Adsorption of Pure Methane, Nitrogen, and Carbon Dioxide and Their Mixtures on San Juan Basin Coal (open access)

Adsorption of Pure Methane, Nitrogen, and Carbon Dioxide and Their Mixtures on San Juan Basin Coal

The major objectives of this project were to (a) measure the adsorption behavior of pure methane, nitrogen, CO{sub 2} and their binary and ternary mixtures on wet Tiffany coal at 130 F and pressures to 2000 psia; (b) correlate the equilibrium adsorption isotherm data using the extended Langmuir model, the Langmuir model, the loading ratio correlation and the Zhou-Gasem-Robinson equation of state; and (c) establish sorption-time estimates for the pure components. Specific accomplishments are summarized below regarding the complementary tasks involving experimental work and data correlation. Representative coal samples from BP Amoco Tiffany Injection Wells No.1 and No.10 were prepared, as requested. The equilibrium moisture content and particle size distribution of each coal sample were determined. Compositional coal analyses for both samples were performed by Huffman Laboratories, Inc. Pure gas adsorption for methane on wet Tiffany coal samples from Injection Wells No.1 and No.10 was measured separately at 130 F (327.6 K) and pressures to 2000 psia (13.7 MPa). The average expected uncertainty in these data is about 3% (9 SCF/ton). Our measurements indicate that the adsorption isotherms of the two coal samples exhibit similar Langmuir-type behavior. For the samples from the two wells, a maximum variation of about 5% …
Date: March 1, 2002
Creator: Gasem, K. A. M.; Robinson, R. L. & Reeves, S. R.
Object Type: Report
System: The UNT Digital Library
Modeling Coal Matrix Shrinkage and Differential Swelling with CO2 Injection for Enhanced Coalbed Methane Recovery and Carbon Sequestration Applications (open access)

Modeling Coal Matrix Shrinkage and Differential Swelling with CO2 Injection for Enhanced Coalbed Methane Recovery and Carbon Sequestration Applications

Matrix shrinkage and swelling can cause profound changes in porosity and permeability of coalbed methane reservoirs during depletion or when under CO{sub 2} injection processes, with significant implication for primary or enhanced methane recovery. Two models that are used to describe these effects are discussed. The first was developed by Advanced Resources International (ARI) and published in 1990 by Sawyer, et al. The second model was published by Palmer and Mansoori in 1996. This paper shows that the two provide equivalent results for most applications. However, their differences in formulation cause each to have relative advantages and disadvantages under certain circumstances. Specifically, the former appears superior for undersaturated coalbed methane reservoirs while the latter would be better if a case is found where matrix swelling is strongly disproportional to gas concentration. Since its presentation in 1996, the Palmer and Mansoori model has justifiably received much critical praise. However, the model developed by ARI for the COMET reservoir simulation program has been in use since 1990, and has significant advantages in certain settings. A review of data published by Levine in 1996 reveals that carbon dioxide causes a greater degree of coal matrix swelling compared to methane, even when measured on …
Date: March 31, 2002
Creator: Pekot, L. J. & Reeves, S. R.
Object Type: Report
System: The UNT Digital Library
Rainwater Wildlife Area, Watershed Management Plan, A Columbia Basin Wildlife Mitigation Project, 2002. (open access)

Rainwater Wildlife Area, Watershed Management Plan, A Columbia Basin Wildlife Mitigation Project, 2002.

This Management Plan has been developed by the Confederated Tribes of the Umatilla Indian Reservation (CTUIR) to document how the Rainwater Wildlife Area (formerly known as the Rainwater Ranch) will be managed. The plan has been developed under a standardized planning process developed by the Bonneville Power Administration (BPA) for Columbia River Basin Wildlife Mitigation Projects (See Appendix A and Guiding Policies Section below). The plan outlines the framework for managing the project area, provides an assessment of existing conditions and key resource issues, and presents an array of habitat management and enhancement strategies. The plan culminates into a 5-Year Action Plan that will focus our management actions and prioritize funding during the Fiscal 2001-2005 planning period. This plan is a product of nearly two years of field studies and research, public scoping, and coordination with the Rainwater Advisory Committee. The committee consists of representatives from tribal government, state agencies, local government, public organizations, and members of the public. The plan is organized into several sections with Chapter 1 providing introductory information such as project location, purpose and need, project goals and objectives, common elements and assumptions, coordination efforts and public scoping, and historical information about the project area. Key …
Date: March 1, 2002
Creator: Childs, Allen B.
Object Type: Report
System: The UNT Digital Library
WIPP Facility Work Plan for Solid Waste Management Units and Areas of Concern (open access)

