EP1492614A1 - Installation de filtration a courant transversal - Google Patents

Installation de filtration a courant transversal

Info

Publication number
EP1492614A1
EP1492614A1 EP03745733A EP03745733A EP1492614A1 EP 1492614 A1 EP1492614 A1 EP 1492614A1 EP 03745733 A EP03745733 A EP 03745733A EP 03745733 A EP03745733 A EP 03745733A EP 1492614 A1 EP1492614 A1 EP 1492614A1
Authority
EP
European Patent Office
Prior art keywords
valve
filter element
shut
compressed air
line
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP03745733A
Other languages
German (de)
English (en)
Inventor
Eduard Hartmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bucher Guyer AG
Original Assignee
Bucher Guyer 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 Bucher Guyer AG filed Critical Bucher Guyer AG
Publication of EP1492614A1 publication Critical patent/EP1492614A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/14—Ultrafiltration; Microfiltration
    • B01D61/20—Accessories; Auxiliary operations
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L2/00—Non-alcoholic beverages; Dry compositions or concentrates therefor; Their preparation
    • A23L2/02—Non-alcoholic beverages; Dry compositions or concentrates therefor; Their preparation containing fruit or vegetable juices
    • A23L2/08—Concentrating or drying of juices
    • A23L2/082—Concentrating or drying of juices by membrane processes
    • A23L2/087—Concentrating or drying of juices by membrane processes by ultrafiltration, microfiltration
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L2/00—Non-alcoholic beverages; Dry compositions or concentrates therefor; Their preparation
    • A23L2/70—Clarifying or fining of non-alcoholic beverages; Removing unwanted matter
    • A23L2/72—Clarifying or fining of non-alcoholic beverages; Removing unwanted matter by filtration
    • A23L2/74—Clarifying or fining of non-alcoholic beverages; Removing unwanted matter by filtration using membranes, e.g. osmosis, ultrafiltration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/14—Ultrafiltration; Microfiltration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/14—Ultrafiltration; Microfiltration
    • B01D61/18—Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/14—Ultrafiltration; Microfiltration
    • B01D61/22—Controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
    • B01D2321/02—Forward flushing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
    • B01D2321/18—Use of gases
    • B01D2321/185—Aeration

