DK146677B - PROCEDURE FOR REMOVAL AND REMOVAL OF FILTER REMOVAL FROM BOILER FILTERS - Google Patents
PROCEDURE FOR REMOVAL AND REMOVAL OF FILTER REMOVAL FROM BOILER FILTERS Download PDFInfo
- Publication number
- DK146677B DK146677B DK307173AA DK307173A DK146677B DK 146677 B DK146677 B DK 146677B DK 307173A A DK307173A A DK 307173AA DK 307173 A DK307173 A DK 307173A DK 146677 B DK146677 B DK 146677B
- Authority
- DK
- Denmark
- Prior art keywords
- filter
- removal
- filtration
- filter elements
- compartment
- Prior art date
Links
- 238000000034 method Methods 0.000 title description 9
- 238000001914 filtration Methods 0.000 description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 20
- 239000000706 filtrate Substances 0.000 description 18
- 239000007788 liquid Substances 0.000 description 8
- 239000012065 filter cake Substances 0.000 description 7
- 239000007787 solid Substances 0.000 description 4
- 230000001464 adherent effect Effects 0.000 description 2
- 238000011001 backwashing Methods 0.000 description 2
- 230000009172 bursting Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000005909 Kieselgur Substances 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 235000021395 porridge Nutrition 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D37/00—Processes of filtration
- B01D37/02—Precoating the filter medium; Addition of filter aids to the liquid being filtered
-
- 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
- B01D29/13—Supported filter elements
- B01D29/15—Supported filter 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
- B01D29/50—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 multiple filtering elements, characterised by their mutual disposition
- B01D29/52—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 multiple filtering elements, characterised by their mutual disposition in parallel connection
-
- 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
- B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
- B01D29/94—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for discharging the filter cake, e.g. chutes
-
- 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
- B01D2201/00—Details relating to filtering apparatus
- B01D2201/04—Supports for the filtering elements
- B01D2201/043—Filter tubes connected to plates
- B01D2201/0446—Filter tubes connected to plates suspended from plates at the upper side of the filter elements
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtration Of Liquid (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Lift Valve (AREA)
Description
146677 5 Opfindelsen angår en fremgangsmåde til fjernelse og bortledning af filtreringsrester fra kedelfiltre med et filtratrum og som angivet i kravets indledning.The invention relates to a method of removing and diverting filtration residues from boiler filters with a filtrate compartment and as set forth in the preamble of claim.
Ved en kendt fremgangsmåde til fjernelse og bortled-10 ning af filtreringsrester bliver først filtratrummét og derefter den egentlige filtreringsbeholder, råvandsrummet, påvirket med trykgas under opretholdelse af en gennem filterelementerne med de derpå hæftende filtreringsrester ledet strømning. Derved er såvel 15 filtratrummet som filtreringsbeholderen helt fri for væske. Herved danner nødvendigvis filtreringsresterne i vidt omfang afvandede lag eller kager. Udløsningen af disse lag sker med trykluft eller forholdsvis ringe returskylning med vand, hvorved de i samlerummet frem-20 kommende filterrester kan bortledes i klumpform eller grødform og fjernes via en beholder. Nødvendigvis bliver de på filterelementerne hæftende filterkager ved indledningen af trykgassen tørret ud over det ønskede omfang. Trykluften trænger gennem filtratrummet og 25 filterelementerne ind i råvandsrummet. Det har herved vist sig, at kun den øvre del af filterresterne på filterelementerne bliver bortsprængt af trykluften.In a known method for removing and discharging filtration residues, the filtrate drum and then the actual filtration vessel, the raw water compartment, are first treated with pressurized gas while maintaining a flow conducted through the filter elements with the filtration residues adhered thereto. Thus, both the filtrate compartment and the filtration vessel are completely free of liquid. Hereby, the filtration residues necessarily form to a large extent dewatered layers or cakes. These layers are discharged with compressed air or relatively little backwashing with water, whereby the filter residues present in the assembly room can be discharged in lump or porridge form and removed via a container. Necessarily, the filter cakes adhering to the filter elements are dried at the beginning of the compressed gas beyond the desired extent. The compressed air enters the filtrate compartment and the filter elements into the raw water compartment. It has thereby been found that only the upper part of the filter residues on the filter elements are blown away by the compressed air.
