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Anaerobic bioprocessing of low-rank coals

Description: The overall goal of this project is to find biological methods to remove carboxylic functionalities from low-rank coals and to assess the properties of the modified coal towards coal liquefaction. The main objectives for this quarter were: (1) continuation of microbial consortia development and maintenance, (2) crude enzyme study using best decarboxylating organisms, (3) decarboxylation of lignite, demineralized Wyodak coal and model polymers, and (4) characterization of biotreated coals.
Date: April 15, 1992
Creator: Jain, M. K.; Narayan, R. & Han, O.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Electrochemistry applied to biomass. Progress report, October 1980-September 1981

Description: The electrochemical conversion of biomass-derived compounds, obtained through thermochemical pretreatments, into valuable organic chemicals, petrochemical substitutes, and energy-intensive chemicals is investigated. A hardwood-derived lignin obtained from ethanol extraction of the explosively depressurized aspen has been investigated. We have partially characterized this lignin material, and have also submitted it to electrolyses under controlled potential. The electrolytic conditions employed … more
Date: April 1, 1982
Creator: Chum, H. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Processing of oil shale in molten hydroxides

Description: Scoping experiments to determine bounds on a possible process for producing fuel hydrocarbons from oil shale by pyrolysis in a bath of molten Na, Li, and K hydroxides have been done. The process can be carried out at relatively low temperatures, 200 to 225/sup 0/C, requires the presence of water and oxygen, and gives hydrocarbon and organic acid products, apparently free of sulfur and nitrogen. A mechanism of oxidation of kerogen at heteroatoms and other functional groups, followed by decarboxy… more
Date: January 1, 1984
Creator: Hues, A.D.; Rofer-DePoorter, C.K. & Rogers, R.N.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Anaerobic bioprocessing of low-rank coals. [Veillonella alcalescens and Propionibacterium acidipropionici]

Description: The overall goal of this project is to find biological methods to remove carboxylic functionalities from low-rank coals under ambient conditions and to assess the properties of these modified coals towards coal liquefaction. The main objectives of this quarter were: (1) continuation of microbial consortia development, (2) evaluation of the isolated organisms for decarboxylation, (3) selection of best performing culture (known cultures vs. new isolates), and (4) coal decarboxylation using activa… more
Date: January 30, 1992
Creator: Jain, M. K.; Narayan, R. & Han, O.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Use of molecular modeling to determine the interaction and competition of gases within coal for carbon dioxide sequestration, Annual Technical Progress Report: 2005

Description: Molecular modeling was employed to both visualize and probe our understanding of carbon dioxide sequestration within a bituminous coal. A large-scale (>20,000 atoms) 3D molecular representation of Pocahontas No. 3 coal was generated. This model was constructed based on a the review data of Stock and Muntean, oxidation and decarboxylation data for aromatic clustersize frequency of Stock and Obeng, and the combination of Laser Desorption Mass Spectrometry data with HRTEM, enabled the inclusion… more
Date: April 21, 2006
Creator: Evanseck, Jeffrey D.; Madura, Jeffry D. & Mathews, Jonathan P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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CARBOXYLATIONS AND DECARBOXYLATIONS

Description: A brief survey of decarboxylation reactions and carboxylation reactions that are known or presumed in biological systems will be presented. While a considerable number of amino acid decarboxylations are known, their mechanisms will not be included in the present discussion but will be reserved for a later paper in the symposium. The remaining decarboxylation reactions may be subdivided into oxidative and nonoxidative decarboxylations. In most cases, these reactions are practically irreversible … more
Date: April 21, 1959
Creator: Calvin, Melvin & Pon, Ning G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

An Isotope Effect in a Simple Chemical Reaction

Description: It has been found that the carbon dioxide obtained from the decarboxylation of singly-carboxyl labeled malonic acid is impoverished in the C{sup 14} label and that the acetic acid formed is correspondingly enriched.
Date: July 13, 1948
Creator: Yankwich, Peter E. & Calvin, Melvin
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Anaerobic bioprocessing of low rank coals

Description: The overall goal of this project is to find biological methods to remove carboxylic functionalities from low rank coals under ambient conditions and to assess the properties of these modified coals towards coal liquefaction. The main objectives for this quarter were: (1) enrichment of anaerobic microbial consortia in a coal fed chemostat, (2) characterization of biocoal products and examination of liquefaction potential, (3) isolation of decarboxylating organisms and evaluation of the isolated … more
Date: January 1, 1991
Creator: Jain, M. K.; Narayan, R. & Han, O.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Pre-Steady State Kinetics of the NAD-Malic Enzyme from Ascaris suum in the Direction of Oxidative Decarboxylation of L-Malate

