WO1982001665A1 - Appareil de separation de particules solides essentiellement pour des applications exigeant une plus grande securite de fonctionnement - Google Patents

Appareil de separation de particules solides essentiellement pour des applications exigeant une plus grande securite de fonctionnement Download PDF

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Publication number
WO1982001665A1
WO1982001665A1 PCT/HU1981/000044 HU8100044W WO8201665A1 WO 1982001665 A1 WO1982001665 A1 WO 1982001665A1 HU 8100044 W HU8100044 W HU 8100044W WO 8201665 A1 WO8201665 A1 WO 8201665A1
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WO
WIPO (PCT)
Prior art keywords
filter
filter element
space
solid particles
primary
Prior art date
Application number
PCT/HU1981/000044
Other languages
English (en)
Inventor
Gyogyszervegyeszeti Gyar Egypt
Tamas Zagon
Miklos Karpati
Istvan A Pattantyus
Jeno Szemmelroth
Original Assignee
Egyt Gyogyszervegyeszeti Gyar
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 Egyt Gyogyszervegyeszeti Gyar filed Critical Egyt Gyogyszervegyeszeti Gyar
Priority to NL8120441A priority Critical patent/NL8120441A/nl
Priority to DE19813152523 priority patent/DE3152523A1/de
Publication of WO1982001665A1 publication Critical patent/WO1982001665A1/fr
Priority to FI821981A priority patent/FI821981A0/fi
Priority to DK283082A priority patent/DK283082A/da

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0084—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours provided with safety means
    • B01D46/0091—Including arrangements for environmental or personal protection
    • B01D46/0094—Including arrangements for environmental or personal protection against radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/42—Auxiliary equipment or operation thereof
    • B01D46/44—Auxiliary equipment or operation thereof controlling filtration
    • B01D46/446—Auxiliary equipment or operation thereof controlling filtration by pressure measuring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
    • B01D46/62—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in series
    • B01D46/64—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in series arranged concentrically or coaxially

