AIChE – Central Florida Sand Key, FL Conference June 10, 2006 Continuous Ion Exchange for Fertilizer & Phosphate Applications Richard S. Dennis Separation Products Manager Tampa, FL Filtration Products Introduction Fertilizer/Phosphate Applications Introduction Introduction Fertilizer/Phosphate Applications Fertilizer/Phosphate Applications Continuous Ion Exchange – The “Higgins Loop” Specialized Applications for “Non Water” Processes Challenging Chemical Separations for Concentrated Solutions Purification, Product Recovery & Chemical Metathesis Fertilizer & Phosphate Installations NH 3 & NO 3 Recovery from Ammonium Nitrate Plant Wastewater Potassium Nitrate Production Phosphoric Acid Purification Potassium Carbonate Production Presentation Outline Ion Exchange Basics Higgins Loop™ Installations Principles of Operation Applications: Potassium Nitrates & Phosphates
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Continuous Ion Exchange – The “Higgins Loop”Specialized Applications for “Non Water” Processes Challenging Chemical Separations for Concentrated SolutionsPurification, Product Recovery & Chemical Metathesis
Fertilizer & Phosphate InstallationsNH3 & NO3 Recovery from Ammonium Nitrate Plant WastewaterPotassium Nitrate ProductionPhosphoric Acid PurificationPotassium Carbonate Production
Severn Trent ServicesSevern Trent ServicesThe CompanyThe Company
Environmental Services CompanyOver $600 Million in Annual US Sales5,000 Employees WorldwideHeadquarters - Fort Washington, PA Part of Severn Trent Plc - Birmingham, U.K.
Resin Rinsing – Between Adsorption & Regeneration2-5 Bed Volumes to Recover Product or Minimize ContaminationProduct / Regenerant Dilution
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FiltrationProducts
Continuous Ion ExchangeFeatures & Benefits
Continuous Ion ExchangeContinuous Ion ExchangeFeatures & BenefitsFeatures & Benefits
Separation Process PrinciplesContinuous & Countercurrent ProcessResin Flow Controlled with Process LiquidsBed Depth Limited only by Active Mass Transfer Zone (MTZL)Fresh Resin Moved Frequently into These “I-X” Zones
Ion Exchange BenefitsResin Working Capacity & Ion Selectivity OptimizedHigh Regeneration Product Strenghs & Low VolumesMore Efficient Regenerant UsageLow Liquid/Resin Treatment Ratios (<1) – Remove up to 150,000 ppm
Resin Rinsing BenefitsCountercurrent Contacting Minimizes Water - <1 Bed VolumeIncreased Product Recovery & Minimum Dilution
FiltrationProducts
Higgins Loop™Continuous Ion Exchange
Higgins Loop™Continuous Ion Exchange
BACKGROUNDBACKGROUND
Invented by Irwin Higgins in 1951 at ORNL (AEC)Focus on Radioactive Ion Separations with I-X Resins
Designed for Continuous, Selective Ion Separations
Applies Countercurrent Liquid/Resin Contacting to Ion Exchange
Commercialized in 1955; Acquired by Severn Trent (Tetra) in 1991
Alternative to Solvent Extraction, Fixed Bed I-X & Precipitation
Over 5 Decades of Experience
CCIXTM - Continuous Countercurrent Ion ExchangeReferenced as the “Higgins Contactor” in Handbooks
Chemical, Mining, Nuclear & Municipal Industries
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FiltrationProducts
LOOP CONFIGURATIONLOOP CONFIGURATION
Higgins Loop™Higgins LoopHiggins Loop™™
C
D A
B
Pulse - Controls Resin Flow through Loop
Backwash
Adsorption - Ion Loaded onto ResinAdsorption
Regeneration - Ion Desorbed from ResinBackwash - Fines & Solids Removal
Cylindrical Resin Loop4 Vessels Separated by Loop Valves
Operating Labor N/A 24.0 Hrs/Day $30 $216,000 Maintenance 2.5% of Capital Equip't $37,125 Depreciation on Total Capital of $2,673,000 10.0% of Capital $267,300
Subtotal $520,425
Total Costs $1,920,000 Investment Summary
Return on Investment 36% Annual Gross Profit: $950,000
Operating Factor of 300 Days/Yr or 82.2% TPY 100% Unit $ Total $________ _____ ______ Product Streams
Operating Labor N/A 24.0 Hrs/Day $30 $216,000 Maintenance 2.5% of Capital Equip't $37,125 Depreciation on Total Capital of $2,673,000 10.0% of Capital $267,300
Subtotal $520,425
Total Costs $1,920,000 Investment Summary
Return on Investment 36% Annual Gross Profit: $950,000
Testing & Design Higgins Loop™ & Other Pilot Testing @ STS TampaDesign by STS (Loop) & Engineering Firm
Severn Trent ParticipationDirection of Process Development & System Design
Testing by Client, USF Students or SubcontractTechnical Support for Commercial SystemHLS Technology License & Production Fees
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FiltrationProducts
Continuous I-X for Fertilizer ProductsSummary
Continuous I-X for Fertilizer ProductsSummary
HLS - Proven I-X Technology That Works5+ Decades of Experience in Specialized ProcessingReliable, Low Maintenance SystemFlexible Operation with PLC Controls & Qualify Monitoring
Produces Premium Fertilizers EconomicallyConvert Low Value Feedstocks into Value Added ProductsLow Capital Investment & Small System FootprintLiquid Fertilizer SolutionsDiversify FL Phosphate Plant Product Line
Favored Market Position Exclusive Rights to Proprietary ProcessAbility to Produce Customized Blends