WO2007096909A1 - Filtre / secheur - Google Patents

Filtre / secheur Download PDF

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Publication number
WO2007096909A1
WO2007096909A1 PCT/IT2006/000094 IT2006000094W WO2007096909A1 WO 2007096909 A1 WO2007096909 A1 WO 2007096909A1 IT 2006000094 W IT2006000094 W IT 2006000094W WO 2007096909 A1 WO2007096909 A1 WO 2007096909A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
dryer
collection chamber
fluid
disposed
Prior art date
Application number
PCT/IT2006/000094
Other languages
English (en)
Inventor
Roberto Verri
Original Assignee
Comber S.R.L.
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 Comber S.R.L. filed Critical Comber S.R.L.
Priority to PCT/IT2006/000094 priority Critical patent/WO2007096909A1/fr
Publication of WO2007096909A1 publication Critical patent/WO2007096909A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/16—Cleaning-out devices, e.g. for removing the cake from the filter casing or for evacuating the last remnants of liquid
    • 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
    • B01D29/01—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 flat 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
    • B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
    • B01D29/6469—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers
    • B01D29/6476—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers with a rotary movement with respect to the filtering 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
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
    • 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
    • B01D29/76—Handling the filter cake in the filter for purposes other than for regenerating
    • B01D29/80—Handling the filter cake in the filter for purposes other than for regenerating for drying
    • B01D29/84—Handling the filter cake in the filter for purposes other than for regenerating for drying by gases or by heating
    • B01D29/843—Handling the filter cake in the filter for purposes other than for regenerating for drying by gases or by heating by direct contact with a fluid

