WO2005094966A1 - Milieux filtrants - Google Patents

Milieux filtrants Download PDF

Info

Publication number
WO2005094966A1
WO2005094966A1 PCT/EP2005/001774 EP2005001774W WO2005094966A1 WO 2005094966 A1 WO2005094966 A1 WO 2005094966A1 EP 2005001774 W EP2005001774 W EP 2005001774W WO 2005094966 A1 WO2005094966 A1 WO 2005094966A1
Authority
WO
WIPO (PCT)
Prior art keywords
water
filter
carbon block
filter medium
pac
Prior art date
Application number
PCT/EP2005/001774
Other languages
English (en)
Inventor
Sharadchandra Govind Bansode
Dhulipala Ravikumar
Jaideep Chatterjee
Velayudhan Nair Gopa Kumar
Original Assignee
Unilever N.V.
Unilever Plc
Hindustan Lever Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Unilever N.V., Unilever Plc, Hindustan Lever Limited filed Critical Unilever N.V.
Priority to BRPI0508689-2A priority Critical patent/BRPI0508689A/pt
Publication of WO2005094966A1 publication Critical patent/WO2005094966A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • B01D39/2055—Carbonaceous material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2101/00—Types of filters having loose filtering material
    • B01D2101/02—Carbon filters

Definitions

  • the present invention relates to a carbon block filter media for use in gravity-fed filtration units for filtering particulate contaminants including microorganisms like cysts, bacteria and viruses from a liquid, as well as for removal of chemical contaminants, while at the same time maintaining high flow rates.
  • Fluids such as liquids or gases typically contain contaminants, which include particulates, chemicals and organisms.
  • contaminants which include particulates, chemicals and organisms.
  • liquids like water, especially drinking water it is desirable to remove the harmful contaminants before consumption so as to maintain proper hygiene and safe conditions for maintenance of good health.
  • Water treatment for household use is basically directed to providing safe drinking water.
  • the methods and devices typically used in households for water treatment can be classified based on whether water is available under pressure, like the high head of water from an overhead tank, or whether water is available in small quantities, like a few litres in which case the pressure available is close to gravity. Filtration of water in the former case is classified under online systems, which have the advantage of the pressure of the water flow to drive the filtration and therefore do not usually face problems of achieving desired flow rate while catering to the basic need of effective filtration.
  • Filtration of water in the latter is classified under self- contained systems, which process water in batches under low gravity heads. It is a challenge to ensure the necessary removal of the undesirable contaminants by filtration under such low gravity head, while ensuring the desirted high flow rate .
  • filters designed for online systems are applied to gravity fed systems they fail to produce the desired flow rates consistently over time and often choke after a few litres are passed through, leading to the need for replacement or cleaning.
  • a self-contained system for domestic application has an upper and a lower chamber separated by a filter cartridge wherein the water to be treated is poured in the upper chamber and allowed to flow by gravity through the cartridge to the store in the lower chamber.
  • the treated water in the lower chamber can be dispensed for consumption as and when desired.
  • activated carbon to remove bad taste and odour from water as well as chlorine and other reactive chemicals.
  • Use of ion exchange resin for removing metal and other ions from water is also known.
  • US5505892 describes a process for manufacturing a filter unit made as a moulded absorbent element permeable to gases and liquids, comprising (i) mixing granules of absorbent medium and a granular organic thermoplastic binder medium (ii) placing in a mould and compressing it (iii) heating to a temperature of about 330 to 350 °C until partial coking of the binder medium occurs and (iv) cooling.
  • the publication describes use of carbon of the granular type i.e of granule size 2 mm to 3 mm.
