WO1999016528A1 - Filtre regenerable pour liquides, notamment alimentaires - Google Patents
Filtre regenerable pour liquides, notamment alimentaires Download PDFInfo
- Publication number
- WO1999016528A1 WO1999016528A1 PCT/FR1998/002072 FR9802072W WO9916528A1 WO 1999016528 A1 WO1999016528 A1 WO 1999016528A1 FR 9802072 W FR9802072 W FR 9802072W WO 9916528 A1 WO9916528 A1 WO 9916528A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- grid
- cartridge
- filtration device
- polymer
- filtration
- Prior art date
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
- B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
- B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
- B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/007—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with multiple filtering elements in series connection
- B01D24/008—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with multiple filtering elements in series connection arranged concentrically or coaxially
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/02—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration
- B01D24/04—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration the filtering material being clamped between pervious fixed walls
- B01D24/08—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration the filtering material being clamped between pervious fixed walls the filtering material being supported by at least two pervious coaxial walls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/46—Regenerating the filtering material in the filter
- B01D24/4631—Counter-current flushing, e.g. by air
Definitions
- the invention relates to a new filtration device using a regenerable material and more particularly although not exclusively, intended for “edible” liquids, such as in particular wine, beer, non-alcoholic drinks and in particular the products obtained by fermentation, from which we want to extract cell residues, especially yeast, as well as water.
- “edible” liquids such as in particular wine, beer, non-alcoholic drinks and in particular the products obtained by fermentation, from which we want to extract cell residues, especially yeast, as well as water.
- filter cartridges are provided with a central tube intended to allow the evacuation of the filtrate, around which is placed a filtering medium generally in pleated form.
- the liquid to be filtered is conveyed perpendicularly, that is to say radially with respect to the crown, in the context of a frontal filtration, and the filtrate is collected in the central core, coaxial with the constituent crown of the cartridge.
- the object of the invention is to provide a filter for edible liquid, including water, capable of being regenerated and in the form of a cartridge, capable of being placed at a level conventional type filtration stage.
- This filtration device for food liquids consists of at least one cartridge comprising a volume in the form of a cylindrical crown defined by a cylindrical external grid, at the level of which the liquid to be filtered arrives, and an internal support grid concentric with the grid exterior, said volume being completely filled with a regenerable filter medium.
- the filtering medium consists of glass or polymer microbeads, optionally supplemented with fibers based on cellulose or polymer, the whole being coated with a hydrophobic polymer insoluble in aqueous phase.
- this insoluble polymer is chosen from the group comprising ethylcellulose, carboxylmethylcellulose and polyethylene.
- the size of the beads is between 1 and 150 micrometers and advantageously between 20 and 80 micrometers.
- a method for ensuring the coating of such microbeads is, for example, taught in document EP-A-0 462 003.
- a method is described by which spherical microparticles are coated with an enteric material, based on the implementation of a drying phase by atomization or nebulization of an emulsion of the oil-in-water type obtained from the oily liquid with which the microparticles are to be coated, and from an aqueous solution of polymers of materials d 'gastro-resistant coating mixed with at least one emulsifying agent.
- the coating technique uses an organic solution of hydrophobic polymers containing from 1 to 10% by weight of polymers. This solution also comprises between 22 and 25% by weight of microbeads, and preferably between 7 and 20% by weight of cellulose fibers.
- the aqueous phase preferably contains between 1 and 15% by weight of fibers, in particular cellulose.
- a first mixture of the hydrophobic polymer solution is made with the microbeads, for example made of glass and cellulose fibers, and a second mixture of fibers, in particular cellulose with water, then these are mixed together two compositions.
- spray drying is carried out using an atomizer of a dispersion of the mixture thus obtained in an aqueous cellulose solution.
- This dispersion is finely sprayed by passing through a nozzle or a turbine.
- the droplets thus formed pass through an air flow established co-current or counter-current and brought to a controlled temperature, in particular 180 ° C at the inlet and 90 ° C at the outlet of the atomizer.