Definitions

  • the present invention relates to a unit for filtration under pressure and/or drying, otherwise known as a filter/dryer, particularly for chemico-pharmaceutical products, of the type comprising a main body internally forming a collection chamber adapted internally to collect a quantity of product to be dried, a filter baffle adapted to filter the product to be dried and having a surface facing the collection chamber and first fluid supply means adapted to supply a fluid to the collection chamber.
  • the present invention also relates to a filter baffle for a filter/dryer and to a filtration/drying method.
  • a unit of this type is known, for instance, from US Patent Specification 5 564 350, in the name of Peplinski.
  • the dry residue Since the final result of the processes in which they are used, the dry residue, has a high added value, it is therefore particularly important to keep the content of the batch as homogeneous as possible and to reduce to a minimum any contamination between one batch and the following one.
  • the semi-liquid mixture generally containing up to 40% of solvent supplied to the filter/dryer is agitated, filtered under pressure and vacuum dried by heating means.
  • gas for instance dry air or nitrogen
  • this gas exerts a pressure on the mass to be filtered and urges it toward the filter baffle, thus adding a further force to the pressure of a mechanical type brought about by the action of the agitator blades.
  • the agitator is actuated both in rotation and with an alternating ascending/descending movement along its axis so as to ensure that the product mass is constantly being mixed. Drying is generally assisted by the heating of the collection chamber, or by causing steam or another heating fluid to pass through appropriate external jackets.
  • the output duct for the dry product is opened and the dry product is urged towards this duct by the mechanical action of the agitator.
  • the arms of the agitator In order to prevent the arms of the agitator from damaging the filter baffle by sliding thereon, there is always play, normally of a few millimetres, between them.
  • this heel means that the properties of the finished product removed by the action of the agitator are not comparable with the finished product forming the heel.
  • the heel is removed by connecting an apparatus to the dryer which makes it possible for an operator to break up and manually remove the heel, while at the same time maintaining the required sterile conditions; this process is nevertheless very time-consuming and the apparatus required is expensive. It does not, moreover, make it possible to increase the homogeneity of the batch as it merely recovers the finished product forming the heel, but does not — and could not - prevent its formation.
  • the filter/dryer disclosed in the Peplinski patent has a bell-shaped collection chamber, a circular filter baffle disposed in the lower part of the collection chamber, an agitator disposed along the longitudinal axis of the collection chamber, a supply duct for the product to be filtered and/or dried and an output duct for the dry product.
  • the unit disclosed in the Peplinski patent blows nitrogen onto the heel directly from the agitator blades; since the heel is borne by the filter baffle, the emission of gas from the agitator blades is not very efficient.
  • the object of the present invention is to provide a filter/dryer, a filter baffle and a filtration/drying method which provides the finished product with a homogeneity greater than that obtained up to now, overcoming the problems encountered in the prior art.
  • Fig. 1 is a perspective view, partly in section, of a filter/dryer according to a preferred embodiment
  • Fig. 2 is a view, partly in section, of the filter/dryer of Fig. 1;
  • Fig. 3 is a partial perspective view of a detail of the filter/dryer of Fig. 1;
  • Figs. 4 and 5 are perspective views, partly in section, of the filter/dryer of Fig. 1 in a sequence of operating instants during the stage of breaking up of the dry heel.
  • Fig. 1 shows a filter/dryer 1 , comprising a collection chamber 2 of circular section, which is pressure and vacuum resistant, closed by a cover 4 which is generally dished and by a base with a filter baffle 5 which is generally plane.
  • the collection chamber 2 as shown extends along a longitudinal axis X-X which, when the device 1 is installed, is disposed in a vertical direction.
  • the filter/dryer 1 comprises a charging opening 6 for the product to be filtered and dried, a discharge opening 7 for the dry powder filtrate and a discharge opening 8 for the removed liquid solvent, all provided in a known manner with means controlling their opening and closing. It may also comprise pressurised gas supply means (not shown) for the rapid supply, in a known manner, of a quantity of drying gas, air or nitrogen, sufficient to bring the collection chamber 2 to the correct operating pressure in a relatively fast period of time.
  • a filter baffle 5 is borne by a structure 10 and operationally divides the collection chamber 2 from a lower portion 12 provided with mains connections 13.
  • the collection chamber 2 contains an agitator 14 which comprises a shaft 16 disposed along an axis generally coincident with the longitudinal axis X-X of the collection chamber 2 and a certain number of radial arms 15, generally two, rigid with the shaft 16.
  • a jacket 17 adapted to maintain the collection chamber 2 at the desired temperature is shown diagrammatically about the collection chamber 2.
  • the fluid in question is a gas, preferably inert, for instance air, dry air or nitrogen.
