WO2007138414A1 - Dispositif d'obturation automatique de filtres - Google Patents

Dispositif d'obturation automatique de filtres Download PDF

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Publication number
WO2007138414A1
WO2007138414A1 PCT/IB2007/001334 IB2007001334W WO2007138414A1 WO 2007138414 A1 WO2007138414 A1 WO 2007138414A1 IB 2007001334 W IB2007001334 W IB 2007001334W WO 2007138414 A1 WO2007138414 A1 WO 2007138414A1
Authority
WO
WIPO (PCT)
Prior art keywords
material body
filter
compartment
filter cartridge
liquid
Prior art date
Application number
PCT/IB2007/001334
Other languages
German (de)
English (en)
Inventor
Bernhard Keller
Martin Gehri
René Pellaux
Original Assignee
Preentec Ag
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 Preentec Ag filed Critical Preentec Ag
Priority to EP07734640A priority Critical patent/EP2086888A1/fr
Publication of WO2007138414A1 publication Critical patent/WO2007138414A1/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C02F1/003—Processes for the treatment of water whereby the filtration technique is of importance using household-type filters for producing potable water, e.g. pitchers, bottles, faucet mounted devices
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/002—Construction details of the apparatus
    • C02F2201/006—Cartridges

Definitions

  • the invention relates to a device for automatic closure of used, replaceable filter cartridges in filtration systems.
  • filtration systems with replaceable filter cartridges are used to e.g. Free water from organoleptically interfering impurities to reduce water hardness, kill microorganisms, or to remove toxins such as arsenic compounds from liquids.
  • the binding of the substances to be removed is achieved by a filling of the filter cartridges with filter materials such as activated carbons, ion exchangers or specific sorbents such as arsenbindenen sorbents.
  • filter materials such as activated carbons, ion exchangers or specific sorbents such as arsenbindenen sorbents.
  • the filter materials have a limited capacity for receiving the substances to be removed from the liquids and are therefore to be used only for a limited number of purification cycles.
  • the patent US 5,900,138 has been proposed to equip water filtration systems with counters.
  • This counter indicates when the maximum number of purification cycles has been reached and may optionally be equipped to mechanically block the filter when the maximum number of purification cycles is reached.
  • the main drawback of such systems is that the counter can be reset by deliberate or accidental manipulation of the user, thus allowing the filter to continue to be used, with all the risks arising therefrom.
  • a similar system has been described in US Pat. No. 4,895,648. In this case, after inserting a new filter cartridge, a marker disc on which the calendar months are noted is rotated so that the month of the filter change can be recorded.
  • the object of the present invention is thus to provide a simple and cost-effective closure system without the aforementioned disadvantages.
  • the present invention relates to a device for automatic closure of used, replaceable filter cartridges in filtration systems according to claim 1.
  • Preferred embodiments are defined in the dependent claims 2 to 8.
  • An inventive device for the automatic closure of spent filter cartridges in filtration systems in the sense of the invention described herein consists of one or more bodies of material, which are filled into a compartment inside or outside the filter cartridge.
  • the compartment is suitable for liquids such as e.g. Water permeable, but impermeable to the material body. Upon contact with water, the material bodies swell or swell and increasingly fill the compartment. As a result, the flow of liquids is reduced and finally completely prevented. It is obvious to the person skilled in the art that the circumstances described here apply to liquids in general, ie in particular also to water and aqueous systems such as solutions and mixtures.
  • Material bodies in the sense of the present invention are characterized by their shape, their material composition and their swelling and / or swelling behavior.
