IE60597B1 - Agitator - Google Patents

Agitator

Info

Publication number
IE60597B1
IE60597B1 IE27987A IE27987A IE60597B1 IE 60597 B1 IE60597 B1 IE 60597B1 IE 27987 A IE27987 A IE 27987A IE 27987 A IE27987 A IE 27987A IE 60597 B1 IE60597 B1 IE 60597B1
Authority
IE
Ireland
Prior art keywords
blades
fluid
rotor
liquid
sparging
Prior art date
Application number
IE27987A
Other versions
IE870279L (en
Original Assignee
Ici Plc
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 Ici Plc filed Critical Ici Plc
Publication of IE870279L publication Critical patent/IE870279L/en
Publication of IE60597B1 publication Critical patent/IE60597B1/en

Links

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
    • B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
    • B01F23/2331—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 introduction of the gas along the axis of the stirrer or along the stirrer 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
    • 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
    • B01F23/2331—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 introduction of the gas along the axis of the stirrer or along the stirrer elements
    • B01F23/23311—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 introduction of the gas along the axis of the stirrer or along the stirrer elements through a hollow stirrer axis
    • 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
    • B01F23/2331—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 introduction of the gas along the axis of the stirrer or along the stirrer elements
    • B01F23/23314—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 introduction of the gas along the axis of the stirrer or along the stirrer elements through a hollow stirrer element
    • 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
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/112—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades
    • B01F27/1123—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades sickle-shaped, i.e. curved in at least one direction
    • 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
    • B01F27/112—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades
    • B01F27/1125—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades with vanes or blades extending parallel or oblique to the stirrer axis
    • 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
    • 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
    • B01F27/192—Stirrers with two or more mixing elements mounted in sequence on the same axis with dissimilar elements

Abstract

Turbine agitator assembly for the dispersion of a fluid in a liquid comprises (a) a reservoir for liquid; (b) a rotor mounted in the reservoir with a number of radially extending blades; and (c) means for sparging a fluid into liquid liquid in the reservoir; in which (d) the fluid sparging means and the rotor being so constructed and arranged that the submerged rotor blades and/or the liquid flow they generate disperse the sparged fluid; such that (e) each of the blades is hollow and has a discontinuous leading edge, only a single trailing edge along an acute angle, no external concave surface and an open radially outer end.