Definitions

  • the invention belates to an apparatus for the separation of solid particles, which by its structural design can be operated with high reliability its filtering capacity during operation can be followed with attention in a simple way and it can be used equally for the separation from liquids and gaseous medium, mainly in the fields requiring increased operational safety, thus for instance in the field of the pharmaceutical industry, organic chemical industry and even in the field of the neuclrar industry, etc.
  • Filter apparatuses are generally used for the separation of solid particles, seberal varieties of which are known. Irrespective of the fact, that the product to be separated or purified is in solid, gaseous or liquid state, the general construction of the apparatuses is characterized by beingprovided with a primary space for the joint reception of medium and solid particles, with a secondary space for the collection of filtered or purified medium, and for the transfer therefrom and these two spaces are in intercommunication through a filter.
  • the solid particles while flowing through the filter fed in together with the medium, or those entrained by the flowing medium are separated from the medium fed into the primary space under pressure, they are deposited on the filter surface at the primary space side, and depending on their material they are accumulating in the lower half of the primary space, the medium flowing through the filter is collected in the secondary space, then passes out of the apparatus.
  • Breakdown of the filter will entail stopping the operation of the apparatus, its cutout from the technological process, its disassembly to the necessary extent, detection and repair of the faulty filter, or replacement of the filter material, at the same time it entails shortfall in the production and/or loss of product during the time between the occurrence and detection of the fault and stopping the operation of the apparatus, thereby causing damage and/or pollution of the environment.
  • filter breakdown at intermittent production the filter may become polluted, which necessitates the repeated filtering of the charge.
  • Such mechanical devices maybe fork-, or stripper ring-type loosening devices, or those with knife as recommended for gas filters in the Hungarian patent specification No. 171 278, which remove the separated material from the filter surface by movement of the applied strippers on the filter surface at the simultaneous deformation of of the filter in case of certain solutions.
  • Another group of the mechanical devices used mainly in case of bag, hose or pouch-type filters is represented by vibrators, such as used in the solution described in the GFR patent specification No. 1 607 722.
  • the vibrators move the filter mainly in the direction of the longitudinal centreline and thereby the separated material is thrown off the filter surface.
  • Main disadvantage is the wear of the filter material, which reduces its life, and breakdown is more frequent.
  • the vibration is effective only on a certain part of the filter, the separated material is deposited in the vicinity of the filter setting, and they can be removed only after disassembly of the apparatus.
  • the mechanical devices are generally arranged in the primary space receiving the medium to be filtered, which entails increased wear and frequent breakdown and their repair can be generally carried out by disassembly of the apparatus. Further disadvantage is, that as mechanical devices they require constant maintenance and are relatively costly.
  • Such silutions are also known, as for instance the one recommended in the English patent specification N o . 1 133 590, where the condition of the filter material is watched with particle sensor placed into the flow of the filtered medium, or the solution recommended in the English patent specification No. 1 281 588, where the leakageproof condition of the air filter insert is inferred from the differential pressures measured before and after, and the necessity of changing the filter insert arises upon reaching a given differential pressure.
  • Common disadvantage of the described solutions is, that although they reduce the danger of clogging to a lesser or higher degree, they can not prevent breakdown of the filter material, on the contrary its danger is even increased by the use of certain solutions.
  • Elimination of the filter clogging or breakdown requires cutout of the operation of the apparatus entailing loss in production, while during the interval between occurrence and detection of the fault and stopping the apparatus, loss of product may occur representing considerable financial value and/or environmental pollution, or the more costly refiltering of the filtrate may also become necessary. At the same time elimination of the fault necessitates finding the defective filter which generally requires long work, followed with repair of the apparatus.
  • Realization of the apparatus was aimed at such construction as to establish the fact and location of the breakdown simultaneously with its occurrence without disassembly of the apparatus and without outside intervention.
  • the invention is based on the recognition, that the mentioned disadvantages and deficiencies can be eliminated by such construction of the apparatus, where the filter is individually formed suitably by a filter member assembled as a single unit, provided with a primary filter surface and with a safety secondary filter surface activating the primary filter surface in case of breakdown, and it is provided with a device furnishing continuous information on the filtering capacity of any filter surface of the filter member during operation.
  • the apparatus for the separation of solid particles according to the invention is suitable mainly for meeting the demands requiring increased operational safety, and it is formed with a primary space for receiving solid particles and medium, in given case for carrier medium and with a secondary space for the collection of filtered medium separated from each other by a filter member.
  • the filter member has a first filter element and a second filter element, the first filter element is arranged to confine the primary space, the second filter element is arranged to confine the secondary space, the first and second filter elements together with the primary space only through the adjoining first filter element and with the secondary space only through the adjoining second filter element form an intercommunicating intermediate space, and an internal pressure sensor is arranged in the intermediate space.
  • a preferable construction of the apparatus according to the invention has a first differential pressure gauge indicating the differential pressure in the primary space and intermediate space.
  • a further preferable construction of the appa- ratus according to the invention has a second differential pressure gauge indicating the differential pressure in the secondary space and intermediate space.
  • the solid particles are separated from the medium flowing through the filter member on the surface of the first filter element adjoining the primary space, as on the primary filter surface of the filter member.
  • the solid particles clog the apertures of the filter, material, thus the permeability of the first filter member is reduced and thereby the differential pressure increases in inverse proportion in the primary space and intermediate s pace .
  • This differential pressure is indicated by the first differential pressure gauge and it is in proportion with the permeability of the first filter element within certain limits.
  • Permeability of the second filter element is practically constant, the pressure, which is the difference between the pressures in the intermediate space and secondary space, is constant only according to the quantity of medium flowing through.
  • the first filter element that becomes decfective in the first place, in this case separation of the solid particles continues on the surface of the second filter element adjoining the intermediate space, as on the second filter surface of the filter member, thus the normal operation of the apparatus can be continuously maintained without any undesirable consequences.
  • the pressure increases in the intermediate space, and it approaches or equals the pressure in the primary space. This is indicated by the first differrntial pressure gauge, and thereby breakdown of the first filter element can also be sensed.
  • Operation of the second filter element can be similaryl followed with attention by the pressure values indicated on the second differential pressure gauge.
  • the apparatus according to the invention may also be constructed in such a way, that within the housing of the apparatus several parallel operating filter members are arranged.
  • the filter members are arranged by fitting into openings formed on the wall between the primary and secondary spaces, by fastening on frame, or in any other conventional way.
  • it is suitable to arrange pressure sensors in the intermediate space within each filter member, the pressure data obtainable from the primary and secondary spaces will give separate information on the condition of the primary and secondary filter surfaces of each filter member.
  • the solution according to the invention is suitable for the construction of such apparatus, where within a filter member and in addition to the first filter element adjoining the primary space further filter element(s) is/are arranged dividing the intermediate space into two or more smaller closed s paces . This way the operational safety of the apparatus will be increased.
