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in subjects: "Hexane"

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Research on oil recovery mechanisms in heavy oil reservoirs

The goal of the Stanford University Petroleum Research Institute is to conduct research directed toward increasing the recovery of heavy oils. Presently, SUPRI is working in five main directions: To assess the influence of different reservoir conditions (temperature and pressure) on the absolute and relative permeability to oil and water and on capillary pressure; To evaluate the effect of different reservoir parameters on the in-situ combustion process. This project includes the study of the k… more

Date: January 1, 1991

Creator: Brigham, W.E.; Aziz, K. & Ramey, H.J. Jr.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Process and analytical studies of enhanced low severity co-processing using selective coal pretreatment

This report describes progress on research during the eleventh quarter of this contract dealing with applications of coal pretreatment techniques in coal/oil co-processing and direct hydroliquefaction. The objectives of the project are to investigate various coal pretreatment techniques and to determine the effect of these pretreatment procedures on the reactivity of the coal. Reactivity enhancement will be evaluated under both direct hydroliquefaction and co-processing conditions. Coal convers… more

Date: 1991-06~

Creator: Baldwin, R. M.; Gaur, S. & Miller, R. L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Analyses of mixed-hydrocarbon binary thermodynamic cycles for moderate-temperature geothermal resources using regeneration techniques

Studies of basic binary geothermal cycles utilizing mixtures of hydrocarbons have shown better performance than for pure fluids for a moderate temperature (360/sup 0/F) resource. However, a loss is net geofluid effectiveness (watt-hours net plant output/1bm geofluid) results when the geofluid outlet temperature is limited to temperatures in excess of 160/sup 0/F to alleviate a silica precipitation problem. This study examined three working fluids consisting of binary mixtures of hydrocarbons to… more

Date: December 1, 1981

Creator: Demuth, O. J. & Kochan, R. J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Liquid fuels production from biomass. Progress report No. 5, July 1-September 30, 1978

The current program to convert biomass into liquid hydrocarbon fuels is an extension of the previous program to ferment marine algae to acetic acid. In that study, it was found that marine algae could be converted to higher aliphatic organic acids and that these acids could be readily removed from the fermentation both by membrane or liquid-liquid extraction. It was then proposed to convert these higher organic acids to aliphatic hydrocarbons via Kolbe Electrolysis, which may be used as a diese… more

Date: January 1, 1978

Creator: Sanderson, J.E. & Wise, D.L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Power-cycle studies for a geothermal electric plant for MX operating bases

Binary geothermal plants were investigated for providing electrical power for MX missile bases. A number of pure hydrocarbons and hydrocarbon mixtures were evaluated as working fluids for geothermal resource temperatures of 365, 400, and 450/sup 0/F. Cycle thermodynamic analyses were conducted for pure geothermal plants and for two types of coal-geothermal hybrid plants. Cycle performance results were presented as net geofluid effectiveness (net plant output in watts per geofluid flow in 1 bm/h… more

Date: November 1, 1981

Creator: Bliem, C. J. & Kochan, R. J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Analyses of mixed hydrocarbon binary thermodynamic cycles for moderate temperature geothermal resources

A number of binary geothermal cycles utilizing mixed hydrocarbon working fluids were analyzed with the overall objective of finding a working fluid which can produce low-cost electrical energy using a moderately low temperature geothermal resource. Both boiling and supercritical shell-and-tube cycles were considered. The performance of a dual-boiling isobutane cycle supplied by a 280/sup 0/F hydrothermal resource (corresponding to the 5MW pilot plant at the Raft River site in Idaho) was selecte… more

Date: January 1, 1981

Creator: Demuth, O.J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Vaporization at supercritical pressures and counterflow condensing of pure and mixed-hydrocarbon working fluids for geothermal power plants

The Heat Cycle Research Program has as its objective the development of the technology for effecting improved utilization of moderate temperature geothermal resources. Current testing involves supercritical vaporization and counterflow in-tube condensing in an organic Rankine cycle. Results of the experiments are given for both pure and mixed-hydrocarbon working fluids. The heater and condenser behavior predicted by the Heat Transfer Research, Inc. computer codes used for correlation of the dat… more

Date: January 1, 1986

Creator: Bliem, C.J.; Demuth, O.J.; Mines, G.L. & Swank, W.D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Analysis of organic compounds in water by direct adsorption and thermal desorption. [Dissertation]

An instrument was designed and constructed that makes it possible to thermally desorb organic compounds from wet adsorption traps to a gas chromatograph in an efficient and reproducible manner. Based on this device, a method of analyzing organics in water was developed that is rapid, sensitive, and of broader scope than previously published methods. The system was applied to the analysis of compounds with a wide range of volatilities. Temperature and flow parameters were investigated and specif… more

