EP0892663A1 - Dispositif pour filtrer un fluide - Google Patents

Dispositif pour filtrer un fluide

Info

Publication number
EP0892663A1
EP0892663A1 EP97945653A EP97945653A EP0892663A1 EP 0892663 A1 EP0892663 A1 EP 0892663A1 EP 97945653 A EP97945653 A EP 97945653A EP 97945653 A EP97945653 A EP 97945653A EP 0892663 A1 EP0892663 A1 EP 0892663A1
Authority
EP
European Patent Office
Prior art keywords
piston
filter
housing
valve
fluid
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Withdrawn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
EP97945653A
Other languages
German (de)
English (en)
Inventor
Wolfram Kalt
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.)
Lenzing AG
Original Assignee
Lenzing AG
Chemiefaser Lenzing 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 Lenzing AG, Chemiefaser Lenzing AG filed Critical Lenzing AG
Publication of EP0892663A1 publication Critical patent/EP0892663A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/114—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements arranged for inward flow filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
    • B01D29/668—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with valves, e.g. rotating valves for coaxially placed filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/70—Regenerating the filter material in the filter by forces created by movement of the filter element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/96—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor in which the filtering elements are moved between filtering operations; Particular measures for removing or replacing the filtering elements; Transport systems for filters

Definitions

  • the invention relates to a device for filtering a fluid.
  • the invention relates in particular to a backwash filter with which viscous, thermally unstable masses, e.g. Spinning masses, can be filtered.
  • fluid, viscous mass or spinning mass is used in particular for a solution which contains cellulose and an aqueous tertiary amine oxide and which can be processed into cellulosic moldings of any kind, in particular fibers and films .
  • the preparation and processing of the dope is generally referred to below as the amine oxide process for the sake of simplicity.
  • Tertiary amine oxides offer an advantage as alternative solvents in that, in contrast to the viscose process, NMMO dissolves the cellulose in a non-derivatizing manner, which means that the cellulose does not have to be regenerated chemically, the NMMO remains chemically unchanged and passes into the coagulation bath when it is precipitated and can be reused for a new solution preparation.
  • the NMMO process thus opens up the possibility of a closed solvent cycle.
  • NMMO has extremely low toxicity.
  • a backwashable filter system is known from EP-A - 0 305 606, a wave-shaped arrangement being installed in the storage space of a filter basin in such a way that, with a partially opened sludge water flap, a direct outflow of the fluidized granular filter material into the sludge water outlet - and thus the loss Filter material - prevented.
  • the backwash filter according to DE-A 37 05 803 has a filter chamber into which a cylindrical filter insert, through which the medium to be filtered flows, is inserted from the inside.
  • This filter insert has an inner cage, the cylindrical wall of which has essentially horizontally extending, slit-like windows which are separated from one another by webs, and in the interior of which an axially movable slide which removes the filter residues is arranged.
  • EP-A-0 411 163 describes a filter device with continuous cleaning of the filter surface.
  • the device contains a cylindrical housing with an inlet opening and an outlet opening.
  • a sleeve with a filtering side surface and an internal cavity serves as the filter element.
  • a scraper element is connected to a drive and mounted in an annular space which is formed between the inner surface of the housing and the filtering outer surface of the sleeve.
  • the scraper element is in the form of at least one.
  • Spiral belt executed, which surrounds the sleeve and cooperates with the filter surface thereof.
  • EP-A-0 572 369 by the applicant discloses a backwashable filter device for the filtration of highly viscous liquids, which is completely closed and can be used as a so-called "inline filter device”.
  • the present invention has for its object to provide a device for filtering a fluid, in particular a backwash filter, with which viscous, thermally unstable masses, e.g. Spinning masses of the amine oxide process, can be filtered, and with which the filter can be replaced easily, e.g. cannot be adequately cleaned despite backwashing.
  • a backwash filter with which viscous, thermally unstable masses, e.g. Spinning masses of the amine oxide process, can be filtered, and with which the filter can be replaced easily, e.g. cannot be adequately cleaned despite backwashing.
  • the device according to the invention for filtering a fluid is characterized by a housing which consists of two parts which are fixedly connected to one another but are spaced apart, the first part having an inflow channel for the fluid to be filtered and the second part an outflow channel for filtered fluid is; a piston which is slidably mounted in the housing and has a front valve, a filter, a valve body and a rear valve, wherein the filter is arranged after the front valve and before the rear valve and the valve body has a collecting channel for filtered fluid, which communicates with the filter and a filtrate space, which is provided in the second part of the housing and to which the outflow channel connects; the part of the piston which carries the filter can be brought between the two parts of the housing by displacing the piston, and the housing and piston are designed such that the inflow channel and the outflow channel are closed, when the piston part carrying the filter is between the two parts of the housing.