  • EP 0345381 (American Cyanamid, 1989) describes a filter structure for use in the purification of a liquid comprising activated carbon particles entrapped within a porous plastic matrix wherein the size of the activated carbon particles is 5-150 ⁇ m.
  • the extremely fine carbon particles are bonded with thermoplastic bonding agents of sizes substantially greater than on average, the particle size of the activated carbon particles.
  • the activated carbon particles are uniformly distributed throughout the porous plastic matrix structure.
  • filter units comprising carbon particles of either very high granularity or very fine carbon dust and would not be suitable to meet the high demands of microparticle especially microorganism separation from water filtered under low gravity head while consistently maintaining the desired high flow throughput .
  • US4753728 (Amway 1988) describes a carbon particle filter comprising carbon particles bonded into a filter block by a low melt index polymeric material having a melt index of less than 1 gram per 10 minutes as determined by ASTM D1238 at 190 degree C, and 15 kilograms load, whereby said polymeric material will tackify at elevated temperatures without becoming sufficiently liquid to substantially wet the carbon particles.
  • the present invention provides carbon block filter media comprising powdered activated carbon of a selected particle size distribution and binder material having selected melt flow characteristics and specified particle size distribution.
  • the filter media have been engineered to have desired particle size distribution profile across height of the bed.
  • the inventors have also developed improved process for preparing the above filter media.
  • the filter media provide for effective filtering leading to up to 99.9% removal of even chlorine resistant cysts such as cryptosporidium parvum and Giardia Lamblia which are in the size range of 3 to 6 ⁇ m and other microorganisms like bacteria which have size in the range of 1 to 0.1 ⁇ m with a removal efficiency of more than 99.99% and even smaller organisms like virus up to 99% removal, without affecting flow rate.
  • the filter media provide removal of chemicals including pesticides and removal of bad odour. It is another object of the invention to provide a process for preparing the filter media outlined above.
  • the invention provides carbon block filter media for use in gravity fed filters comprising: (a) powder activated carbon (PAC) having a particle size distribution such that 95 wt% of the particles pass through 50 mesh and not more than 13% passes through 200 mesh and (b) a binder material having a Melt Flow Rate (MFR) of less than 5g / lOmin.
  • PAC powder activated carbon
  • MFR Melt Flow Rate
  • 95% of the PAC particles also passes through 60 mesh. Also preferably not more than 12% passes through 200 mesh. Across their height the particle size distribution in the carbon block filter media is preferably not uniform and it is preferred that 55 to 80 wt % of the PAC particles in the particle size range of 100 to 200 mesh is localised in the lower 50 volume% of the carbon block filter media.
  • the carbon block filter media have 55 to 95 wt% of the PAC particles in the size range smaller than 200 mesh localised in the lower 50 vol% of the carbon block filter media
  • the invention provides water filters for use in gravity fed water filtration equipment comprising: (a) a washable or replaceable sediment filter for removing fine dust and other particulates above 3 ⁇ m, (b) a carbon block filter medium comprising the PAC and the binder material as herein described;
  • the cover or housing is preferably detachable.
  • the invention provides a process for the preparation of a carbon block filter medium comprising the steps of (a) intimately mixing powder activated carbon (PAC) having a particle size distribution such that 95 wt% of the particles pass through 50 mesh and not more than 13% passes through 200 mesh with binder material having a Melt Flow Rate (MFR) of less than 5 in a mixer (b) compacting the mix in a vibratory compactor (c) further compacting the mix in a mould of desired shape and size by applying a pressure of not more 20 kg/cm 2 (d) heating the mould to a selected temperature (e) cooling the mould and releasing the carbon block from the mould.
  • PAC powder activated carbon
  • MFR Melt Flow Rate