Efter bortsprængningen af det øvre lag fremkommer der i højde med den adskilte bund mellem filtratrummet 30 og råvandsrummet nødvendigvis en stor gennemtrædnings-flade, fra hvilken trykgassen uhindret kan udtræde.Following the disruption of the upper layer, at a height of the separated bottom between the filtrate compartment 30 and the raw water compartment, a large penetration surface necessarily emerges, from which the compressed gas can exit unhindered.
Den overvejende del af filtreringshjælpemidlerne og grumsstofferne forbliver følgelig i det nedre område af filterelementerne.Accordingly, the predominant portion of the filtering aids and turbidity remains in the lower region of the filter elements.
2 146677 1 Ved en anden kendt fremgangsmåde bliver der fra en særskilt trykbeholder slag- eller stødagtigt ført en blanding af luft og vand ind i filtratrummet og fra dette til filterelementerne. Derved bliver de vedhæf-5 tende filtreringsrester sprængt bort fra filterelementerne. En sådan fremgangsmåde kan kun anvendes med godt resultat ved filterelementer, der er udformet som rør og har et forholdsvis stort tværsnit. Det store tværsnit er tvingende nødvendigt, for at det med luft 10 blandede vand også virkelig kan ledes ind i det indre af filterelementerne i hele længden. En væsentlig forudsætning er det derved, at denne afsprængning finder sted samtidigt ved alle filterelementerne.In another known method, a mixture of air and water is introduced into the filtrate compartment and from it to the filter elements from a separate pressure vessel or shock-like. Thereby, the adherent filtration residues are blasted away from the filter elements. Such a method can only be used with good results for filter elements which are designed as tubes and have a relatively large cross-section. The large cross-section is imperative that the water mixed with air 10 can also really be fed into the interior of the filter elements throughout the length. An important prerequisite is that this bursting takes place simultaneously at all the filter elements.
15 Det er også blevet foreslået at bortlede den i kedelfilteret stående væske ved indføring af trykvand efter åbning af en i råvandsrummet værende udtømningsåbning.It has also been proposed to drain the liquid contained in the boiler filter by introducing pressurized water after opening a discharge opening in the raw water space.
Herved strømmer trykvandet gennem filtratrummet og filterelementerne og løsner filtreringsresterne. Filtre-20 ringsresterne kommer således ned i det nedre samlerum af kedelfilteret. Efter en vis opholdstid her indtræder en vis bundfældning af filtreringsresterne, som så med trykgas ledes ud af samlerummet. Herved har det vist sig, at selv efter lang opholdstid kan ingen filtre-25 ringsrester, henholdsvis filtreringshjælpemidler, udføres i fast, skovlelig form. Der dannes derimod en tynd suspension med vand og filtreringsrester, der må bortledes gennem ledninger. Dette svarer imidlertid ikke til det ønskelige resultat, idet der ved en fly-30 dende bortledning kræves en yderligere bundfældning i ekstra samlebeholdere eller lignende.In this way, the pressurized water flows through the filtrate compartment and the filter elements, releasing the filtration residues. Thus, the filtration residues enter the lower boiler filter assembly space. After a certain residence time, there is a certain precipitation of the filtration residues, which is then discharged with pressure gas from the collection room. Hereby, it has been found that even after long residence time, no filtration residues or filtration aids, respectively, can be carried out in solid, bucket form. In contrast, a thin suspension is formed with water and filtration residues, which must be drained through conduits. However, this does not correspond to the desirable result, in the event of a liquid discharge, a further precipitation in additional collecting containers or the like is required.
For at undgå de nævnte ulemper er det formålet med opfindelsen, også ved filterelementer med lille diame- 3 U6677 1 ter og under undgåelse af en særlig trykdel, at kunne udføre en tør, fast masse af filtreringsrester. Derudover er det stillet den opgave med forholdsvis små væsketab at sikre en særdeles regelmæssig fjernelse 5 af filtreringsresterne fra filterelementerne.In order to avoid the disadvantages mentioned, it is the object of the invention to be able to carry out a dry, solid mass of filtration residues, even with filter elements with small diameters and with the avoidance of a special pressure part. In addition, it is tasked with relatively small fluid losses to ensure a very regular removal of the filtration residues from the filter elements.
