DE3909371A1 - Process for unpressurised dissolution and purification of gases in liquids - Google Patents
Process for unpressurised dissolution and purification of gases in liquidsInfo
- Publication number
- DE3909371A1 DE3909371A1 DE3909371A DE3909371A DE3909371A1 DE 3909371 A1 DE3909371 A1 DE 3909371A1 DE 3909371 A DE3909371 A DE 3909371A DE 3909371 A DE3909371 A DE 3909371A DE 3909371 A1 DE3909371 A1 DE 3909371A1
- Authority
- DE
- Germany
- Prior art keywords
- gas
- liquid
- discs
- disks
- gases
- 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- Withdrawn
Links
- 239000007789 gas Substances 0.000 title claims abstract description 36
- 239000007788 liquid Substances 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims description 27
- 238000004090 dissolution Methods 0.000 title 1
- 238000000746 purification Methods 0.000 title 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims 2
- 238000005406 washing Methods 0.000 claims 1
- 230000002093 peripheral effect Effects 0.000 abstract description 2
- 230000001174 ascending effect Effects 0.000 abstract 1
- 238000010276 construction Methods 0.000 abstract 1
- 230000008021 deposition Effects 0.000 abstract 1
- 239000002904 solvent Substances 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 2
- 241000498779 Myristica Species 0.000 description 1
- 235000009421 Myristica fragrans Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000001702 nutmeg Substances 0.000 description 1
- 238000005293 physical law Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/237—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media
- B01F23/2376—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media characterised by the gas being introduced
- B01F23/23761—Aerating, i.e. introducing oxygen containing gas in liquids
- B01F23/237613—Ozone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
- B01F23/23105—Arrangement or manipulation of the gas bubbling devices
- B01F23/2311—Mounting the bubbling devices or the diffusers
- B01F23/23112—Mounting the bubbling devices or the diffusers comprising the use of flow guiding elements adjacent or above the gas stream
- B01F23/231122—Mounting the bubbling devices or the diffusers comprising the use of flow guiding elements adjacent or above the gas stream the flow guiding elements being dome-shaped elements, i.e. for trapping air, e.g. cap-, umbrella- or inversed cone-shaped
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
- B01F23/2336—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the location of the place of introduction of the gas relative to the stirrer
- B01F23/23362—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the location of the place of introduction of the gas relative to the stirrer the gas being introduced under the stirrer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/2366—Parts; Accessories
- B01F23/2368—Mixing receptacles, e.g. tanks, vessels or reactors, being completely closed, e.g. hermetically closed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/237—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media
- B01F23/2376—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media characterised by the gas being introduced
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/05—Stirrers
- B01F27/11—Stirrers characterised by the configuration of the stirrers
- B01F27/115—Stirrers characterised by the configuration of the stirrers comprising discs or disc-like elements essentially perpendicular to the stirrer shaft axis
- B01F27/1154—Stirrers characterised by the configuration of the stirrers comprising discs or disc-like elements essentially perpendicular to the stirrer shaft axis the discs being cup shaped, e.g. semi sphere
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/05—Stirrers
- B01F27/11—Stirrers characterised by the configuration of the stirrers
- B01F27/19—Stirrers with two or more mixing elements mounted in sequence on the same axis
- B01F27/191—Stirrers with two or more mixing elements mounted in sequence on the same axis with similar elements
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum drucklosen Lösen und Reinigen von Gasen in Flüssigkeiten.The invention relates to a method for unpressurized loosening and cleaning Gases in liquids.
Bekanntlich gibt es verschiedene Verfahren zum Lösen von Gasen in Flüssigkeiten. Diese arbeiten auf der Basis verschiedener physikalischer Gesetzmäßigkeiten, wie Druckerhöhung oder Temperaturerniedrigung der Solventien. Die genannten Faktoren tragen zu einer erhöhten Löslichkeit der zu lösenden Gase im ver wendeten Solvens bei.As is known, there are various methods for dissolving gases in liquids. These work on the basis of various physical laws, such as increasing the pressure or lowering the temperature of the solvents. The above Factors contribute to an increased solubility of the gases to be dissolved in the ver applied solvent.
Bisher wurden derartige Verfahren jedoch meistens nur großtechnisch durchge führt. Es erscheint einsichtig, daß die Peripherie (Kompressoren, Kühlaggregate etc.) bisher zu groß und zu teuer war, als daß diese Verfahren für Kleinan wender interessant gewesen wären.So far, however, such processes have mostly only been carried out on an industrial scale leads. It seems reasonable that the periphery (compressors, cooling units etc.) was previously too large and too expensive for this procedure for Kleinan would have been interesting.
