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Mixing quality characterization in separations process tanks

Description: An experimental study has been performed on distribution of a dilute immiscible organic liquid dispersed in an aqueous phase contained baffled, paddle-agitated vessel, fitted with cooling coils. Acceptable total liquid levels in the vessel and minimum impeller speed were established for plant scale operation. Axial and radial distributions of the dispersed organic phase as functions of total liquid height, impeller speed, and the number of impellers were examined and some recurring trends were … more
Date: January 31, 1995
Creator: Hassan, N. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Environmental cleanup privatization, products and services directory, January 1997. Second edition

Description: The US Department of Energy has undertaken an ambitious ``Ten Year Plan`` for the Weapons Complex, an initiative to complete cleanup at most nuclear sites within a decade. This Second Edition of the Directory is designed to facilitate privatization which is key to the success of the Plan. The Directory is patterned after the telephone Yellow Pages. Like the Yellow Pages, it provides the user with points of contact for inquiring further into the capabilities of the listed companies. This edition… more
Date: January 1, 1997
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Characterization and recovery of solvent entrained during the use of centrifugal contactors.

Description: In this work, we determined how a decanter for the aqueous effluents would work for solvent extraction operations using a centrifugal contactor. Solvent entrainment was measured in the raffinate and strip aqueous effluents in the caustic-side solvent extraction (CSSX) process. Values were obtained for both the solvent concentration and its droplet size distribution. The mixing intensity of the two phases in the mixing zone of the contactor was used to simulate the performance of lab-scale, pilo… more
Date: June 27, 2002
Creator: Arafat, H. A.; Hash, M. C.; Hebden, A. S. & Leonard, R. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Improved resins and novel materials and methods for solid phase extraction and high performance liquid chromatography

Description: Solid-phase extraction (SPE) has grown to be one of the most widely used methods for isolation and preconcentration of a vast range of compounds from aqueous solutions. By modifying polymeric SPE resins with chelating functional groups, the selective uptake of metals was accomplished. The resin, along with adsorbed metals, was vaporized in the ICP and detection of the metals was then possible using either mass or emission spectroscopy. Drug analyses in biological fluids have received heightened… more
Date: October 8, 1997
Creator: Freeze, R.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
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Mass Transfer in 12-CM Centrifugal Contactors

Description: One eight-stage unit (8-pack) of centrifugal contactors was tested in both extraction and stripping modes. Efficiencies approaching 100 percent were obtained in both modes. The contactors were operated successfully at a wide range of combined flow rates, including the HEF conditions. This report discusses the results of that test.
Date: June 26, 2001
Creator: Chesna, J. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Removal of strontium-90 from calcined wastes with the SREX process

Description: Experiments have been performed to formulate chemical procedures for the processing of radioactive dissolved calcine wastes for the removal of {sup 90}Sr with the SREX (Strontium Extraction) solvent. Batch contact solvent extraction experiments have been performed to yield a processing scheme which is highly efficient for the extraction of Sr, while remaining free from insoluble precipitate formation and third phase formation. The effect of various scrubbing and stripping techniques and elevate… more
Date: December 31, 1997
Creator: Wood, D.J.; Mann, N.R.; Tillotson, R.; Tullock, P.A. & Todd, T.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Investigation of Emulsion Formation in Solvent Washing in the Caustic-Side Solvent Extraction (CSSX) Process

Description: The effects on phase separation and emulsion formation of variables present in the caustic washing of solvent in the caustic-side solvent extraction process have been investigated. The evaluation program was performed in two experiments; results of the first experiment were used to determine conditions for the second test. In the first experiment, the effects of solvent degradation product concentrations (4-sec-butylphenol and dioctylamine), wash solution NaOH concentration, and solvent-to-wash… more
Date: June 27, 2002
Creator: Birdwell, JR.J.F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Evaluation of Mass Transfer Performance for Caustic-Side Solvent Extraction of Cesium in a Conventional 5-cm Centrifugal Contactor

Description: Tests have been conducted to determine if satisfactory mass transfer performance is achieved using a fully pumping 5-cm centrifugal contactor under conditions present in the Caustic-Side Solvent Extraction (CSSX) process. Tests utilized a commercially available contactor that had been modified by installation of a rotor housing bottom that had straight radial vanes on the process side. As received from the vendor, the housing bottom was equipped with curved (impeller-type) vanes that were inten… more
Date: February 19, 2002
Creator: Birdwell, Jr. J.F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Evaluation of the effectiveness of the M-Area extraction system September 1985 to October 1986