WIPP Facility Work Plan for Solid Waste Management Units and Areas of Concern

his 2002 Facility Work Plan (FWP) has been prepared as required by Module VII,Permit Condition VII.U.3 of the Waste Isolation Pilot Plant (WIPP) Hazardous Waste Facility Permit, NM4890139088-TSDF (the Permit) (New Mexico Environment Department [NMED], 1999a), and incorporates comments from the NMED received onDecember 6, 2000 (NMED, 2000a). This February 2002 FWP describes the program-matic facility-wide approach to future investigations at Solid Waste Management Units (SWMU) and Areas of Concern (AOC) specified in the Permit. The Permittees are evaluating data from previous investigations of the SWMUs and AOCs against the mostrecent guidance proposed by the NMED. Based on these data, and completion of the August 2001 sampling requested by the NMED, the Permittees expect that no further sampling will be required and that a request for No Further Action (NFA) at the SWMUs and AOCs will be submitted to the NMED. This FWP addresses the current Permit requirements. It uses the results of previous investigations performed at WIPP and expands the investigations as required by the Permit. As an alternative to the Resource Conservation and Recovery Act (RCRA)Facility Investigation (RFI) specified in Module VII of the Permit, current NMED guidance identifies an Accelerated Corrective Action Approach (ACAA) that may beused …
Date: March 5, 2002
Creator: Westinghouse TRU Solutions LLC
Object Type: Report
System: The UNT Digital Library
Limitations on High Data Rate Optical Fiber Transmission Systems Due to Transmission Impairment (open access)

Limitations on High Data Rate Optical Fiber Transmission Systems Due to Transmission Impairment

This project supplemented our regular DOE grant from the Basic Energy Sciences organization with the goal of fostering industrial partnerships and student internships. During the project period, we have interacted with between 15 and 20 companies in the optical fiber telecommunications equipment industry, and our students have participated in a number of highly visible projects with companies such as Ciena, Science Applications International Corporation, KDD, ATT, Virtual Photonics, Inc., Phaethon Telecommunications, PhotonEx, and others. The project led to many successful interactions and numerous job offers for our students.
Date: March 15, 2002
Creator: Menyuk, Curtis R.
Object Type: Report
System: The UNT Digital Library
Quality Assurance Program Plan for TRUPACT-II Gas Generation Test Program (open access)

Quality Assurance Program Plan for TRUPACT-II Gas Generation Test Program

The Gas Generation Test Program (GGTP), referred to as the Program, is designed to establish the concentration of flammable gases and/or gas generation rates in a test category waste container intended for shipment in the Transuranic Package Transporter-II (TRUPACT-II). The phrase "gas generationtesting" shall refer to any activity that establishes the flammable gas concentration or the flammable gas generation rate. This includes, but is not limited to, measurements performed directly on waste containers or during tests performed on waste containers. This Quality Assurance Program Plan (QAPP) documents the quality assurance (QA) and quality control (QC) requirements that apply to the Program. The TRUPACT-II requirements and technical bases for allowable flammable gas concentration and gas generation rates are described in the TRUPACT-II Authorized Methods for Payload Control (TRAMPAC).
Date: March 1, 2002
Creator: Office, Carlsbad Field
Object Type: Report
System: The UNT Digital Library
WIPP Facility Work Plan for Solid Waste Management Units and Areas of Concern (open access)

WIPP Facility Work Plan for Solid Waste Management Units and Areas of Concern

This 2002 Facility Work Plan (FWP) has been prepared as required by Module VII, Permit Condition VII.U.3 of the Waste Isolation Pilot Plant (WIPP) Hazardous Waste Facility Permit, NM4890139088-TSDF (the Permit) (New Mexico Environment Department [NMED], 1999a), and incorporates comments from the NMED received on December 6, 2000 (NMED, 2000a). This February 2002 FWP describes the programmatic facility-wide approach to future investigations at Solid Waste Management Units (SWMU) and Areas of Concern (AOC) specified in the Permit. The Permittees are evaluating data from previous investigations of the SWMUs and AOCs against the most recent guidance proposed by the NMED. Based on these data, and completion of the August 2001 sampling requested by the NMED, the Permittees expect that no further sampling will be required and that a request for No Further Action (NFA) at the SWMUs and AOCs will be submitted to the NMED. This FWP addresses the current Permit requirements. It uses the results of previous investigations performed at WIPP and expands the investigations as required by the Permit. As an alternative to the Resource Conservation and Recovery Act (RCRA) Facility Investigation (RFI) specified in Module VII of the Permit, current NMED guidance identifies an Accelerated Corrective Action Approach …
Date: March 5, 2002
Creator: Westinghouse TRU Solutions LLC
Object Type: Report
System: The UNT Digital Library
Analysis of Induced Gas Released During Retrieval of Hanford Double-Shell Tank Waste (open access)

