Presentation on theme: "The Concept of the Basic Liquid"— Presentation transcript:
1 The Concept of the Basic Liquid 技術研討資料Millipore Corporation has always been at the forefront of filter membrane development and characterization for the Microelectronics industry. We are focused on continuing improvements to test methods in an effort to provide solutions to our customers' contamination controls problems.Retention of particles is the most fundamental require- ment of any chemical filter. Any filter must be capable of removing the majority of particles from the liquid streamThis presentation will review our latest progress in particle retention testing of Teflon filters, as well as test results from third party studies.主講人 : 龍仁生
2 Topics The key point to the filter Filter Cartridge Filter type Depth fiber, Membrane, Hollow Fiber…Filter DeviceMembrane, Support…Membrane CharacteristicRetentionWet-ability --- De-wetFilter HousingSS, PFA, PVDF,PP…How to choice an optimal filter
3 The key to filter in Chemica The Filter pore size / RetentionHow much ? 0.1um, 0.2um…Lower filtration rate, Higher retentionThe Chemical Compatibility / Pre-wettingPTFEUPEPPNylonCleannessLow Hold Volume
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 filteri.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 filterThat is why HA
9 Typical Filtration Devices: Pleated CartridgesPermeateFlow PathInlet Flow PathFilter "pack" contains membrane, plus upstream & downstream fibrous supports.Supports can be a source of particles .Pulse pressure is a potential shedding sourceIt is not easy to prewet and flush.
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 ventingFluidFlowPathPermeate
11 Typical Filtration Devices: Hollow Fiber Cartridges Filter area can be greater than pleated structureBenefits of self-supporting, high surface area, high flow.Used mostly in water filtration and photochemical.Low pressure drop
25 T-Line Mounting Considerations Bowl Down (top of the head points toward ceiling)Easier to drain upstream side of filterAir does not get trapped in coreLiquid remains in core after drain20" can be difficult to mount filtersInletOutlet
26 T-Line Mounting Considerations Bowl Up (top of the head points towards the floor)Complete draining of filter coreEasy filter installationRecommended configuration for 20" housingsLiquid drains from upstream side of filterMust vent downstream side of housingVentDrain
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
31 Summary Two major filter types Filter Wetability Five major filtration mechanism1.Cake filtration 2.Size exclusion 3.interception 4.adhesion 5.adsorptionTwo major filter typesDepth filter—Pre filter-dirty processMembrane filter – Final filter-precision filtrationFilter WetabilityHydrophobic membrane – used for solventHydrophilic membrane –Not need to prewet for water base chemicalFilter RetentionDefined by pore size and LRVAffected by Pore size distribution and pore size definition
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