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Optimum Conditions for the "Hot Zone" Volatilization of TCl₄

Description: Abstract: "The data reported herein furnish a qualitative comparison of the rapidity of vaporization of TCl4 at various "hot zone" temperatures as well as a measure of the chlorine evolution attributed to its thermal decomposition. The presence of impurities in the TCl4 detracts from the significance of the reported chlorine evolution. The temperature recommended for rapid volatilization is 750 C at which TCl4 underwent thermal decomposition amounting to no more than 0.2% by weight."
Date: February 19, 1946
Creator: Crompton, C. E.; Calkins, V. P. & Larson, C. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Preparation of TCl₄ With Hexachloropropylene

Description: Report discussing various reaction methods for preparing TCl₄ with hexachloropropylene, as well as various methods for drying the TCl₄ after the reaction. Experimental methods are described in detail, and experimental results are presented.
Date: July 27, 1945
Creator: Pitt, B. M.; Curran, W. F.; Schmitt, J. M.; Wagner, E. L. & Miller, A. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Synthesis and characterization of 2-chloro-3-benzylthiopyrrolo[1,2-a]- benzimidazol-1-one and 2,3-di(benzylthio)pyrrolo[1,2-a]benzimidazol-1-one.

Description: The reaction between o-phenylenediamine and 2,3-dichloromaleic anhydride has been probed and found to give 2,3-dichloropyrrolo[1,2-a]- benzimidazol-1-one as the major product. Chlorine substitution in 2,3-dichloropyrrolo[1,2-a]benzimidazol-1-one by added benzylthiol occurs in the presence of pyridine to provide the corresponding monosulfide and disulfide derivatives. The first benzylthiol ligand undergoes reaction at the C-3 position of the five-membered pyrrolo-1-one ring, with the addition of… more
Date: December 2003
Creator: Huang, Shih-Huang
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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Direct Conversion of the TF₆ to TCl₄

Description: The following report provides a general summary of some methods that could be used to convert hexafluoride into tetrafluoride, but is mainly devoted to the work done on the conversion of tetrafluoride to tetrachloride.
Date: September 25, 1945
Creator: Calkins, Vincent P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Chlorine Trifluoride-Hydrogen Fluoride System. Some Vapor Pressure and Conductance Measurements

Description: The possible existence of a stable complex between chlorine trifluoride and hydrogen fluoride made further study of this system desirable. We have therefore investigated the vapor pressures and specific conductances of solutions of hydrogen fluoride in chlorine trifluoride.
Date: 1957
Creator: Rogers, Max T.; Speirs, John L. & Panish, Morton B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Task 1.16 - Enhanced Mobility of Dense Nonaqueoius-Phase Liquids (DNAPLs) Using Dissolved Humic Acids

Description: Chlorinated solvent contamination is widespread across the U.S. Department of Energy (DOE) complex and other industrial facilities. Because of the physical properties of dense nonaqueous-phase liquids (DNAPLs), current treatment technologies are generally incapable of completely removing contamination from the source area. Incomplete removal means that the residual DNAPL will persist as a long-term source of groundwater contamination. When DNALPs occur in the subsurface, they resist remediation… more
Date: August 1, 1997
Creator: Kurz, Marc D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Aqueous oxidation of trichloroethene (TCE): a kinetic and thermodynamic analysis

Description: An empirical kinetic rate law was determined for the aqueous oxidation of trichloroethene (TCE). By measuring both the rate of disappearance of TCE and the rate of appearance of carbon dioxide and chloride ion, mass balances were monitored to confirm that `mineralization` was the ultimate reaction. Dilute buffer solutions were used to fix pH and stoichiometrically sufficient amounts of dissolved oxygen were used to make the reactions zero-order in oxygen. Using standard chemical kinetic methods… more
Date: February 28, 1998
Creator: Knauss, K. G., LLNL
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Natural and Passive Remediation of Chlorinated Solvents: Critical Evaluation of Science and Technology Targets