Description: Stopped-flow experiments in which the NAD-malic enzyme was preincubated with different reactants at near saturating substrate concentrations suggest a slow isomerization of the E:NAD:Mg complex. The lag is eliminated by preincubation with Mg˙² and malate suggesting that the formation of E:Mg:Malate either bypasses or speeds up the slow isomerization step. Circular dichroic spectral studies of the secondary structural changes of the native enzyme in the presence and absence of substrates support… more
Date: December 1991
Creator: Rajapaksa, Ranjani, 1949-
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Anaerobic bioprocessing of low-rank coals. Quarterly progress report, October 1--December 31, 1991

Description: The overall goal of this project is to find biological methods to remove carboxylic functionalities from low-rank coals under ambient conditions and to assess the properties of these modified coals towards coal liquefaction. The main objectives of this quarter were: (1) continuation of microbial consortia development, (2) evaluation of the isolated organisms for decarboxylation, (3) selection of best performing culture (known cultures vs. new isolates), and (4) coal decarboxylation using activa… more
Date: January 30, 1992
Creator: Jain, M. K.; Narayan, R. & Han, O.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Advanced Coal Conversion Process Demonstration Project. Technical progress report, January 1, 1991--December 31, 1991

Description: This project will demonstrate an advanced thermal coal drying process coupled with physical cleaning techniques to upgrade high-moisture, low-rank coals to produce a high-quality, low-sulfur fuel. The coal will be processed through two vibrating fluidized bed reactors that will remove chemically bound water, carboxyl groups, and volatile sulfur compounds. After drying, the coal will be put through a deep-bed stratifier cleaning process to effect separation of the pyrite rich ash. The process wi… more
Date: February 1, 1992
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The production of a premium solid fuel from Powder River Basin coal

Description: This report describes our initial evaluation of a process designed to produce premium-quality solid fuel from Powder River Basin (PRB) coal. The process is based upon our experience gained by producing highly-reactive, high-heating-value char as part of a mild-gasification project. In the process, char containing 20 to 25 wt % volatiles and having a gross heating value of 12,500 to 13,000 Btu/lb is produced. The char is then contacted by coal-derived liquid. The result is a deposit of 6 to 8 wt… more
Date: September 1, 1992
Creator: Merriam, N.; Sethi, V.; Thomas, K. & Grimes, R. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Anaerobic bioprocessing of low-rank coals. Quarterly progress report, January 1--March 31, 1991

Description: The objective of this project is to find biological methods to remove carboxylic functionalities from low rank coals under ambient conditions and to assess the properties of these modified coals towards coal decarboxylation. The microbial consortia will be developed using a fermentor system first under batch and then in a continuous system. The main objectives for this quarter were to develop microbial consortia that would decarboxylate coal and isolate potential anaerobic microorganisms with d… more
Date: December 31, 1991
Creator: Jain, M. K.; Narayan, R. & Han, O.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Anaerobic bioprocessing of low rank coals. Quarterly progress report, April 1--June 30, 1991

Description: significant achievements were: (1) Coal decarboxylation was achieved by batch bioreactor systems using adapted anaerobic microbial consortium. (2) Two new isolates with coal decarboxylation potential were obtained from adapted microbial consortia. (3) CHN and TG anaysis of anaerobically biotreated coals have shown an increase in the H/C ratio and evolution rate of volatile carbon which could be a better feedstock for the liquefaction process.
Date: December 31, 1991
Creator: Jain, M. K.; Narayan, R. & Han, O.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Anaerobic bioprocessing of low-rank coals. Progress report, April 1--June 30, 1992

Description: We are seeking to find biological methods to remove carboxylic functionalities from low-rank coals and to assess the properties of the modified coal towards coal liquefaction. The main objectives for this quarter were : continuation of microbial consortia development and maintenance, evaluation of commercial decarboxylase, decarboxylation of lignite, demineralized Wyodak coal and model polymer, and characterization of biotreated coals. Specifically we report that two batch fermentor systems wer… more
Date: July 14, 1992
Creator: Jain, M. K.; Narayan, R. & Han, O.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Mechanisms for radiation damage in DNA. Progress report, August 1, 1976--October 31, 1977

Description: In this project we have proposed mechanisms for radiation damage to DNA constituents and DNA, and have detailed a series of experiments utilizing electron spin resonance spectrometry to test the proposed mechanisms. In this past year investigations were completed on reactions of the ..pi..-cations of thymidine TMP and 1-methylthymine, charge transfer in aromatic peptide ..pi..-cation radicals, and electron reactions with amino acid anhydrides. A study in which we have made significant progress … more
Date: July 1, 1977
Creator: Sevilla, M. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Advanced Coal Conversion Process Demonstration Project

