and Gd(III) are reported. The Eu(III) complexes are among some of the best examples, pairing highly efficient emission ({Phi}{sub tot}{sup Eu} {approx} 21.5%) with high stability (pEu {ap… more

Date: November 1, 2007

Creator: University of California, Berkeley; Laboratory, Lawrence National; Raymond, Kenneth; Moore, Evan G.; Xu, Jide; Jocher, Christoph J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Exploratory research, Tasks A, B, C, and D. Final report, August 17-December 31, 1977

SRI International has conducted research on the upgrading of computerized thermo-hydro code calculations and the synthesis of energetic materials. This project comprised four tasks, as follows: Task A included: (1) formulating routines for inverting the P = P(T,V) and V = V(T,P) equations of state when isotherms exhibit a van der Waals' loop; (2) incorporating these routines into the TIGER code so V and T can be used as independent variables in computing thermodynamic functions of liquids exhib… more

Date: February 17, 1978

Creator: Simon, Robert L.; Coon, Clifford L.; Cowperthwaite, Michael & Sincich, Eugene

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Methyltrihydroborate complexes of the lanthanides and actinides

Reaction of MC1/sub 4/ (M = Zr, Hf, U, Th, Np) with LiBH/sub 3/CH/sub 3/ in chlorobenzene produces volatile, hexane-soluble M(BH/sub 3/CH/sub 3/)/sub 4/. Crystal structures are monomeric, tetrahedral species. Lewis base adducts prepared include U(BH/sub 3/CH/sub 3/)/sub 4/.THT, Th(BH/sub 3/CH/sub 3/)/sub 4/.L (L = THF (tetrahydrofuran), THT (tetrahydrothiophene), SMe/sub 2/, OMe/sub 2/), U(BH/sub 3/CH/sub 3/)/sub 4/.2L (L = THF, pyridine, NH/sub 3/), Th(BH/sub 3/CH/sub 3/)/sub 4/.2L (L = THF, T… more

Date: November 1, 1984

Creator: Shinomoto, R.S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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The Mark III vertex chamber and prototype test results

A vertex chamber has been constructed for use in the Mark III experiment. The chamber is positioned inside the current main drift chamber and will be used to trigger data collection, to aid in vertex reconstruction, and to improve the momentum resolution. This paper discusses the chamber's construction and performance and tests of the prototype.

Date: July 1, 1987

Creator: Grab, C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Chemistry and structure of coal derived asphaltenes and preasphaltenes. Quarterly progress report, October-December 1980. [Methyl-o-xylene; methyl anthracene; methyl naphthalene; methyl pyrene; methyl phenyl ether]

Six model compounds of low molecular weight polymers or oligomers of benzene, o-xylene, anthracene, naphthalene, pyrene, and diphenyl ether were synthesized to study the separate effects of ring number, aliphatic substitution and ether oxygen on pyrolysis yield and microstructure. The results of the experiments on the model compounds were not as expected and hard to explain. The polyphenyl and methyl-o-xylene formed fine and coarse mesophases respectively. Methyl naphthalene and methyl anthrace… more

Date: January 1, 1980

Creator: Yen, T.F.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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The Dual Role of Oxygen Functions in Coal Pretreatment and Liquefaction: Crosslinking and Cleavage Reactions

One objective of this program is to prepare polymer models having phenolic, carboxylic, and/or aryl ether groups considered to be important in low rank coals. In order to study the chemistry of these functional groups in a polymeric matrix, it is necessary that the polymer backbone itself should not be subject to cleavage under the reaction conditions. It is expected that poly(phenylene) would fulfill this requirement as a backbone, while providing simple mechanical routes for attaching other f… more

Date: January 1, 1991

Creator: Serio, M. A.; Kroo, E.; Teng, Hsisheng; Charpenay, S. & Solomon, P. R.

Item Type: Report

Partner: UNT Libraries Government Documents Department