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Exploratory Research on novel coal liquefaction concept. Technical progress, October 1--December 31, 1995

Description: The purpose of this coordinated research program is to explore a new approach to direct coal liquefaction in which the primary coal dissolution step is effected by chemical rather than thermal cleavage of bonds in the coal. This is done at a temperature which is significantly lower than that typically used in conventional coal liquefaction. Reaction at this low temperature results in high conversion of the coal to a solubilized form, with little hydrocarbon gas formed, and avoids the thermally … more
Date: December 31, 1995
Creator: Burke, F. P.; Winschel, R. A. & Brandes, S. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Coal-derived promoters for the liquefaction of Illinois coal. Technical report, September 1, 1991--November 30, 1991

Description: The objective of this program is to investigate the use of liquids derived from coal either by mild gasification or supercritical extraction (SCE) to promote direct liquefaction of Illinois coal. Some organic sulfur-, nitrogen-, and oxygen-containing compounds have been found to enhance liquefaction reactions. The use of Illinois coal to produce liquid fractions rich in these types of compounds could increase the rates of liquefaction reactions, thus improving the process economics. An integrat… more
Date: December 31, 1991
Creator: Carty, R. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Coal-derived promoters for the liquefaction of Illinois coal. Final technical report, September 1, 1991--August 31, 1992

Description: The objective of this program was to investigate the use of liquids derived from coal either by mild gasification or supercritical extraction (SCE) to promote direct liquefaction of Illinois coal. In this two-year program recently developed molecular probe techniques were used to assess the activity of three coal-derived liquids with respect to accelerating (A) hydrogen transfer, (B) carbon-carbon bond cleavage, (C) free radical flux, and (D) hydrocracking activity. Three sample liquids were pr… more
Date: December 31, 1992
Creator: Carty, R. H. & Knight, R. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Coprocessing through fundamental and mechanistic studies in hydrogen transfer and catalysis. Quarterly report, December 27, 1991--March 27, 1992

Description: The research conducted this quarter evaluated hydrogen transfer from resids reduced using the Birch reduction method and their corresponding parent resid to an aromatic acceptor, anthracene (ANT). The reactions involved thermal and catalytic reactions using sulfur introduced as thiophenol. This catalyst has been shown by Rudnick to affect the hydrogen transfer from cycloalkane to aromatics/or coal. The purpose of this current study was to evaluate the efficacy of hydrogen transfer from the hydr… more
Date: December 31, 1992
Creator: Curtis, C. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Coprocessing through fundamental and mechanistic studies in hydrogen transfer and catalysis. Quarterly report, March 28, 1992--June 30, 1992

Description: Hydrogen transfer from naphthenes to aromatics, coal, resid, and coal plus resid has been investigated at 430{degree}C in a N{sub 2} atmosphere. The reaction of perhydropyrene (PHP) with anthracene (ANT) resulted in the formation of pyrene (PYR) and dihydroanthracene. The weight percents of the products formed varied according to the initial ratio of ANT/PHP with a minimum appearing at a 2:1 weight ratio. Increased reaction times and high ANT/PHP ratios also yielded tetrahydroanthracene (THA). … more
Date: December 31, 1992
Creator: Curtis, C. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Coprocessing through fundamental and mechanistic studies in hydrogen transfer and catalysis. Quarterly report, September 26, 1991--December 26, 1991

Description: The research conducted during this quarter evaluated hydrogen transfer from hydroaromatics and cyclic olefins to aromatics under thermal and catalytic conditions. The reactions under study involved thermal reactions of a cyclic olefin, isotetralin (ISO), with aromatics, anthracene (ANT) and pyrene (PYR). These reactions completed a set of experiments with hydrogen-rich species and aromatics previously reported that included cycloalkanes of perhydropyrene (PHP) and perhydroanthracene (PHA), hydr… more
Date: December 31, 1991
Creator: Curtis, C. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Improved performance in coprocessing through fundamental and mechanistic studies in hydrogen transfer and catalysis. Final report, September 26, 1989--March 31, 1993