  • the construction, shape and fastening method of the filter members are indifferent.
  • the solution of the filter elements is generally conventional, suitably formed as bag-, hose, or pouch, or stretched flat, mounted on frame, the filter fabric of natural, synthetic, possibly of metal, textile material, etc. pulled over an insert, with a build-up most suitable to the demands and purposes, with the use of spacer and fixing method.
  • the filter member may be mounted as a single unit, but its filter members are separately replaceable.
  • Such filter members may be used to advantage, where the first filter element and/or the second filter element is bag, hose or pouch.
  • the bag, hose or pouch-type first filter element and the same shaped second filter element are arranged opposite each other, opening into each other and are connected to each other along the edges of their openings by sealing off the intermediate space.
  • hose or pouch-shaped filter element of the filter member is reaching into the interior, while - opening in the same direction - another smaller filter element of similar shape is arranged and they are connected to each other along the dge of their openings by sealing off the intermediate space.
  • hose or pouch-shaped filter element of the filter member another flat filter is arranged covering the former one , and the two filter elements are connected to each other by sealing off the intermediate space.
  • the type and system of the pressure sensor arranged in the intermediate space are determined by the application conditions and safety technical specifications. Usually pneumatic sensors, U-tube pressure gauges, hydraulic pressure sensors, or their alternatives combined with electronic sign converters are applicable. The differential pressure sensors and gauges conform to the type and system of the sensors.
  • the apparatus according to the invention may be used as an independent filter apparatus for individual applications, or it may be associated with devices of other functions, such as built together with drier, for the separation from pneumatic medium it may serve as fluidization drier, or built together with cyclone as filter cyclone, etc., and in case of separation from liquid medium it may be complemented with devices suitable for carrying out chemical industrial operations requiring simultaneous filtering.
  • the main advantage of the apparatus according to the invention is, that it gives continuous information on the condition of its filter surface and thus on the momentary filtering capacity during operation of the apparatus. Should any of its falter elements break down, the fact of breakdown will be instantly indicated and at the same time on the basis of the received informations the defective filter element can be identified without disassembly of the apparatus, which makes it much easier, especially in case of several filter members and/or at multi-functional apparatus.
  • the possibility of breakdown exists mainly in the first filter element, which in the construction according to the invention has no direct effect on the operation of the apparatus. Function of the first filter element, i.e. the separation is taken over simultaneously with the breakdown by the second filter element, thus continuity of the operation of the apparatus can be maintained. This gives the possibility for carrying out the elimination of the fault in a technologically more opportune point of time.
  • Figure 1. Block diagram showing the cross section of a fluidization drier.
  • Figure 2. a. Cross section of a possible alternative of the filter member arranged in a fluidization drier.
  • Figure 2.b. Cross section of another possible contruction of the filter member arranged in a fluidization drier.
  • the main parts of the fluidization drier 10 shown in Figure 1 are house 13,15, orifices 17, and filter member 12.
  • the filter member 12 is fixed to flange or partition wall in the interior of house 11, and it divides the interior of house 11 primary - powdery substance - space 14 and secondary purified medium - space 16. Inlet opening. 13 and charging orifice 17 are leading into the secondary space 16.
  • Filter member 12 has bag, hose or pouchshaped first filter element 21 and the same shaped secind filter element 22, which together form the intermediate space 18.
  • the intermediate space 18 is separated from the primary space by the second filter element 22 and communication with the intermediate space 18 is possible only through the corresponding adjoining filter element, and communication between the primary space 14 and secondary space 16 is possible only through the intermediate space 18.
  • the first filter element 21 and second filter element 22 are arranged opposite each other, leading into each other, and are interconnected along the edge of their openings by sealing off the intermediate space 18.
  • Drier mixer 50 is built into the primary space of housing 11 of the fluidization drier 10.
  • First pressure sensor 31 is arranged in the primary space 14, second pressure sensor 32 in the secondary space 16, while the internal pressure sensor 30 is arranged In the intermediate space 18.
  • the first pressure sensor 31 with the first outlet of the intermediate pressure sensor 30 is connected to the first differential pressure gauge 41, while the second pressure sensor 32 with the second outlet of the intermediate pressure sensor 30 is connected to the second differential pressure gauge 42.
  • the wet powdery substance to be dried is admitted through the charging orifice 17, while the pressurized drying pneumatic medium is admitted through the inlet opening 13 into the primary - powdery substance - space 14.
  • the flowing pneumaticmedium dries the wet powdery substance by floating in the primary space 14.
  • the solid particles entrained by the pneumatic medium flowing from the primary space 14 through filter member 12 are separated on the outer surface of the adjoining first filter element 21 as on the primary filter surface of the filter member 12 and are accumulating partly on this filter surface, and partly falling off into the lower space of the housing 11.
  • the medium flowing through the first filter element 21 passes into the intermediate space 18, therefrom through the second filter element 22 into the secondary - purified medium - space 16, leaving it through the outlet opening 15.
  • Drying of the solid particles filtered from the medium and accumulating in the lower space of housing 11 is facilitated by the mixer 50 arranged therein.
  • Th ⁇ differential pressure ⁇ p a of these two pressures can be sensed and measured with the first differential pressure gauge 41.
  • the differential pressure ⁇ p b i.e. the pressure between the intermediate space 18 and secondary space 16 depends mainly on the quantity of medium passing through the second filter element 22 during the unit of time, aid can be sensed and measured with the second differential pressure gauge 42.
  • each first filter element 21 can be directly sensed by comparison of the differential pressure valus ⁇ p a .
  • the indicator system for watching the differential pressure values ⁇ p a simplifies and lowers the cost of automated instrument-controlled technological process.
  • Figure 2 illustrates some of the possible preferable constructions of the filter members applicable In the apparatus.
  • FIG. 2 The alternative shown in Figure 2. a. in one of the bag, hose or pouch-shaped filter elements 23 of filter member 12 another smaller filter element 24 of similar shape opening in the same direction is arranged.
  • the intermediate space 18 is confined by the filter element surfaces looking towards each other, i.e. by the inner surface of the of the outer filter element 23 and the outer surface, of the other inner filter surface 24.
  • the filter elements are interconnected along the e dge of their openings by sealing off the intermediate space 18.
  • the primary and secondary filter surfaces of the filter member 12 are determined by the existing flow direction during operation.
  • the filter elements can be fixed separately on suitable supporting structures, or into filter member holding fixture 25 mounted as a single unit as shown in the diagram, or in given case they can be fixed to each other with the use of suitable fixtures and only one of them or the fixture to suitable holder. This fixing is solved in such a way, that any of the filter elements and even the filter member 12 are replaceable in a simple way.
  • hose or pouch-shaped filter elements 23 is arranged covering the former one.
  • the intermediate space 18 is practically the interior of one of the filter elements 23, limited by the surface of the flat filter element 27 facing the former filter element.
  • the two filter elements are connected to each other by sealing off the intermediate space 18.
  • the primary and secondary filter surfaces of filter member 12 are determined by the existing flow direction during operation.
  • the filter elements can be fixed separately to suitable holders, or fixed to holding fixture 28 mounted as a single unit as shown in Figure 2.b., or the filter elements can be fixed to each other with the use of fixture or fastening device as necessary, and by fastening one of them to flange, or partition wall.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Filtering Materials (AREA)