Date: March 1, 1980

Creator: Ryan, J.P. Jr.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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High voltage research (breakdown strengths of gaseous and liquid insulators) and environmental effects of dielectric gases. Semiannual report, April 1, 1979-September 30, 1979. [Health and Safety Research Div. , ORNL]

A number of gas mixtures are suggested for industrial-scale testing. Electron attachment rates were measured and unfolded to give attachment cross section functions for CCl/sub 3/F, CCl/sub 2/F/sub 2/, and CClF/sub 3/ each in N/sub 2/, and for CCl/sub 3/F in Ar. Electron attachment rates were measured also for n-C/sub 6/F/sub 14/ in both Ar and N/sub 2/. The effects of molecular structure on energy, cross section, and lifetime of negative ion states of organic molecules were considered. A study… more

Date: January 1, 1980

Creator: Christophorou, L.G.; James, D.R.; Pai, R.Y.; Mathis, R.A.; Sauers, I.; Frees, L. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Survey of LWR environmental control technology performance and cost

This study attempts to establish a ranking for species that are routinely released to the environment for a projected nuclear power growth scenario. Unlike comparisons made to existing standards, which are subject to frequent revision, the ranking of releases can be used to form a more logical basis for identifying the areas where further development of control technology could be required. This report describes projections of releases for several fuel cycle scenarios, identifies areas where al… more

Date: March 1, 1980

Creator: Heeb, C. M.; Aaberg, R. L.; Cole, B. M.; Engel, R. L.; Kennedy, W. E., Jr. & Lewallen, M. A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

SYNTHESIS OF METAL HYDRIDES BY MECHANICAL ALLOYING IN AN ATTRITOR MILL: FY07 STATUS REPORT

The objective of this task was to demonstrate that metal hydrides could be produced by mechanical alloying in the quantities needed to support the tritium production facilities at the Savannah River Site. The objective for the FY07 portion of this task was to demonstrate the production of Zr-Fe getter materials by mechanical alloying and begin to optimize the milling parameters. Three starting compositions (ratios of elemental Zr and Fe powders) were selected and attritor milled under argon for… more

Date: November 8, 2007

Creator: Fox, K

Item Type: Report

Partner: UNT Libraries Government Documents Department

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(Photoexcited Charge Pair Escape and Recombination)

Progress in four research areas on this project are summarized under the following topics: (1) Geminate charge pair recombination in hexane; (2) Fast current measurements resulting from excitation of charge transfer (CT) states; (3) Measurement of the dipole moment of excited states by DC conductivity; and (4) Charge separation at macroscopic interfaces between electron donor and acceptor solids. In a final section, personnel who have contributed to the project during the past budget period are… more

Date: January 1, 1990

Creator: Braun, C. L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Solvation of the electron in alcohols studied using the Argonne picosecond pulse radiolysis stem

The Argonne picosecond pulse radiolysis system and its application towards understanding solvation processes in polar liquids are described. The alcohols studied are n-butanol, 2-decanol, and t-butanol. (LK)

Date: January 1, 1979

Creator: Johah, Charles D. & Kenney-Wallace, Geraldine A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Thermal and hydraulic performance tests of a sieve-tray direct-contact heat exchanger vaporizing pure and mixed-hydrocarbon Rankine-cycle working fluids

Experiments investigating a sieve-tray direct-contact heat exchanger were conducted at the Raft River Geothermal Test Site in southeastern Idaho using the 60-kW Mobile Heat Cycle Research Facility operating in the thermal loop mode (without a turbine). Isobutane, propane, and several hydrocarbon mixtures were heated and boiled in the direct-contact column, which is approx. 12 in. in diameter and 19-1/2 ft. high, using the energy from a 280/sup 0/F geothermal resource. Using pure fluids, isobuta… more

Date: August 1, 1983

Creator: Mines, G.L.; Demuth, O.J. & Wiggins, D.J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Thermal and hydraulic performance of a sieve-tray direct-contact heat exchanger

Experiments investigating the thermal and hydraulic performance of a sieve tray direct contact heat exchanger (DCHX) were conducted using a 275/sup 0/ geothermal fluid as an energy source and different hydrocarbons as working fluids. The baseline performance tests with the direct contact unit were conducted with isobutane. The thermal performance of the unit met or exceeded the design goals for individual tray thermal efficiencies and pinch points. Hydraulically the column operated near recomme… more

Date: January 1, 1983

Creator: Mines, G.L. & Wiggins, D.J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Effect of taggant vapor adsorption and containment on the pedetonation detection of explosives

Predetonation detection of explosives in realistic scenarios may be accomplished by detecting vapors emitted by the explosive. These vapors could be either the vapor emitted from the inherent compounds present in the explosive or the vapor emitted by a specific vapor taggant introduced into the explosive at the time of manufacture. The emitted vapor concentration in various detection scenarios can be diminished either by vapor adsorption onto adsorptive surfaces present in the scenario, e.g., c… more