Description: The key results obtained from this research project are given: (1) Hydrogen transfer from naphthenes to aromatics, coal and resid occurred at coprocessing temperatures and in a N{sub 2} atmosphere; (2) Hydrogen donors ranked in reactivity as cyclic olefins (nonaromatic hydroaromatic compounds) > hydroaromatic compounds > naphthenes. This ranking held regardless of the type of atmosphere, hydrogen or nitrogen, used; (3) Resids reduced by the Birch method transferred substantially more hydrogen t… more
Date: December 31, 1993
Creator: Curtis, C. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Improved performance in coprocessing through fundamental and mechanistic studies in hydrogen transfer and catalysis. Quarterly report, December 26, 1989--March 26, 1990

Description: To gain a fundamental understanding of the role and importance of hydrogen transfer reactions in thermal and catalytic coprocessing by examining possible hydrogen donation from cycloalkane/aromatic systems and by understanding the chemistry and enhanced reactivity of hydrotreated residuum, as well as by enriching petroleum solvent with potent new donors, nonaromatic hydroaromatics, thereby promoting hydrogen transfer reactions in coprocessing. The detailed results of experiments performed on se… more
Date: December 31, 1990
Creator: Curtis, C. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Improved performance in coprocessing through fundamental and mechanistic studies in hydrogen transfer and catalysis. Quarterly report, December 27, 1990--March 26, 1991

Description: The objective is to gain a fundamental understanding of the role and importance of hydrogen transfer reactions in thermal and catalytic coprocessing by examining possible hydrogen donation from cycloalkane/aromatic systems and by understanding the chemistry and enhanced reactivity of hydrotreated residuum, as well as by enriching petroleum solvent with potent new donors, nonaromatic hydroaromatics, thereby promoting hydrogen transfer reactions in coprocessing. The detailed results of experiment… more
Date: December 31, 1991
Creator: Curtis, C. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Improved performance in coprocessing through fundamental and mechanistic studies in hydrogen transfer and catalysis. Quarterly report, June 27, 1991--September 26, 1991

Description: The objective is to gain a fundamental understanding of the role and importance of hydrogen transfer reactions in thermal and catalytic coprocessing by examining possible hydrogen donation from cycloalkane/aromatic systems and by understanding the chemistry and enhanced reactivity of hydrotreated residuum, as well as by enriching petroleum solvent with potent new donors, nonaromatic hydroaromatics, thereby promoting hydrogen transfer reactions in coprocessing. The detailed results of experiment… more
Date: December 31, 1991
Creator: Curtis, C. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Improved performance in coprocessing through fundamental and mechanistic studies in hydrogen transfer and catalysis. Quarterly report, March 27, 1991--June 26, 1991

Description: The objective is to gain a fundamental understanding of the role and importance of hydrogen transfer reactions in thermal and catalytic coprocessing by examining possible hydrogen donation from cycloalkane/aromatic systems and by understanding the chemistry and enhanced reactivity of hydrotreated residuum, as well as by enriching petroleum solvent with potent new donors, nonaromatic hydroaromatics, thereby promoting hydrogen transfer reactions in coprocessing. The detailed results of experiment… more
Date: December 31, 1991
Creator: Curtis, C. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Improved performance in coprocessing through fundamental and mechanistic studies in hydrogen transfer and catalysis. Quarterly report, September 26, 1989--December 26, 1989

Description: To gain a fundamental understanding of the role and importance of hydrogen transfer reactions in thermal and catalytic coprocessing by examining possible hydrogen donation from cycloalkane/aromatic systems and by understanding the chemistry and enhanced reactivity of hydrotreated residuum, as well as by enriching petroleum solvent with potent new donors, nonaromatic hydroaromatics, thereby promoting hydrogen transfer reactions in coprocessing. The detailed results of experiments performed on se… more
Date: December 31, 1989
Creator: Curtis, C. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Improved performance in coprocessing through fundamental and mechanistic studies in hydrogen transfer and catalysis. Quarterly report, September 27, 1990--December 26, 1990