- the powder made up of microbeads with coated fibers is collected at the base of the atomizer.
- the external grid includes orifices or pores flaring towards the interior of the crown and advantageously being in the form of juxtaposed cones or pyramids, the base of which constitutes the external surface of the grid, and the top is directed radially towards the inside of the cartridge.
- the internal grid of traditional structure also provides the support or spacer function between the two ends of the cartridge and is also intended to receive at each of its ends a plastic tip. or metallic ensuring the cohesion of the whole.
- This grid is coated on the one hand, with an internal membrane, also of filtration, in particular made of polymers, capable of resisting diluted acids and bases of washing, and at a temperature of 80 ° C., such as for example the polysulfones.
- This membrane is in turn advantageously coated with a protective grid.
- the external grid of a traditional type for example made of stainless steel
- a porous filter medium the pores of which are relatively large, and such as for example a sleeve made of polyethylene or porous polypropylene.
- the invention also provides a filter using a plurality of concentric cartridges capable of optimizing the filtration properties of the final cartridge thus obtained.
- the external cartridge is intended above all to ensure coarse filtration of the liquid to be filtered and the internal cartridge to ensure a finishing filtration.
- Figure 1 is a schematic sectional view of a front mode filtration cartridge, placed at a housing.
- Figure 2 is a view similar to Figure 1 according to a mixed tangential / frontal filtration mode.
- FIG. 3 is a schematic representation similar to FIGS. 1 and 2, of an inverted mixed filter cartridge with double strainer, of which FIG. 4 is a cross-sectional view of the central zone of a variant.
- FIGS 5, 6 and 7 are schematic representations in detail of filter cartridges according to the invention, respectively implemented according to a tangential, frontal filtration mode and a double coaxial cartridge.
- the present invention is more particularly described in connection with the filtration of edible liquids, in particular of wines.
- the scope of this cannot be limited to this single application, and any other possible application of filtration using a cartridge of the type of those described below is of course covered by the present invention.
- the circuit for circulating the liquid to be filtered is shown diagrammatically in FIG. 1 at the level of a cartridge according to the invention installed at the level of a casing.
- This cartridge referenced (1), is inserted within a casing (2) constituting the filtration tank.
- the liquid to be filtered is introduced at the upper end of the casing (2) through an inlet (3) supplied by a pump (4).
- the liquid to be filtered passes through the cartridge (1) substantially radially from the outside towards the inside and the filtrate is collected in the central channel (5), in order to be evacuated at the outlet (6) formed at the lower end of the tank housing (2).
- the direction of circulation of the liquid is reversed.
- the washing liquid is introduced through the outlet (6) and passes through the cylindrical filter cartridge substantially radially from the inside to the outside, collecting a certain number of the particles in suspension and other yeasts.
- the washing liquid thus loaded is evacuated from the casing (2) by the inlet (3), the direction of operation of the pump (4) then being reversed.
- FIG. 2 is a schematic representation of the operating mode of a tangential / frontal mixed filtration implementing a filtration cartridge.
- the liquid to be filtered is conveyed in lower zones (7) of the casing, the liquid to be filtered propagates in a vertical direction tangentially with respect to the external surface of the cartridge (1).
- the width of the space (8) defined between the cartridge (1) and the external wall of the casing (2) is reduced to optimize tangential filtration.
- this tangential filtration makes it possible mainly to eliminate particles and other materials in suspension of larger dimensions, this tangential filtration being accompanied in parallel by a frontal filtration within the filtering medium contained in the cartridge (2) by effect. depth. This gives a filfrat devoid of suspended particles, or even colloids, which is also collected in the central channel (5) of the cartridge, and which is evacuated at the upper outlet (9), as can be seen. '' observe in figure 2.
- the liquid to be filtered having undergone tangential filtration is recycled, by means of a pipe (10) and a pump (11), redirecting it to the level of the inlet (7) of the casing.
