WO2008113519A1 - Disperseur à jet - Google Patents

Disperseur à jet Download PDF

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Publication number
WO2008113519A1
WO2008113519A1 PCT/EP2008/002053 EP2008002053W WO2008113519A1 WO 2008113519 A1 WO2008113519 A1 WO 2008113519A1 EP 2008002053 W EP2008002053 W EP 2008002053W WO 2008113519 A1 WO2008113519 A1 WO 2008113519A1
Authority
WO
WIPO (PCT)
Prior art keywords
gap
jet disperser
piston
process space
process chamber
Prior art date
Application number
PCT/EP2008/002053
Other languages
German (de)
English (en)
Other versions
WO2008113519A8 (fr
Inventor
Frank Herbstritt
Olaf Behrend
Original Assignee
Bayer Technology Services Gmbh
Ehrfeld Mikrotechnik Bts Gmbh
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 Bayer Technology Services Gmbh, Ehrfeld Mikrotechnik Bts Gmbh filed Critical Bayer Technology Services Gmbh
Priority to AT08716547T priority Critical patent/ATE516874T1/de
Priority to EP08716547A priority patent/EP2129454B1/fr
Publication of WO2008113519A1 publication Critical patent/WO2008113519A1/fr
Publication of WO2008113519A8 publication Critical patent/WO2008113519A8/fr

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
    • B01F23/40—Mixing liquids with liquids; Emulsifying
    • B01F23/41—Emulsifying
    • 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
    • B01F23/50—Mixing liquids with solids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/20—Jet mixers, i.e. mixers using high-speed fluid streams
    • B01F25/23—Mixing by intersecting jets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/44—Mixers in which the components are pressed through slits
    • B01F25/441—Mixers in which the components are pressed through slits characterised by the configuration of the surfaces forming the slits
    • B01F25/4412—Mixers in which the components are pressed through slits characterised by the configuration of the surfaces forming the slits the slits being formed between opposed planar surfaces, e.g. pushed again each other by springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/44—Mixers in which the components are pressed through slits
    • B01F25/442—Mixers in which the components are pressed through slits characterised by the relative position of the surfaces during operation
    • B01F25/4422—Mixers in which the components are pressed through slits characterised by the relative position of the surfaces during operation the surfaces being maintained in a fixed but adjustable position, spaced from each other, therefore allowing the slit spacing to be varied