  • the collection chamber 2 is bounded at least partly by a reference surface ⁇ , which is substantially defined by the surface of the filter baffle 5 facing this collection chamber 2.
  • the agitator 14 may be moved in rotation in both the clockwise and anticlockwise directions and may possibly also be moved in translation towards the lower portion 12 or towards the upper cover 4 of the filter/dryer 1 as shown in Figs. 1 and 2 by the arrow V.
  • the agitator 14 has its own working volume within the collection chamber 2 which is substantially coincident with its central zone; there are nevertheless two zones of the collection chamber 2 which may not be reached by the action of the arms 15 of the agitator 14: an upper and a lower zone; the latter, in particular, prevents any damage to the filter baffle 5.
  • the filter/dryer 1 comprises first supply means 18 for the supply of a fluid, disposed in the lower zone of the filter/dryer 1 and more particularly on the side of the reference plane ⁇ opposite the collection chamber 2; they are also disposed so that the path of the conveyor fluid towards the collection chamber 2 passes through the reference plane ⁇ .
  • This arrangement has the advantageous effect that the product disposed in the vicinity of the filter baffle 5, and therefore also the heel 20 of dry residue, is provided with a force which, as it is not opposed by any support, generates a lifting action urging the product into the working volume of the agitator.
  • the fluid path comprises one or more fluid branches ending in one or a plurality of respective openings 21, for instance calibrated holes or nozzles, disposed on the side of the reference plane ⁇ opposite the collection chamber 2 and oriented such that the conveyor fluid is supplied to the collection chamber 2 by passing though the reference plane ⁇ .
  • the openings 21 may be disposed along at least one of the radial directions with respect to the longitudinal axis X-X of the main body 3, and are preferably disposed in one or more arms 11 which form, overall, a radiate structure 10.
  • This structure 10 comprises a certain number of hollow arms 11, for instance eight, twelve, sixteen or twenty, preferably equally angularly spaced, so as to define therein at least part of the fluid path branches.
  • the number of arms 11 may be selected such that the distance between the outermost openings 21 of two adjacent arms 11 is approximately 30-40 centimetres.
  • the localised supply of fluid through the surface ⁇ manages locally to lift the heel 20 in a zone, called the effective zone, solely around this opening 21.
  • the radiate structure 10, with the openings 21 disposed along the arms 11, makes it possible to distribute the effective zones of the openings 21 in a substantially uniform manner and thus makes it possible substantially completely to break up the heel 20.
  • the fluid path branches may be provided with valve control means (not shown), for instance automatic three-way valves actuated by solenoids able selectively to open and/or close them.
  • valve means are able to open the fluid branches, acting upstream of the fluid branches or directly on the openings 21 , so that they emit pulses of fluid having a duration of some tenths of a second.
  • Figs. 4 and 5 show a graphical representation of the breaking-up effect: Fig. 4 shows how the heel 20, subject to the lifting action of the gas emitted from the openings 21 disposed along one of the arms 11 of the structure 10 which makes up the lower supply means 18, is in practice lifted slightly before the arm 15 of the agitator 14, rotating in an anticlockwise direction, urges it forward and breaks it up.
  • Fig. 5 which shows a subsequent instant, the arm 15 of the agitator 14 has been displaced by a certain angle and the arm 11 of the gas emission structure 10 which is operational is the adjacent arm in the direction of rotation of the agitator 14. As before, the heel 20 is lifted and brought into the working volume of the agitator
  • the operating pressures are approximately 6-8 bar; since the filter baffle 5 is interposed between the radiate structure 10 and the collection chamber 2, it must be able to withstand the fluid pulses emitted by the fluid supply means 18.
  • the filter baffle 5 is generally composed of one or a plurality of drilled drainage plates on which one or a plurality of actual multi-layer filter webs are disposed.
  • the multi-layer webs are metal webs generally formed by three to seven layers, preferably sintered with one another.
  • the first and third layers are protective and the second defines the porosity of the means (for instance 20 micrometers), and the fourth and fifth layers are support layers adapted to provide it with the necessary resistance.
  • the filter baffle 5 has a section such that it coincides substantially with the section of the collection chamber 2 in which it is disposed. This surface is generally circular.
  • the filter baffle 5 In order for the filter baffle 5 to be able to withstand the counter-pressures generated by the fluid supply means 18 described above, it is advantageous to divide the filter baffle 5 into a plurality of segments 9.
  • the number of circular segments 9 is, for instance, equal to the number of arms 11 of the support structure 10; the segments 9 preferably all have the same angular extension.
  • the filter baffle 5 protects the openings 21 against the entry of dry powder residue.
  • the filter/dryer 1 further comprises control means to control the opening of the fluid path branches in relation to the rotation of the agitator 14 or in relation to its position and/or its angular speed.