  • the PAC is preferably prepared form carbon sources selected from bituminous coal, coconut shell, wood, or petroleum tar.
  • the surface area of the PAC is preferably above 500 m 2 /9 more preferably exceeds 1000 m 2 /g.
  • the particle size of the PAC is selected such that 95 wt% of the particles pass through 50 mesh, preferably 60 mesh, and on the other hand not more than 13%, preferably not more than 12%, more preferably not more than 10% passes through 200 mesh.
  • the PAC has a size uniformity co-efficient of less than 2, or more preferably less than 1.5, a carbon tetrachloride number exceeding 50%, more preferably exceeding 60%.
  • the PAC preferably has an Iodine number greater than 800, more preferably greater than 1000.
  • the carbon block filter media preferably have a particle size distribution profile across their height. It is preferred that the PAC particles are distributed across the height of the carbon block such that 55 to 80 wt%, preferably 55 to 70 wt% of the PAC particles in the particle size range of 100 to 200 mesh are present in the lower 50 volume% of the carbon block filter media.
  • the PAC particles are distributed across the height of the carbon block such that 55 to 95%, more preferably 60 to 95% of the PAC particles in the particle size range smaller than 200 mesh are present in the lower 50 vol% of the carbon block filter media.
  • the bulk density of the binder material used in the invention is preferably not more than 2.5 g/cm 3 , more preferably ⁇ 0.6 g/cm 3 , even more preferably ⁇ 0.5 g/cm 3 , most preferably ⁇ 0.25 g/cm 3 .
  • the binder material is selected to have a melt flow rate (MFR) of less than 5 gram/ 10 minutes, preferably less than 2 gram/ 10 minutes, more preferably less then lg/ lOmin.
  • MFR melt flow rate
  • the binder material preferably has a particle size distribution similar to that of the the PAC but the amount of particles passing 200 mesh is preferably less than 40 wt%, more preferably less than 30 wt%.
  • the particle size distribution of the binder is substantially the same as that of the PAC.
  • the melt -flow rate (MFR) is measured using the ASTM D 1238 (ISO 1133) test.
  • the test measures the flow of a molten polymer through an extrusion plastometer under specific temperature and load conditions.
  • the extrusion plastometer consists of a vertical cylinder with a small die of 2 mm at the bottom and a removable piston at the top. A charge of material is placed in the cylinder and preheated for several minutes. The piston is placed on top of the molten polymer and its weight forces the polymer through the die and on to a collecting plate.
  • the time interval for the test ranges from 15 seconds to 15 minutes in order to accommodate the different viscosities of plastics.
  • Temperatures used are 190, 220, 250 and 300 °C (428, 482 and 572°F).
  • Loads used are 1.2, 5, 10 and 15 kg. For the present invention the tests are done at 190 °C at 15 kg load.
  • melt flow rate is expressed in grams per reference time.
  • the binder material is preferably a thermoplastic polymer having a MFR value above described. Suitable examples include ultra high molecular weight polymer preferably polyethylene or polypropylene which have these low MFR values. The molecular weight is preferably in the range of 10 6 to 10 9 . Binders of this class are commercially available under the trade names HOSTALEN (from Tycona GmbH) , GUR, Sunfine (from Asahi) , Hizex (from Mitsubishi) 5 and from Brasken Corp (Brazil) . Other suitable binders include LDPE sold as Lupolen (from Basel Polyolefins) and LLDPE from Qunos (Australia) .
  • the proportion of the binder material to the PAC particles 10 by weight is preferably chosen between 1:1 and 1:10, more preferably between 1: 2 and 1:6.
  • the above disclosed carbon block filter media of the invention are able remove chemical contaminants and more 15 importantly at least 99.9% of cysts such as Giardia La blia, Cryptospordirium Parvu and Entamoeba Histolica, 99.99% of bacteria and 99% of viruses without considerably affecting the flow rate.
  • the filter media of the present invention do not require washing and reverse flow flushing at regular intervals to ensure high flow rates.
  • reverse flushing can be done under tap water or by reversing the carbon block within the gravity