  • the housing By dividing the housing into two, a space can be created between the two parts in which the filter is easily accessible for easy replacement. For this purpose, the piston is moved so that the filter part is brought into this room.
  • An expedient embodiment of the device according to the invention is characterized in that the valve body in the filtering position of the piston seals against both the first part and the second part of the housing, so that essentially no fluid can escape from the device.
  • a particularly preferred embodiment of the device according to the invention is that the valve body in the filtering position of the piston does not completely seal against both the first part and the second part of the housing, so that fluid can escape from the device.
  • This embodiment of the device according to the invention is particularly suitable for filtering cellulosic spinning materials of the amine oxide process, as will be explained in the following.
  • NMMO N-Methylmorpholine-N-Oxide
  • Amine oxides also generally have only limited thermal stability, which varies depending on the structure.
  • the NMMO monohydrate is present under normal conditions as a white crystalline solid which melts at 72 ° C.
  • the anhydro compound on the other hand, only melts at 172 "C.
  • a strong discoloration occurs from 120/130 ° C. From 175 ° C, an exothermic reaction is triggered with complete drainage of the melt and violent gas evolution with an explosive course, with temperatures above 250 ° C can be reached.
  • EP-A-0 652 098 discloses a process for the filtration of a thermally unstable polymer melt, with dead spaces to be avoided.
  • the invention is based on the finding that the problems caused by a degenerate cellulose solution which adheres to metal surfaces between the piston and the housing in conventional backwashable filtering devices cannot be effectively solved by the components used avoiding a gap between them Piston and housing are sealed as completely as possible, as is attempted in the prior art, but that on the contrary, a gap is to be provided, from which cellulose solution can escape and cannot accumulate and decompose on the piston or on the housing.
  • a backwash filter which is completely new for the amine oxide process can be designed in such a way that an annular gap is provided between the piston and the housing, through which spinning mass can emerge continuously and uniformly.
  • the annular gap should be so large that the speed of the product removal is expediently so high that the degradation of the spinning mass, which is dependent on the temperature and dwell time in the device, is not sufficient for the metal surfaces to be corroded.
  • the piston is expediently mounted in the housing such that the valve body forms annular gaps with the two parts of the housing.
  • guide elements can be provided which are firmly connected to the valve body of the piston and are slidably mounted in the two parts of the housing.
  • the piston has a further valve which is provided between the front valve and the valve body.
  • the reference numerals la and lb denote a housing consisting of two parts, the parts being connected to one another, for example via the screw connections 2, 3, but being spaced apart.
  • a piston 4 is movably mounted in the housing 1a, 1b. The piston 4 can be moved forwards and backwards via a device 5. This movement is indicated by a double arrow. Due to the movement of the piston 4, it can be moved into certain positions, which enables operation as a backwash filter.
  • the piston 4 essentially consists of a front valve 7, to which the filter 9 is connected, a valve body 10 and a rear valve 11.
  • FIG. 1 shows the operating position of the backwash filter, that is, the position of the piston 4 in which the viscous mass or spinning mass is filtered.
  • the mass to be filtered is pressed into the housing la via the inflow channel 6, flows around the front valve 7 and is pressed through the filter 9, since the valve body 4 seals against the housing part la except for a small annular gap 12 provided according to the invention. Due to the annular gap 12 provided according to the invention, through which small amounts of spinning material are always pressed outwards, no spinning material can adhere to the sealing surfaces.
  • the mass filtered through the filter 9 passes into the collecting duct 13, which leads through the valve body 10, and subsequently into the filtrate chamber 14 of the housing part 1b, in which the rear valve 11 is located.
  • the valve body 10 also seals the housing part 1b apart from a small annular gap 15 provided according to the invention, which also prevents the spinning mass from sticking to the valve body 10.
  • the filtered spinning mass finally passes from the filtrate chamber 14 into the outflow channel 18, from which it is finally released.
  • a further annular gap 16 is provided in the housing part 1b, which fulfills the same function as the annular gaps 12 and 15.
  • a guide rod 20 can be provided, which is attached to the rear end of the valve body 4 and protrudes into a corresponding channel 21 in the housing part 1b.
  • This guide rod 20 follows every movement of the piston 4.
  • a small hole (not shown) is provided in the housing part 1b in order to prevent that in the channel 21 as a result of the movement of the guide rod 20, an overpressure or underpressure arises.
  • annular gaps 12, 15 and 16 it must be said that they must be selected so that at a given pressure in the backwash filter spinning mass can escape and does not accumulate as a coating on the piston 4. It is obvious that small ring gaps must be short enough so that spinning mass can still escape. In contrast, larger ring gaps can be correspondingly longer. The person skilled in the art can thus match the size and length of the gaps to one another by simple experimentation.