Description: This report was written for multiple audiences. Each reader will likely approach the subject from a different perspective, seeking different information. The team that developed the document consisted of several technical experts on monitored natural attenuation (MNA) and included participants who were integral in the development of US EPA's chlorinated solvent MNA protocol and the subsequent US EPA and Office of Solid Waste and emergency Response (OSWER) policy directive. The primary assignmen… more
Date: April 7, 2004
Creator: Looney, Brian
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Scientific Basis for Monitored Natural Attenuation and Enhanced Passive Remediation for Chlorinated Solvents - DOE Alternative Project for Technology Acceleration Implementation Plan

Description: The overall Monitored Natural Attenuation and Enhanced Passive Remediation (MNA/EPR) Technology Alternative Project is narrowly focused, providing the scientific and policy support to facilitate implementing appropriate passive cleanup and cost effective monitoring strategies leading to responsible completion of active remediation activities at high risk DOE waste sites. MNA/EPR describe natural processes that mitigate exposure and risk and that are self-sustaining once implemented or require m… more
Date: April 15, 2003
Creator: Vangelas, K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Task 1.16 - Enhanced Mobility of Dense Nonaqueous-Phase Liquids (DNAPLs) Using Dissolved Humic Acids

Description: Chlorinated solvent contamination is widespread across the U.S. Department of Energy (DOE) complex and other industrial facilities. Because of the physical properties of dense nonaqueous-phase liquids (DNAPLs), current treatment technologies are generally incapable of completely removing contamination from the source area. Incomplete removal means that the residual DNAPL WN persist as a long-term source of groundwater contamination. When DNALPs occur in the subsurface, they resist remediation, … more
Date: February 1, 1998
Creator: Olson, Edwin S. & Kurz, Marc D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Immobilization of degradative bacteria in polyurethane-based foams: embedding efficiency and effect on bacterial activity

Description: The immobilization of TCE-degrading bacterium Burkholderia cepacia was evaluated using hydrophilic polyurethane foam. The influence of several foam formulation parameters upon cell retention was examined. Surfactant type was a major determinant of retention, with a lecithin- based compound retaining more cells than pluronic or silicone based surfactants. Excessive amounts of surfactant led to increased washout of bacteria. Increasing the biomass concentration from 4.8% to 10.5% caused fewer cel… more
Date: September 3, 1996
Creator: Wilde, E.W.; Radway, J.C.; Hazen, T.C. & Hermann, P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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SCENARIOS EVALUATION TOOL FOR CHLORINATED SOLVENT MNA

Description: Over the past three decades, much progress has been made in the remediation of chlorinated solvents from the subsurface. Yet these pervasive contaminants continue to present a significant challenge to the U.S. Department of Energy (DOE), other federal agencies, and other public and private organizations. The physical and chemical properties of chlorinated solvents make it difficult to rapidly reach the low concentrations typically set as regulatory limits. These technical challenges often resul… more
Date: August 16, 2006
Creator: Vangelas, K; Brian02 Looney, B; Truex, Michael J. & Newell, Charles J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Characterization of polyxylylenes with solid state {sup 13}C nuclear magnetic resonance spectroscopy

Description: Polyxylylenes are thermoplastics used as encapsulants for electronic devices. Five polyxylylenes were prepared by pyrolysis of [2.2]paracyclophanes and characterized by solid state {sup 13}C NMR spectroscopy. The chemical shift data, in combination with interrupted decoupling experiments, allowed assignment of resonances to their carbon sources in the polymers. This confirmed the integrity of the xylylene building block in the polymers and is consistent with linear polymers. No crosslinking cou… more
Date: February 1, 1996
Creator: Loy, D. A.; Assink, R. A.; Jamison, G. M.; McNamara, W. F.; Schneider, D. A. & Prabakar, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Characterization of anaerobic chloroethene-dehalogenating activity in several subsurface sediments

Description: Anaerobic microcosms of subsurface soils from four locations were used to investigate the separate effects of several electron donors on tetrachloroethylene (PCE) dechlorination activity. The substrates tested were methanol, formate, lactate, acetate, and sucrose. Various levels of sulfate-reducing, acetogenic, fermentative, and methanogenic activity were observed in all sediments. PCE dechlorination was detected in all microcosms, but the amount of dehalogenation varied by several orders of ma… more
Date: November 1, 1996
Creator: Skeen, R. S.; Gao, J.; Hooker, B. S. & Quesenberry, R. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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