Doch gerade im Kleinanwenderbereich eröffnen sich ungeahnte und bisher unge nutzte Einsatzmöglichkeiten.But especially in the small user area, unprecedented and previously unseen used possible applications.
Der Erfinder hat sich zum Ziel gesetzt, ein Verfahren zu entwickeln, welches effektiv arbeitet und auf teure Peripherieeinrichtungen verzichtet, mit der Absicht, Transportabilität und Kleinanwenderfreundlichkeit zu erreichen.The inventor has set itself the goal of developing a method which works effectively and dispenses with expensive peripheral equipment with which Intent to achieve portability and small user friendliness.
Zur Lösung dieser Aufgabe führt, daß die Löslichkeit der Gase auf dem Prinzip der Oberflächenvergrößerung beeinflußt wird.To solve this problem, the solubility of the gases leads to the principle the surface enlargement is affected.
Durch die Oberflächenvergrößerung der Gasblasen, die das flüssige Medium durch strömen, wird eine exponentielle Zunahme der Löslichkeit der Gase erreicht. Due to the surface enlargement of the gas bubbles through the liquid medium flow, an exponential increase in the solubility of the gases is achieved.
Diese Oberflächenvergrößerung geschieht in einer säulenförmigen Anordnung, in der sich die Flüssigkeit befindet und in der das jeweilige Gas gelöst wird. Aufgrund der nachstehenden Beschreibung eignet sich ein säulenförmiges Gefäß mehr als andere Formen, die Anordnung kann aber auch eine andere anwendungs spezifische Form annehmen, d.h. sie ist nicht unbedingt an die Säulenform ge bunden.This increase in surface area takes place in a columnar arrangement, in which the liquid is and in which the respective gas is dissolved. A columnar vessel is suitable based on the description below more than other forms, but the arrangement can also have a different application take a specific form, i.e. it is not necessarily the shape of the column bound.
Die Oberflächenvergrößerung und die damit einhergehende Zunahme der Löslich keit wird durch mechanische Einwirkung auf jede einzelne Gasblase innerhalb der zur Anwendung gelangenden Solvens erreicht.The increase in surface area and the associated increase in solubility speed is caused by mechanical action on every single gas bubble inside of the solvent used.
Im folgenden soll anhand der säulenförmigen Anordnung die praktische Anwendung des Lösens von Gasen durch Oberflächenvergrößerung geschildert werden, welches jedoch nur als Beispiel gedacht ist, und die Erfindung in keiner Weise ein schränkt.In the following, the practical application will be based on the columnar arrangement of dissolving gases by enlarging the surface, which however, is intended only as an example, and the invention in no way limits.
In eine Säule runden Querschnitts, in der sich die Flüssigkeit befindet, wird mittels einer Pumpe von unten das zu lösende Gas eingebracht. Dieses hat, bedingt durch Dichteunterschiede zur Flüssigkeit das Bestreben, nach oben aufzusteigen.In a column of round cross-section, in which the liquid is located the gas to be dissolved is introduced from below by means of a pump. This has due to differences in density to the liquid, the effort to go up to ascend.
Der hierbei auftretende Kontakt der Gasblasen mit der Flüssigkeit hätte allein für sich betrachtet wenig Effektivität was den Lösevorgang angeht, da ledig lich die Oberfläche der Gasblasen am Lösevorgang beteiligt ist.The resulting contact of the gas bubbles with the liquid would be the only thing considered in itself little effectiveness in terms of the dissolving process, since single Lich the surface of the gas bubbles is involved in the dissolving process.
Je nach Viskosität der Flüssigkeit und der zum Einblasen des Gases in die Flüssigkeit verwendeten Düsen, sind die Gasblasen mehr oder minder groß. Da die Oberfläche einer Gasblase mit sinkendem Durchmesser im Verhältnis zu ihrem Inhalt in einer Exponentialfunktion steigt, ist es das Ziel, die Blasen so klein wie möglich zu machen.Depending on the viscosity of the liquid and that for blowing the gas into the Liquid nozzles, the gas bubbles are more or less large. Because the surface of a gas bubble decreases in proportion to its diameter their content increases in an exponential function, the goal is to blow the bubbles to make it as small as possible.
Dies wird durch folgende Anordnung erreicht:
In dem oben beschriebenen Zylinder befindet sich die anzureichernde Flüssig
keit.This is achieved by the following arrangement:
In the cylinder described above is the liquid to be enriched.
Der Zylinder steht in seiner Zylinderachse senkrecht. Von unten wird das zu lösende Gas eingeleitet. The cylinder is vertical in its cylinder axis. From below it becomes solvent gas introduced.