Description

This invention relaxes to agitators for the dispersion of a fluid in a liquid.
Disc turbine agitators with a plurality of axially aligned plane paddle blades are known for the dispersion of sparged gases as small bubbles ia liquids in tanks and the concomitant mixing of the tank contents. In use, a vortex low pressure sone forms behind each rotating blade of the turbine, and with the gas flow rates frequently encountered in industry, the gas tends to collect and be held as a cavity In this zone? this disadvantageously reduces dispersion and mixing efficiency and can cause turbine blade erosion. The same problem would be found with a sparged liquid less dense than the tank liquid. We have now designed a turbine agitator In which vortex formation and its deleterious consequences are minimised, and which provides efficient dispersion and mixing.
Accordingly, the present invention provides a turbine agitator assembly comprising a reservoir for liquid, a rotor mounted in the reservoir and with a plurality of radially extending blades, and means for sparging a fluid into liquid in the reservoir, the fluid sparging means and the rotor being so constructed and arranged that, in use, the rotor blades (submerged In the liquid) and/or the liquid flow they generate disperse the sparged fluid, wherein each of the blades is carried by an arm, is hollow and has a discontinuous leading edge at the leading face of the blade, only a single -2ί trailing edge along an acute angle, no external ' concave surface and an open radially outer end.
A similar agitator assembly is disclosed, in EP-A-0 224. 459 (publication date : 3.6.1987, priority date i 21.11.1985).
In conventional disc turbine agitators, we have found that vortices are generated where fluid flow is not streamline along th© blade surface, but becomes separated", for example at projecting edge® (e.g. the axial edges of conventional axially-aligned paddle blades), where a trailing external surface is concave, or where there is no acute trailing edge, e.g. with circular, elliptical, square or oblong cross-section blades.
We believe that any blade fulfilling the foregoing criteria for a blade of this invention will be suitable. Within this, the blade may have a symmetrical cross-section, having a circular* parabolic or elliptical section leading face merging smoothly into a sphenoidal (i.e. wedge shaped) or sharply elongate parabolic or elliptical section trailing part.
It will be seen that the term trailing edge along an acute angle’ thus includes both angular and sharply radiused edges. Parabolic or elliptical section leading faces ar® favoured as improving the streamline around the blade* although the leading part may also be sphenoidal. A preferred blade shape is a symmetrical aerofoil-like cross-section.
The blade is hollow and the leading edge is discontinuous* for example in the form of holes* or in the preferred form of a slot symmetrically disposed in the leading face of a symmetrical cross-section blade.
The radially outer end of the blade is at least 3" partially open, so that such a blade provides a scooping action which disperses and aiixes by pumping the scooped liquid radially outwards» Typical dimensions of a blade in the present assembly are: blade length ~ p/4t projected height ~ X>/5„ where D is th© overall rotor diameter.
Typically the blade will be made of conventional metals or plastics used for turbine agitator paddles.
In its general form the blade has two elongate axes, one radial and one transverse, defining a "blade plane*. This blade plane will generally coincide with or lie parallel to any plane of rotation described by th© blade in use,, that is the blade is usually not set at sn 'attack angle on or with respect to the rotor shaft. However, this latter possibility is not excluded? but the skilled man will readily appreciate that the angle should not be so great that the trailing (or any leading) edge behaves effectively as an axially projecting edge^ and/or any trailing part of the blade surface behaves effectively as a concave surface, in tending to produce substantial vortices» The blades of the turbine rotor may be arranged in the same rotational plane or in any number of parallel rotational planes. It is preferred that the blades are arranged regularly within any one plane so that rotational balance is maximised.' Preferably they ar© also (as apt) so arranged along the shaft and with respect to each blade in any other plane in accordance with routine engineering practice that torsional -4r I balance is maximised, for example, they are arranged with equal numbers of blades in each plane, and with corresponding blades in different planes axially in register or with all the planes regularly roistionaily skewed with respect to one another The blades may also be set at any angle to the rotor shaft in an axial direction, other than a right angle in order to provide an axial component of the discharge flow.
Th© rotor may have 2 or more blades. The mixing efficiency of the turbine will generally increase with the number of blades in any one plane until such point that the blades ar© so close with respect to their transverse dimension that in use the action of any one blade interferes with the action of the following blade. Similarly the useful number of planes of blades is limited by any mutual interference between the planes due to proximity. The addition of further planes of blades increasingly remote from a single axial sparging source may also not increase the fluid© dispersing efficiency of tha turbine, but may still assist mixing of the liquid and/or liquid-fluid dispersion in the reservoir.
