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Pyrolysis of Hexadecafluoroheptane

Description: "The studies of this report were made to indicate the thermal stability at elevated temperatures of fluorocarbons similar to the hexadecafluoroheptane" (p. 4).
Date: September 23, 1949
Creator: Walker, D. V. & Gibson, J. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Preparation of N-Polychloropolyfluoroheptane

Description: From introduction: "Discussion of alternate processes for manufacture of perfluoroxylene as insurance against any eventuality, e.g. disaster, poor quality, required amount of elemental fluorine not obtainable, necessity for further expansion at some future date, or decreasing cost."
Date: 1946
Creator: Babcock, J. H.; Beanblossom, W. S. & Wojcik, B. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Infrared Analysis of n-Hexadecafluoroheptane and Hexadecafluorodimethylcyclohexane

Description: Summary: "By use of infrared spectroscopy come of the impurities in n-hexadecafluoroheptane and hexadecafluorodimethylcyclohexane have been identified and accurate specification analyses have been devised for measuring these impurities. These infrared analytical methods were used as an aid in setting acceptance specifications on the materials and for determining whether production materials met specifications."
Date: 1945
Creator: Williams, Van Zandt & Johnson, James L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Combustion Instability in an Acid-Heptane Rocket with a Pressurized-Gas Propellant Pumping System

Description: Results of experimental measurements of low-frequency combustion instability of a 300-pound thrust acid-heptane rocket engine were compared to the trends predicted by an analysis of combustion instability in a rocket engine with a pressurized-gas propellant pumping system. The simplified analysis, which assumes a monopropellant model, was based on the concept of a combustion the delay occurring from the moment of propellant injection to the moment of propellant combustion. This combustion time … more
Date: September 27, 1951
Creator: Tischler, Adelbert O. & Bellman, Donald R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Combustion of n-heptane in a shock tube and in a stirred reactor: A detailed kinetic modeling study

Description: A detailed chemical kinetic reaction mechanism is used to study the oxidation of n-heptane under several classes of conditions. Experimental results from ignition behind reflected shock waves and in a rapid compression machine were used to develop and validate the reaction mechanism at relatively high temperatures, while data from a continuously stirred tank reactor (cstr) were used to refine the low temperature portions of the reaction mechanism. In addition to the detailed kinetic modeling, a… more
Date: April 13, 1995
Creator: Gaffuri, P.; Curran, H.J.; Pitz, W.J. & Westbrook, C.K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A modelling study of the combustion of n-heptane and iso-octane in a high pressure turbulent flow reactor

Description: The primary reference fuels n-heptane and iso-octane and their mixtures are used as a measure of the tendency of a given automotive fuel to cause knocking or pre-ignition in an internal combustion engine. Consequently, many experimental studies have been performed on these hydrocarbons in an attempt to better understand their oxidation. Shock tube studies at high temperature and pressure have been performed. Low temperature studies, in which species concentration profiles of primary, intermedia… more
Date: April 13, 1995
Creator: Curran, H.J.; Gaffuri, P.; Pitz, W.J.; Westbrook, C.K.; Callahan, C.; Dryer, F.L. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Nano-scale materials

Description: This is the final report of a three-year, Laboratory Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). Highly selective, alumina-supported molybdenum carbonitrides were prepared by solution impregnation using the metal amide Mo{sub 2}(N(CH{sub 3}){sub 2}){sub 6} as a molecular precursor. On the basis of relative weight percents, these materials demonstrate a 5- to 8-fold increase in catalytic activity over similar materials prepared by traditional so… more
Date: December 31, 1998
Creator: Barrera, J.; Smith, D.C. & Devlin, D.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Air agglomeration of hydrophobic particles

Description: The agglomeration of hydrophobic particles in an aqueous suspension was accomplished by introducing small amounts of air into the suspension while it was agitated vigorously. The extent of aggregation was proportional both to the air to solids ratio and to the hydrophobicity of the solids. For a given air/solids ratio, the extent of aggregation of different materials increased in the following order: graphite, gilsonite, coal coated with heptane, and Teflon. The structure of agglomerates produc… more
Date: December 31, 1995
Creator: Drzymala, J. & Wheelock, T.D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Heavy Oil Process Monitor: Automated On-Column Asphaltene Precipitation and Re-Dissolution