Analysis of Induced Gas Released During Retrieval of Hanford Double-Shell Tank Waste

Radioactive waste is scheduled to be retrieved from Hanford double-shell tanks AN-103, AN-104, AN-105 and AW-101 to the vitrification plant beginning about 2009. Retrieval may involve decanting the supernatant liquid and/or mixing the waste with jet pumps. In these four tanks, which contain relatively large volumes of retained gas, both of these operations are expected to induce buoyant displacement gas releases that can potentially raise the tank headspace hydrogen concentration to very near the lower flammability limit. This report describes the theory and detailed physical models for both the supernate decant and jet mixing processes and presents the results from applying the models to these operations in the four tanks. The technical bases for input parameter distributions are elucidated.
Date: March 20, 2002
Creator: Wells, Beric E. (BATTELLE (PACIFIC NW LAB)); Cuta, Judith M. (BATTELLE (PACIFIC NW LAB)); Hartley, Stacey A. (BATTELLE (PACIFIC NW LAB)); Mahoney, Lenna A. (BATTELLE (PACIFIC NW LAB)); Meyer, Perry A. (BATTELLE (PACIFIC NW LAB)) & Stewart, Charles W. (BATTELLE (PACIFIC NW LAB))
Object Type: Report
System: The UNT Digital Library
International Performance Measurement and Verification Protocol: Concepts and Options for Determining Energy and Water Savings, Volume I (Revised) (open access)

International Performance Measurement and Verification Protocol: Concepts and Options for Determining Energy and Water Savings, Volume I (Revised)

This protocol serves as a framework to determine energy and water savings resulting from the implementation of an energy efficiency program. It is also intended to help monitor the performance of renewable energy systems and to enhance indoor environmental quality in buildings.
Date: March 1, 2002
Creator: unknown
Object Type: Report
System: The UNT Digital Library
RCRA Assessment Plan for Single-Shell Tank Waste Management Area T at the Hanford Site, Interim Change Notice 1 (open access)

RCRA Assessment Plan for Single-Shell Tank Waste Management Area T at the Hanford Site, Interim Change Notice 1

This interim change notice updates the assessment plan to refelct the current wells in the monitoring system and the current constituent list for Waste Management Area T.
Date: March 5, 2002
Creator: Horton, Duane G.
Object Type: Report
System: The UNT Digital Library
International Performance Measurement & Verification Protocol: Concepts and Practices for Improved Indoor Environmental Quality, Volume II (Revised) (open access)

International Performance Measurement & Verification Protocol: Concepts and Practices for Improved Indoor Environmental Quality, Volume II (Revised)

This protocol serves as a framework to determine energy and water savings resulting from the implementation of an energy efficiency program. It is also intended to help monitor the performance of renewable energy systems and to enhance indoor environmental quality in buildings.
Date: March 1, 2002
Creator: unknown
Object Type: Report
System: The UNT Digital Library
National Renewable Energy Laboratory 2001 Information Resources Catalog (open access)

National Renewable Energy Laboratory 2001 Information Resources Catalog

The National Renewable Energy Laboratory's (NREL) eighth annual Information Resources Catalog can help keep you up-to-date on the research, development, opportunities, and available technologies in energy efficiency and renewable energy. The catalog includes five main sections with entries grouped according to subject area.
Date: March 1, 2002
Creator: unknown
Object Type: Book
System: The UNT Digital Library
Value of Distributed Energy Options for Congested Transmission/Distribution Systems in the Southeastern United States: Mississippi and Florida Case Studies; January 1999-December 2001 (open access)

Value of Distributed Energy Options for Congested Transmission/Distribution Systems in the Southeastern United States: Mississippi and Florida Case Studies; January 1999-December 2001