Description: A groundwater extraction system designed to remove volatile organic compounds from groundwater has been in operation in the M-Area at the Savannah river Plant since September 1985. This extraction system has been operated at a rate of approximately 410 gallons per minute during the past year, and about 55,000 lbs of volatile organic compounds have been removed from groundwater during the first year of operation. The Raw Materials Engineering and Technology Department at the Savannah River Plant… more
Date: March 1, 1987
Creator: Jackson, D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Hydraulic Performance of a Multistage Array of Advanced Centrifugal Contactors

Description: The hydraulic characteristics of an advanced design centrifugal contactor array have been determined at the Savannah River Laboratory (SRL). The advanced design utilizes couette mixing (Taylor vortices) in the annulus between the rotating and stationary bowls. Excellent phase separation over a wide range of flow conditions was obtained. Interfaces within an entire eight-stage array were controlled with a single weir air pressure.
Date: May 29, 2001
Creator: Hodges, M.E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Entrainment of Solvent in Aqueous Stream from CINC V-5 Contactor

Description: Personnel completed a rapid study of organic entrainment during operation of a CINC V-5 contactor under prototypical conditions covering the range of expected MCU operation. The study only considered the entrainment of organic into the strip acid effluent destined for the Defense Waste Processing Facility. Based on this work, the following observations are noted: (1) Concentrations of total organic from the contactor discharge, based upon modifier measurements, in the acid typically averaged 33… more
Date: April 29, 2005
Creator: Fink, S. D.; Restivo, M. L.; Peters, T. B.; Fowley, M. D.; Burns, D. B.; Smith, W. M. Jr. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Advances in Development of the Fission Product Extraction Process for the Separation of Cesium and Strontium from Spent Nuclear Fuel

Description: The Fission Product Extraction (FPEX) Process is being developed as part of the United States Department of Energy Advanced Fuel Cycle Initiative for the simultaneous separation of cesium (Cs) and strontium (Sr) from spent light water reactor (LWR) fuel. Separation of the Cs and Sr will reduce the short-term heat load in a geological repository, and when combined with the separation of americium (Am) and curium (Cm), could increase the capacity of the geological repository by a factor of approx… more
Date: September 1, 2007
Creator: Law, JAck D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Evaluation of 5-cm Centrifugal Contactor Hydraulic and Mass Transfer Performance for Caustic-Side Solvent Extraction of Cesium

Description: A test program has been conducted in which the use of pilot-scale centrifugal solvent extraction contactors for cesium removal from an alkaline waste stream has been successfully demonstrated. The program was designed specifically to evaluate the use of centrifugal contactors having 5-cm-diam rotors for the removal of cesium from alkaline high-level waste (HLW) that was generated and is being stored at the U.S. Department of Energy's Savannah River Site (SRS). The removal of cesium from this wa… more
Date: September 12, 2001
Creator: Birdwell, J.F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Examination of Organic Carryover from 2-cm Contactors to Support the Modular CSSX Unit

Description: A bank of four 2-cm centrifugal contactors was operated in countercurrent fashion to help address questions about organic carryover for the Modular Caustic Side Solvent Extraction (CSSX) Unit (MCU). The contactors, having weirs sized for strip operation, were used to examine carryover for both strip effluent (SE) and decontaminated salt solution (DSS). Since only one bank of contactors was available in the short time frame of this work, the organic phase and only one aqueous phase were present … more
Date: April 29, 2005
Creator: Nash, Charles A.; Norato, Michael A.; Walker; Douglas, D.; Pierce, Robert A.; Eubanks, Ronnye A. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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CMP flowsheet development for the separation of actinides from ICPP sodium-bearing waste using centrifugal contactors

Description: Previous results of lab-scale batch contacts with sodium-bearing waste (SBW) simulant suggested a potential flowsheet for partitioning actinides using solvent extraction with dihexyl-N,N-diethylcarbamoylmethyl phosphonate (DHDECMP or simply CMP) as the extractant. The suggested baseline flowsheet includes: an extraction section to remove actinides from liquid SBW into the CMP solvent (0.75 M CMP, 1.0 M TBP in Isopar-L{reg_sign}); a thermally unstable complexant (TUCS) strip section to back-extr… more
Date: August 1, 1995
Creator: Law, J.D.; Herbst, R.S. & Rodriguez, A.M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Summary of canister overheating incident at the Carbon Tetrachloride Expedited Response Action site

Description: The granular activated carbon (GAC)-filled canister that overheated was being used to adsorb carbon tetrachloride vapors drawn from a well near the 216-Z-9 Trench, a subsurface disposal site in the 200 West Area of the Hanford Site. The overheating incident resulted in a band of discolored paint on the exterior surface of the canister. Although there was no other known damage to equipment, no injuries to operating personnel, and no releases of hazardous materials, the incident is of concern bec… more
Date: March 10, 1994
Creator: Driggers, S. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Solvent recovery from aqueous effluent using process diluent in the caustic-side solvent extraction (CSSX) process.