Definitions

  • the invention relates to a cross-flow filtration system of the type mentioned in the preamble of claim 1.
  • Such cross-flow filtration systems are used advantageously when it comes to molecularly disperse or colloidally disperse substance mixtures, at most with proportions of solid or To filter suspended solids.
  • mixtures of substances are mixtures of substances which initially arise in the production of fruit and fruit juices. These mixtures of substances are then separated by filtration into clear fruit or fruit juice on the one hand and the essentially remaining turbid substances on the other.
  • activated carbon can also be added to the mixture of substances before the filtration in order to achieve certain effects. This activated carbon must then also be separated from the liquid with the cloudy substances.
  • a cross-flow filtration system of the type mentioned in the preamble of claim 1 is known from WO-Al-01/51186.
  • a solution is shown here how blockages of the filtration module can be removed by fixed retentate portions.
  • the problem with systems of this type is that the filter elements can become blocked, so that production has to be interrupted in order to first remove the blockages. Production interruptions are undesirable.
  • a membrane filter system is known from WO-A2-02 / 26363. It contains a device for fumigation. By gassing the mixture of substances to be filtered, the pressure difference between the inlet and outlet of the membrane filter module can be changed, so that it becomes zero, for example, which should improve the efficiency of the filtration system.
  • the invention has for its object to provide a cross-flow filtration system in which blockages of the filter element are avoided even in the event of unforeseeable events.
  • the only figure shows a schematic of a cross-flow filtration system.
  • 1 denotes a filter element in which the desired liquid phase is separated from the mixture of substances.
  • the design of the filter element 1 is not important. The invention is primarily used when the filter element 1 contains, for example, straight or wound tubular membranes or capillary tubes, since such filter elements 1 mostly process substance mixtures with high turbidities. If parts of the filter element 1 become blocked, this regularly leads to an interruption in operation with all its disadvantageous consequences.
  • the mixture of substances to be filtered is located in a product tank 2. From there it passes through a feed line 3 to the filter element 1.
  • a feed pump 4 and a flow meter 5 are inserted into the feed line 3, the speed of the feed pump 4 through the flow meter 5 in the manner It can be controlled or regulated that either the delivery rate through the feed line 3 or the pressure in the feed line 3 at the input of the filter element 1 remains constant. This enables economical production in a known manner.
  • a tank shut-off valve 6 which can be actuated by a motor or pneumatically.
  • a permeate line 7 is connected to it, through which the permeate separated off in the filter element 1, for example the clear fruit juice, can be removed.
  • a return line 8 leads from the filter element 1 to the product tank 2, in which the retentate is returned from the filter element 1 to the product tank 2.
  • a throttle valve 9 is inserted, which can also be actuated by a motor or pneumatically.
  • This throttle valve 9 can be controlled by a retentate line pressure sensor 10, which detects the pressure at the retentate inlet of the filter element 1.
  • a further retentate line pressure sensor 10 ′ can be arranged on the return line 8 directly behind the filter element 1.
  • the one from the Pressure sensor 10 detectable pressure in the feed line 3 immediately before the filter element 1 is related to the delivery rate of the feed pump 4 and the state of the filter element 1.
  • An increase in viscosity can be caused, for example, by an increased proportion of solids or suspended matter in the mixture of substances.
  • the throttle valve 9 can now be opened or closed more or less by motor or pneumatically.
  • a return line shut-off valve 11 which is always open when the retentate leaving the filter element 1 is to be returned to the product tank 2.
  • the mixture of substances in the product tank 2 is conveyed to the filter element 1 with the aid of the feed pump 4 when the tank shut-off valve 6 is open. Permeate is separated from the mixture of substances in filter element 1.
  • the retentate is returned to the product tank 2 through the return line 8 with the return line shut-off valve 11 open.
  • the viscosity of the circulating mixture of substances increases in the course of the filtration process, because the proportion of solid or suspended substances in the mixture of substances increases the more permeate has been separated in filter element 1.
  • the filtration performance drops.
  • the viscosity of the mixture of substances has reached a certain level, the filtration must be stopped, and in good time so that the filter element 1 cannot become blocked.
  • the circulating mixture of substances can therefore be removed from the circuit by opening an outlet valve 12 which is arranged behind the filter element 1.
  • the mixture of substances to be filtered is first fed to the product tank 2 via a product line 13.
  • the feed pump 4 then goes into operation. Initially, the mixture of substances contained in the product tank 2 is relatively low-viscosity.
  • the feed pump 4 is controlled so that the delivery rate through the supply line 3 remains constant.
  • Permeate is separated off in the filter element 1, so that the retentate leaving the filter element 1 has a higher viscosity. This retentate is returned to the product tank 2. Its amount is smaller because of the deposition of permeate in the filter element 1.