  • the water filters according to the invention comprise a carbon block filter medium of the invention.
  • the water filters also comprise a sediment filter which may be washable or replaceable and is preferably a woven or non- woven fabric, more preferably a non-woven fabric having micropores. This sediment filter is used as a prefilter and has a pore size suitable to retain particles generally above 3 ⁇ m.
  • the sediment filter can be washed and rinsed under flowing tap water or by using a small amount (0.1-10 g/L) of fabric wash detergent in water. This use of the sediment filter facilitates wide and extensive application of the carbon block filter media of the invention by preventing the filter media from becoming choked with sedimen ..
  • the carbon block filter medium is attached to a base plate with an orifice for the water exit and additionally comprises a detachable cover.
  • the base plate is preferably made of plastic such as polypropylene, polyethylene, ABS, SAN.
  • the detachable cover is preferably also made of: polypropylene, polyethylene, ABS, SAN.
  • the filter medium can be of any desired shape and size. Suitable shapes include flat circular disc of low thickness, square disc of low thickness, low height tapered flat disc, cylinder, solid cone, hollow cone, solid or hollow hemisphere, etc.
  • a bed of granular adsorbent particles in said water filter, such that the water to be filtered passes through said bed of granular adsorbent particles before passing through the carbon block filter medium.
  • the granular adsorbent particles are preferably granular activated carbon.
  • the granular adsorbent particles preferably have a particle size in the range of 200 to 5000 ⁇ m, more preferably 200 to 2000 ⁇ m, most preferably 500 to 1500 ⁇ m.
  • a water filter for use in gravity fed applications comprising: (a) a washable or replaceable sediment filter for removing fine dust and other particulates above 3 ⁇ m; (b) a bed of granular adsorbent particles (c) a carbon block filter medium comprising the PAC and the binder material as herein described (d) a base plate with an orifice for water exit, to which the carbon block is attached; (e) a cover or housing to hold the entire filter as one integral unit.
  • the bed of granular absorbent particles is provided so as to enable quick and easy replacement of the particles, either by providing them in a separate housing which may be removed, and if desired emptied and filled with a new charge of particles, and refitted again, or in a housing attached to the sediment filter to be removed and replaced with the sediment filter, or combined in one housing with the carbon block folter medium.
  • the inclusion of the granular adsorbent particles in the water filter enables filtration of a significantly higher amount of input water over an extended time period thereby ensuring more efficient utilization of the carbon block filter media of the invention. Additionally, the granular adsorbent particles in the water filter enables effective filtration of highly contaminated water containing high amounts of fine particles like dust and dissolved impurities like iron and aluminium salts.
  • the invention also provides a process for the preparation of carbon block filter media comprising the steps of intimately mixing PAC with binder material in a mixer, compacting the mixture in a vibratory compactor, further compacting the mix in a mould, heating the mould, cooling the mould and releasing the carbon block from the mould.
  • any low shear mixer that does not significantly alter the particle size distribution is suitable, such as a mixer with dulled impeller blades, ribbon blender, rotary mixer.
  • the mixing is carried out to prepare a uniform mix of the PAC and the binder material and is preferably carried out for at least 15 minutes, more preferably 20 to 60 minutes.
  • the compaction of the mix is carried out in a vibratory compactor to obtain the desired particle size distribution profile across the height of the carbon block.
  • the vibratory compaction is preferably carried out in a vibrator having a frequency in the range of 30 to 100 Hz. This process step is preferably carried out for a period of at least one minute, more preferably for 3 to 30 minutes.