Subject to the foregoing suitable blade numbers include 2 to 24 coplanar blades, typically 4 to 12, and up to 5 planes of blades, typically 1.
Typically, dimensions of the rotor are determined by th® size of the reservoir, and usually the diameter will be one third to a half the corresponding reservoir transverse dimension.
Th© fluid sparging means may have a single -5aperture, or multiple apertures such as a row, grid, rose or ring. Although the sparging of liquids, in particular those less dense than the reservoir liquids, is not excluded, the sparged fluid will often be a gas.
The rotor and fluid sparging Means may be placed in any orientation and mutual position which ensures that the fluid is delivered either to the volume swept by the rotor blades or to any directly adjacent zone on which any liquid flow generated by the rotor blades impinges (in both cases 'the dispersion zone).
Tne rotor may be mounted in any orientation, although it will often be convenient to mount it upright with the sparging means mounted on the reservoir above or below it, e-g. spaced axially from it, so that the fluid may be delivered to the dispersion son® through the liquid essentially under gravity, either from below for a gas or liquid less dense than the reservoir liquid or from above for a denser liquid. The sparging means may then suitably be a hole, rose or ring coaxial with the rotorAs is common with turbine agitators the blades will not generally extend from the rotor shaft itself but will each b® mounted on an arm or an equivalent structure on the shaft. It will be apparent that an axial hole, rose or ring sparging means.,of a smaller diameter than the overall rotor diameter which does not overlap the blades will not deliver fluid to the dispersion sone without a deflector- In such a case the blades may conveniently be mounted extending from the periphery of a rotor disc, tine disc acting as a deflector. With the typical blade dimensions given hereinbefore, the disc will typically be 3D/4 in diameter, where 0 Is the overall rotor diameter.
The fluid may of course b® delivered to a zone ; radially outside the volume swept by the blades, since th® liquid pumped into this zone by the blades makes it ’ a dispersion zone; a sparging ring may be used.
Alternatively, the rotor may be mounted cross-wise with the sparging means mounted on the reservoir and spaced radially from it above or below, again conveniently to allow delivery essentially under gravity. The sparging means may then suitably be an axially aligned row, a transverse straight or arcuate row or a planer or curved grid depending on the rotor structure.
In another aspect the sparging means may be mounted on the rotor, for example as an aperture or apertures in front of each blade or spaced axially from the or a blade plane.
Orientations of the rotor appropriate to or compatible with the disposition of the sparging means and blades will be self-evident to the skilled man.
Although useful in all applications where dispersion of two fluid phases is required, the present assembly is particularly useful for gas-liquid mass transfer processes, and for low-shear thorough mixing, e.g. of sensitive substrates such as living cell fermentation suspensions or polymer latices or dispersions subject to ready degradation or coagulation.
Other aspects of the invention are defined in Claims 2 and 3.
The present invention will now be described with r ~7~ reference to three specific embodiments of the rotor and sparging means, depicted in Figures 1, 2, 3 and 4» In the Figures, a rotor is rotatably mounted vertically within a reservoir 2 (not shown) capable of holding a liquid 3 (also not shown) to submerge the rotor . The rotor consists of a shaft 5 (driven by an electric motor 6 - not shown) on which a plurality (four or six, radially extending blades 7 are mounted regularly about th® shaft 5 in a single plane by means of a disc or arms 8Each blade 7 is or symmetrical uniform aerofoil cross-section with a single sphenoidal acute-angle trailing edge 9 extending the length of the blade 7. Each blade 7 is hollow and its leading face 10 has a symmetically disposed slot 11 extending the length of the blade 7« The ends 12 of the blade 7 are open.
The blades 7 ar© mounted such that their central planes of symmetry are coplanar.
A means for sparging gas 14 is, in Figures 1 to 3, mounted on the reservoir below the level of and coaxial with the rotor. In Figures 1 and 2 it is a single aperture or a sparging ring of apertures which do not overlap the blades 7» In Figure 3 It is a sparging ring lying below a sone 19 radially outside the volume 18 swept by the blades in use» In Figure 4 the sparging means 14 consists of four apertured tubes mounted on, projecting from, and communicating with the hollow interior of the shaft S, and regularly spread between and coplanar with the blades 6» Their apertures 15 are in th® trailing face ' of each tube 14.
In use, the reservoir 2 is filled with liquid 3 to submerge the blades 7 of the rotore which is then rotated in the direction of arrow A. Gas 17 i® then supplied via sparging apertures 15 (in Figure 4 through the hollow interior of the rotor shaft 5 and tubes 14) to the volume IQ swept by the blades (in Figure 1 by deflection by the disc 8) or the zone IS- In all cases liquid is scooped in by the blades 7 through the slot 11 and discharged through the open blade end 12 into the dispersion zone 19. In Figures 1, 2 and 4 the gas 17 flows over the outer surface of the blades 7, and in all cases the gas is dispersed in the zone 199