  • 13 additional substance mixture is fed through the product line. As the process progresses, the viscosity of the mixture of substances in the product tank 2 increases further and further.
  • the pressure detectable with the retentate line pressure sensor 10 increases. Because this pressure must not exceed a certain limit value with regard to the load capacity of the filter element 1, the feed pump 4 is then regulated so that this limit value is not exceeded. The filtration performance then drops.
  • a rinse water tank 14 is provided, from which rinse water can be fed into the feed line 3 through a rinse line 15.
  • a flush line shut-off valve 16 is used. Between the rinse water tank 14 and the rinse line shut-off valve 16 there is another element, the task of which is to prevent significant amounts of the mixture of substances from flowing back from the feed line 3 to the rinse water tank 14 when the rinse line shut-off valve 16 is opened.
  • the tank shut-off valve 6 is closed more or less simultaneously and the flushing line shut-off valve 16 is opened.
  • the tank shut-off valve 6 and the flushing line shut-off valve 16 are actuated by a control unit 20, with which the filtration process can be controlled.
  • This element preventing the mixture reflux is either a check valve 17 or a reflux throttle 17 ', as is known from the Swiss patent application 0204/02.
  • a compressed air line 25 opens into the supply line 3 to the filter element 1 and can be shut off by a compressed air shut-off valve 26.
  • a compressed air shut-off valve 26 By opening the compressed air shut-off valve 26, the retentate located in the filter element 1 is displaced from the filter element 1 by means of compressed air. So that the compressed air does not penetrate into the feed line 3 and the feed pump 4 and the flow meter 5 arranged therein, it is also necessary to arrange a feed line shut-off valve 28 in the vicinity of the filter element 1 in the feed line 3.
  • the outlet valve 12 known from the Swiss patent application 0204/02 is advantageously arranged directly behind the filter element 1, as shown in the figure.
  • the compressed air shut-off valve 26 is designed according to the invention in such a way that it opens automatically when there is no control.
  • the supply line shut-off valve 28 is such that it closes automatically when there is no control.
  • the throttle valve 9 and the return line shut-off valve 11 or the outlet valve 12 are also designed such that they open automatically when there is no control. If the throttle valve 9 and the return line shut-off valve 11 are of such a nature, the retentate displaced by means of compressed air from the filter element 1 is fed into the product tank 2, which is generally sensible. Alternatively, the outlet valve 12 can also be designed so that it opens automatically. The retentate displaced from the filter element 1 is then passed into a collecting trough 30, so that the maintenance personnel can later decide what should happen to this part of the retentate.
  • valves can be solved in various ways depending on the type of valve and the type of control and also depending on the type of fault. For example, opening or closing in the event of a fault is possible by spring force as well as by a pneumatic control.
  • the compressed air line 25 advantageously has a memory 32. This means that a sufficient amount of compressed air is available in the immediate vicinity of the cross-flow filtration system. In fact, there is often the problem that compressed air lines which are in operation do not have a large cross section and are relatively long.
  • This memory 32 is advantageous in order to guarantee that the filter element 1 is blown out completely and quickly.
  • the size of the store 32 depends on the conditions of the cross-flow filtration system, namely in particular on the dimensions of the filter element 1. Since the generation of compressed air is also ended in the event of a power failure, this store 32 can therefore be indispensable, depending on the conditions of the system to ensure sufficient security.
  • the compressed air in the accumulator 32 advantageously has a pressure of at least 3 bar.
  • the upper limit for the pressure is given by the load limit for the filter element 1 or its membrane tubes.
  • another compressed gas can be used instead of the compressed air, for example nitrogen, which can be removed from a high pressure bottle 34.
  • the reservoir 32 is then supplied with compressed gas from this high-pressure bottle 34, which can be done automatically by means of a pressure reducing valve 35 without the supply of external energy.
  • the membrane tubes can be freed from the retentate using compressed air, as detailed tests have shown.
  • the surprising effect of compressed air is likely to be related to its compressibility. Even when using compressed air for flushing, the membrane tube that is least loaded with solids is flushed out first. As soon as the membrane tube in question is free, the flow rate of the compressed air through this membrane tube will increase sharply and although clearly above the flow rate that is generated with rinse water, because the flow rate of the rinse water is determined by the delivery rate of the feed pump 4 and thus limited. Due to the higher flow velocity of the compressed air, the pressure drop across the membrane tube that was cleared first increases. This has the consequence that a higher differential pressure is available to clear the remaining membrane tubes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Nutrition Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Food Science & Technology (AREA)
  • Polymers & Plastics (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Filtration Of Liquid (AREA)