Description: An automated separation technique was developed that provides a new approach to measuring the distribution profiles of the most polar, or asphaltenic components of an oil, using a continuous flow system to precipitate and re-dissolve asphaltenes from the oil. Methods of analysis based on this new technique were explored. One method based on the new technique involves precipitation of a portion of residua sample in heptane on a polytetrafluoroethylene-packed (PTFE) column. The precipitated mater… more
Date: March 31, 2007
Creator: Schabron, John F.; Rovani, Joseph F. & Sanderson, Mark
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Oxidation of automotive primary reference fuels in a high pressure flow reactor

Description: Automotive engine knock limits the maximum operating compression ratio and ultimate thermodynamic efficiency of spark-ignition (SI) engines. In compression-ignition (CI) or diesel cycle engines the premixed urn phase, which occurs shortly after injection, determines the time it takes for autoignition to occur. In order to improve engine efficiency and to recommend more efficient, cleaner-burning alternative fuels, we must understand the chemical kinetic processes which lead to autoignition in b… more
Date: January 1, 1998
Creator: Curran, H. J.; Pitz, W. J.; Westbrook, C. K.; Callahan, C. V. & Dryer, F. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Development of a gas-promoted oil agglomeration process. Quarterly technical progress report, July 1, 1995--September 30, 1995

Description: The preliminary laboratory-scale development of a gas-promoted, oil agglomeration process for cleaning coal advanced in three major research areas. One area of research resulted in the development of a method for measuring the rate of agglomeration of dilute particle suspensions and using the method to relate the rate of agglomeration of coal particles to various key parameters. A second area of research led to the development of a method for monitoring a batch agglomeration process by measurin… more
Date: December 31, 1995
Creator: Wheelock, T.D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Detailed Chemical Kinetic Reaction Mechanisms for Combustion of Isomers of Heptane

Description: Detailed chemical kinetic reaction mechanisms are developed for all nine chemical isomers of heptane (C{sub 7}H{sub 16}), following techniques and models developed previously for other smaller alkane hydrocarbon species. These reaction mechanisms are tested at high temperatures by computing shock tube ignition delay times and at lower temperatures by simulating ignition in a rapid compression machine. Although the corresponding experiments have not been reported in the literature for most of th… more
Date: March 26, 2001
Creator: Westbrook, C K; Pitz, W J; Curran, H C; Boercker, J & Kunrath, E
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Engineering development of advanced physical fine coal cleaning for premium fuel applications. Task 6 -- Selective agglomeration laboratory research and engineering development for premium fuels

Description: The primary goal of this project is the engineering development of two advanced physical fine coal cleaning processes, column flotation and selective agglomeration, for premium fuel applications. The project scope included laboratory research and benchscale testing on six coals to optimize these processes, followed by the design, construction, and operation of a 2 t/hr process development unit (PDU). The project began in October, 1992, and is scheduled for completion by September 1997. This rep… more
Date: June 27, 1997
Creator: Moro, N. & Jha, M. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Dielectric constant measurements on n-heptane and 2-heptanone

Description: A liquid transfer station has been built and installed in a fume hood. The dielectric properties of n-heptane and 2-heptanone have been measured using the coaxial structure of the Model 100-1, S/N 1 as the liquid measurement cell. The low (10 kHz to 1 Mhz) frequency value of the relative dielectric constant {epsilon} r was measured with a HP 4275 Multifrequency LCR Meter. Also time domain reflection (TDR) and insertion time domain transmission (TDT) measurements were made using a HP 54120/54121… more
Date: January 12, 1994
Creator: Nahman, N.S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Engineering development of selective agglomeration: Task 6, Operation of the Component Development Test Facility