Definitions

  • the invention relates to a jet disperser with which fluid media can be mixed particularly finely and liquid mixtures subjected to high shear stresses, e.g. to produce finely dispersed emulsions or suspensions.
  • One method of producing particularly finely dispersed emulsions and suspensions is to pre-admix the starting components of the dispersion and to promote the resulting predispersion at high pressure through one or more narrow orifices (nozzles). It is known that the pressure drop and thus the specific energy input via the nozzle or the nozzle system, which is required to achieve a certain dispersing result, decreases in most cases while reducing the characteristic dimensions (for example hydraulic diameter) of the nozzle used. In order to efficiently disperse larger mass flows, it is therefore preferable to resort to systems with many particularly fine openings through which they flow in parallel. Furthermore, in order to realize a good dispersing result with low expenditure of energy with a given dispersing effect even with variable mass flows of the starting materials, some dispersing apparatuses are also equipped with a device for varying the number of apertures through which they flow.
  • EP 0 685 544 discloses a jet disperser in which the fluids to be mixed pass through radially extending bores into a process space.
  • the bores can be completely or partially closed by means of an axially displaceable tube or piston guided inside the process chamber, in order to adapt the number of bores through to the desired pressure and throughput, whereby a good fine mixing of the fluid media is to be achieved.
  • a disadvantage of such a jet disperser is that the total cross section of the openings through which flows through can no longer be varied continuously but only gradually in the case of small mass flows and is ultimately limited by the minimum achievable bore cross section. It is also associated with high technical effort, very many holes with diameters well below 0.1 mm, as they would be desirable for many applications, to bring into the walls of the process chamber, which at the same time not due to the high pressure loads have to have insignificant strength. Finally, during operation, the piston, which closes the nozzle openings in the wall of the process chamber, has high forces in the direction of its axis of motion, which must be held by a suitable device in order to prevent undesired displacement of the piston. It is thus at least extremely difficult to produce particularly finely dispersed emulsions and suspensions in processes with varied or fluctuating flow rates with low energy consumption.
  • the jet disperser according to the invention for fine mixing or dispersion of fluid media has a housing in which a process space for mixing the fluid media is arranged, which is in communication with a Zu-Abzhoukanal for a fluid medium. At least two columns extending substantially perpendicularly to the longitudinal axis of the process space, which are each also in connection with at least one further in-discharge channel for a fluid medium, respectively open into the process space via a gap opening substantially radially.
  • a rotatable about a rotation axis piston which carries at the level of the stomata an arrangement of openings with connection to the process space such that the stomata are closed depending on the angular position of the piston to a greater or lesser extent by the piston.
  • the gap in the circumferential direction relative to the height is made relatively wide, since the gap opening can be reduced by the piston to a particularly small passage cross section, wherein the outlet cross section in a first application at the right end of can be located on the right side and in a second application at the left end of a gap, so that despite occurring signs of wear, the life of the Beam disperser can be extended. Due to the possibility of setting a particularly small outlet cross section, extremely high shear forces can be achieved even at relatively low pressure drops via the jet disperser, which lead to a particularly fine dispersion of the fluid media.
  • the jet disperser according to the invention can be easily adapted to different system and process parameters, such as, for example, pressure or mass flow of educt fluids. This can also be done automatically with the aid of a control loop.
  • the columns of a preferred embodiment can be formed by two housing parts in the jet disperser according to the invention, it is possible with little manufacturing effort to provide gaps which have an extremely low height in the axial direction. For example, it is possible to mill recesses of a few micrometers in depth into one of the housing parts along the abutting edge adjacent to the process space, or by other manufacturing techniques such as grinding, lapping or forming sets, which then cover by a counter surface of the second Housing part define the dispersing column towards the process room. Elaborate microfabrication techniques are in principle not required for this.
  • the gap height of the at least two columns is adjusted by spacers which are arranged between the two housing parts, between which the gaps are formed.
  • the gap height can be set variably depending on the application.
  • the spacers are designed in the form of a foil, so that it is possible to produce gaps with a gap height of a few micrometers by using preferably metallic or polymeric foils with a layer thickness of a few micrometers thick.
  • the two housing parts are connected to each other in such a way that leaks even at high pressures up to, for example, 200 bar are avoided.
  • self-reinforcing elastomer seals are provided between the housing parts.
