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High Selectivity Oxygen Delignification

Description: The overall objective of this program was to develop improved extended oxygen delignification (EOD) technologies for current U.S. pulp mill operations. This was accomplished by: (1) Identifying pulping conditions that optimize O and OO performance; (2) Identifying structural features of lignin that enhance reactivity towards EOD of high kappa pulps; (3) Identifying factors minimizing carbohydrate degradation and improve pulp strength of EOD high kappa pulps; (4) Developing a simple, reproducibl… more
Date: September 30, 2005
Creator: Ragauskas, Arthur J.; Lucia, Lucian A. & Jameel, Hasan
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
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Mill-designed biobleaching technologies

Description: Biobleaching studies are ongoing, we are currently screening new organic and inorganic mediators for laccase catalyzed delignification of kraft pulps. We have established the performance of current laccase-mediator systems with respect to delignification, yield, and changes in lignin structure.
Date: September 30, 1999
Creator: Ragauskas, Dr. A.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Final Report ''Model-Based Approach to Soft-Sensing and Diagnosis for Control of a Continuous Digester''

Description: The goal of the work was to develop and demonstrate computing based modeling and control methodologies that will facilitate integrated operations on the continuous pulp digester. The technical work required to achieve these goals included development of efficient methods for soft-sensing using fundamental models, integration of fault monitoring and control algorithms, and the development of computationally feasible formulations of model predictive control for profile management in the digester.… more
Date: June 1, 2003
Creator: III, Francis J. Doyle
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

High-efficiency chlorine dioxide delignification. Summary of progress, April 1--June 30, 1998

Description: The authors have been pursuing strategies for improving the efficiency of utilization and environmental performance of ClO{sub 2} in the delignification of kraft pulps. These strategies combine a pretreatment followed by ClO{sub 2} treatment under conditions selected to result in high efficiency, and a suitably altered alkaline extraction stage. In addition, a series of experiments was completed in which the authors compared the response to conventional D(EO) delignification of conventional kra… more
Date: July 31, 1998
Creator: Ragauskas, Arthur J. & McDonough, Thomas J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Fractionation of Loblolly Pine Woodchips Into Pulp For Making Paper Products

Description: The overall goal of the project was to test the PureVision biomass fractionation technology for making pulp from loblolly pine. A specific goal was to produce a pulp product that is comparable to pulp produced from the kraft process, while reducing the environmental effects of the kraft process, known to be a highly pollutant process. The overall goal of the project was met by using the biomass fractionation concept for making pulp product. This proof-of-concept study, done with Southern pine p… more
Date: November 30, 2006
Creator: Kiran Kadam, PhD
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Xylan Delignification Process for biomass conversion to ethanol

Description: An extrusion process melded with alkaline peroxide chemical pretreatements allows the lignin and hemicellulose in biomass to be solublibzed, and the cellulose component to be made available for enzymatic breakdown. This process is called the Xylan Delignification Process (XDP). In this paper, some results of the XDP on promoting enzymatic breakdown and SSF of corn stalks switch grass and straw are reported. It was found that the XDP process allowed quick (6 hour) and reasonably complete (85--88… more
Date: October 1, 1995
Creator: Dale, M.C.; Zhao, C.; Lei, S. & Tyson, G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Fundamental Investigations of C1O2 Delignification - Final Report - 07/10/1996 - 07/09/1999

Description: The overall objective of this project was to develop a fundamental understanding of the mechanisms of chlorine dioxide delignification of low kappa kraft pulps and identify new methods of improving the efficiency and effectiveness of this bleaching agent. The approach adopted was to investigate the fundamental structural components of lignin that contribute to delignification reactions with chlorine dioxide. These results were then used to examine new bleaching technologies that will permit enh… more
Date: May 18, 2001
Creator: Ragauskas, Arthur J. & McDonough, T. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Understanding the Nature and Reactivity of Residual Lignin for Improved Pulping and Bleaching Efficiency

Description: One of the most formidable challenges in kraft pulping to produce bleached chemical pulps is how to effectively remove the last 5-10% of lignin while maintaining the fiber quality. To avoid a severe fiber degradation, kraft pulping is usually terminated in the 25-30 kappa number range and then followed by an elementally chlorine free (ECF) or a totally chlorine free (TCF) bleaching sequence to reduce the environmental impacts.
Date: November 30, 2001
Creator: Lai, Yuan-Zong
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Mill Designed Bio bleaching Technologies

Description: A key finding of this research program was that Laccase Mediator Systems (LMS) treatments on high-kappa kraft could be successfully accomplished providing substantial delignification (i.e., > 50%) without detrimental impact on viscosity and significantly improved yield properties. The efficiency of the LMS was evident since most of the lignin from the pulp was removed in less than one hour at 45 degrees C. Of the mediators investigated, violuric acid was the most effective vis-a-vis delignif… more
Date: January 30, 2004
Creator: Technology, Institute of Paper Science
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Screening Study for Waste Biomass to Ethanol Production Facility Using the Amoco Process in New York State. Appendices to the Final Report

Description: The final report evaluates the economic feasibility of locating biomass-to-ethanol waste conversion facilities in New York State. Part 1 of the study evaluates 74 potential sites in New York City and identifies two preferred sites on Staten Island, the Proctor and Gamble and the Arthur Kill sites for further consideration. Part 2 evaluates upstate New York and determines that four regions surrounding the urban centers of Albany, Buffalo, Rochester, and Syracuse provide suitable areas from which… more
Date: August 1, 1995
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Producing a True Lignin Depolymerase for Biobleaching Softwood Kraft Pulp