  • control means for instance driven by PLC, are programmed to open the fluid path branches when the arm 15 of the agitator 14 is in the vicinity of these fluid branches.
  • the angular distance is such as to provide for the breaking-up effect discussed above; the precise angular and/or time offset values depend, inter alia, on the density, thickness and mechanical strength of the heel.
  • Zones such as the upper side of the arms 15, the bellows structure which covers the shaft 16 of the agitator 14 and the junctions between the segments 9 of the filter baffle 5 are in practice untouched zones which cannot be reached by the action of the fluid supply means 18.
  • the filter/dryer of the present invention may further comprise upper fluid supply means 19 connected to the upper portion of the main body 2, for instance connected to the cover 4, and able to supply fluid in at least one direction which may be varied over time, by rotation about at least two axes Y-Y and Z-Z inclined with respect to one another.
  • the fluid supplied by these supply means 19 may be the same type of fluid supplied by the lower fluid supply means 18.
  • the upper means 19 comprise one or a plurality of devices 23, an embodiment of which is shown in Fig. 3, each provided with a main body 24 comprising a first elongate portion 25 extending along a first rectilinear axis Y-Y and a second portion 26, connected to the first portion 25, which has a free end; in this way, the second portion 26 defines a second axis Z-Z at an angle with respect to the first axis Y-Y.
  • the first axis Y-Y may be disposed parallel to the longitudinal axis X-X of the collection chamber 2, as shown in Figs. 1 and 2, or, more advantageously, perpendicular to the cover 4, or with an inclination with respect to the axis X-X of some 20°-30° to dispose the free end of the second portion 26 in a more central manner with respect to the wall of the main body 3.
  • Fig. 3 shows a cone of the possible orientations of the first axis Y-Y of the device 23 with respect to an axis parallel to the longitudinal axis X-X of the collection chamber 2.
  • first portion 25 and the second portion 26 define the sides of the angle comprised between them, it may be considered that the angle has an aperture of between 45° and 135°, preferably between 60° and 120°, with an optimum value of some 90°.
  • a rotary support 27 is provided on the free end of the second portion and is able to rotate about the second axis Z-Z.
  • This rotary support 27 comprises one or a plurality of nozzles 28, possibly equally angularly spaced so as to balance the forces resulting from the emission of fluid.
  • the devices 23 comprise motor means adapted to rotate the main body 24 about the first axis Y-Y, preferably using at least part of the fluid itself.
  • the nozzles 28 may be disposed on the outer circumference of the rotary support 27, about the axis of rotation and with their openings facing in the peripheral direction with respect to the second axis Z-Z, as shown in Fig. 3. In this way, the rotary support 27 is caused to rotate about the second axis Z-Z simply by the supply of fluid.
  • the openings of the nozzles 28 are oriented in the radial direction, towards the exterior of the rotary support 27; in this alternative arrangement, separate motor means may be needed to cause the rotary support 27 to rotate about the second axis Z-Z.
  • the devices 23 which form these fluid supply means 19 are preferably fixed in the direction of the first axis Y-Y in order to facilitate stability at the point at which they supply the collection chamber 2. These devices 23 are disposed so as not to interfere with the working volume of the agitator 15 during its working operations.
  • liquids possess lubricating properties which are generally better than those of gases the friction between the rotary support 27 and the second portion 26 of the main body 24 is generally lower when liquid is supplied than when gas is supplied.
  • the liquid supply means 19b may not necessarily, therefore, require separate motor means for the rotation of the rotary support 27 about the second axis Z-Z.
  • the agitator 14 is actuated, possibly at the same time as the lower and/or upper fluid supply means 18 and 19.
  • the agitator 14 is caused to rotate about its longitudinal axis X-X and/or is moved in translation along this axis.
  • the first fluid supply means 18 may also be actuated only partially: in this case, at any given instant, only some (one or more) of the fluid path branches are active and supply fluid to the collection chamber 2, while the remainder are inactive; the active branches change, moreover, over time.
  • the openings 21 disposed along the same radius are preferably actuated in sequence in one of the two directions of rotation, possibly in a manner synchronised with the direction of rotation of the arms 15 of the agitator 14.
  • the fluid is supplied for a very short period, immediately before the arms 15 of the agitator 14 are superimposed on the fluid outlet openings 21, or with an advance, for instance of between approximately 20° and approximately 40°.
  • the upper fluid supply means 19 may be actuated during the filtration and/or drying operations, but it is more advantageous to actuate them during the successive operations to dry clean the collection chamber 2 to remove the dry powder residue.
  • the washing cycle may be carried out, for instance, before a different product is placed in the collection chamber 2 (or at the end of each cycle) and makes it possible further to reduce the risk of contamination between two different products without the need for long and costly operations normally carried out manually with long machine down times.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