Dette opnås ved at gå frem som angivet i kravets kendetegnende del. Med denne fremgangsmåde fås en upåklagelig fjernelse af filtreringsresterne, som kan gen-10 nemføres på hele længden af filterelementer selv med lille inderdiameter. Samtidig bliver de ellers i stor målestok nødvendige tilbageskylninger unødvendige, og man får et tørt og lugtfrit materiale, der borttransporteres med en luftstrøm.This is achieved by proceeding as indicated in the characterizing part of the claim. This method provides impeccable removal of the filtering residues, which can be applied to the entire length of filter elements even with a small inner diameter. At the same time, otherwise, to a large extent, necessary backwashing becomes unnecessary and a dry and odor-free material is transported away with an air stream.
1515
Yderligere træk ved opfindelsen fremgår af den følgende beskrivelse, i hvilken fremgangsmåden ifølge opfindelsen er forklaret i forbindelse med en på tegningen vist udførelsesform for filteret.Further features of the invention will be apparent from the following description in which the method of the invention is explained in connection with an embodiment of the filter shown in the drawing.
2020
Det på tegningen viste kedelfilter har et hætteformet filtratrum 1, hvortil er sluttet et råvandsrum 2. Råvandsrummet 2 består af en cylindrisk del med et derunder anbragt kegleformet tilspidset samlerum 21, hvis 25 åbningsvinkel er ca 40 - 70°. De to rum 1 og 2, 2' er adskilt ved en mellemplade 3 med boringer til optagelse af filterelementer 4. Den nedre del af samle-rummet 2T har en studs med en dysefordelerring 12.Pra denne dysefordelerring fører dyser 11, forbundet med 30 en luftledning 10, ind i det indre af rummet 2*.The boiler filter shown in the drawing has a cap-shaped filtrate compartment 1, to which is connected a raw water compartment 2. The raw water compartment 2 consists of a cylindrical part with a cone-shaped tapered tapered compartment 21, whose opening angle is about 40 - 70 °. The two compartments 1 and 2, 2 'are separated by an intermediate plate 3 with bores for receiving filter elements 4. The lower part of the assembly space 2T has a stud with a nozzle distributor ring 12. From this nozzle distributor ring nozzles 11, connected to a 30, are provided. air line 10, into the interior of the room 2 *.
146677 4 1 Det ufiltrerede medium tilsat filtreringshjælpemidler, strømmer gennem en ledning 8 ind i råvandsrummet 2,2' og gennemstrømmer filterelementerne 4. Filtratet kommer gennem filterelementerne 4 ind i filtratrummet 1 og 5 bliver gennem en filtratledning 6 bortledt til yderligere stationer. De medførte filtreringshjælpemidler afsættes på filterelementerne og danner her filterkager bestående af filtreringshjælpemidler og grumsstoffer. Til fjernelse af disse filtreringsrester bliver 10 råvandsdelen 2.2’ af kedelfilteret udtømt gennem en ledning 9· Bortstrømningen af den i filterelementerne 4 og filtratrummet 1 værende væske forhindres, f.eks. ved trykopbygning af trykgassen i råvandsrummet 2.The unfiltered medium, with filtration aids, flows through a conduit 8 into the raw water space 2,2 'and flows through the filter elements 4. The filtrate enters through the filter elements 4 into the filtrate compartments 1 and 5, through a filtrate conduit 6 being diverted to further stations. The entrained filtration aids are deposited on the filter elements and here form filter cakes consisting of filtration aids and turbidity. To remove these filtration residues, the raw water part 2.2 'of the boiler filter is discharged through a conduit 9 · The flow of the liquid present in the filter elements 4 and the filtrate compartment 1 is prevented, e.g. by pressure build-up of the compressed gas in the raw water space 2.
Trykgassen kan føres til rummet 2 gennem en ledning 7 15 eller 8. Bortstrømningen af væsken kan også forhindres af selve filterkagen. Denne er under filtreringen blevet således fast ved afsætning af bundfalsstof, at selv i trykløs tilstand er en nedglidning af filterkagen ikke mulig.The pressurized gas can be passed to space 2 through a conduit 7 15 or 8. The flow of the liquid can also be prevented by the filter cake itself. During filtration, this has become so fixed by deposition of precipitate that even in a pressureless state, a slip of the filter cake is not possible.
