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The Concept of the Basic Liquid

The Concept of the Basic Liquid. 技術研討資料. 主講人 : 龍仁生. The key point to the filter Filter Cartridge Filter type Depth fiber, Membrane, Hollow Fiber… Filter Device Membrane, Support… Membrane Characteristic Retention Wet-ability --- De-wet Filter Housing SS, PFA, PVDF,PP …

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The Concept of the Basic Liquid

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  1. The Concept of the Basic Liquid 技術研討資料 主講人 : 龍仁生

  2. The key point to the filter • Filter Cartridge • Filter type • Depth fiber, Membrane, Hollow Fiber… • Filter Device • Membrane, Support… • Membrane Characteristic • Retention • Wet-ability --- De-wet • Filter Housing • SS, PFA, PVDF,PP… • How to choice an optimal filter Topics

  3. The key to filter in Chemica • The Filter pore size / Retention • How much ? 0.1um, 0.2um… • Lower filtration rate, Higher retention • The Chemical Compatibility / Pre-wetting • PTFE • UPE • PP • Nylon • Cleanness • Low Hold Volume

  4. Typical Depth Filter Structure

  5. Manufacturing Process Stretched Polymeric Membranes e.g. PTFE

  6. Manufacturing Process Cast Polymer Membranes e.g. PVDF

  7. Manufacturing Process Membranes Track Etched e.g. Polycarbonate

  8. "Pore size" (maximum pore size = "retention rating ) • The largest sized pores in a filter • "Porosity" • A measurement of the openness of a filter • i.e. 80% porosity equates to 80% open volume, 20% material • "Pore size distribution" • The range and frequency of pore sizes which make up a the filter Membrane Characteristics That is why HA

  9. Permeate Flow Path Inlet Flow Path • Filter "pack" contains membrane, plus upstream & downstream fibrous supports. • Supports can be a source of particles . • Pulse pressure is a potential shedding source • It is not easy to prewet and flush. Typical Filtration Devices: Pleated Cartridges

  10. Permeate Fluid Flow Path Typical Filtration Devices: Stacked Disk Cartridges • Downstream components are rigid and cleaner than other membrane supports. • Excellent in pulse pressure shedding. • Horizontal disks prevent efficient gas venting

  11. Typical Filtration Devices: Hollow Fiber Cartridges • Filter area can be greater than pleated structure • Benefits of self-supporting, high surface area, high flow. • Used mostly in water filtration and photochemical. • Low pressure drop

  12. Filtration Retention Mechanisms: Capture by • Sieving / Interception --- • Hard Particle--- Bridge/ Cake effect • Soft –Gel/Micro-bubble Hard Particles Soft Particles

  13. + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + Capture by Adhesion / Adsorption Retention Mechanisms: • Very small particles in liquids have a negative charge and can be captured by attraction to a positive charge in a filter

  14. 過濾在時間的變化 particlel Time 壓差 Time

  15. Hydrophilic: • Wetting smoothly with, water.". • No pre-wetting • Hydrophobic: • Fear of water; • Tending not to combine with water. • Requires pre-wetting. Hydrophobic Vs Hydrophilic

  16. Hydrophobic Hydrophilic < 90? 90? > 90? No contact angle • Contact Angle is the measure of Wettability Hydrophobic Vs Hydrophilic i.e. Low contact angle = Hydrophobic High contact angle = Hydrophilic

  17. What is Dewetting and how can it impact a process? SC1 SC2 H2O2 NH4F Piranha

  18. QuickChange Filters are Non-Dewetting SC1 SC2 H2O2 NH4F Piranha Non-Dewetting Technology

  19. Vent Drain Prewetting • Flow in one direction (prevents air entrapment) • Flow from upstream side into core • 60:40 IPA water solution • Flush with DI water

  20. Filter Housing • POU typically single 10" filter housing • Materials of construction: • PFA, PVDF, PP, SS

  21. Inlet Typical Flow Path Outlet Filter Cartridge Housing T-Line Design In-line Design Inlet Outlet

  22. Inlet Typical Flow Path Outlet Filter Cartridge Housing T-Line Design In-line Design Inlet Outlet

  23. Bowl Down(top of the head points toward ceiling) • Easier to drain upstream side of filter • Air does not get trapped in core • Liquid remains in core after drain • 20" can be difficult to mount filters T-Line Mounting Considerations Inlet Outlet

  24. Bowl Up (top of the head points towards the floor) • Complete draining of filter core • Easy filter installation • Recommended configuration for 20" housings • Liquid drains from upstream side of filter • Must vent downstream side of housing T-Line Mounting Considerations Vent Drain

  25. Reduced Tool Space Required • A typical tool design requires enough space to lower the bowl below the cartridge for filter changeout. • With Chemlock, the bowl only needs to be lowered below the head, then the cartridge and bowl can be removed as a single unit. • Tool Space Savings - Approx. ~ 8 inches! • 18” in space savings with 20” bowl

  26. Vent Drain outlet Typical Disposable Filter Assembly Internal Filter Element inlet Connections : Flartek, Butt Weld, etc.

  27. Disposables Vs. Housings • Housings • Traditional design • Flexibility - 4" - 40" • Requires O-ring change • Increased contamination risk • Greater material selection • Easier customization • Limited Temp ( ~100C ) • Disposables • More compact footprint • Cleaner • no o-rings/seals • no handling of element • Easier for prewetting • Improved safety • Higher Temps ( 180C )

  28. Membrane Contaminant Fluid Conditions Variables Which Effect Retention Structure - cast - stretched - irradiated Charge Pore size & pore size distribution. Porosity* Thickness Etc. REF.<C01> Type: - solvent - acid - base - mixture Viscosity* Flow rate/face velocity Temperature Pressure: - pulse - differential

  29. Five major filtration mechanism 1.Cake filtration 2.Size exclusion 3.interception 4.adhesion 5.adsorption • Two major filter types Depth filter—Pre filter-dirty process Membrane filter – Final filter-precision filtration • Filter Wetability Hydrophobic membrane – used for solvent Hydrophilic membrane –Not need to prewet for water basechemical • Filter Retention Defined by pore size and LRV Affected by Pore size distribution and pore size definition Summary

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