  • the compacted mass is then placed in a mould of preselected size and shape and subjected to a pressure of not more than 20 kg/cm 2 , preferably not more than 10 kg/cm 2 .
  • the pressure is preferably applied using either a hydraulic press or a pneumatic press, more preferably a hydraulic press .
  • the mould is made from aluminum, cast iron, steel or any suitable material capable of withstanding temperatures exceeding 400 °C.
  • a mould release agent is preferably coated on the inside surface of the mould.
  • the mould release agent is preferably selected from either silicone oil, aluminum foil or any other commercially available mould release agent that has little or no adsorption onto activated carbon or the binder material .
  • the mould is then heated to a temperature of 150 to 400 °C, preferably in the range of 180 to 320 °C, depending on the binder material that is used.
  • the mould is kept heated for a period to time of more than 60 minutes, preferably between 90 and 300 minutes depending on the size and the shape of the mold, and sufficient to ensure uniform heating of the contents of the mould.
  • the mould is preferably heated in an oven such as a non-convection, forced air or forced inert-gas convection oven.
  • the mould is then cooled and the carbon block released from the mould.
  • the invention provides a process for the purification of water whereby the water under the influence of gravity is passed first through a washable or replaceable sediment filter for removing fine dust and other particulates above 3 ⁇ m and thereafter through a carbon block filter medium comprising PAC and binder material as herein above described.
  • a washable or replaceable sediment filter for removing fine dust and other particulates above 3 ⁇ m and thereafter through a carbon block filter medium comprising PAC and binder material as herein above described.
  • the water is also passed through a a bed of granular adsorbent particles as herein above described between passing through the sediment filter and the carbon block filter medium.
  • the starting pressure before entering the sediment filter is preferably not more that 3000 mm water column, more preferably at most 1000mm water column, most preferably does not exceed 500mm water column.
  • a carbon block was prepared by taking 100 gram PAC from Active Carbon (India) and 30 gram of ultra high molecular weight polyethylene with MFR - 0 and bulk density of 0.22 g/cm 3 from Asahi (Japan) .
  • the PAC had 6.5 wt% of the particles passing 200 mesh and 98% of the particles passing through 50 mesh.
  • the powders were mixed in a ribbon mixer for 30 minutes and transferred to a mould.
  • the mould was then vibrated on a vibrator for 5 minutes and then subjected to a hydraulic pressure of 10 kg/cm 2 .
  • the mould was then heated to 260 °C for 150 minutes and then cooled.
  • Comparative Example A A carbon block as per Example 1 was prepared except that the binder used was HDPE from Sri Lanka having an MFR of 25. The above two sample carbon blocks were subjected to filtration of water under a gravity head of 75 mm. The filtration characteristics and flow rate over time is summarized in Table-1. The removal efficiency of the microorganisms is measured using the test procedure summarized below Table-1.
  • Example-1 The data in Table-1 indicate that the carbon block filter media according to the invention (Example-1) provides for very high microorganism removal efficiency while providing for consistently high flow rate under gravity head conditions .
  • Feed Water 1.23 x 10 5 Microspheres per liter of BIS/Plain water. (See Preparation section) , filter housing chamber, vacuum Pump, filter assembly, 0.45 ⁇ Millipore filter discs (47 mm), Tween 80, Glassware: Conical flasks (250 ml), Measuring Cylinders (100 ml) , pipette (1 ml) , fluorescent microscope . 5 Preparation:
  • a concentrated fluorescent polymer microsphere suspension (Catalog no. G0300, reportedly having 7.4 x 10 8 10 microspheres/ml with each microsphere having 3 micron mean diameter, 0.1 micron standard deviation, from Duke Scientific, Palo Alto, CA 94303, USA) was used. lO ⁇ l of the above solution + lO ⁇ l Tween 80 + 9.98 ml of 15 distilled water were taken. The stock preparation was vortexed for 10 min to ensure uniform distribution of the microspheres. Tween 80 was used as dispersant . (as per ANSI/NSF 53-2001 protocol) .