La présente invention concerne un filtre / sécheur (1) comportant un corps (3) principal définissant intérieurement une chambre (2) de collecte délimitée au moins en partie par une surface (α) de référence elle-même sensiblement définie par la surface d'une chicane (5) de filtration faisant face à la chambre (2) de collecte, un premier moyen (18) d'alimentation en fluide destiné à amener un fluide jusqu'à la chambre de collecte, disposé du côté du plan (α) de référence opposé la chambre de collecte et disposé en outre de telle sorte que le trajet du fluide jusqu'à la chambre (2) de collecte traverse le plan (α) de référence. La présente invention concerne en outre un procédé d'exploitation du filtre / sécheur (1) dans lequel les branches du trajet de fluide sont actionnées individuellement, en séquence et en coordination avec la rotation de l'agitateur (14) et d'une chicane (5) de filtration du filtre / sécheur (1) présentant deux côtés convergents, de sorte qu'elle présente une forme segmentée.
PCT/IT2006/000094 2006-02-22 2006-02-22 Filtre / secheur WO2007096909A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IT2006/000094 WO2007096909A1 (fr) 2006-02-22 2006-02-22 Filtre / secheur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2006/000094 WO2007096909A1 (fr) 2006-02-22 2006-02-22 Filtre / secheur

Publications (1)

Publication Number Publication Date
WO2007096909A1 true WO2007096909A1 (fr) 2007-08-30

Family

ID=36940127

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT2006/000094 WO2007096909A1 (fr) 2006-02-22 2006-02-22 Filtre / secheur

Country Status (1)

Country Link
WO (1) WO2007096909A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103206850A (zh) * 2013-02-04 2013-07-17 浙江诚信医化设备有限公司 一种多功能过滤干燥机中的滤板组件
JP2015100743A (ja) * 2013-11-25 2015-06-04 株式会社流機エンジニアリング 濾過方法及びその装置
IT201700111978A1 (it) * 2017-10-05 2019-04-05 Eurofilter S R L Dispositivo filtrante
CN111603820A (zh) * 2020-06-09 2020-09-01 浙江鑫汇达环保科技有限公司 一种原木切割生产用污水处理设备
CN111617530A (zh) * 2020-06-09 2020-09-04 浙江鑫汇达环保科技有限公司 一种可移动式抗震原木切割生产用污水处理设备

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2158365A (en) * 1985-05-09 1985-11-13 Littleford Bros Inc Combined mixing, reacting, drying and filtering device
EP0302448A2 (fr) * 1987-08-04 1989-02-08 Seitz Enzinger Noll Maschinenbau Aktiengesellschaft Procédé de nettoyage des solvants et dispositif pour effectuer ce procédé
WO2001076781A1 (fr) * 2000-04-06 2001-10-18 Toftejorg A/S Equipement destine au nettoyage de reservoirs
EP1270097A2 (fr) * 2001-06-27 2003-01-02 3V Cogeim S.P.A. Unité de vidange pour récupérer un résidu, en particulier dans des filtres de séchage, des unités de séchage, et similaires
US20050096447A1 (en) * 2003-10-30 2005-05-05 Maruzen Petrochemical Co., Ltd. Production process of copolymer for semiconductor lithography

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2158365A (en) * 1985-05-09 1985-11-13 Littleford Bros Inc Combined mixing, reacting, drying and filtering device
EP0302448A2 (fr) * 1987-08-04 1989-02-08 Seitz Enzinger Noll Maschinenbau Aktiengesellschaft Procédé de nettoyage des solvants et dispositif pour effectuer ce procédé
WO2001076781A1 (fr) * 2000-04-06 2001-10-18 Toftejorg A/S Equipement destine au nettoyage de reservoirs
EP1270097A2 (fr) * 2001-06-27 2003-01-02 3V Cogeim S.P.A. Unité de vidange pour récupérer un résidu, en particulier dans des filtres de séchage, des unités de séchage, et similaires
US20050096447A1 (en) * 2003-10-30 2005-05-05 Maruzen Petrochemical Co., Ltd. Production process of copolymer for semiconductor lithography

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103206850A (zh) * 2013-02-04 2013-07-17 浙江诚信医化设备有限公司 一种多功能过滤干燥机中的滤板组件
JP2015100743A (ja) * 2013-11-25 2015-06-04 株式会社流機エンジニアリング 濾過方法及びその装置
IT201700111978A1 (it) * 2017-10-05 2019-04-05 Eurofilter S R L Dispositivo filtrante
CN111603820A (zh) * 2020-06-09 2020-09-01 浙江鑫汇达环保科技有限公司 一种原木切割生产用污水处理设备
CN111617530A (zh) * 2020-06-09 2020-09-04 浙江鑫汇达环保科技有限公司 一种可移动式抗震原木切割生产用污水处理设备

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