- the recycled filter liquid is also refilled with raw filter liquid by means of a pump (12) and a pipe (13).
- a drain valve (14) allows the evacuation of the concentrate obtained after a plurality of tangential filtration cycles.
- the cartridge is regenerated by subjecting it to washing, possibly adding a treatment in an appropriate medium, for example alkaline, acid or neutral.
- the washing liquid follows an opposite path to that of the liquid to be filtered.
- the filter medium placed at the level of the cartridge is a regenerable filter medium.
- this filtering medium consists of glass or polyethylene microbeads coated or encapsulated with a hydrophobic polymer, in particular consisting of ethylcellulose, carboxymethylcellulose or even polyethylene.
- the filtering medium not only consists of microbeads but also comprises other constituents, for example in the form of fibers, such as cellulose or polyethylene fibers, or even polypropylene, l 'microbeads plus fibers assembly being in turn coated or encapsulated in the hydrophobic polymer.
- fibers such as cellulose or polyethylene fibers, or even polypropylene, l 'microbeads plus fibers assembly being in turn coated or encapsulated in the hydrophobic polymer.
- only the microbeads are coated, or only the fibers are coated.
- Ethylcellulose is dissolved in dichloromethane with stirring for about 15 minutes.
- Glass microbeads the diameter of which is between 40 and 80 ⁇ m, are dispersed, as well as cellulose fibers in the solution thus obtained. At the same time, cellulose fiber fibers are dissolved in water.
- the two solutions thus obtained are vigorously mixed, for example by means of a paddle mixer.
- the dispersion is then atomized.
- the atomizer is for example of the PC3 nozzle type (Niro atomizer), the compressed air pressure of which is adjusted to 3.10 5 Pa, and the inlet and outlet temperatures of which are respectively fixed at 180 ° C. and 90 ° VS .
- this filtering medium is regenerable. In fact, it is regenerated by simple washing, which it has been found that it does not alter the filterability characteristics and does not cause contamination in particular during the recycling of the filter medium thus regenerated. Furthermore, this medium has very good mechanical resistance and a favorable adaptation of the porosity. This washing can be carried out in a conventional manner using alkaline, neutral or acid solutions, optionally in the presence of enzymes.
- the size of the microbeads constituting the filtering medium is between 1 to 150 micrometers, and preferably, between 20 and 80 micrometers.
- the glass or polymer beads can be solid or hollow depending on the desired density.
- the coating product by appropriately selecting the coating product, it is possible to impart a surface or included electrical charge to the particles constituting the filtering medium. This makes it possible to create in the volume of the medium, large electric field strengths, capable of improving the filtration performance.
- FIG. 3 shows a view similar to FIGS. 1 and 2, in which it is desired to set up an inverted mixed filtration with a double strainer, that is to say with a double grid.
- the central channel of the cartridge receives a core (16), also central, intended to reduce the section of said central channel (20), and therefore increase the tangential speed of the liquid to be filtered at the level of the internal grid (17) of the cartridge. (1), said liquid being introduced into the central zone through the inlet (15). In this case, there is first of all tangential filtration along the internal grid (17), then evacuation of the liquid to be filtered by a pipe (21) for recycling (idem figure 2).
- this tangential filtration is accompanied by a frontal filtration, taking place substantially radially from the inside to the outside of the cartridge.
- the filtrate resulting from this double filtration is collected at the periphery of the casing (2), then evacuated by the outlet (19) in the direction of a storage place.
- the grids (17) and (18) consist for example of annular horizontal bars of trapezoidal section, as can be seen in FIG. 2, the base of which is directed inward and outward respectively.
- a variant of this embodiment shown in cross section in FIG. 4, can consist in installing bars which are no longer horizontal but vertical, that is to say, parallel to the direction of movement of the liquid to be filtered.
- FIG. 5 shows a detailed view of a mixed filtration cartridge according to the invention, that is to say allowing both frontal and tangential filtration.