  • the piston can be determined in particular steplessly in its angular position, so that the size of the opening into the process space gap openings of the columns variable - preferably from near zero to its full length - can be adjusted.
  • the locking of the angular position of the piston can take place with a comparatively simple device (for example locking screw, clamping jaws), since only very small pressure forces act on the piston during operation of the jet disperser in its direction of movement. It is thus also possible to adjust the angular position of the piston during operation of the jet disperser with little effort.
  • the adjustment of the angle of the piston by hand so this preferably takes place by means of a transmission with over- or reduction, so that the piston with high accuracy and reproducibility - preferably of about 2%, more preferably less than 0.5% of Angular opening of the column - can be positioned in a certain angular position.
  • the piston has a protruding lever, wherein the lever can be locked.
  • a rotary head or the like may be provided.
  • the lever or knob cooperates with a scale, so that the angular position of the piston can be read on the jet disperser.
  • a motorized adjustment of the angular position of the piston e.g.
  • jet disperser by a mechanical, electrical, magnetic, pneumatic or hydraulic drive.
  • a mechanical, electrical, magnetic, pneumatic or hydraulic drive Such an embodiment of the jet disperser according to the invention is particularly preferable if the angular position of the piston is to be defined via a control loop, e.g. to keep the pressure drop across the jet disperser or other process characteristic constant with varying media streams or media properties.
  • the arrangement of the gaps and in particular of the gap openings to the process chamber in a common plane perpendicular to the axis of rotation of the piston and the openings in the piston are in this plane in direct (ie straight) connection.
  • the stomata of the gaps are arranged in pairs opposite to each other.
  • an even number of columns is therefore preferably provided.
  • the flow rate of at least one of the fluids may be split into two columns.
  • the width of the stomata is preferably the same for all columns and the piston or the openings therein are preferably shaped such that in each angular position of the piston of each stomata each same portion is closed. This is achieved, for example, in that the edges of the areas of the piston covering the stomata openings are at the same angular positions with respect to one another as the corresponding end edges of the respectively concealed stomata.
  • the gaps are preferably respectively connected to supply channels in order to be charged with the fluid media to be supplied, while the process chamber is connected to a discharge for the fluidic product.
  • This mode of operation of the jet dispersant according to the invention is particularly suitable, for example, for producing emulsions having approximately equal proportions of the oil and water phases, e.g. in the manufacture of cosmetics, detergents and cleaners, lubricants, in continuous extraction processes, or in the performance of phase transfer reactions, e.g. in the emulsion polymerization or the production of core-shell particles.
  • solid particles, in particular nanoparticles can also be advantageously produced by precipitation from two or more reactive fluid starting materials with the jet disperser according to the invention.
  • the first gap and the second gap can also be acted on by the same medium to be supplied, while the process space is connected to a drain for the fluidic product.
  • This mode of operation is suitable, for example, for the homogenization of emulsions or the comminution of solid particles or aggregates in fluid media.
  • one of the columns and the process space are each supplied with a fluid medium to be supplied and another gap is connected to a drain, via which the mixture formed in the process space flows.
  • This mode of operation is particularly preferred when the fluid medium fed into the process space has a significantly higher volume flow or a substantially different viscosity than the fluid medium supplied via the gap or if a two-stage dispersion is required to achieve a desired mixing or dispersion result (or mixing and homogenization) is necessary, especially if in this case the product of the predispersing is particularly unstable.
  • this operating mode since the fluid medium supplied via the gap is admixed with the medium supplied in the process space with the participation of high shear and inertial forces, predispersion is achieved in the process space.
  • the thus predispersed medium is additionally dispersed or homogenized by the subsequent outflow via the second gap.
  • the residence time of the mixture between the two dispersion steps can be kept extremely short by using a very small process chamber volume.
  • the media to be supplied can have a pressure of 10 to 200 bar or even more.
  • the gap height is preferably 5 ⁇ m to 200 ⁇ m, more preferably 10 ⁇ m to 100 ⁇ m.
  • the process space has orthogonal to the axis of rotation an effective diameter of in particular 0.2 mm - 10 mm, preferably 0.4 mm - 5 mm and particularly preferably 1 mm to 2.5 mm.
  • the effective diameter of the process space results in a possibly not completely round cross-sectional area in that the diameter of a circular area with a
  • Fig. 1a is a schematic sectional view of a device according to the invention
  • FIG. Ib is a schematic cross-sectional view of that shown in Fig. Ia
  • FIG. 1 c shows a schematic sectional view of the jet disperser shown in FIG. 1 a in a second operating mode
  • Fig. Id is a schematic cross-sectional view of that shown in Fig. Ic
  • Fig. 2a is a schematic cross-sectional view of the invention
  • Fig. 2b is a schematic cross-sectional view of that shown in Fig. 2a