Description: This project constituted an intensive effort devoted to producing, from the white-rot fungus Tramets Cingulata, a lignin degrading enzyme (lignin depolymerase) that is directly able to biobleach or delignify softwood kraft pulp brownstock. To this end, the solutions in which T. cingulata was grown contained dissolved kraft lignin which fulfilled two functions; it behaved as a lignin deploymerase substrate and it also appeared to act as an inducer of enzyme expression. However, the lignin depoly… more
Date: February 4, 2002
Creator: Sarkanen, Simo
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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High Selectivity Oxygen Delignification

Description: Project Objective: The objectives of this project are as follows: (1) Examine the physical and chemical characteristics of a partner mill pre- and post-oxygen delignified pulp and compare them to lab generated oxygen delignified pulps; (2) Apply the chemical selectivity enhancement system to the partner pre-oxygen delignified pulps under mill conditions (with and without any predetermined amounts of carryover) to determine how efficiently viscosity is preserved, how well selectivity is enhanced… more
Date: November 15, 2005
Creator: Lucia, Lucian A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Twenty-second Fungal Genetics Conference - Asilomar, 2003

Description: The purpose of the Twenty Second Fungal Genetics Conference is to bring together scientists and students who are interested in genetic approaches to studying the biology of filamentous fungi. It is intended to stimulate thinking and discussion in an atmosphere that supports interactions between scientists at different levels and in different disciplines. Topics range from the basic to the applied. Filamentous fungi impact human affairs in many ways. In the environment they are the most importan… more
Date: June 30, 2003
Creator: Walton, Jonathan D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Screening Study for Waste Biomass to Ethanol Production Facility Using the Amoco Process in New York State. Final Report

Description: This report evaluates the economic feasibility of locating biomass-to-ethanol waste conversion facilities in New York State. Part 1 of the study evaluates 74 potential sites in New York City and identifies two preferred sites on Staten, the Proctor Gamble and the Arthur Kill sites, for further consideration. Part 2 evaluates upstate New York and determines that four regions surrounding the urban centers of Albany, Buffalo, Rochester, and Syracuse provide suitable areas from which to select spec… more
Date: August 1, 1995
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

DOEGO85004_1: Final Non-proprietary Technical Report, Generating Process and Economic Data for Preliminary Design of PureVision Biorefineries DOEGO85004_2: One Original Final Proprietary Technical Report to be mailed to DOE Golden.

Description: The overall objective of the project was to define a two-stage reactive fractionation process for converting corn stover into a solid cellulose stream and two liquid streams containing mostly hemicellulosic sugars and lignin, respectively. Toward this goal, biomass fractionation was conducted using a small continuous pilot unit with a nominal capacity of 100 pounds per day of dry biomass to generate performance data using primarily corn stover as feedstock. In the course of the program, the Pur… more
Date: January 17, 2008
Creator: Kadam, Kiran L., Ph.D & Lehrburger, Ed
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Bioconversion of plant biomass to ethanol. Annual report and revised research plan, January 1977--January 1978

Description: The objective of this research is to demonstrate on a laboratory scale the technical feasibility of the direct microbial conversion of pretreated wood to ethanol. During the first year of this contract, we investigated the feasibility of biologically delignifying wood with C. pruinosum and directly fermenting the pretreated wood to ethanol with a mixed culture. Bench-top fermentations of a thermophilic bacillus growing on glucose and of a mixed culture of thermophilic sporocytophaga (US) and a … more
Date: March 23, 1978
Creator: Brooks, R.E.; Bellamy, W.D. & Su, T.M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Biological production of liquid fuels from biomass

Description: A scheme for the production of liquid fuels from renewable resources such as poplar wood and lignocellulosic wastes from a refuse hydropulper was investigated. The particular scheme being studied involves the conversion of a cellulosic residue, resulting from a solvent delignified lignocellulosic feed, into either high concentration sugar syrups or into ethyl and/or butyl alcohol. The construction of a pilot apparatus for solvent delignifying 150 g samples of lignocellulosic feeds was completed… more
Date: unknown
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Biological production of liquid fuels from biomass. Annual report, September 1, 1978-August 31, 1979

Description: The production of liquid fuels from renewable resources such as poplar wood and lignocellulosic wastes from a refuse hydropulper were studied. The particular scheme being studied involves the conversion of a cellulosic residue, resulting from a solvent delignified lignocellulosic feed, into either high concentration sugar syrups or into ethyl and/or butyl alcohol. The process is aimed at achieving total raw material utilization and maximization of high value by-product recovery. Specific goals … more
Date: January 1, 1979
Creator: Pye, E.K. & Humphrey, A.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Bioconversion of plant biomass to ethanol. Third quarterly and bimonthly report, July 1--September 30, 1977

Description: The studies of biological delignification have focused on the adaptation of the lignocellulosic thermophilic mold Chrysosporium pruinosum to growth on maple wood fibers. The addition of trace elements and thiamine hydrochloride to the C. pruinosum growth medium has been found to stimulate culture growth by a factor of about two. The nutritional salt tolerances of C. pruinosum have been determined. Nutrient concentrations below of about 2.5 times that required to support C. pruinosum growth have… more
Date: October 1, 1977
Creator: Brooks, R.E.; Bellamy, W.D. & Su, T.M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Effect of nitrogen oxide pretreatments on enzymatic hydrolysis of cellulose

Description: This work considers the effect of nitrogen oxide pretreatments on the subsequent enzymatic hydrolysis by Trichoderma viride cellulase of the cellulose occurring in wheat straw; Triticum Aestivum-L, em. Thell. In the pretreatment scheme the straw is first reacted with nitric oxide and air, and then extracted in aqueous solution. In this way, overall sugar yields increased from 17% for the case of no pretreatment to 70%. The glucose yield increased from 20 to 60%. The yield of glucose during enzy… more
Date: September 1, 1978
Creator: Borrevik, R. K.; Wilke, C. R. & Brink, D. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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