  • Feed water was prepared by adding 1 ml of the stock solution to 6 liters of plain water. This resulted in a microsphere concentration of 1.23 x 10 5 particles/L.
  • Each filtered disc was allowed to air dry for at least 5 hours under ambient conditions.
  • Microspheres were then counted on each filtered disc at 40X magnification using a Fluorescent Microscope, (as per EPA-ICR method 814-B-95-003 chapter 6) as follows:
  • the model organism chosen for the test was E. Coli.
  • RO water dechlorinated municipal water, AR grade CaCl 2 , MgCl 2 , CaS0 4 , MgS0 4 , NaHC0 3 , Na 2 C0 3 , NaOH, freshly prepared sodium hypochlorite (1% solution with 10000 ppm average chlorine) , bottles, pipettes, pH, TDS, conductivity, and Turbidity meters.
  • test organisms were washed and suspended in tryptone/phosphate buffered saline before addition to the test water.
  • the culture is to be passed once every 24 hours in TSB for two successive days and incubated at 37 °C.
  • the resultant suspension is to be centrifuges for 10 minutes at 3000 rpm.
  • the supernatant is discarded and the cells washed three times with sterile tryptone or PBS and suspended in PBS.
  • the final concentration for immediate use ( - 5 x 106 cfu/100 ml in the challenge water) is to be determined spectrophotometrically
  • MS2 culture Host strain used is E Coli ATCC 15597.
  • the host strain medium is prepared using tryptone (10 g) yeast extract (8 g) , NaCl (8 g) , distilled water (1 liter) and agar (15 g) .
  • the sample is filtered, sterilised and added aseptically to the sterile medium.
  • the growth conditions are maintained at 37 °C and in aerobic and stationary conditions .
  • Procedure for MS2 quantification 1. Prepare an actively growing ATCC broth culture of the MS2 host by innoculating it into 25 ml of the medium under static and aerobic conditions for 24 hours at 37 °C. 2. Pour the basal agar plates with Escherichia medium agar and maintain at 37 °C.
  • Water filter-1 as depicted in Figure-1 was prepared.
  • the water filter as per figure- 1 comprises a sediment filter (SF) , a carbon block filter medium (CB) prepared as per Example 1 which is adhered to a base plate (BP) .
  • SF sediment filter
  • CB carbon block filter medium
  • Water filter-2 as depicted in Figure-2 was prepared.
  • the water filter as per figure-2 comprises a sediment filter (SF) , a carbon block filter medium (CB) prepared as per Example 1 which is adhered to a base plate (BP) .
  • the space between the carbon block filter media and the sediment filter is filled with granular activated carbon (GAP) with a particle size in the range of 500 to 1500 ⁇ m.
  • GAP granular activated carbon
  • test water having 15 mg/1 of fine Arizona test dust and additionally 0.47 ppm of dissolved aluminium cations and 0.4 ppm of dissolved iron cations was prepared. This test water was filtered through the water filters of Figure- 1 (Example 2) and Figure-2 (Example 3) with a constant head of 160mm. The flow rates obtained over extended period of use of the filters are summarized in Table-3. Acceptable quality of filtered water was obtained with both filters.
  • the data in table-3 indicates the high output flow rates of filtered water obtained with the use of the water filter comprising the carbon block filter media according to the invention (figure-1) . Increased flow rate of water was obtained with the use of the water filter according to the preferred aspect of the invention comprising granular adsorbent particles and the carbon block ( Figure-2)
  • Fines in the above table is the fraction having particle size smaller than 200 mesh.
  • the percentage of the fines passing 200 mesh which was in the bottom 50 vol% of the carbon block was in the range of 55 to 95 wt% of the total of fines passing 200 mesh. All these samples were found to provide good carbon blocks as per the invention.
  • the invention thus provides carbon block filter media, a process for preparing the same, water filters which can be prepared using such carbon blocks and a process for purifying water using the carbon blocks.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Materials (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Water Treatment By Sorption (AREA)