Claims (2)

1. A turbine agitator assembly comprising a reservoir for liquid, a rotor mounted in the reservoir and with a plurality of 5 radially extending blades (7), and y means for sparging a fluid into liquid in the reservoir, th© fluid sparging means and the rotor being so constructed and arranged that, in use, the rotor blades 10 (submerged in the liquid) and/or the liquid flow they generate disperse the sparged fluid, wherein each of the blades (7) is carried by an arm (8), is hollow and has a discontinuous edge at the leading face (10) of the blade, only a single 15 trailing edge (9) along an acute angle, no external concave surface and an open radially outer end (12)2,, A turbine agitator assembly comprising a reservoir for liquid, a rotor mounted in the reservoir and with a plurality of 20 radially extending blades (7), and means for sparging a fluid into liquid in the reservoir, the fluid sparging means (14) and the rotor being so constructed and arranged that. In use, the rotor blades 25 (submerged in the liquid) and/or the liquid flow they generate disperse the sparged fluid, wherein each of the blades (7) is hollow and has a discontinuous edge at the leading face of the blade, only a single trailing edge (9) along an acute 30 angle, no external concave surface and sn open radially outer end (12) and wherein the sparging means (14) is so arranged that in use it delivers the sparging fluid to a zone radially outside the volume swept by the blades. 3. A turbine agitator assembly comprising: $ 35 a reservoir for liquid; a rotor mounted in the reservoir and carrying a plurality of blades (7); and means (14) for sparging a fluid into liquid in the 5 reservoir; the fluid sparging means and the rotor being so constructed and arranged that, in use, the rotor blades and/or th© liquid flow they generate disperse the sparged fluid, 10 wherein each of the blades (7) is of scoop shaped configuration, the mouth of which forms the leading face (10) of the blade, in that each blade has only a single trailing edge (9) along an acute angle, no external concave surface and an open end (12) through 15 which liquid is discharged, and wherein each blade is set at an angle to the axis of rotation of the rotor in order to provide an axial component of the discharge flow. 4. An assembly according to any one of claims 1 to 20 3, wherein each blade has a symmetrical aerofoil-like cross-section with a parabolic or elliptical section leading face merging smoothly into a sphenoidal trailing part. 5. An assembly according to claim 4 having a slot 23 (ll) symmetrically disposed in the leading face. S, An assembly according to claim 4 or 5 wherein the blade plane coincides with or lies parallel to the plane of rotation of the blade in use. 7. An assembly according to any one of claims 1 to 6 30 wherein the blades are arranged regularly in the same rotational plane or in each of a number of parallel rotational planes. 8. An assembly according to claim 7 wherein the blades are arranged in a number of parallel rotational 35 planes having the same number of blades in each plane ί and corresponding blades in different planes axially in register or with all the planes regularly rotationally skewed with respect to one another. 9. An assembly according to claim having 4 to 12 5 blades in a single rotational plane. XO. An assembly according to claim 3* or any one of claims 4 to 9 when appendant to claim 3, wherein the blades are mounted on a horizontal rotor disc and the assembly is so arranged that in use the disc serves to 10 deflect the sparging fluid to the volume swept by the blades. 11. An assembly according to claim 1, or any one of claims 4 to 9 when appendant to claim 1 wherein the sparging means is so arranged that in use it delivers 15 the sparging fluid to a sone radially outside the volume swept by the blades. 12. An assembly according to claim 1 wherein the sparging means Is mounted on the rotor. 13. An agitator as claimed In claim 2 or 3 or any one 20 of claims 4 co 9, or claim 11* when appendant to claim 2 or 3 in which each blade Is carried by an arm (8). 14. A turbine agitator assembly substantially as hereinbefore described with particular reference to and as illustrated in the accompanying
2. ,5 drawings.
IE27987A 1986-02-17 1987-02-03 Agitator IE60597B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB868603904A GB8603904D0 (en) 1986-02-17 1986-02-17 Agitators

Publications (2)

Publication Number Publication Date
IE870279L IE870279L (en) 1987-08-17
IE60597B1 true IE60597B1 (en) 1994-07-27

Family

ID=10593203

Family Applications (1)

Application Number Title Priority Date Filing Date
IE27987A IE60597B1 (en) 1986-02-17 1987-02-03 Agitator

Country Status (12)