20 Så snart råvandsrummet 2 af kedelfilteret er befriet for væske, bliver ledningen 7 åbnet, og den i kedelfilteret værende trykgas fjernet. Filteret er hermed ganske trykløst. Det i filterelementerne 4 og filter-25 rummet 1 værende vand siver nu langsomt gennem filterkagen. Dermed sikres, at filterkagen ikke tørres helt ud. Så snart modtrykket i kedelfilteret er helt fjernet, åbnes ledningen 5 til tilledning af trykgassen til filtratrummet 1. Ved den regelmæssige og umiddelbare fort-30 plantning af trykket i væsken bliver den vedhæftende kage afsprængt på hele længden af filterelementerne 4 og falder ned i det kegleformet tilspidsede samlerum 2'.As soon as the raw water space 2 of the boiler filter is free of liquid, the conduit 7 is opened and the compressed gas contained in the boiler filter is removed. The filter is thus quite pressure-free. The water present in the filter elements 4 and the filter compartment 1 now slowly seeps through the filter cake. This ensures that the filter cake is not completely dried out. As soon as the backpressure in the boiler filter is completely removed, the conduit 5 is opened to supply the compressed gas to the filtrate compartment 1. Upon regular and immediate propagation of the pressure in the liquid, the adherent cake is detonated over the entire length of the filter elements 4 and falls into the cone-shaped tapered gathering space 2 '.
5 146 67 7 1 Derefter bliver der gennem en ledning 10, der er forbundet med dysefordelerringen 12, indført luft gennem dyserne 11 ind i samlerummet 2'. Derved bliver den i samlerummet 2' værende blanding af filtreringshjælpe-5 midler og grumsstoffer homogeniseret. Efter kort tid er denne proces afsluttet, hvorefter der gennem strømningsvejen 5 eller 7 indledes trykgas i råvandsrummet 2,2' til bortledning af den skovlelige faste filtreringshjælpemasse. Filtreringshjælpemassen bliver ved 10 hjælp af en ledning 9 ført til en vogn eller en rys-tebox.Then, through a conduit 10 connected to the nozzle distributor ring 12, air is introduced through the nozzles 11 into the assembly space 2 '. Thereby, the mixture of filtration aids and turbidity in the assembly room 2 'is homogenized. After a short time, this process is completed, after which, through flow path 5 or 7, compressed gas is introduced into the raw water space 2,2 'to drain away the bucket solid filtration auxiliary mass. The filter aid mass is fed to a carriage or a rice tebox by means of a conduit 9.
Filtratrummet 1 er før indledningen af trykgassen til afsprængning af filéringsresterne fra filterelementer-15 ne 4 opfyldt med en ringe del filtrat. Denne ringe mængde er ikke i stand til at bevirke en fortynding af filtreringshjælpemidlerne. Herved sikres, uden en ekstra teknisk indsats, at kiselgur,filtreringshjælpemidler og grumsstoffer kan udføres fra filteret uden 20 rest i fast skovlelig form.The filtrate compartment 1 is filled with a small portion of filtrate prior to the introduction of the compressed gas for bursting the filtration residues from the filter elements 4. This small amount is not capable of causing a dilution of the filtration aids. This ensures, without extra technical effort, that diatomaceous earth, filtration aids and turbidity can be carried out from the filter without 20 residues in solid bucket form.