  • FIG. 2 shows the backwash filter shown in Figure 1 reduced.
  • the piston 4 is also in the filtering position, which has already been described with reference to FIG. 1.
  • Figures 3 and 4 show the backwash filter shown in Figure 2, however, the piston occupies 4 different positions.
  • reference numerals have been shown in FIGS. 2 to 4 only to the extent that they are necessary for understanding.
  • FIG. 2 shows the backwash filter, the piston 4 being in the filtering position.
  • the piston 4 is shown slightly moved to the right, whereby the front valve 7 seals against the housing part la.
  • the valve body 10 no longer seals against the housing part la.
  • the filter 9 can be backwashed.
  • filtered spinning mass is pressed through the outflow channel 18 into the filtrate chamber 14.
  • the spinning mass reaches the filter 9 to be cleaned through the collecting duct 13 and passes through the filter, the impurities adhering to the filter being lifted off.
  • the backwashed spinning mass reaches the outside.
  • the piston 4 is already so far to the right that the rear valve 11 closes the housing part 1b on the outlet side.
  • the front valve 7 in turn closes with the housing part la.
  • the filter 9 is now between the housing parts la and lb, so that it can be easily replaced. The position shown in FIG. 5 thus enables the filter 9 to be replaced.
  • FIG. 8a and 8b designate a housing which in turn consists of two parts, the parts being fixedly connected to one another via the screw connections 17, 18, but being spaced apart from one another.
  • a piston 22 is movably mounted in the housing 8a, 8b. The piston 22 can be moved forwards and backwards via a device 23. This movement is indicated by a double arrow. The piston 22 can be moved into certain positions by the movement of the piston, which enables operation as a backwash filter.
  • the piston 22 essentially consists of a front valve 24, a central valve 25 to which the filter 26 is connected, a valve body 27 and a rear valve 28.
  • FIG. 5 shows the operating position of the backwash filter, that is, the position of the piston 22 in which the viscous mass or spinning mass is filtered.
  • the mass to be filtered is pressed into the housing 8a via the inflow channel 29, flows around the front and middle valves 24 and 25, and is pressed through the filter 26, since the valve body 22 against the housing part 8a except for a small one provided according to the invention Seals annular gap 30. Due to the annular gap 30 provided according to the invention, through which small amounts of spinning material are always pressed outwards, no spinning material can adhere to the sealing surfaces.
  • the mass filtered by the filter 26 reaches the collecting channel 31, which leads through the valve body 27, and subsequently into the filtrate space 32 of the housing part 8b, in which the rear valve 28 is located.
  • the valve body 27 also seals the housing part 8b except for a small annular gap 33 provided according to the invention, which also prevents spinning mass from sticking to the valve body 27.
  • the filtered spinning mass finally passes from the filtrate space 32 into the outflow channel 34, from which it is finally released.
  • a further annular gap 35 is provided in the housing part 8b, which fulfills the same function as the annular gaps 30 and 33.
  • guide rods 36 which are fastened to the valve body 27 and protrude into corresponding channels 37, 38, 39, 40 in the two housing parts 8a and 8b. These guide rods 36 follow every movement of the piston 22. At the ends of the channels 37, 38, 39, 40 small bores (not shown) are provided in the housing parts 8a, 8b to prevent that in the channels 37, 38, 39, 40 due to the movement of the guide rods 36 an over - or a negative pressure develops.
  • FIG. 6 shows the backwash filter shown in FIG. 5 on a smaller scale.
  • the piston 22 is also in the filtering position, which has already been described with reference to FIG. 5.
  • Figures 7 to 9 show the backwash filter shown in Figure 6, but the piston 22 assumes different positions.
  • reference numerals have been shown in FIGS. 6 to 9 only to the extent that they are necessary for understanding.
  • FIG. 6 shows the backwash filter, with the piston 22 in the filtering position.
  • the piston 22 is shown moved somewhat to the right, as a result of which the valve body 27 is no longer against the housing part 8a seals.
  • the filter 26 can be backwashed.
  • filtered spinning mass is pressed through the outflow channel 34 into the filtrate chamber 32.
  • the spinning mass reaches the filter 26 to be cleaned through the collecting channel 31 and passes through the filter, the impurities adhering to the filter being lifted off.
  • the backwashed spinning mass reaches the outside.
  • the supply of spinning mass which reaches the backwashing filter through the inflow channel 29, does not have to be interrupted, since recesses 42 are provided on the front valve 24, through which to a certain extent spinning mass can still reach the filter.
  • this supplied spinning mass does not penetrate through the filter due to the rewinding, but sweeps along the surface of the filter and also emerges at the opening 41. In this way it is ensured that all impurities which are lifted from the filter 26 during rewinding are transported out through the opening 41.
  • valves design and arrangement of the valves and the corresponding spaces in the housing by means of the respective closing or opening of the inflow and outflow channel by means of the valves cause the change between filtration, backwashing and screen change without the channels being connected, for example, to a spatially separate backwashing channel.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtration Of Liquid (AREA)