Gleichzeitig befindet sich im Zylinder, mittig angeordnet, eine Achse auf der sich mehrere kreisrunde, übereinander befestigte Scheiben befinden, die etwas geringeren Durchmesser haben als der Zylinderinnendurchmesser.At the same time, an axis is located in the center of the cylinder which are several circular discs fastened on top of each other, the have a slightly smaller diameter than the inside diameter of the cylinder.
Die Scheiben haben viele, kreisförmig angeordnete Löcher im Durchmesser von 1-20 mm (abhängig von der Art der Flüssigkeit) und sind parabolisch nach oben gewölbt.The discs have many circular holes with a diameter of 1-20 mm (depending on the type of liquid) and are parabolic after arched at the top.
Die Achse samt Scheiben dreht sich in der Flüssigkeit mit einer Geschwindigkeit von 400-2000 UPM (ebenfalls abhängig von der verwendeten Flüssigkeit).The axis and disks rotate in the liquid at a speed from 400-2000 RPM (also depending on the liquid used).
Von großer Bedeutung ist in diesem Zusammenhang die Abstimmung der Parameter Lochgröße und Geschwindigkeit auf die verwendete Flüssigkeit und deren Visko sität. Eine allgemeine Aussage, etwa durch Nennung einer Formel ist dabei nicht möglich.The coordination of the parameters is of great importance in this context Hole size and speed on the liquid used and its visco sity. A general statement, for example by naming a formula, is included not possible.
Für Wasser beispielsweise hat sich experimentiell als günstigste Parameter kombination eine Lochgröße von 1,8 mm und eine Rotationsgeschwindigkeit von 600 UPM erwiesen. Diese Werte beziehen sich auf eine Temperatur der Flüssigkeit von 20°C, da oberhalb dieser Temperatur die Viskosität sprunghaft abnimmt.For water, for example, has experimentally proven to be the cheapest parameter combination a hole size of 1.8 mm and a rotation speed of 600 RPM proven. These values refer to a temperature of the liquid of 20 ° C, as the viscosity suddenly drops above this temperature.
Allgemein kann man als Parameterregel folgende Aussage treffen: Je höher die Viskosität der Flüssigkeit ist, umso größer müssen die Löcher in den Scheiben und umso höher der Wert der Umdrehungen pro Minute gewählt werden.In general, one can make the following statement as a parameter rule: The higher the The viscosity of the liquid is the larger the holes in the disks need to be and the higher the value of the revolutions per minute can be selected.
Je nach verwendeter Flüssigkeit kann es sich als günstig erweisen, die in den Scheiben befindlichen Löcher derart zu gestalten, daß hierdurch ein Profil ähnlich einer Muskatreibe erhalten wird. Damit kann die "Reißwirkung" und die damit einhergehende Oberflächenvergrößerung noch verstärkt werden. Dabei ist lediglich zu beachten, daß durch erhöhte Reibung mit der Flüssigkeit die Antriebseinheit entsprechend größer zu dimensionieren ist.Depending on the liquid used, it may prove beneficial to use the in to design the holes located in such a way that a profile similar to a nutmeg grater. So that the "tear effect" and the associated enlargement of the surface will be intensified. Here it should only be noted that the increased friction with the liquid The drive unit is to be dimensioned correspondingly larger.
Dies ist insbesondere bei Lösung von Gasen in hochviskosen Flüssigkeiten von Bedeutung.This is particularly the case when dissolving gases in highly viscous liquids Importance.
Wichtig ist, daß die Scheibenränder zur Zylinderwand nicht mehr als 10 mm Abstand haben. Ebenfalls von Bedeutung ist, daß die Scheibenränder mit einer sägezahnartig gezackten Struktur versehen sind. It is important that the disc edges to the cylinder wall are no more than 10 mm Distance. It is also important that the disc edges with a sawtooth-like jagged structure are provided.
Bei Abstand und Struktur der Scheibenränder ist wiederum die Viskosität der Flüssigkeit nach oben beschriebenen Kriterien zu berücksichtigen.With the distance and structure of the pane edges, the viscosity is again the Liquid according to the criteria described above.
Wird diese sich drehende Anordnung von unten mit Gas angeströmt, stoßen die Gasblasen an die Scheiben und werden von den darauf befindlichen Löchern "zer rissen".If gas flows through this rotating arrangement from below, they collide Gas bubbles on the disks and are "zer" by the holes on it tore ".