Til undgåelse af filtrattab er det med denne fremgangsmåde uden videre muligt at fjerne den filtrerede væske fuldstændigt fra filtratrummet og erstatte den ved til-25 ledning af vand gennem strømningsbanen 6. Herved kræves kun små mængder. Også i dette tilfælde sikres en tilstrækkelig fugtning af filterkagen.Samtidig tjener den i filtratrummet 1 værende vandmængde ved trykstigning gennem ledningen 5 til afsprængning af filtrerings-30 resterne på filterelementerne 4.In order to avoid filtrate losses, it is possible without this method to completely remove the filtered liquid from the filtrate compartment and replace it by supplying water through the flow path 6. Only small amounts are required. In this case, too, sufficient wetting of the filter cake is ensured. At the same time, the amount of water remaining in the filtrate compartment 1 serves as pressure rise through the conduit 5 to burst the filtration residues on the filter elements 4.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2227821A DE2227821B2 (en) | 1972-06-08 | 1972-06-08 | Process for removing and discharging filter residues from boiler litter |
| DE2227821 | 1972-06-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DK146677B true DK146677B (en) | 1983-12-05 |
| DK146677C DK146677C (en) | 1984-06-12 |
Family
ID=5847122
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DK307173A DK146677C (en) | 1972-06-08 | 1973-06-04 | PROCEDURE FOR REMOVAL AND REMOVAL OF FILTER REMOVAL FROM BOILER FILTERS |
Country Status (6)
| Country | Link |
|---|---|
| AT (1) | AT334920B (en) |
| CH (1) | CH569503A5 (en) |
| DE (1) | DE2227821B2 (en) |
| DK (1) | DK146677C (en) |
| GB (1) | GB1438793A (en) |
| NO (1) | NO136176C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2434343C3 (en) * | 1974-07-17 | 1983-12-08 | Holstein Und Kappert Gmbh, 4600 Dortmund | Process for low-oxygen precoating of filter aids on filter surfaces |
| CA1190483A (en) * | 1977-06-22 | 1985-07-16 | Kostas S. Arvanitakis | Vertical filter system |
| CH627089A5 (en) | 1977-12-16 | 1981-12-31 | Chemap Ag | |
| DE2923010A1 (en) * | 1979-06-07 | 1980-12-18 | Interliz Anstalt | FLOODING FILTRATION DEVICE FOR FILTERING TURBID LIQUIDS AND FILTRATION METHOD WITH SUCH A DEVICE |
| DE3722238A1 (en) * | 1987-07-06 | 1989-01-19 | Faudi Feinbau | METHOD FOR CLEANING FILTER CANDLES IN precoat filters and DEVICE FOR IMPLEMENTING THE METHOD |
| DE19837569B4 (en) | 1998-08-19 | 2006-07-06 | Khs Ag | Method for cleaning filter candles of a candle filter |
| CN114235730A (en) * | 2022-02-21 | 2022-03-25 | 中国科学院烟台海岸带研究所 | Seawater nutrient salt online monitoring system and seawater nutrient salt detection method |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE969655C (en) * | 1951-05-19 | 1958-07-24 | Hans Widmaier | Switches for electrical circuit diagrams can be locked in different positions |
| US2780363A (en) * | 1952-12-22 | 1957-02-05 | Infilco Inc | Apparatus and process for washing diatomite type filters |
| DE1536779A1 (en) * | 1966-11-10 | 1970-02-26 | Enzinger Union Werke Ag | Precoat filters for liquids, e.g. Beverages |
| DE1536782A1 (en) * | 1967-05-30 | 1970-02-12 | Enzinger Union Werke Ag | Method and device for removing the residual liquid remaining in a tank filter after filtration |
| DE1536783C3 (en) * | 1967-05-30 | 1974-02-28 | Enzinger-Union-Werke Ag, 6800 Mannheim | Process for removing the filter residue formed from kieselguhr and turbid substances from boiler filters |
| CH481669A (en) * | 1967-07-12 | 1969-11-30 | Filtrox Maschb Ag | Process for cleaning a filter device with built-in filter and device for carrying out the process |
| DE1972025U (en) * | 1967-08-12 | 1967-11-09 | Sack Gmbh Maschf | DEVICE FOR CLEANING LIQUIDS, IN PARTICULAR BOHROELEN OD. DGL. |
-
1972
- 1972-06-08 DE DE2227821A patent/DE2227821B2/en not_active Ceased
-
1973
- 1973-05-18 AT AT437273A patent/AT334920B/en not_active IP Right Cessation
- 1973-06-04 DK DK307173A patent/DK146677C/en active
- 1973-06-06 NO NO2366/73A patent/NO136176C/en unknown
- 1973-06-07 GB GB2711473A patent/GB1438793A/en not_active Expired
- 1973-06-07 CH CH830573A patent/CH569503A5/xx not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| GB1438793A (en) | 1976-06-09 |
| DE2227821A1 (en) | 1973-12-20 |
| CH569503A5 (en) | 1975-11-28 |
| NO136176C (en) | 1977-08-03 |
| ATA437273A (en) | 1976-06-15 |
| DK146677C (en) | 1984-06-12 |
| NO136176B (en) | 1977-04-25 |
| AT334920B (en) | 1977-02-10 |
| DE2227821B2 (en) | 1980-02-28 |
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