Description: In this work, solvent recovery from aqueous CSSX process raffinate effluent was tested using the process diluent (Isopar{reg_sign}L). A model was developed to obtain stage efficiency for the diluent contact stages. The model was used to fit experimental data from a 19.8-hr solvent recovery test. Diluent-in-aqueous entrainment was measured during the test. Vacuum distillation was used to concentrate the solvent components, BOBCalixC6 and modifier, in the diluent used in solvent recovery. Using t… more
Date: August 26, 2002
Creator: Arafat, H. A.; Falkenberg, J. R. & Leonard, R. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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SOLVEX: a computer program for simulation of solvent extraction processes

Description: SOLVEX is a FORTRAN IV computer program that simulates the dynamic behavior of solvent extraction processes conducted in mixer-settlers and centrifugal contactors. Two options permit terminating dynamic phases by time or by achieving steady state, and a third option permits artificial rapid close to steady state. Thus the program is well suited to multiple phases of dynamic problems and multiple input of steady state problems. Changes from the previous problem are the only inputs required for e… more
Date: September 1, 1975
Creator: Scotten, W.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Solvent extraction equipment evaluation study. Part 1. Review of the literature

Description: This is Part 1 of a three-part document that reviews the solvent extraction contactors available for use in radiochemical reprocessing plants. The three parts are: Part 1: A Review of the Literature, Part 2: Workshop Proceedings, Part 3: A Summary. The main objective of the document is to provide an information base to aid in contactor selection and design of future reprocessing plants. The Literature Review (Part 1) brings together scattered data on all major contactors in use today. It contai… more
Date: January 1, 1977
Creator: Geier, R. G. & Browne, L. M. (comps.)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Evaluation of the effectiveness of the M-Area extraction system

Description: The effect of the M-Area extraction system on groundwater flow patterns in the vicinity of the M-Area was investigated using the groundwater flow model of the A- and M-Areas developed by S. S. Papadopulos and Associates, Inc. The purpose of this investigation was to: (1) evaluate the performance of the extraction system, in terms of its capability to prevent migration of volatile organic chemicals from the M-Area, and (2) evaluate the length of time required to remove groundwater from the captu… more
Date: July 1, 1986
Creator: Jackson, D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Evaluation of an alkaline-side solvent extraction process for cesium removal from SRS tank waste using laboratory-scale centrifugal contactors

Description: An alkaline-side solvent extraction process for cesium removal from Savannah River Site (SRS) tank waste was evaluated experimentally using a laboratory-scale centrifugal contactor. Single-stage and multistage tests were conducted with this contactor to determine hydraulic performance, stage efficiency, and general operability of the process flowsheet. The results and conclusions of these tests are reported along with those from various supporting tests. Also discussed is the ability to scale-u… more
Date: November 29, 1999
Creator: Leonard, R. A.; Conner, C.; Liberatore, M. W.; Sedlet, J.; Aase, S. B. & Vandegrift, G. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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SODIUM ALUMINOSILICATE FOULING AND CLEANING OF DECONTAMINATED SALT SOLUTION COALESCERS

Description: During initial non-radioactive operations at the Modular Caustic Side Solvent Extraction Unit (MCU), the pressure drop across the decontaminated salt solution coalescer reached {approx}10 psi while processing {approx}1250 gallons of salt solution, indicating possible fouling or plugging of the coalescer. An analysis of the feed solution and the 'plugged coalescer' concluded that the plugging was due to sodium aluminosilicate solids. MCU personnel requested Savannah River National Laboratory (SR… more
Date: October 28, 2008
Creator: Poirier, M; Thomas Peters, T; Fernando Fondeur, F & Samuel Fink, S
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Cesium Removal from Savannah River Site Radioactive Waste Using the Caustic Side Solvent Extraction (CSSX) Process

Description: Researchers at the Savannah River Technology Center (SRTC) successfully demonstrated the Caustic-Side Solvent Extraction (CSSX) process flow sheet using a 33-stage, 2-cm centrifugal contactor apparatus in two 24-hour tests using actual high level waste. Previously, we demonstrated the solvent extraction process with actual SRS HLW supernatant solution using a non-optimized solvent formulation. Following that test, the solvent system was optimized to enhance extractant solubility in the diluent … more
Date: March 3, 2004
Creator: WALKER, DARREL
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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