- This cylindrical cartridge basically comprises a cylindrical frame constituting support grid (29), defining a central channel (31), intended to allow the evacuation of the filtrate, symbolized by the upward arrow.
- the cartridge also comprises an external grid (25), made up of annular bars of trapezoidal section or of a bar of trapezoidal section shaped in a spiral, defining between them an interval of determined dimension, depending on the degree of coarse filfration desired.
- the volume defined by on the one hand, the internal grid (29) - internal membrane (28) - protective grid (27) and on the other hand by the external grid (25) is filled by a filtering medium (26 ) of the type described above.
- the filtering medium is introduced and put in place as follows within the cartridges according to the invention.
- the microbeads optionally added with fibers, are suspended in water, the suspension thus obtained being homogenized, in particular by stirring.
- a pump injects the mixture thus homogenized under pressure into the volume in the form of a crown defined by the external and internal grids.
- the microbeads are fixed on the polusulfone membrane coating the internal grid, the water in the suspension being evacuated by simple gravity through orifices not shown formed at the base of the cylindrical crown and the adjacent plug.
- the thickness of microbeads at the level of the polysulfone membrane increases until it occupies the entire available volume, defined by the two grids, respectively internal and external.
- the microbeads are in intimate contact with each other, leaving no gap between them, likely to allow privileged passage, and therefore, to decrease the filtration performance of the cartridge thus obtained. It is possible to play slightly on the microbead concentration, by varying the injection pressure of the mixture in the crown. However, the room for maneuver thus defined is relatively limited.
- a thickness of filtering media is typically obtained, from 13 to 14 millimeters thick, for which a very significant change in filtration performance is observed compared to traditional cartridges.
- these performances are at least improved by a factor of two.
- the base of the cartridge is closed by a plastic or metal tip (33), possibly provided with a flat seal (32).
- the upper end of the cartridge also receives a plastic or metal tip (30), provided in its center with an orifice, the diameter of which corresponds substantially to that of the internal channel (31).
- the internal support assembly is identical to that of the previous cartridge.
- the external grid (34) is traditional and similar to the internal grid (29). Furthermore, it is covered with an external porous filtering medium (35), in particular constituted by a sleeve made of porous polyethylene or polypropylene.
- the rest of the structure of this cartridge is identical to the cartridge described in connection with FIG. 5.
- the filtration device in fact comprises several cartridges in accordance with the invention, mounted coaxially and concentrically with each other.
- these cartridges there are two of these cartridges, namely an external cartridge, produced so as to allow mixed tangential and frontal filtration, mounted on the periphery of the filfration device, and more particularly intended to ensure coarse filtration, and an internal cartridge, therefore of the same axis of revolution as the external cartridge, intended to ensure a more thorough filtration.
- the external cartridge has a structure substantially similar to that of the cartridge described in connection with FIG. 5. It comprises in particular an external grid (36), consisting of a juxtaposition of annular bars of triangular section, a regenerable filter medium (37) , consisting of glass or polymer microbeads, coated in a hydrophobic polymer, in particular based on cellulose, a porous filter medium (38) and a support grid (39), the latter constituting the external frame of the internal cartridge.
- this in turn comprises a regenerable filter medium (40), then an internal membrane (41) and finally a support grid (42), defining a central channel (43).
- the two filter media are different.
- One is, for example, made up of microbeads alone, the other on the other hand, includes microbeads and fibers, or even simply made of resin.
- the cohesion of the two cartridges according to this configuration is further ensured by two metal or plastic end pieces (44) and (45), respectively mounted at the two ends of the assembly thus formed, the end piece (45) completely closing off the central channel (43).
- the upper end of the assembly also receives a plastic or metal plug (46), which is fixed on a member (47) emerging from the end piece (44), either by snap-fastening, or by simple screwing.
- the plug (46) and the endpiece (44) are pierced in their center with a through hole, of diameter substantially equal to that of the central channel (43), and aligned with the latter when they are put in place.