Abstract

Appareil de separation de particules solides qui, par la conception de sa structure, peut fonctionner avec une grande fiabilite et sa capacite de filtration pendant son fonctionnement peut etre suivie avec attention de maniere simple et il peut etre egalement utilise pour la separation de liquides et de milieux gazeux, essentiellement dans des domaines exigeant une grande securite de fonctionnement, par exemple dans l'industrie pharmaceutique, dans l'industrie de la chimie organique et meme dans le domaine de l'industrie nucleaire, etc. L'appareil de separation de particules solides est approprie essentiellement pour satisfaire les besoins d'une grande securite de fonctionnement, et il est forme avec un espace primaire de reception des particules solides et du milieu, par exemple le milieu porteur, et avec un espace secondaire pour la recuperation du milieu filtre separe l'un de l'autre par un organe filtre. Essentiellement, l'organe filtre possede un premier element filtre et un second element filtre, le premier element filtre etant concu pour etre contenu dans le premier espace, le second element filtre etant concu pour etre contenu dans le second espace, le premier et le second elements filtres formant ensemble, avec le premier espace seulement au travers du premier element filtre contigu et avec le second espace seulement au travers du second element filtre contigu, un espace intermediaire d'intercommunication, un detecteur de pression interne etant monte dans l'espace intermediaire.
PCT/HU1981/000044 1980-11-11 1981-11-11 Appareil de separation de particules solides essentiellement pour des applications exigeant une plus grande securite de fonctionnement WO1982001665A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
NL8120441A NL8120441A (nl) 1980-11-11 1981-11-11 Inrichting voor de scheiding van vaste-stofdeeltjes, in hoofdzaak voor toepassingen welke een verhoogde bedrijfzekerheid vereisen.
DE19813152523 DE3152523A1 (de) 1980-11-11 1981-11-11 Einrichtung zum abschneiden von feststoffteilchen, insbesondere fuer erhoehte betriebssicherheit erfordernde anwendung
FI821981A FI821981A0 (fi) 1980-11-11 1982-06-03 Apparat foer avskiljande av fasta partiklar naermast foer tillaempningar som fordrar oekad driftstrygghet
DK283082A DK283082A (da) 1980-11-11 1982-06-23 Apparat til adskillelse af faste partikler specielt til anvendelser der kraever foroeget driftssikkerhed