Abstract

L'invention concerne une installation de filtration à courant transversal comportant au moins un élément filtrant (1), auquel peut être acheminé un mélange de substance provenant d'un réservoir de produit (2), à travers une conduite d'alimentation (3). De l'eau de rinçage peut en outre être acheminée jusqu'à l'élément filtrant (1) à partir d'un réservoir d'eau de rinçage (14). Selon l'invention, il est prévu devant l'entrée de la conduite d'alimentation (3) dans l'élément filtrant (1), une soupape de fermeture de la conduite d'alimentation (28) et une conduite d'air comprimé (25) débouche côté entrée au niveau de l'élément filtrant (1) et peut être fermée par une soupape de fermeture d'air comprimé (26). La soupape de fermeture de conduite d'alimentation (28) se présente de manière à se fermer automatiquement en cas de panne, tandis que la soupape de fermeture d'air comprimé (26) et d'autres soupapes (9, 11 ; 12) sont conçues de sorte à s'ouvrir automatiquement. En cas de pannes, par exemple suite à une coupure de courant, le rétentat situé dans l'élément filtrant (1) est comprimé à l'aide d'air comprimé, de sorte à éviter tout blocage en cas d'arrêt de l'installation. Les perturbations de fonctionnement sous l'effet de blocages de l'élément filtrant (1) sont ainsi évitées.
EP03745733A 2002-04-10 2003-03-25 Installation de filtration a courant transversal Withdrawn EP1492614A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH6062002 2002-04-10
CH606022002 2002-04-10
PCT/CH2003/000195 WO2003084650A1 (fr) 2002-04-10 2003-03-25 Installation de filtration a courant transversal

Publications (1)

Publication Number Publication Date
EP1492614A1 true EP1492614A1 (fr) 2005-01-05

Family

ID=28679880

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03745733A Withdrawn EP1492614A1 (fr) 2002-04-10 2003-03-25 Installation de filtration a courant transversal

Country Status (5)

Country Link
EP (1) EP1492614A1 (fr)
CN (1) CN1646210A (fr)
AU (1) AU2003210115A1 (fr)
PL (1) PL370708A1 (fr)
WO (1) WO2003084650A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102601135A (zh) * 2012-03-12 2012-07-25 启东市南方润滑液压设备有限公司 乳化液系统浮油吹扫装置

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06226065A (ja) * 1993-02-01 1994-08-16 Hitachi Plant Eng & Constr Co Ltd 膜洗浄方法
JPH07236818A (ja) * 1994-02-25 1995-09-12 Dick Deguremon Kk 内圧式中空糸モジュールの逆洗方法
JP3615918B2 (ja) * 1997-10-08 2005-02-02 三菱重工業株式会社 逆浸透膜モジュールの洗浄方法及び装置
WO2000003794A1 (fr) * 1998-07-13 2000-01-27 Bucher-Guyer Ag Procede et dispositif pour melanger des fluides dans une conduite
NL1010544C2 (nl) * 1998-11-13 2000-05-16 Stork Friesland Bv Werkwijze en inrichting voor het met behulp van membraanfiltratie uit een vloeistof verwijderen van zwevende stoffen en zouten.
JP2003508194A (ja) * 1999-08-26 2003-03-04 ブーハー−グイアー・アクチェンゲゼルシャフト クロスフローろ過方法およびこの方法を実施する設備
WO2001051186A1 (fr) * 2000-01-13 2001-07-19 Bucher-Guyer Ag Procede et dispositif pour liberer des chemins d'ecoulement dans des modules de filtration
AT408955B (de) * 2000-09-28 2002-04-25 Va Tech Wabag Gmbh Membranfilteranlage und verfahren zum filtern

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03084650A1 *

Also Published As

Publication number Publication date
WO2003084650A1 (fr) 2003-10-16
AU2003210115A1 (en) 2003-10-20
CN1646210A (zh) 2005-07-27
PL370708A1 (en) 2005-05-30

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