This report explores the ability of distributed generation (DG) options to provide cost-effective alternatives to central station generation, transmission, and distribution upgrades for alleviating transmission and distribution congestion. The need for this study was driven by three major factors: (1) DOE's DG program, while quite successful in showing the value of DG in large portions of the United States, has been less successful in the Southeast, likely because of the low energy prices, high excess electrical capacity, and lack of electricity deregulation in the region. (2) Lack of DG-related analysis that uses real world data on specific sites that can be used as good indicators of the issues and benefits of DG. (3) Interest on behalf of DOE in analysis in two southern states that can be used to show the value of DG to several key Congressional officials from the states. To demonstrate this ability for constrained sites in systems in the states of Florida and Mississippi, the Electricity Asset Evaluation Model (EAEM) is used to assess the costs and benefits of installing DG options to reduce load in areas with transmission congestion versus upgrading the transmission and distribution (T&D) systems.
Date: March 1, 2002
Creator: McCusker, S. A. & Siegel, J. S.
Object Type: Report
System: The UNT Digital Library
Search for the Factors Determining the Photodegradation in High Efficiency a-Si:H Solar Cells: Final Subcontract Report, 28 January 1998 - 15 August 2001 (open access)

Search for the Factors Determining the Photodegradation in High Efficiency a-Si:H Solar Cells: Final Subcontract Report, 28 January 1998 - 15 August 2001

This report describes continuing studies on photoluminescence (PL), electroluminescence (EL), Raman, and nuclear magnetic resonance (NMR) by the University of North Carolina-Chapel Hill during the three years and the extension period. Systematic studies on the transition materials and their solar cells and a review of the photo-induced structural changes in correlation to the electronic degradation have led to better understanding of the factors determining the photodegradation in a-Si:H solar cells. NHR established significant differences, as in the bonding of hydrogen in the hot-wire- and plasma-deposited amorphous silicon.
Date: March 1, 2002
Creator: Han, D.
Object Type: Report
System: The UNT Digital Library
Connecting to the Internet Securely: Windows 2000 CIAC-2321 (open access)

Connecting to the Internet Securely: Windows 2000 CIAC-2321

As the threat to computer systems increases with the increasing use of computers as a tool in daily business activities, the need to securely configure those systems becomes more important. There are far too many intruders with access to the Internet and the skills and time to spend compromising systems to not spend the time necessary to securely configure a system. Hand-in-hand with the increased need for security are an increased number of items that need to be securely configured. Windows 2000 has about seven hundred security related policy settings, up from seventy two in Windows NT. While Windows 2000 systems are an extension of the Windows NT 4 architecture, there are considerable differences between these two systems, especially in terms of system and security administration. Operational policy, system security, and file security are other areas where Windows 2000 has expanded considerably beyond the domain model of Windows NT 4. The Windows NT 4 Domain model consists of domains of workstations that, with a single login, share resources and are administered together. The database of user settings and credentials resides in the domain server. Domains can trust other domains to expand the sharing of resources between users of multiple domains. …
Date: March 12, 2002
Creator: Orvis, W; Call, K & Dias, J
Object Type: Report
System: The UNT Digital Library
Tiger Teams Technical Assistance: Reliable, Universal Open Architecture for Card Access to Dispense Alternative Fuels (open access)

Tiger Teams Technical Assistance: Reliable, Universal Open Architecture for Card Access to Dispense Alternative Fuels

Report discusses the dilemma of incorporating consistent, convenient, universal card access (or ''pay-at-the-pump'') systems into alternative fueling stations across the country. The state of California continues to be in the forefront of implementing alternative fuels for transportation applications. Aggressive efforts to deploy alternative fuel vehicles (AFVs) in California have highlighted the need to provide adequate fueling stations and develop appropriate, user-friendly means to purchase fuel at the pump. Since these fuels are not typically provided by petroleum companies at conventional fueling stations, and acceptance of cash is often not an option, a payment method must be developed that is consistent with the way individual AFV operators are accustomed to purchasing automotive fuels--with a credit card. At the same time, large fleets like the California Department of General Services must be able to use a single fuel card that offers comprehensive fleet management services. The Gas Technology Institute's Infrastructure Working Group (IWG) and its stakeholders have identified the lack of a common card reader system as a hurdle to wider deployment of AFVs in California and the United States. In conjunction with the U.S. Department of Energy's (DOE) National Clean Cities Program, the IWG has outlined a multi-phased strategy to systematically …
Date: March 1, 2002
Creator: unknown
Object Type: Report
System: The UNT Digital Library
Additional Steam Traps Increase Production of a Drum Oven at a Petroleum Jelly Plant (open access)

Additional Steam Traps Increase Production of a Drum Oven at a Petroleum Jelly Plant