- the fixing member (47) is also pierced in its center with a through orifice, of the same diameter as said orifices, these different orifices being intended to allow either the passage and the evacuation of the filtrate, or the introduction of the washing liquid, when the assembly is subjected to a washing phase with a view to its regeneration.
- This filtration device thus proves to be particularly suitable for the filtration of food liquids, such as wines, beers, non-alcoholic drinks, but more generally for the filtration of water and other food liquids, insofar as it also allows the retention of colloids and organic matter.
- this filtration device also makes it possible to drastically limit pollution, since first of all, no more diatomaceous earth is used, and on the other hand, the washing liquids used are neutralized.
- the filtration device according to the invention makes it possible to filter very loaded liquids without risk of clogging, and this in a very easy way and for low costs.
- the filtration device according to the invention also proves to be particularly suitable for the treatment of effluents.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU93536/98A AU9353698A (en) | 1997-09-29 | 1998-09-28 | Regenerable filter for liquids, in particular food liquids |
EP98946513A EP1019170A1 (fr) | 1997-09-29 | 1998-09-28 | Filtre regenerable pour liquides, notamment alimentaires |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9712304A FR2768940B1 (fr) | 1997-09-29 | 1997-09-29 | Filtre regenerable pour liquides, notamment alimentaires |
FR97/12304 | 1997-09-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999016528A1 true WO1999016528A1 (fr) | 1999-04-08 |
Family
ID=9511759
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1998/002072 WO1999016528A1 (fr) | 1997-09-29 | 1998-09-28 | Filtre regenerable pour liquides, notamment alimentaires |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1019170A1 (fr) |
AU (1) | AU9353698A (fr) |
FR (1) | FR2768940B1 (fr) |
WO (1) | WO1999016528A1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008092261A1 (fr) * | 2007-02-02 | 2008-08-07 | Prosep Inc. | Ensemble cartouche cylindrique avec des panneaux de paroi interverrouillables |
CN104773854A (zh) * | 2015-03-19 | 2015-07-15 | 无锡市宏腾塑胶厂 | 用于净水机的硅藻精土滤芯 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2022162517A1 (fr) * | 2021-01-28 | 2022-08-04 | Netafim Ltd | Système de filtration d'un liquide |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0071961A2 (fr) * | 1981-08-06 | 1983-02-16 | Kojicic, Djurdjina | Tamis filtrant à double paroi pourvu de jointures perforées |
US5290457A (en) * | 1989-12-29 | 1994-03-01 | Seitz-Filter-Werke Gmbh & Co. | Filter element with regenerable bulk material filling and method for making same |
-
1997
- 1997-09-29 FR FR9712304A patent/FR2768940B1/fr not_active Expired - Fee Related
-
1998
- 1998-09-28 AU AU93536/98A patent/AU9353698A/en not_active Abandoned
- 1998-09-28 EP EP98946513A patent/EP1019170A1/fr not_active Withdrawn
- 1998-09-28 WO PCT/FR1998/002072 patent/WO1999016528A1/fr not_active Application Discontinuation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0071961A2 (fr) * | 1981-08-06 | 1983-02-16 | Kojicic, Djurdjina | Tamis filtrant à double paroi pourvu de jointures perforées |
US5290457A (en) * | 1989-12-29 | 1994-03-01 | Seitz-Filter-Werke Gmbh & Co. | Filter element with regenerable bulk material filling and method for making same |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008092261A1 (fr) * | 2007-02-02 | 2008-08-07 | Prosep Inc. | Ensemble cartouche cylindrique avec des panneaux de paroi interverrouillables |
CN104773854A (zh) * | 2015-03-19 | 2015-07-15 | 无锡市宏腾塑胶厂 | 用于净水机的硅藻精土滤芯 |
Also Published As
Publication number | Publication date |
---|---|
AU9353698A (en) | 1999-04-23 |
FR2768940B1 (fr) | 1999-11-26 |
FR2768940A1 (fr) | 1999-04-02 |
EP1019170A1 (fr) | 2000-07-19 |
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