Abstract

Cette invention concerne des milieux filtrants à charbon actif utilisables dans des filtres alimentés par gravité qui comprennent du carbone activé par la poudre (PAC) présentant une granulométrie telle que 95 % en poids des particules passent au travers de 50 mailles et au plus 13 % passent au travers de 200 mailles; et un liant présentant un taux de fluage (MFR) inférieur à 5g/10 min. L'invention concerne également des filtres à eau et une méthode de préparation d'un milieu filtrant à charbon actif. L'invention concerne enfin une méthode d'épuration d'eau dans laquelle l'eau soumise à la gravité est passée d'abord au travers d'un filtre à sédiments remplaçable pouvant éliminer la poussière fine et d'autres particules de plus de 3 µm, puis au travers d'un milieu filtrant à charbon actif comprenant le PAC et un liant.
PCT/EP2005/001774 2004-03-16 2005-02-17 Milieux filtrants WO2005094966A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
BRPI0508689-2A BRPI0508689A (pt) 2004-03-16 2005-02-17 meio de filtro de bloco de carbono para uso em filtros alimentados por gravidade, filtro de água para uso em um equipamento de filtração de água alimentada por gravidade, e, processo para a preparação de um meio de filtro de bloco de carbono e para a purificação de água

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
IN320MU2004 2004-03-16
IN320/MUM/2004 2004-03-16
EP04077185.9 2004-07-29
EP04077185 2004-07-29
IN1300/MUM/2004 2004-12-07
IN1300MU2004 2004-12-07

Publications (1)

Publication Number Publication Date
WO2005094966A1 true WO2005094966A1 (fr) 2005-10-13

Family

ID=34964127

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/001774 WO2005094966A1 (fr) 2004-03-16 2005-02-17 Milieux filtrants

Country Status (3)

Country Link
BR (1) BRPI0508689A (fr)
PL (1) PL380664A1 (fr)
WO (1) WO2005094966A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007003259A1 (fr) * 2005-07-06 2007-01-11 Unilever N.V. Cartouche filtrante
WO2007054196A1 (fr) * 2005-11-08 2007-05-18 Unilever N.V. Procede de regeneration de filtres au bloc de carbone
WO2007059832A1 (fr) * 2005-11-22 2007-05-31 Unilever N.V. Cartouche filtrante pour épuration des eaux
EP1870150A1 (fr) * 2006-06-23 2007-12-26 Unilever N.V. Filtre et son procédé de fabrication
WO2010020513A1 (fr) * 2008-08-22 2010-02-25 Unilever Nv Filtre à particules
US7673757B2 (en) 2006-02-17 2010-03-09 Millipore Corporation Adsorbent filter media for removal of biological contaminants in process liquids
USD647595S1 (en) 2007-09-20 2011-10-25 Omnipure Filter Company, Inc. Filter block for liquid filtration
US8167141B2 (en) 2004-06-30 2012-05-01 Brita Lp Gravity flow filter
WO2012059299A1 (fr) 2010-11-01 2012-05-10 Unilever Nv Procédé de fabrication d'un bloc de filtration comportant un filtre à sédiments
CN102186552B (zh) * 2008-10-17 2015-05-06 荷兰联合利华有限公司 碳块过滤器
WO2016177552A1 (fr) 2015-05-06 2016-11-10 Unilever N.V. Recyclage en continu de l'eau de lavage avec un dispositif de floculation et procédé

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4753728A (en) * 1986-04-07 1988-06-28 Amway Corporation Water filter
US5817263A (en) * 1996-08-30 1998-10-06 Amway Corporation End flow filter and method of making same
EP1023931A1 (fr) * 1999-01-28 2000-08-02 Beth-El Zikhron-Yaaqov Dispositifs et cartouches pour filtrer des fluides et des gaz
US6368504B1 (en) * 2000-11-06 2002-04-09 Alticor Inc. Carbon block water filter
GB2390987A (en) * 2002-12-17 2004-01-28 Unilever Plc A carbon containing filtration medium

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4753728A (en) * 1986-04-07 1988-06-28 Amway Corporation Water filter
US5817263A (en) * 1996-08-30 1998-10-06 Amway Corporation End flow filter and method of making same
EP1023931A1 (fr) * 1999-01-28 2000-08-02 Beth-El Zikhron-Yaaqov Dispositifs et cartouches pour filtrer des fluides et des gaz
US6368504B1 (en) * 2000-11-06 2002-04-09 Alticor Inc. Carbon block water filter
GB2390987A (en) * 2002-12-17 2004-01-28 Unilever Plc A carbon containing filtration medium