Country Link
EP (1) EP0234768B1 (en)
JP (1) JPS62193635A (en)
AT (1) ATE83169T1 (en)
AU (1) AU580702B2 (en)
CA (1) CA1257196A (en)
DE (1) DE3782951T2 (en)
ES (1) ES2037078T3 (en)
GB (1) GB8603904D0 (en)
HK (1) HK1001041A1 (en)
IE (1) IE60597B1 (en)
NZ (1) NZ219280A (en)
ZA (1) ZA87882B (en)

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Publication number Priority date Publication date Assignee Title
GB9101546D0 (en) * 1990-02-05 1991-03-06 Ici Plc Agitators
GB2268420B (en) * 1992-07-04 1995-11-29 Flow Research Evaluation Diagn Improvements relating to liquid treatment apparatus
US5791780A (en) * 1997-04-30 1998-08-11 Chemineer, Inc. Impeller assembly with asymmetric concave blades
JP2003010664A (en) * 2001-07-03 2003-01-14 Kawata Mfg Co Ltd Mixing device for powdery/granular material
DE10336054B4 (en) * 2003-08-01 2005-12-15 Domo Caproleuna Gmbh Process for the preparation of hydroxylammonium salts
DE102007001711A1 (en) * 2007-01-11 2008-07-17 EKATO Rühr- und Mischtechnik GmbH Stirring arrangement with a stirrer and a gassing device
US20080199321A1 (en) * 2007-02-16 2008-08-21 Spx Corporation Parabolic radial flow impeller with tilted or offset blades
CN103958041B (en) * 2011-11-24 2016-10-19 王利 There is the agitator arm of blade paddle shape
NL2009286C2 (en) 2012-08-06 2014-02-10 Stichting Energie Swallow tail airfoil.
US11136958B2 (en) 2012-08-06 2021-10-05 Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno Swallow tail airfoil
CN102974504B (en) * 2012-12-06 2016-05-18 济南圣泉集团股份有限公司 A kind of anti-precipitation coating machine
JP2014136203A (en) * 2013-01-18 2014-07-28 Chugoku Electric Power Co Inc:The Agitator
DE102013002060A1 (en) * 2013-02-07 2014-08-07 Wilfried Rummel Apparatus for producing colloidal fluids with a colloidation vessel and method
JP5898297B2 (en) * 2014-11-20 2016-04-06 グローバルアドバンストメタルジャパン株式会社 Method for producing nitrogen-containing metal powder

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AU502018B2 (en) * 1976-05-04 1979-07-12 United States Filter Corporation Mixing apparatus
US4159181A (en) * 1976-12-23 1979-06-26 American Pelletizing Corporation Mixing and pelletizing machine
AU509477B2 (en) * 1977-09-05 1980-05-15 Gousti International Ltd. Mixing apparatus
US4305673A (en) * 1980-03-25 1981-12-15 General Signal Corporation High efficiency mixing impeller
JPS5724624A (en) * 1980-07-18 1982-02-09 Shozo Urashi Vapor-liquid contact apparatus
JPS5759625A (en) * 1980-09-29 1982-04-10 Yoichi Nagase Stirring blade
SE461444B (en) * 1985-11-21 1990-02-19 Boerje Skaanberg IMPELLER APPLIED FOR THE STIRRING OF FLUID DURING DISPERSION OF GAS THEREOF

Also Published As

Publication number Publication date
DE3782951T2 (en) 1993-07-08
EP0234768A3 (en) 1989-04-26
GB8603904D0 (en) 1986-03-26
HK1001041A1 (en) 1998-05-22
IE870279L (en) 1987-08-17
ATE83169T1 (en) 1992-12-15
CA1257196A (en) 1989-07-11
DE3782951D1 (en) 1993-01-21
AU580702B2 (en) 1989-01-27
NZ219280A (en) 1988-10-28
ES2037078T3 (en) 1993-06-16
ZA87882B (en) 1987-10-28
EP0234768A2 (en) 1987-09-02
JPS62193635A (en) 1987-08-25
AU6876487A (en) 1987-08-20
EP0234768B1 (en) 1992-12-09

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