Date: October 1, 1979

Creator: Senum, G. I.; Ferreri, E. M.; Greene, M. W.; Gergley, R. P. & Dietz, R. N.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

The mobile phase in coals: Its nature and modes of release: Part 2, Efforts to better define the nature and magnitude of the mobile phase: Final report

Several liquefaction conditions and many extracting solvents were used in attempts to set up conditions such that, as the conditions became more severe, progressively more hexane-solubles, analyzable by GC/MS, would be released. It was hoped to identify a threshold beyond which trapped mobile phase molecules would become evident. A set of 10 hexane-soluble fractions, all obtained under various conditions from the same coal (a sample of Herrin No. 6 seam, Illinois), were subjected to analysis by… more

Date: April 1, 1987

Creator: Given, P.H.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Process and analytical studies of enhanced low severity co-processing using selective coal pretreatment

This report describes progress on research during the seventh quarter of this contract dealing with applications of coal pretreatment techniques in coal hydroliquefaction. The objectives of the project are to investigate various coal pretreatment techniques and to determine the effect of these pretreatment procedures on the reactivity of the coal. Reactivity enhancement will be evaluated under both direct hydroliquefaction and co-processing conditions. Coal conversion utilizing low rank coals a… more

Date: 1990-09~

Creator: Baldwin, R. M. & Miller, R. L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Synthesis of metastable aluminum-based intermetallics by mechanical alloying

We have used mechanical alloying (MA) to prepare fine-grained powders of Al 25 at. % X (X = Ti, Zr, Hf) having the metastable cubic L1{sub 2} structure. Hexane (C{sub 6}H{sub 14}) is added to the milling media to avoid the agglomeration of the aluminum powder. Carbon from the decomposition of the hexane incorporates into the powder to form a fine dispersion of carbides. These carbides are beneficial because they limit grain growth during consolidation and add strength to the alloy. We have cons… more

Date: January 1, 1991

Creator: Schwarz, R.B.; Srinivasan, S. & Desch, P.B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Process and analytical studies of enhanced low severity co-processing using selective coal pretreatment

This report describes progress on research during the 12th and final quarter of this contract dealing with applications of coal pretreatment techniques in coal/oil co-processing and direct hydroliquefaction. The overall objectives of the project are to investigate various coal pretreatment techniques and to determine the effect of these pretreatment procedures on the reactivity of the coal. Reactivity enhancement will be evaluated under both direct hydroliquefaction and co-processing conditions… more

Date: 1991-09~

Creator: Baldwin, R. M.; Gaur, S. & Miller, R. L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Condensing curves for a number of mixed-hydrocarbon working fluids

Condensing curves are presented for a number of two-component mixed hydrocarbon working fluids which are potentially usable in binary geothermal cycles. Performance of geothermal thermodynamic cycles incorporating these fluids has been evaluated under separate cover; two figures summarizing the results of those evaluations have been included here for continuity. The purpose of this report is: first, to document the condensing curves which were used in the mixed fluid cycle analyses, and second,… more

Date: July 1, 1981

Creator: Denmuth, O.J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Fischer-Tropsch synthesis in supercritical reaction media

Our goals for this quarter were to complete construction of the reactor and analytical units for carrying out Fischer-Tropsch (F-T) synthesis in liquid (n-hexadecane) and in supercritical n-hexane phases. Progress during this quarter was slower than expected.

Date: January 1, 1993

Creator: Subramaniam, B.; Bochniak, D. & Snavely, K.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Transuranic organometallics: The next generation

Neptunium and plutonium metal react cleanly with 3/2 equiv. I{sub 2} in aprotic ligating solvents, L, such as tetrahydrofuran (THF), pyridine (Py), and dimethylsulfoxide (DMSO) to give the triiodide complexes as tetrasolvates, AnI{sub 3}(L){sub 4} (An = Np, L = THF (1)); An = Pu, L = THF (2a), Py (2b), and DMSO (2c). These triiodide complexes are convenient precursors to new transuranic compounds. Reaction of the triiodide complexes 1 and 2a hexane with 3 equiv. of sodium bis(trimethylsilyl)ami… more

Date: January 1, 1990

Creator: Zwick, Bill D.; Sattelberger, Alfred P. & Avens, Larry R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Analyses of mixed-hydrocarbon binary thermodynamic cycles for moderate-temperature geothermal resources

A number of binary geothermal cycles utilizing mixed hydrocarbon working fluids were analyzed with the overall objective of finding a working fluid which can produce low-cost electrical energy using a moderately-low temperature geothermal resource. Both boiling and supercritical shell-and-tube cycles were considered. The performance of a dual-boiling isobutane cycle supplied by a 280/sup 0/F hydrothermal resource (corresponding to the 5 MW pilot plant at the Raft River site in Idaho) was select… more

Date: February 1, 1981

Creator: Demuth, O.J.

Item Type: Report

Partner: UNT Libraries Government Documents Department