Description: The objective is to gain a fundamental understanding of the role and importance of hydrogen transfer reactions in thermal and catalytic coprocessing by examining possible hydrogen donation from cycloalkane/aromatic systems and by understanding the chemistry and enhanced reactivity of hydrotreated residuum, as well as by enriching petroleum solvent with potent new donors, nonaromatic hydroaromatics, thereby promoting hydrogen transfer reactions in coprocessing. The detailed results of experiment… more
Date: December 31, 1990
Creator: Curtis, C. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Low severity coal liquefaction promoted by cyclic olefins. Quarterly report, July--September 1993

Description: Low-severity coal liquefaction allows for the solubilization of coal with reduced gas make. The idea being tested in this research is whether selective bond rupture occurs during liquefaction at low temperatures that can be satisfied by hydrogen donation from highly active hydrogen donor compounds. Promotion of coal solubilization through hydrogen transfer using highly active and effective hydrogen donors is the objective of this study. The highly effective hydrogen donors being tested are cycl… more
Date: December 31, 1993
Creator: Curtis, C. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Low severity coal liquefaction promoted by cyclic olefins. Quarterly report, October--December 1993

Description: Acid pretreatment removes those alkaline metal and alkaline earth cations which inhibit coal reactivity and hydrogen transfer. Shams et al. (1992) found that through this pretreatment a large portion of the calcium present in coal was removed. Hydrochloric acid was used in that study, but sulfurous acid, if similar results are achieved, would be a much more suitable acid for processing. Another pretreatment method to remove these cations is one using ammonium acetate (Hengel and Walker, 1984). … more
Date: December 31, 1993
Creator: Curtis, C. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The role of the resid solvent in co-processing with finely divided catalysts. Quarterly report, October--December 1992

Description: Goal this quarter was to evaluate the reactivity of an anthracene (H-deficient aromatic) and perhydropyrene (H-rich cycloalkane) system to determine if this system is the one desired for the parametric evaluation. Idea was to determine if hydrogen could be transferred from cycloalkane to aromatic in a hydrogen atmosphere, which is always present in coprocessing. This quarter`s work established procedures for performing thermal and catalytic reactions without a solvent, and for analysis of react… more
Date: December 31, 1992
Creator: Curtis, C. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The role of the resid solvent in coprocessing with finely divided catalysts. Quarterly report, October--December 1993

Description: The reactions with anthracene as a hydrogen acceptor were performed to determine how much hydrogen could be transferred by the hexane soluble resid fraction and hydrogen atmosphere to anthracene. The product distributions obtained by anthracene are given in Table 4. The products obtained from anthracene (ANT) were dihydroanthracene (DHA) and hexahydroanthracene (HHA). When FHC-365 was the resid used in the reaction, very similar amounts of ANT, DHA, and HHA were present after the reaction in bo… more
Date: December 31, 1993
Creator: Curtis, C. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Low severity coal liquefaction promoted by cyclic olefins. Quarterly report, October 1995--December 1995

Description: The goal of this research is to develop a methodology for analyzing the reactivity of cyclic olefins in situ in a high temperature and high pressure infrared cell. Cyclic olefins, such as 1,4,5,8-tetrahydronaphthalene (isotetralin) and 1,4,5,8,9,10-hexahydroanthracene (HHA), are highly reactive donor compounds that readily donate their hydrogen to coal and model acceptors when heated to temperatures of 200{degrees}C and above. These donors are active donors in the low severity liquefaction of c… more
Date: December 31, 1995
Creator: Curtis, C.W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Low severity coal liquefaction promoted by cyclic olefins. Quarterly technical progress report, April--June 1996