  • the shape of the body of material may be varied, but should be such that the body of material can not escape from the compartment. Furthermore, the size of the material body should be smaller than the passages in the compartment. It should also be noted that the shape and size of the material body influences the dynamics of the swelling behavior of the material body after contact with liquids, since material bodies having a large surface swell faster than those having a small surface area.
  • Preferred embodiments of the material body in the context of the invention are discs, balls and other regular body but also irregularly shaped body such as granules. Further preferred are discs with a diameter of 0.1-5 cm and a thickness of 0.1 - 2 cm or balls with a diameter of 0.1 - 2 cm and granules with a grain of 0.2 - learn.
  • the material composition of the material body according to the invention comprises all materials which swell on contact with water and thereby change their shape only so far that they can not escape from the compartment.
  • Preferred materials are polymeric materials. Further preferred polymers are crosslinked hydrophilic polymers. Further preferred materials are polymers which are referred to in the specialist literature as superabsorptive polymers (SAPs).
  • SAPs are cross-linked polymers based on polyacrylamides, polyacrylic acids, starch-polyacrylic acid graft polymers, polyethylene maleic anhydride copolymers
  • the swelling behavior of the material bodies is characterized by the rate of swelling and by the amount of water absorbed at equilibrium. These parameters are influenced by the shape and material composition of the material body. The temperature of the liquid, the pH value, the water hardness and the presence of other impurities can also influence the swelling behavior. In addition, the swelling behavior can be changed by modifying substances. Modifying substances in the context of the invention are all chemical substances or substance mixtures which influence the rate of swelling of the material bodies and / or the amount of liquid absorbed by the material body in the state of equilibrium.
  • Preferred modifying substances in the context of the invention are salts and polyelectrolytes. Preferred salts are the salts of polyvalent metal ions.
  • Further preferred salts of polyvalent metal ions are the salts of alkaline earth metals, in particular the salts of divalent magnesium and calcium ions.
  • the modifying substances are retained by absorption in the bodies of material.
  • a preferred swelling behavior in the context of the invention is characterized in that the amount of liquid absorbed in the equilibrium state exceeds the dry mass of the material body by a factor of 2-1000.
  • a preferred threshold speed in the sense of the invention is defined by the period of time after which the material body fills the compartment so far through the contact with the liquid flowing through the filter that the liquid flow is stopped. From this period of time, the maximum amount of liquid flowing through the filter can be calculated at a known average flow rate. This allows adaptation of the maximum flow rate to the capacity of the filter material.
  • Preferred periods of time within the meaning of the invention are in the range of 100 to 2000 minutes, further preferred time periods of 300 to 800 minutes. Since superabsorbent polymers often swell significantly faster, the use of modifying substances is necessary to achieve such long periods of time. Modifying substances such as magnesium and calcium ions which are absorbed on the material bodies can significantly slow down the rate of swelling. However, if the material bodies are in contact with liquid for longer periods of time, the modifying substances are continuously removed by diffusion from the material bodies and the swelling speed increases. In addition to the modifying substances, it is often necessary to use material bodies with a relatively low surface area to volume ratio to achieve the desired time periods. The modifying substances can additionally achieve a memory effect.
  • This memory effect is characterized in that the material bodies which have been treated with modifying substances, when in contact with liquid slowly release the modifying substances to the liquid. Now, if the contact of the material body is interrupted with the liquid, the material body begins to dry out. If the completely or partially dried material body is now contacted again with liquid, they swell quickly to the state before drying, that is, the material body treated with modifying substances remembered the state before drying.