Additional steam traps were installed on the drum oven at a petroleum jelly production facility at an ExxonMobil plant in Nigeria. The installation improved heat transfer and saved energy.
Date: March 1, 2002
Creator: United States. Department of Energy. Office of Energy Efficiency and Renewable Energy. Office of Industrial Technologies.
Object Type: Text
System: The UNT Digital Library
A Parallel Multigrid Method for the Finite Element Analysis of Mechanical Contact (open access)

A Parallel Multigrid Method for the Finite Element Analysis of Mechanical Contact

A geometrical multigrid method for solving the linearized matrix equations arising from node-on-face three-dimensional finite element contact is described. The development of an efficient implementation of this combination that minimizes both the memory requirements and the computational cost requires careful construction and storage of the portion of the coarse mesh stiffness matrices that are associated with the contact stiffness on the fine mesh. The multigrid contact algorithm is parallelized in a manner suitable for distributed memory architectures: results are presented that demonstrates the scheme's scalability. The solution of a large contact problem derived from an analysis of the factory joints present in the Space Shuttle reusable solid rocket motor demonstrates the usefulness of the general approach.
Date: March 21, 2002
Creator: Hales, J. D. & Parsons, I. D.
Object Type: Report
System: The UNT Digital Library
The Multi-Scale Model Approach to Thermohydrology at Yucca Mountain (open access)

The Multi-Scale Model Approach to Thermohydrology at Yucca Mountain

The Multi-Scale Thermo-Hydrologic (MSTH) process model is a modeling abstraction of them1 hydrology (TH) of the potential Yucca Mountain repository at multiple spatial scales. The MSTH model as described herein was used for the Supplemental Science and Performance Analyses (BSC, 2001) and is documented in detail in CRWMS M&O (2000) and Glascoe et al. (2002). The model has been validated to a nested grid model in Buscheck et al. (In Review). The MSTH approach is necessary for modeling thermal hydrology at Yucca Mountain for two reasons: (1) varying levels of detail are necessary at different spatial scales to capture important TH processes and (2) a fully-coupled TH model of the repository which includes the necessary spatial detail is computationally prohibitive. The MSTH model consists of six ''submodels'' which are combined in a manner to reduce the complexity of modeling where appropriate. The coupling of these models allows for appropriate consideration of mountain-scale thermal hydrology along with the thermal hydrology of drift-scale discrete waste packages of varying heat load. Two stages are involved in the MSTH approach, first, the execution of submodels, and second, the assembly of submodels using the Multi-scale Thermohydrology Abstraction Code (MSTHAC). MSTHAC assembles the submodels in a …
Date: March 27, 2002
Creator: Glascoe, L.; Buscheck, T. A.; Gansemer, J. & Sun, Y.
Object Type: Report
System: The UNT Digital Library
Pressure Measurements in a PBX 9501 Gauged Acceptor When Impacted by a Steel Plate that is Accelerated by a Thermally Cooked Off PBX 9501 Charge (open access)

Pressure Measurements in a PBX 9501 Gauged Acceptor When Impacted by a Steel Plate that is Accelerated by a Thermally Cooked Off PBX 9501 Charge

Measuring the violence of a thermal explosion of a cased explosive is important for evaluating safety issues of explosive devices in fires. A sympathetic initiation scenario was studied here where a 9.0 cm diameter by 2.5 cm thick disc of PBX 9501 donor charge encased in a 304 stainless steel assembly was heated on top and bottom flat surfaces until it thermally exploded. The initial heating rate at the metal/explosive interface was 5 C per minute until it reaches 170 C; then this temperature is held for 35 minutes to allow temperature equilibration to within a few degrees throughout the explosive. The heating resumed at a rate of 1 C per minute until the PBX 9501 donor thermally exploded. A PBX 9501 acceptor charge with carbon resistor and manganin foil pressure gauges inserted at various depths was placed at a 10 cm standoff distance from the donor charge's top steel cover plate. Piezoelectric arrival time pins were placed in front of the acceptor surface to measure the velocity and shape of the impacting plate. The stainless steel cover plate of the donor charge had a nominal velocity of 0.55 {+-} 0.04 mm/{micro}s upon impact and was non-symmetrically warped. The impact …
Date: March 11, 2002
Creator: Forbes, J W; Garcia, F; Urtiew, P A; Vandersall, K S; Greenwood, D W & Tarver, C M
Object Type: Article
System: The UNT Digital Library
Local Integration of the National Atmospheric Release Advisory Center with Cities (LINC) (open access)