Abstract

L'invention concerne un dispositif pour filtrer un fluide comprenant un carter composé de deux parties (1a, 1b) solidaires mais distantes. La première partie (1a) contient un canal d'admission (6) pour le fluide à filtrer et la seconde partie (1b) contient un canal d'évacuation (18) pour le fluide filtré. Ce dispositif comporte également un piston (4) logé de façon mobile dans le carter, une soupape (7) antérieure, un filtre (9), un corps de soupape (10) et une soupape (11) postérieure. Le filtre est implanté en aval de la soupape antérieure et en amont de la soupape postérieure. Le corps de soupape possède un canal collecteur (13) pour le fluide filtré, ce canal collecteur étant raccordé au filtre et à un compartiment à filtrat (14) prévu dans la seconde partie (1b) du carter et communiquant avec le canal d'évacuation (18). Par déplacement du piston (4), la partie du piston portant le filtre (9) peut être amenée entre les deux parties du carter. Le carter et le piston sont conçus de telle manière que le canal d'admission (6) et le canal d'évacuation (18) soient fermés lorsque la partie piston portant le filtre se trouve entre les deux parties du carter.
EP97945653A 1996-11-19 1997-11-18 Dispositif pour filtrer un fluide Withdrawn EP0892663A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT0201896A AT404800B (de) 1996-11-19 1996-11-19 Vorrichtung zum filtrieren eines fluids
AT2018/96 1996-11-19
PCT/AT1997/000249 WO1998022198A1 (fr) 1996-11-19 1997-11-18 Dispositif pour filtrer un fluide

Publications (1)

Publication Number Publication Date
EP0892663A1 true EP0892663A1 (fr) 1999-01-27

Family

ID=3526041

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97945653A Withdrawn EP0892663A1 (fr) 1996-11-19 1997-11-18 Dispositif pour filtrer un fluide

Country Status (4)

Country Link
EP (1) EP0892663A1 (fr)
AT (1) AT404800B (fr)
AU (1) AU5109698A (fr)
WO (1) WO1998022198A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT404561B (de) * 1997-03-17 1998-12-28 Chemiefaser Lenzing Ag Vorrichtung zum filtrieren eines verunreinigten fluids
DE102012100641A1 (de) * 2011-07-29 2013-01-31 Kreyenborg Verwaltungen Und Beteiligungen Gmbh & Co. Kg Filtriervorrichtung zur Großflächenfiltration von Fluiden
ES2555551T3 (es) 2012-12-06 2016-01-04 Aurotec Gmbh Procedimiento y dispositivo para la limpieza de un fluido

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4025434A (en) * 1975-10-06 1977-05-24 Bolton-Emerson, Inc. Screen changer with pre-fill screen blocks
EP0250695B1 (fr) * 1986-06-06 1990-04-04 EREMA Engineering-Recycling-Maschinen-Anlagen Gesellschaft m.b.H. Filtre
DE3941831C1 (fr) * 1989-12-19 1990-10-18 Kreyenborg Verwaltungen Und Beteiligungen Kg, 4400 Muenster, De
DE4420119C1 (de) * 1994-05-03 1995-06-29 Kreyenborg Verwaltungen Filtereinrichtung für Strangpressen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9822198A1 *

Also Published As

Publication number Publication date
AU5109698A (en) 1998-06-10
AT404800B (de) 1999-02-25
ATA201896A (de) 1998-07-15
WO1998022198A1 (fr) 1998-05-28

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