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
HU2693/80801111 1980-11-11
HU802693A HU183245B (en) 1980-11-11 1980-11-11 Apparatus for separating solide particles, first of all for high operational safety

Publications (1)

Publication Number Publication Date
WO1982001665A1 true WO1982001665A1 (fr) 1982-05-27

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ID=10960673

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/HU1981/000044 WO1982001665A1 (fr) 1980-11-11 1981-11-11 Appareil de separation de particules solides essentiellement pour des applications exigeant une plus grande securite de fonctionnement

Country Status (13)

Country Link
JP (1) JPS57501912A (fr)
AU (1) AU8626382A (fr)
BE (1) BE891104A (fr)
DD (1) DD201855A5 (fr)
DK (1) DK283082A (fr)
ES (1) ES8801989A1 (fr)
FR (1) FR2493722A1 (fr)
GB (1) GB2099719A (fr)
HU (1) HU183245B (fr)
NL (1) NL8120441A (fr)
PL (1) PL233775A1 (fr)
SE (1) SE8204159L (fr)
WO (1) WO1982001665A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0357917A1 (fr) * 1988-08-02 1990-03-14 Kessler & Luch GmbH Filtre protecteur
CN114712961A (zh) * 2022-04-22 2022-07-08 中国神华煤制油化工有限公司 一种除蜡器、除蜡装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108889041A (zh) * 2018-05-30 2018-11-27 广东知识城运营服务有限公司 一种燃气净化用除尘机构
CN112973257B (zh) * 2021-02-18 2022-04-22 珠海格力电器股份有限公司 滤芯防堵检测方法、装置、存储介质及净水设备

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU434965A1 (ru) * 1971-11-26 1974-07-05 И. К. Гор чев Фильтр для очистки газов
SU637129A1 (ru) * 1977-07-08 1978-12-15 Предприятие П/Я А-7113 Устройство дл автоматического управлени рукавным фильтром
FR2391761A1 (fr) * 1977-05-25 1978-12-22 Donaldson Co Inc Epurateur d'air a deux etages
SU850144A1 (ru) * 1979-10-11 1981-07-30 Белорусский Ордена Трудового Красногознамени Политехнический Институт Устройство дл очистки гидравлическихжидКОСТЕй

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL288137A (fr) * 1900-01-01
GB827220A (en) * 1956-12-13 1960-02-03 Prvni Brnenska Strojirna Zd Y A filter moving mechanism, more particularly for liquids
GB1317015A (en) * 1970-07-11 1973-05-16 Ifa Getriebewerke Brandenburg Apparatus for separating impurities from liquids
GB2035115A (en) * 1978-11-17 1980-06-18 Drori M Backwashable fluid filter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU434965A1 (ru) * 1971-11-26 1974-07-05 И. К. Гор чев Фильтр для очистки газов
FR2391761A1 (fr) * 1977-05-25 1978-12-22 Donaldson Co Inc Epurateur d'air a deux etages
SU637129A1 (ru) * 1977-07-08 1978-12-15 Предприятие П/Я А-7113 Устройство дл автоматического управлени рукавным фильтром
SU850144A1 (ru) * 1979-10-11 1981-07-30 Белорусский Ордена Трудового Красногознамени Политехнический Институт Устройство дл очистки гидравлическихжидКОСТЕй

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0357917A1 (fr) * 1988-08-02 1990-03-14 Kessler & Luch GmbH Filtre protecteur
CN114712961A (zh) * 2022-04-22 2022-07-08 中国神华煤制油化工有限公司 一种除蜡器、除蜡装置
CN114712961B (zh) * 2022-04-22 2024-08-13 中国神华煤制油化工有限公司 一种除蜡器、除蜡装置

Also Published As

Publication number Publication date
SE8204159D0 (sv) 1982-07-05
DK283082A (da) 1982-06-23
SE8204159L (sv) 1982-07-05
ES8801989A1 (es) 1987-02-01
DD201855A5 (de) 1983-08-17
NL8120441A (nl) 1982-10-01
HU183245B (en) 1984-04-28
AU8626382A (en) 1984-10-18
BE891104A (fr) 1982-03-01
GB2099719A (en) 1982-12-15
FR2493722A1 (fr) 1982-05-14
ES506971A0 (es) 1987-02-01
PL233775A1 (fr) 1982-06-07
JPS57501912A (fr) 1982-10-28

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