Durch die Drehung der Scheiben tritt aber ein Problem auf: Aufgrund der Reibung der Gasblasen mit der angeströmten Scheibe, werden diese durch Zentrifugalkräfte teilweise nach außen gegen die Zylinderwand gedrängt. Um dem entgegenzuwirken und trotzdem noch einwandfreie Oberflächenvergrößerung zu erhalten, sind die ScheibenA problem arises from the rotation of the discs: Due to the friction of the gas bubbles with the flowed disc, they become partly pushed outwards against the cylinder wall by centrifugal forces. To counteract this and still perfect surface enlargement to get are the disks
- 1. parabolisch gestaltet, wodurch die Gasblasen gezwungen werden, möglichst lange in Kontakt mit den Scheiben zu bleiben.1. designed parabolic, whereby the gas bubbles are forced, if possible to stay in contact with the discs for a long time.
- 2. an den Rändern sägezahnartig gezackt, so daß Gas, welches dennoch die Scheibenränder erreicht, auch hier optimal oberflächenvergrößert und mit der Flüssigkeit durchmischt wird.2. Sawtooth-like at the edges, so that gas, which is still the Disc edges reached, here also optimally enlarged and is mixed with the liquid.
Je nach Anwendungsfall verwendeten Solventien und Gasen, können mehrere Schei ben übereinander angeordnet sein.Depending on the application, the solvents and gases used can have multiple layers ben be arranged one above the other.
Vorteile der Anordnung sind:Advantages of the arrangement are:
- 1. Das Lösen geschieht drucklos, d.h. es wird kein Kompressor und es werden keine druckstabilen Gefäße benötigt.1. The release takes place without pressure, i.e. it won't be a compressor and it will no pressure-stable vessels required.
- 2. Aus vorgenanntem Grund kann die Apparatur sehr klein gehalten werden.2. For the aforementioned reason, the apparatus can be kept very small.
- 3. Das Verfahren ist äußerst preisgünstig zu realisieren.3. The process is extremely inexpensive to implement.
- 4. Das Verfahren ist für Kleinanwender geeignet.4. The method is suitable for small users.
- 5. Das Verfahren kann in vielen Gebieten eingesetzt werden, in denen dies bisher nicht möglich war.5. The method can be used in many areas where this was previously not possible.
Gedacht ist beispielsweise an einen Einsatz von Lösen von Ozon in Wasser zur anschließenden Sprühdesinfektion. Ozon bietet sich für das oben erwähnte "drucklose Lösen von Gasen" besonders an, weil es Ionencharakter und somit besonder gute Löslichkeit besitzt.One example is the use of dissolving ozone in water subsequent spray disinfection. Ozone lends itself to the above "Pressure-free dissolving of gases" particularly because it is ionic in character and therefore has particularly good solubility.
Das Verfahren eignet sich auch zum reinigen von Gasen und durch entsprechende Vergrößerung der Anordnung ist auch ein industrieller Einsatz möglich.The method is also suitable for cleaning gases and by appropriate Industrial use is also possible if the arrangement is enlarged.
Claims (15)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3909371A DE3909371A1 (en) | 1989-03-22 | 1989-03-22 | Process for unpressurised dissolution and purification of gases in liquids |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3909371A DE3909371A1 (en) | 1989-03-22 | 1989-03-22 | Process for unpressurised dissolution and purification of gases in liquids |
Publications (1)
Publication Number | Publication Date |
---|---|
DE3909371A1 true DE3909371A1 (en) | 1990-09-27 |
Family
ID=6376928
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE3909371A Withdrawn DE3909371A1 (en) | 1989-03-22 | 1989-03-22 | Process for unpressurised dissolution and purification of gases in liquids |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE3909371A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1994002239A1 (en) * | 1992-07-16 | 1994-02-03 | Ppv Verwaltungs Ag | Disc-shaped mixing tool |
CN103651237A (en) * | 2012-09-05 | 2014-03-26 | 曾进辉 | Backflow stirring mechanism and tiny bubble generating device |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52142670A (en) * | 1976-05-24 | 1977-11-28 | Toshiba Corp | Gas/liquid contact tower |
-
1989
- 1989-03-22 DE DE3909371A patent/DE3909371A1/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52142670A (en) * | 1976-05-24 | 1977-11-28 | Toshiba Corp | Gas/liquid contact tower |
Non-Patent Citations (1)
Title |
---|
ULLMANN: Encyklopädie d. techn. Chemie, 4. Aufl., Bd. 3, 1973, S. 358-361, 369-372, 392-394 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1994002239A1 (en) * | 1992-07-16 | 1994-02-03 | Ppv Verwaltungs Ag | Disc-shaped mixing tool |
US5490727A (en) * | 1992-07-16 | 1996-02-13 | Ppv-Verwaltungs-Ag | Disc-shaped mixing tool with conically beveled through bones |
CN103651237A (en) * | 2012-09-05 | 2014-03-26 | 曾进辉 | Backflow stirring mechanism and tiny bubble generating device |
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