  • Fig. 2c is a schematic cross-sectional view of that shown in Fig. 2a
  • Fig. 2d is a schematic cross-sectional view of that shown in Fig. 2a
  • Jet disperser in a fourth mode of operation.
  • An inventive jet disperser shown in FIG. 1a has a housing made of the housing parts 7, 9, 10, in which a process space 1 is formed.
  • the discharge channel 4 can also be operated as a feed channel and is therefore further referred to as the discharge channel 4.
  • the housing has a first housing part 7 and a second housing part 9, between which by means of spacers 8 (in the illustrated embodiment, the spacers are a spacer film) columns 2a and 2b are formed.
  • the gaps 2a, 2b are each acted upon by channels 3a, 3b with a fluid medium to be mixed.
  • These channels can also be operated to supply channels or discharge channels and Therefore, either Zu-Abrioskanäle or depending on the operating mode supply or discharge channels further called.
  • a piston 5 is arranged axially, which is rotatably mounted about a rotation axis 6.
  • the storage is via a bearing 11, which may be, for example, a plain bearing.
  • the bearing 1 1 is arranged in the illustrated embodiment in a third housing part 10.
  • the rotatable piston 5 has, at the level of the gaps 2a and 2b, an opening which communicates with the process space 1 (FIG. 1b).
  • the gap openings of the first gap 2a and of the second gap 2b opening into the process space 1 can be partially closed in order to adjust a gap opening adapted to the mass flow of the media to be dispersed.
  • the particularly small height of the stomata which can be set independently of the gap width, high shear and inertial forces occur in the gap and at the outlet, which cause a particularly finely dispersed emulsion or a high particle or agglomeration comminution in suspensions.
  • the medium dispersed in the process space 1 emerges after mixing via the inlet-to-discharge channel 4 connected to the process space 1.
  • the gaps 2a, 2b are the same width (measured along the circumference of the process space) in order to achieve the simplest possible geometry of the jet disperser.
  • the spacer foil 8 contains columns 2a, 2b of different lengths. In this case, it is sufficient to turn the spacer film 8 in order to connect, with the aid of the longer-running gaps 2a, 2b, previously closed in-discharge channels 3a, 3b which open at a greater radius into the longer-running gaps 2a, 2b.
  • the connection opening of the piston 5 can connect fewer columns 2a, 2b to the process space 1 than total columns are present.
  • FIGS. 1 a and 1b In the operating mode shown in FIGS. 1 a and 1b, two different or identical educts are fed via the feed and discharge ducts 3 a, 3 b and the gaps 2 a, 2 b, respectively, which are mixed or dispersed in the process space 1.
  • This operating mode is particularly suitable when the volume flows of the media to be supplied are about the same size or when a solid product is precipitated during the mixing of the media. Since the supplied media are aligned in the connecting opening of the piston 5 to one another, a particle agglomeration of the precipitated solids or the solid particles already contained in the supplied streams is avoided or the existing particles or emulsion drops are even crushed.
  • FIGS. 1 c and 1 d In the operating mode shown in FIGS. 1 c and 1 d, the same jet disperser shown in FIGS. 1 a and 1 b is used. In comparison with the operating mode illustrated in FIGS. 1 a and 1 b, in the operating mode illustrated in FIGS. 1 c and 1 d, the connection of the in-discharge duct 3 b or the gap 2 b and the in-exhaust duct 4 is interchanged.
  • an educt which is dispersed in the process space 1 and is discharged via the gap 2 a is fed via the inlet-discharge channel 4 and the inlet-discharge channel 3 a or gap 2 a, the transition from the gap 2 b into the inlet-discharge channel 3 d a further dispersion takes place.
  • This mode of operation is particularly suitable if an educt with a low volume flow to the educt with a high volume flow, which is supplied via the to-discharge channel 4, to be mixed, or if between the pre-mixing and the dispersion or Homogenization a particularly short residence time should be realized.
  • this operating mode is preferably suitable for processing reactive multiphase systems, since a reaction can take place only during the mixing of the fluids in the process space and only a short contact time is present until further dispersion or homogenization of the product mixture.
  • Both in the operating mode shown in Fig. Ia and Fig. Ib and in the operating mode shown in Fig. I c and Fig. Id can be adjusted on the angular position of the piston 5, the size of the mouth opening of the columns 2a, 2b, so that also at varying volumetric flows, the inflow velocity, the pressure loss, the shear rate, etc. can be kept substantially constant.
  • a total of four gaps 2a, 2b, 2c, 2d are provided, each of which is acted upon by a different educt A, B, C, D.
  • the educts A, B, C, D mix in the process chamber 1 and are discharged as finely dispersed product P via the process chamber channel 4.
  • the number of columns 2a, 2b, 2c, 2d need not necessarily coincide with the number of reactants A, B, C, D to be supplied. It is even possible for all four columns 2a, 2b, 2c, 2d or even more columns to be charged with only one, for example, predispersed starting material.
  • a reactant D fed via the Zu-Abglasskanal 4 while the other educts A, B, C via the In-Aburbankanäle 3a, 3b, 3d and the respective columns are supplied.
  • the product P is discharged via the gap 2c and the to-discharge channel 3c.
  • one or more starting materials A, B, C, D it is possible for one or more starting materials A, B, C, D to be supplied via at least two gaps 2a, 2b, 2c, 2d or to the inflow and outflow duct 4 and at least one further gap 2a, 2c, 2d.

