The Membralox® ceramic membrane is an asymmetric membrane composed of a porous support and a filtering layer.
The support is the most porous part of the membrane. It is produced by sintering high purity alumina particles, which creates a highly permeable yet very strong macroporous structure.
The active layer is composed of ceramic particles (alumina, zircona or titania depending of the type of layer) with a perfectly defined size to create a filtering layer with a well defined pore size. It lines the inside surface of the filtration channels and is in direct contact with the fluid to be treated.
Of minute thickness, this active layer is usually bedded on an intermediate layer by high temperature sintering to produce an exceptionally robust structure. It lends the asymmetric membrane its selectivity and separation efficiency.
The liquid being filtered flows within each of the channels according to the principles of crossflow filtration and the filtrate passes through the active layer and then through the porous support between the channels before reaching the outside lateral surface, as shown in Figure 2.
As the Membralox® support material is exceptionally permeable, the pressure drop caused by the filtrate passing through the support can generally be considered negligible compared to the pressure drop of the filtrate passing through the active layer.
The liquid being filtered flows within each of the channels according to the principles of crossflow filtration and the filtrate passes through the active layer and then through the porous support between the channels before reaching the outside lateral surface, as shown in Figure 2.
As the Membralox® support material is exceptionally permeable, the pressure drop caused by the filtrate passing through the support can generally be considered negligible compared to the pressure drop of the filtrate passing through the active layer.
In the Membralox® line of ceramic membrane products, the high purity ceramic material of the support and the microfiltration active layer is alumina (> 99.97%). Active layers in the ultrafiltration pore size range are made of zirconia or titania respectively. All these materials are extremely resistant to a wide range of pH values, temperatures, pressures and chemicals. Nevertheless, some chemicals, e.g. phosphoric or hydrofluoric acids could react with ceramic membranes. In case of doubt, please contact our Scientific and Laboratory Services.
Special modifications obtained by coating each of the ceramic particles of the membrane structure can be offered. These modifications change the surface characteristics of the membrane, and may improve performance in specific applications. For example, the B modification provides increased resistance to phosphoric acid. Table 1 summarises the Membralox® range of ceramic membrane pore sizes.
Note: in the early 1980s , Membralox® ultrafiltration membranes with active layer made of gamma alumina were also available, but since this form of alumina has limited chemical resistance and lower permeability, it is now only available for some specific applications.作者: fsdd817 时间: 2013-4-25 16:49
Characteristics of Membralox ceramic membranes
Description:
Membralox® ceramic membranes are available in various flow channel diameters, cross-sectional shapes and different end-sealing. They range from a simple tube (single distribution channel) often used for feasibility testing to an element with several channels forming a robust monolithic configuration.
Membralox® membranes have a hexagonal cross-section.
An alternate line of Membralox® products named "round shoulder", is hexagonal in cross-section, but the ends where the element seals into the filter housing are rounded to accommodate a special moulded gasket while the original hexagonal-end ceramics uses a machined one.
Standard Membralox® membranes are 1020 mm long, although the old range of 850 mm membranes is available on request.
Membralox® multi-channel membranes are available with flow channel diameters of 3, 4 or 6 mm, to match the specific needs of the target application (e.g. high/low viscosity, concentration of suspended matter, etc.)
The standard single tube for feasibility testing is 250 mm long and has a channel diameter of 7 mm.作者: fsdd817 时间: 2013-4-25 16:52
Membralox ceramic membrane applications in biopharm
Description:
Biopharmaceuticals
ü Biomass recycling
ü Clarification of fermentation broth for the production of antibiotics, enzymes, vitamins
ü Purification of vitamin, enzyme solutions
ü Production of pharmaceutical grade water
ü Perfume decolorization
ü Separation in the liposome production process
ü Effluent treatment作者: fsdd817 时间: 2013-4-25 16:53
Membralox ceramic membrane applications
Description:
Biopharmaceuticals
ü Biomass recycling
ü Clarification of fermentation broth for the production of antibiotics, enzymes, vitamins
ü Purification of vitamin, enzyme solutions
ü Production of pharmaceutical grade water
ü Perfume decolorization
ü Separation in the liposome production process
ü Effluent treatment
Chemicals
ü Pigment, hydroxide and catalyst recovery
ü Latex concentration
ü Solvent recovery
ü Oil/water separation
ü Reverse osmosis pretreatment
ü Refinery effluent treatment
ü Hydrochloric acid clarification
ü Effluent treatment
Electronics
ü Particle removal from ultrapure gases
ü Ultrapure water polishing
ü CMP process sludge recovery
ü TMAH solutions recovery / clean up
ü Dicing saw cooling water clean up
ü Wafers
Food & Beverage
u Sugars, sweeteners and derivatives
ü Saccharification liquor clarification
ü Clarification of fermentation broths in the production of aminoacids, organic acids, polyols
ü Clarification in sugar cane refining
u Drinking milk and cheese production
ü Bacteria removal for extended shelf life (ESL) milk
ü Bacteria removal from milk for cheese processing and baby food
ü Concentration of fresh cheese
ü Milk protein concentration
ü Milk casein standardization
ü Bacteria removal in whey processing
ü Whey defatting
ü Whey protein isolates (WPI) concentration作者: fsdd817 时间: 2013-4-25 16:58
u Beverages
ü Beer recovery from yeast
ü Clarification of spirits, ciders, fruit juices
ü Bacteria and/or iron removal, drinking water production
u Food ingredients and additives
ü Clarification and/or concentration of gelatin, arabic gum
ü Bacteria removal
ü Protein concentration and fractionation
ü By-product protein recovery
ü Tank bottom recovery
ü Used cooking oil recovery
ü Fractionation, dewaxing and fat retention
ü Clarification of vinegar
u Waste streams
Miscellaneous
u Pulp and paper - printing
ü Pigment and ink recovery
ü Dewaxing
ü Effluent treatment
u Textiles
ü Printing dye and pigment recovery
ü Effluent treatment
u Nuclear industry
ü Radioactive mud concentration
ü Washing wastewater decontamination
ü Effluent treatment
u Mechanicals and metal treatment
ü Degreasing baths recovery (oil/water separation)
ü Cutting fluid recovery
ü Clarification of precision part rinse water
ü Vehicle wash-water recycling
ü Bilge water treatment
ü Effluent treatment (oil/water separation, COD reduction)
u Others
ü Oxygenation, gas diffusion
ü Cryogenic fluid sterilization
ü Solvent separation
Effluents
u Removal of suspended solids
u COD, BOD and suspended solids reduction by membrane bioreactor
u Industrial laundry wash-water recycling
u Oil/water separation
u Brine recycling
u Cleaning in place (CIP) chemicals clarification for recycling
u Solvent recovery
u Tank bottom recovery
u Effluent treatment for recycling in zero-waste plant
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