Description: The objective of this report is to summarize the component development and laboratory binder test work at Wilsonville during Task 6. This Task included the construction and startup of the Component Development Test Facility (CDTF), coal procurement, evaluation of unit operation and dewatering performance, laboratory binder tests for diesel and heptane, production characterization, and vendor tests. Data evaluation, interpretation, and analysis are not included in this report, but will be discus… more
Date: September 1, 1991
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Extinction and Autoignition of n-Heptane in Counterflow Configuration

Description: A study is performed to elucidate the mechanisms of extinction and autoignition of n-heptane in strained laminar flows under nonpremixed conditions. A previously developed detailed mechanism made UP of 2540 reversible elementary reactions among 557 species is the starting point for the study. The detailed mechanism was previously used to calculate ignition delay times in homogeneous reactors, and concentration histories of a number of species in plug-flow and jet-stirred reactors. An intermedia… more
Date: January 12, 2000
Creator: Seiser, R.; Pitsch, H.; Seshadri, K.; Pitz, W.J. & Curran, H.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A new model of coal-water interaction and relevance for dewatering. Quarterly technical progress report, 1 December--28 February 1993

Description: This project is concerned with a basic scientific question concerning the properties of coal- to what extent is the ability of coal to hold moisture a manifestation of the well-known ability of coal to swell, when exposed to good solvents? This quarter`s efforts involved continuing to use the flow microcalorimeter as a tool for characterizing the heat effects involved in interaction of swelling solvents and coals. These data are of relevance to the overall project goal of establishing that mois… more
Date: September 1, 1993
Creator: Suuberg, E. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Refining of fossil resin flotation concentrate from Western coal. Ninth quarterly report, January 1--March 31, 1995

Description: Heptane showed a consistently higher extraction than hexane even through heptane contains only one more methylene group in its molecular structure. However economic factors must also be considered in the overall evaluation of the process. In this regard a simple economic evaluation was carried out taking into consideration the operating costs for the resin concentrate refining process. First of all, the price of industrial grade heptane is about the same as hexane. Because the process operates … more
Date: March 31, 1995
Creator: Jensen, G. F. & Miller, J. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Fine particle clay catalysts for coal liquefaction. Quarterly technical progress report, May 8, 1993--August 8, 1993

Description: High hydrocracking and liquefaction activity can be achieved with 10 wt.% of sulfided clay-supported iron catalysts. Further tests and demonstrations of this activity were required. Iron hydroxyoxide was generated on acid-treated montmorillonite. The new batch of catalyst exhibited high hydrocracking activity, Three hour tests with the solubilized intermediate from low-severity treatment of Wyodak coal (LSW) gave a high conversion (45%) of the heptane-insoluble LSW intermediate to heptane-solub… more
Date: October 1, 1995
Creator: Olson, E.S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Detailed Chemical Kinetic Reaction Mechanisms for Autoignition of Isomers of Heptane Under Rapid Compression

Description: Detailed chemical kinetic reaction mechanisms are developed for combustion of all nine isomers of heptane (C{sub 7}H{sub 16}), and these mechanisms are tested by simulating autoignition of each isomer under rapid compression machine conditions. The reaction mechanisms focus on the manner in which the molecular structure of each isomer determines the rates and product distributions of possible classes of reactions. The reaction pathways emphasize the importance of alkylperoxy radical isomerizati… more
Date: December 17, 2001
Creator: Westbrook, C K; Pitz, W J; Boercker, J E; Curran, H J; Griffiths, J F; Mohamed, C et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Assessment of simulation predictions of hydrocarbon pool fire tests.

Description: An uncertainty quantification (UQ) analysis is performed on the fuel regression rate model within SIERRA/Fuego by comparing to a series of hydrocarbon tests performed in the Thermal Test Complex. The fuels used for comparison for the fuel regression rate model include methanol, ethanol, JP8, and heptane. The recently implemented flamelet combustion model is also assessed with a limited comparison to data involving measurements of temperature and relative mole fractions within a 2-m diameter met… more
Date: April 1, 2010
Creator: Luketa-Hanlin, Anay Josephine
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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