Description: The goal of this research is to develop a methodology for analyzing the reactivity of cyclic olefins in situ in a high temperature and high pressure infrared cell. Cyclic olefins, such as 1,4,5,8-tetrahydronaphthalene (isotetralin) and 1,4,5,8,9,10-hexahydroanthracene (HHA), are highly reactive donor compounds that readily donate their hydrogen to coal and model acceptors when heated to temperatures of 200{degrees}C and above. These donors are active donors in the low severity liquefaction of c… more
Date: December 31, 1997
Creator: Curtis, C.W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Resonance Raman and photophysical studies of transition metal complexes in solution and entrapped in zeolites. Progress report, August 1, 1991--March 31, 1992

Description: We have obtained convincing evidence for localization of the optical electron on a single-ring fragment of a chelated ``bipyridine-like`` ligand (ie., pyridylpyrazine or 4-Methyl-bipyridine). In addition we have completed studies of Ru(bipyrazine){sub 3}{sup 2+} in aqueous sulfuric acid (0--98% by weight) and find clear evidence for sequential addition of six-protons to the six peripheral nitrogen atoms. Studies of zeolite-entrapped complexes are continuing and a series of homo- and heterolepti… more
Date: March 31, 1992
Creator: Kincaid, J. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Resonance Raman and photophysical studies of transition metal complexes in solution and entrapped in zeolites

Description: We have obtained convincing evidence for localization of the optical electron on a single-ring fragment of a chelated bipyridine-like'' ligand (ie., pyridylpyrazine or 4-Methyl-bipyridine). In addition we have completed studies of Ru(bipyrazine){sub 3}{sup 2+} in aqueous sulfuric acid (0--98% by weight) and find clear evidence for sequential addition of six-protons to the six peripheral nitrogen atoms. Studies of zeolite-entrapped complexes are continuing and a series of homo- and heteroleptic … more
Date: March 31, 1992
Creator: Kincaid, J.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Progress in donor assisted coal liquefaction: Hydroaromatic compound formation

Description: The role of hydrogen donor compounds in coal liquefaction has been extensively investigated since the mid 1960`s using model compounds and process derived hydrogen donor solvents. Our recent research and that of other investigators have shown that two model compounds in particular have great efficacy in solvating low rank coals. 1,2,3,10b tetrahydrofluoranthene (H{sub 4}Fl) and 1,2,3,6,7,8 hexahydropyrene (H{sub 6}Py) have been used to dissolve Wyodak coal to > 95% soluble material as measured … more
Date: December 31, 1993
Creator: Kottenstette, R. J. & Stephens, H. P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The single electron transfer chemistry of coals. Final report

Description: This research addressed electron donar properties and radical reactions in coal. Solid residues from pyridine Soxhlet extractions of Pocahontas No. 3, Upper Freeport, Pittsburgh No. 8, Illinois No. 6 and Wyodak coals were exposed to 4-vinylpyridine vapors and swelled. All of the 4-vinylpyridine could not be removed under vacuum at 100{degree}C. Diffuse reflectance FTIR revealed the presence of poly-(4-vinylpyridine) in the Illinois No. 6 and Wyodak coals. EPR spectra displayed the loss of inert… more
Date: December 31, 1994
Creator: Larsen, J. W. & Flowers II, R. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Selective solvent absorption in coal conversion. Quarterly report, July 1, 1992--September 30, 1992

Description: The objectives of this program include: Determine the importance of the presence of added hydrogen donor compounds within the coal in the first stage of direct liquefaction processes; and to determine the composition of the solvent absorbed by and present within the coal in the first stages of direct coal liquefaction. The scope includes the study of the conversion of Argonne Premium coals in tetralin and 2-t-butyltetralin and a comparison of the following: Conversion to soluble products and pr… more
Date: December 31, 1992
Creator: Larsen, John W. & Amui, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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