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The Concept of the Basic Liquid :. Topics The key point to the filter Filter Cartridge n Filter type n Depth fiber, Membrane, Hollow Fiber… n Filter Device.

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Presentation on theme: "The Concept of the Basic Liquid :. Topics The key point to the filter Filter Cartridge n Filter type n Depth fiber, Membrane, Hollow Fiber… n Filter Device."— Presentation transcript:

1 The Concept of the Basic Liquid :

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

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 Membrane Characteristics "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 That is why HA

9 Typical Filtration Devices: Pleated Cartridges 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. Permeate Flow Path Inlet Flow Path

10 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 Fluid Flow Path Permeate

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

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

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

14 Shedding Shedding Shedding particle l Time

15

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

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

18

19 What is Dewetting and how can it impact a process? SC1 SC2 H 2 O 2 NH 4 F Piranha

20 QuickChange Filters are Non-Dewetting SC1 SC2 H 2 O 2 NH 4 F Piranha Non-Dewetting Technology

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

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

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

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

25 T-Line Mounting Considerations n 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 Inlet Outlet

26 T-Line Mounting Considerations n 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 Vent Drain

27 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

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

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

30 Variables Which Effect Retention MembraneContaminantFluidConditions Structure - cast - stretched - irradiated Charge Pore size & pore size distribution. Porosity* Thickness Etc. REF. Type: - solvent - acid - base - mixture Viscosity* Flow rate/face velocity Temperature Pressure: - pulse - differential

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


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