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8167141B2 (en) 2004-06-30 2012-05-01 Brita Lp Gravity flow filter
WO2007003259A1 (fr) * 2005-07-06 2007-01-11 Unilever N.V. Cartouche filtrante
WO2007054196A1 (fr) * 2005-11-08 2007-05-18 Unilever N.V. Procede de regeneration de filtres au bloc de carbone
WO2007059832A1 (fr) * 2005-11-22 2007-05-31 Unilever N.V. Cartouche filtrante pour épuration des eaux
US8672144B2 (en) 2006-02-17 2014-03-18 Emd Millipore Corporation Adsorbent filter media for removal of biological contaminants in process liquids
US8562875B2 (en) 2006-02-17 2013-10-22 Emd Millipore Corporation Adsorbent filter media for removal of biological contaminants in process liquids
US7673757B2 (en) 2006-02-17 2010-03-09 Millipore Corporation Adsorbent filter media for removal of biological contaminants in process liquids
US8403153B2 (en) 2006-02-17 2013-03-26 Emd Millipore Corporation Adsorbent filter media for removal of biological contaminants in process liquids
WO2007147716A1 (fr) * 2006-06-23 2007-12-27 Unilever N.V. Filtre et procédé de préparation de celui-ci
EP1870150A1 (fr) * 2006-06-23 2007-12-26 Unilever N.V. Filtre et son procédé de fabrication
USD647595S1 (en) 2007-09-20 2011-10-25 Omnipure Filter Company, Inc. Filter block for liquid filtration
EA017592B1 (ru) * 2008-08-22 2013-01-30 Юнилевер Н.В. Фильтр тонкой очистки
EP2161067A1 (fr) 2008-08-22 2010-03-10 Unilever N.V. Filtre à particules
WO2010020513A1 (fr) * 2008-08-22 2010-02-25 Unilever Nv Filtre à particules
CN102186552B (zh) * 2008-10-17 2015-05-06 荷兰联合利华有限公司 碳块过滤器
US9339747B2 (en) 2008-10-17 2016-05-17 Conopco, Inc. Carbon block filter
WO2012059299A1 (fr) 2010-11-01 2012-05-10 Unilever Nv Procédé de fabrication d'un bloc de filtration comportant un filtre à sédiments
WO2016177552A1 (fr) 2015-05-06 2016-11-10 Unilever N.V. Recyclage en continu de l'eau de lavage avec un dispositif de floculation et procédé

Also Published As

Publication number Publication date
PL380664A1 (pl) 2007-03-05
BRPI0508689A (pt) 2007-09-11

Similar Documents

Publication Publication Date Title
WO2005094966A1 (fr) Milieux filtrants
EP2161067B1 (fr) Filtre à particules
US6852224B2 (en) Carbon fiber filters
WO2007003383A1 (fr) Filtre et procede de filtrage de liquides
RU2437706C2 (ru) Фильтр и способ его изготовления
US20080093303A1 (en) Method for removal of nano-sized pathogens from liquids
EP2914550B1 (fr) Milieu filtrant contenant des fibres
JP2006513846A (ja) 水フィルタ材料の製造方法及び水フィルタ
GB2390987A (en) A carbon containing filtration medium
EP2616172B1 (fr) Milieu filtrant à bloc d'alumine
CN1933890A (zh) 过滤介质
EP1109611B1 (fr) Filtres en fibres de carbone
MXPA06010494A (en) Filter media
WO2006037420A1 (fr) Dispositif de purification d'eau
EP2226108A1 (fr) filtre
WO2007003259A1 (fr) Cartouche filtrante
TWI754251B (zh) 吸附材料、重金屬去除劑、以及使用其之成形體及淨水器
WO2007039019A1 (fr) Filtre moule et processus pour sa fabrication
EP2635362B1 (fr) Procédé de fabrication d'un bloc de filtration comportant un filtre à sédiments
WO2017067773A1 (fr) Support filtrant ayant du cuivre et du zinc
MXPA01003099A (en) Activated carbon filter

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

DPEN Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed from 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
WWE Wipo information: entry into national phase

Ref document number: 200607167

Country of ref document: ZA

WWE Wipo information: entry into national phase

Ref document number: PA/a/2006/010494

Country of ref document: MX

WWE Wipo information: entry into national phase

Ref document number: 200580008455.7

Country of ref document: CN

Ref document number: 1200601518

Country of ref document: VN

NENP Non-entry into the national phase

Ref country code: DE

WWW Wipo information: withdrawn in national office

Ref document number: DE

WWE Wipo information: entry into national phase

Ref document number: 2006136371

Country of ref document: RU

122 Ep: pct application non-entry in european phase
ENP Entry into the national phase

Ref document number: PI0508689

Country of ref document: BR