Local Integration of the National Atmospheric Release Advisory Center with Cities (LINC)

The objective of the ''Local Integration of the National Atmospheric Release Advisory Center with Cities'' (LINC) program is to demonstrate the capability for providing local government agencies with an advanced operational atmospheric plume prediction capability, which can be seamlessly integrated with appropriate federal agency support for homeland security applications. LINC is a Domestic Demonstration and Application Program (DDAP) funded by the Chemical and Biological National Security Program (CBNP), which is part of the Department of Energy's (DOE) National Nuclear Security Administration (NNSA). LINC will make use of capabilities that have been developed the CBNP, and integrated into the National Atmospheric Release Advisory Center (NARAC) at Lawrence Livermore National Laboratory (LLNL). NARAC tools services will be provided to pilot study cities and counties to map plumes from terrorism threats. Support to these local agencies will include training and customized support for exercises, special events, and general emergencies. NARAC provides tools and services that map the probable spread of hazardous material which have been accidentally or intentionally released into the atmosphere. Primarily supported by the DOE, NARAC is a national support and resource center for planning, real-time assessment and detailed studies of incidents involving a wide variety of hazards, including radiological, chemical, …
Date: March 25, 2002
Creator: Ermak, D L; Tull, J E & Mosley-Rovi, R
Object Type: Article
System: The UNT Digital Library
Impact of Enabling Technologies on Customer Load Curtailment Performance Summer 2001 Results from NYSERDA's PON 585 and 577 Programs and NYISO's Emergency Demand Response Program (open access)

Impact of Enabling Technologies on Customer Load Curtailment Performance Summer 2001 Results from NYSERDA's PON 585 and 577 Programs and NYISO's Emergency Demand Response Program

This report describes a market and load research study on a small group of participants in the NYISO Emergency Demand Response Program (EDRP) and the NYSERDA Peak Load Reduction and Enabling Technology Program Opportunity Notices. In-depth interviews were conducted with 14 individual customers that participated in the NYISO EDRP program through New York State Electric and Gas (NYSEG), AES NewEnergy, and eBidenergy/ ConsumerPowerLine. These contractors used funding from NYSERDA to apply enabling technologies that were hypothesized to improve customers' ability to curtail load. Both NYSEG and eBidenergy/ConsumerPowerLine offered their customers access to their hourly load data on a day-after basis and, during curtailment events, on a near-real-time basis. Phone interviews were conducted with most customers, however 25% of customers provided initial responses to the survey protocol via email. We then combined the market research information with load data during the curtailment events of August 7-10, 2001 to evaluate the impact of technology on curtailment responses.
Date: March 29, 2002
Creator: Goldman, Charles; Heffner, Grayson & Kintner-Meyer, Michael CW
Object Type: Report
System: The UNT Digital Library
Inspect and Repair Steam Traps: Office of Industrial Technologies (OIT) Steam Energy Tips No.1 (open access)

Inspect and Repair Steam Traps: Office of Industrial Technologies (OIT) Steam Energy Tips No.1

Tip sheet to help plants establish a program for the regular inspection, testing and repair of stream traps.
Date: March 1, 2002
Creator: unknown
Object Type: Text
System: The UNT Digital Library
Correlations of Polyimides and Blended Polyimides for High Temperature Gas Separations (open access)

Correlations of Polyimides and Blended Polyimides for High Temperature Gas Separations

High performance polymers are of interest for high temperature gas separations, especially for the sequestration of carbon dioxide. A new family of high performance imide polymers has been identified as a successful membrane capture material. VTEC polyimides possess desired thermal properties (up to 500 °C) along with being robust and flexible even after multiple thermal cycles (up to 400 °C). Polyimides (PI) are excellent materials for high selectivity for smaller kinetic diameter gases such as H2 and CO2; however, they have low fluxes. We blended small amounts of different polymers with VTEC polyimide, which changes the fluxes. Another critical problem when working with glassy polymers is their moisture content. It has been found that water entrapped within the polymer matrix (left over from the solvent, or physisorbed) can also cause the polymer to change dramatically. Additionally presence of molecular water in the polymer’s void volume has been validated through Positron Annihilation Lifetime (PAL) spectroscopy. In this presentation, polymer characterization and gas-separation testing results will be discussed.
Date: March 1, 2002
Creator: Klaehn, John R.; Orme, Christopher J.; Luther, Thomas A.; Peterson, Eric S. & Urban-Klaehn, Jagoda M.
Object Type: Article
System: The UNT Digital Library