  • a compartment in the sense of the present invention is a space segment within the filter cartridge ( Figure 1), which has a defined volume and is characterized in that it is permeable to liquids, during which the material bodies are enclosed in the compartment.
  • the compartment is mounted in the filter cartridge in a way that all liquid to be filtered must flow through the compartment.
  • the compartment consists of a space segment whose upper and lower boundary consists of a slot or screen plate whose openings are smaller than the material body, and whose lateral boundary forms the filter cartridge.
  • the volume of the compartment depends on the amount and swelling behavior of the material bodies, and can be varied over a wide range to achieve a desired time to closure of the filter.
  • the compartment is identical to the outer boundaries of the filter cartridge.
  • the compartment is located above or below or within the filter material within the filter cartridge.
  • the invention further relates to a filtration system comprising a filter cartridge and the inventive device according to claim 9 and a method for automatically closing a filter cartridge in a filtration system according to claim 1 1. Furthermore, the invention relates to the use of a swellable material body for automatic closure of a Filter cartridge in a filtration system according to claim 12.
  • Example 1 Synthesis of material bodies of acrylamide / maleic acid
  • Ig acrylamide was dissolved in ImI aqueous solutions of 0, 20, 30, 40, 50, 60mg maleic acid and treated with APS (25%) 50microl and polymerized at 50 0 C for Ih.
  • the resulting polymer was cut into pieces (5-10 mm) and rinsed thoroughly in water (demin) for 12 hours and then freed from residual monomers by Soxhlet distillation for 2 hours. Subsequently, the hydrogel particles were dried at 40 ° C in an oven to constant weight. The residual monomer content of the free acid was determined titratively with NaOH (0.05M) against phenolphthalein. If the result was positive, the washing steps including Soxhlet extraction were repeated.
  • Example 2 Synthesis of Material Structures from n-Vinylpyrrolidone / Itaconic Acid (Methylenesuccinic Acid)
  • n-vinyl-2-pyrrolidone 2 ml of n-vinyl-2-pyrrolidone was dissolved in ImI aqueous solution of 0, 60, 120, 180 and 240 mg of itaconic acid and treated with 0.25% (v / v, EGDMA / VP) of EGDMA.
  • the resulting solution was polymerized by addition of 50microl APS (25%) at 50 0 C for Ih.
  • the polymer was cut into pieces of 5-10 mm, or plates and washed extensively during 12h, it is eliminated in connection by means of Soxhlet extraction of residual monomers and in the oven at 40 0 C until constant weight.
  • the residual monomer content of the free acid was determined titratively with NaOH (0.05M) against phenolphthalein.
  • Example 3 Synthesis of material bodies of acrylamide / sodium acrylate by direct polymerization from the monomers
  • Example 5 Synthesis of material bodies of acrylamide / sodium acrylate / agar
  • Example 6 Treatment of the material bodies with modifying substances and resulting influences on the swelling behavior
  • the material bodies produced according to Examples 1-5 were modified in their Schwell behavior to have a long-term swelling behavior with a logarithmic course.
  • 5 g of the unmodified material bodies were stirred in one liter of an aqueous solution of magnesium or calcium salts of variable concentrations for 48 h. It was then filtered, washed briefly and dried in an oven at 40 0 C to constant weight. Thereafter, the dried material bodies were contacted with aqueous solutions and the swelling behavior was analyzed as a function of the material body, the temperature, the water hardness, the chlorine content.
  • Type / amount of salt used to modify 5 g of material body in 1 liter of aqueous solution (1) Type / amount of salt used to modify 5 g of material body in 1 liter of aqueous solution.
  • Example 7 Use of the modified material bodies in a water filter
  • Material MgCl 2 100 and MgCl 2 167 were added in different amounts to the filter compartment, the filter being closed at an average flow time of 5 min at a water hardness of 18 dH as follows: MgCl 2 100 750 mg 90 minutes after 18 Liters closed
  • Example 8 Swelling behavior of the material body as a function of the temperature, the water hardness and the size of the material body
  • Example 1 Influence of water hardness