Description: This project will demonstrate an advanced thermal coal drying process coupled with physical cleaning techniques to upgrade high-moisture, low-rank coals to produce a high-quality, low-sulfur fuel. The coal will be processed through two vibrating fluidized bed reactors that will remove chemically bound water, carboxyl groups, and volatile sulfur compounds. After drying, the coal will be put through a deep-bed stratifier cleaning process to effect separation of the pyrite rich ash. The process wi… more
Date: February 1, 1992
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The production of a premium solid fuel from Powder River Basin coal. [COMPCOAL Process]

Description: This report describes our initial evaluation of a process designed to produce premium-quality solid fuel from Powder River Basin (PRB) coal. The process is based upon our experience gained by producing highly-reactive, high-heating-value char as part of a mild-gasification project. In the process, char containing 20 to 25 wt % volatiles and having a gross heating value of 12,500 to 13,000 Btu/lb is produced. The char is then contacted by coal-derived liquid. The result is a deposit of 6 to 8 wt… more
Date: January 1, 1992
Creator: Merriam, N.; Sethi, V.; Thomas, K. & Grimes, R. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Anaerobic bioprocessing of low-rank coals

Description: The objective of this project is to find biological methods to remove carboxylic functionalities from low rank coals under ambient conditions and to assess the properties of these modified coals towards coal decarboxylation. The microbial consortia will be developed using a fermentor system first under batch and then in a continuous system. The main objectives for this quarter were to develop microbial consortia that would decarboxylate coal and isolate potential anaerobic microorganisms with d… more
Date: January 1, 1991
Creator: Jain, M. K.; Narayan, R. & Han, O.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Anaerobic bioprocessing of low-rank coals. Quarterly progress report, January 1--March 31, 1992

Description: The overall goal of this project is to find biological methods to remove carboxylic functionalities from low-rank coals and to assess the properties of the modified coal towards coal liquefaction. The main objectives for this quarter were: (1) continuation of microbial consortia development and maintenance, (2) crude enzyme study using best decarboxylating organisms, (3) decarboxylation of lignite, demineralized Wyodak coal and model polymers, and (4) characterization of biotreated coals.
Date: April 15, 1992
Creator: Jain, M. K.; Narayan, R. & Han, O.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Improved Processes to Remove Naphthenic Acids

Description: In the past three years, we followed the work plan as we suggested in the proposal and made every efforts to fulfill the project objectives. Based on our large amount of creative and productive work, including both of experimental and theoretic aspects, we received important technical breakthrough on naphthenic acid removal process and obtained deep insight on catalytic decarboxylation chemistry. In detail, we established an integrated methodology to serve for all of the experimental and theore… more
Date: December 9, 2005
Creator: Zhang, Aihua; Ma, Qisheng; Wang, Kangshi; Tang, Yongchun & Goddard, William A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Carbon Dioxide Fixation by Microorganisms

Description: Resting cells of eleven microorganisms were exposed to radioactive carbon dioxide for 40 minutes. The radioactive compounds formed during this time were separated and identified by paper chromatography. Resting cells of Lactobacillus casei fixed no carbon dioxide and growing cells fixed carbon dioxide primarily in malic and aspartic acids. All of the radioactive compounds formed could have become radioactive by reversal of known decarboxylation reactions.
Date: July 24, 1951
Creator: Lynch, Victoria H. & Calvin, Melvin
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Improved Processes to Remove Naphthenic Acids

Description: In the first year of this project, we have established our experimental and theoretical methodologies for studies of the catalytic decarboxylation process. We have developed both glass and stainless steel micro batch type reactors for the fast screening of various catalysts with reaction substrates of model carboxylic acid compounds and crude oil samples. We also developed novel product analysis methods such as GC analyses for organic acids and gaseous products; and TAN measurements for crude o… more
Date: April 28, 2004
Creator: Zhang, Aihua; Ma, Qisheng; Goddard, William A. & Tang, Yongchun
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Improved Processes to Remove Naphthenic Acids

Description: In the second year of this project, we continued our effort to develop low temperature decarboxylation catalysts and investigate the behavior of these catalysts at different reaction conditions. We conducted a large number of dynamic measurements with crude oil and model compounds to obtain the information at different reaction stages, which was scheduled as the Task2 in our work plan. We developed a novel adsorption method to remove naphthenic acid from crude oil using naturally occurring mate… more
Date: May 5, 2005
Creator: Zhang, Aihua; Ma, Qisheng; Wang, Kangshi; Goddard, William A. & Tang, Yongchun
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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