Abstract

L'invention concerne un dispositif d'obturation automatique de cartouches de filtre usagées interchangeables dans des systèmes de filtrage. Le dispositif comprend un compartiment perméable aux liquides dans lequel au moins un corps de matériau gonflable est renfermé.
PCT/IB2007/001334 2006-05-24 2007-05-23 Dispositif d'obturation automatique de filtres WO2007138414A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07734640A EP2086888A1 (fr) 2006-05-24 2007-05-23 Dispositif d'obturation automatique de filtres

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH8632006 2006-05-24
CH00863/06 2006-05-24

Publications (1)

Publication Number Publication Date
WO2007138414A1 true WO2007138414A1 (fr) 2007-12-06

Family

ID=38512672

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2007/001334 WO2007138414A1 (fr) 2006-05-24 2007-05-23 Dispositif d'obturation automatique de filtres

Country Status (2)

Country Link
EP (1) EP2086888A1 (fr)
WO (1) WO2007138414A1 (fr)

Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3038610A (en) * 1959-01-30 1962-06-12 Rohm & Haas Deionization unit with automatic shutoff operable upon exhaustion of resin's ion exchange capacity
US3503507A (en) 1967-06-26 1970-03-31 Bendix Corp Shut-off valve for fuse filter
US3586018A (en) 1969-02-24 1971-06-22 Thermia Verken Ab Self-closing valve
US4302337A (en) * 1977-01-10 1981-11-24 The Dow Chemical Company Separation of oil from water
US4681677A (en) 1978-02-17 1987-07-21 Olin Corporation Water processor having automatic shutoff and bypass means
US4686037A (en) 1985-03-27 1987-08-11 Teledyne Industries, Inc. Water filter apparatus
US4698164A (en) 1985-07-29 1987-10-06 Kinetico, Inc. Filter apparatus
US4769135A (en) 1987-03-02 1988-09-06 Culligan International Company Automatic metering system
US4895648A (en) 1988-04-30 1990-01-23 Brita Wasser-Filter-Systeme Gmbh Filter cover for a purification insert in a water treatment device with a hollow tube
US4918426A (en) 1988-05-02 1990-04-17 Amway Corporation Method and apparatus for sensing fluid flow volume to indicate end of filter life
US5089144A (en) 1989-12-08 1992-02-18 Nartron Corporation Filter condition indicator having moveable sensor and aggregate flow counter
JPH04281891A (ja) * 1991-03-12 1992-10-07 Tadashi Nakamura 浄水器用カートリッジフィルター
JPH05277468A (ja) * 1992-04-02 1993-10-26 Tadashi Nakamura 浄水器用カートリッジフィルター
WO1996003193A1 (fr) * 1994-07-26 1996-02-08 Big 'o' Inc. Dispositif de filtrage et d'obturation
US5900138A (en) 1994-10-28 1999-05-04 Laica S.R.L Vessel for filtering liquids, particularly drinking water having device for counting occasions of vessel access
WO2005080273A1 (fr) * 2004-02-13 2005-09-01 Pur Water Purification Products, Inc. Dispositif d'arret de cartouche de traitement d'eau
EP1806322A1 (fr) * 2006-01-07 2007-07-11 Wal SA Dispositif de filtration d'eau avec cartouche filtrante remplaçable

Patent Citations (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3038610A (en) * 1959-01-30 1962-06-12 Rohm & Haas Deionization unit with automatic shutoff operable upon exhaustion of resin's ion exchange capacity
US3503507A (en) 1967-06-26 1970-03-31 Bendix Corp Shut-off valve for fuse filter
US3586018A (en) 1969-02-24 1971-06-22 Thermia Verken Ab Self-closing valve
US4302337A (en) * 1977-01-10 1981-11-24 The Dow Chemical Company Separation of oil from water
US4681677A (en) 1978-02-17 1987-07-21 Olin Corporation Water processor having automatic shutoff and bypass means
US4686037A (en) 1985-03-27 1987-08-11 Teledyne Industries, Inc. Water filter apparatus
US4698164A (en) 1985-07-29 1987-10-06 Kinetico, Inc. Filter apparatus
US4769135A (en) 1987-03-02 1988-09-06 Culligan International Company Automatic metering system
US4895648A (en) 1988-04-30 1990-01-23 Brita Wasser-Filter-Systeme Gmbh Filter cover for a purification insert in a water treatment device with a hollow tube
US4918426A (en) 1988-05-02 1990-04-17 Amway Corporation Method and apparatus for sensing fluid flow volume to indicate end of filter life
US5089144A (en) 1989-12-08 1992-02-18 Nartron Corporation Filter condition indicator having moveable sensor and aggregate flow counter
US5089144B1 (en) 1989-12-08 1996-11-12 Nartron Corp Filter condition indicator having moveable sensor and aggregate flow counter
JPH04281891A (ja) * 1991-03-12 1992-10-07 Tadashi Nakamura 浄水器用カートリッジフィルター
JPH05277468A (ja) * 1992-04-02 1993-10-26 Tadashi Nakamura 浄水器用カートリッジフィルター
WO1996003193A1 (fr) * 1994-07-26 1996-02-08 Big 'o' Inc. Dispositif de filtrage et d'obturation
US5900138A (en) 1994-10-28 1999-05-04 Laica S.R.L Vessel for filtering liquids, particularly drinking water having device for counting occasions of vessel access
WO2005080273A1 (fr) * 2004-02-13 2005-09-01 Pur Water Purification Products, Inc. Dispositif d'arret de cartouche de traitement d'eau
EP1806322A1 (fr) * 2006-01-07 2007-07-11 Wal SA Dispositif de filtration d'eau avec cartouche filtrante remplaçable

Also Published As

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