Abstract

L'invention concerne un disperseur à jet pour le mélange fin ou la dispersion de milieux fluides, qui présente un boîtier (7, 9, 10) dans lequel est disposée une chambre de traitement (1) pour le mélange des milieux fluides. Au moins deux fentes (2a, 2b) s'étendant sensiblement perpendiculairement à l'axe longitudinal de la chambre de traitement, qui sont chacune également en liaison avec au moins un autre canal d'entrée-sortie (3a, 3b) pour un milieu fluide, débouchent à chaque fois par l'intermédiaire d'une ouverture en fente sensiblement radialement dans la chambre de traitement. Dans la chambre de traitement, est mis en place un piston (5) apte à tourner autour d'un axe de rotation (6), lequel porte à hauteur des ouvertures en fente un agencement d'ouvertures avec liaison à la chambre de traitement (1) de telle sorte que les ouvertures en fente (2a, 2b) sont plus ou moins fermées par le piston, dans chaque cas selon la position de l'angle du piston (5), ce qui permet de faire varier la section d'embouchure des fentes (2a, 2b) de façon continue et avec une faible dépense d'énergie, et également d'obtenir, dans le cas de flux massiques variables des éduits, un mélange reproductible et notamment particulièrement fin ou une dispersion reproductible et notamment particulièrement fine des milieux fluides avec une faible dépense d'énergie est possible.
PCT/EP2008/002053 2007-03-22 2008-03-14 Disperseur à jet WO2008113519A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AT08716547T ATE516874T1 (de) 2007-03-22 2008-03-14 Strahldispergator
EP08716547A EP2129454B1 (fr) 2007-03-22 2008-03-14 Disperseur à jet

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007014487.5 2007-03-22
DE102007014487A DE102007014487A1 (de) 2007-03-22 2007-03-22 Strahldispergator

Publications (2)

Publication Number Publication Date
WO2008113519A1 true WO2008113519A1 (fr) 2008-09-25
WO2008113519A8 WO2008113519A8 (fr) 2009-09-11

Family

ID=39563450

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/002053 WO2008113519A1 (fr) 2007-03-22 2008-03-14 Disperseur à jet

Country Status (4)

Country Link
EP (1) EP2129454B1 (fr)
AT (1) ATE516874T1 (fr)
DE (1) DE102007014487A1 (fr)
WO (1) WO2008113519A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2993791B1 (fr) * 2012-07-27 2014-07-11 Eveon Distributeur fluidique et dispositif de reconstitution in situ et d'administration
DE102013213273A1 (de) 2013-02-22 2014-08-28 Bayer Materialscience Aktiengesellschaft Kohlenstoffnanoröhren-haltige Dispersion und ihre Verwendung in der Herstellung von Elektroden

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4105852C1 (en) * 1991-02-25 1992-06-04 Janke & Kunkel Gmbh & Co Kg Ika-Labortechnik, 7813 Staufen, De Dispersing device for long fibres - comprising tube enclosing shaft and rotor with three cutting edges, and slotted stator
EP0685544A1 (fr) * 1994-06-03 1995-12-06 Bayer Ag Emulsions aqueuses de vernis de polyuréthane à deux composants et procédé de leur préparation
DE19814267A1 (de) * 1997-09-25 1999-04-01 Ge Bayer Silicones Gmbh & Co Vorrichtung und Verfahren zur Herstellung von Siliconemulsionen
US20050072300A1 (en) * 2001-12-21 2005-04-07 Harald Linga Acid gas removal

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Publication number Priority date Publication date Assignee Title
GB2014278B (en) * 1977-11-29 1982-04-07 Toyo Water Machine Co Ltd Pressurized-liquids mixing device
DE19933441A1 (de) * 1999-07-16 2001-01-18 Bayer Ag Verstellbarer Strahldispergator zur Herstellung wäßriger 2-Komponenten-Polyurethanlack-Emulsionen
EP1333005A1 (fr) * 2002-02-01 2003-08-06 Aqamore GmbH Dispositif de mélange
DE10218280C1 (de) * 2002-04-19 2003-11-20 Fraunhofer Ges Forschung Integriertes Misch- und Schaltsystem für die Mikroreaktionstechnik
DE502005005027D1 (de) * 2004-02-17 2008-09-25 Ehrfeld Mikrotechnik Bts Gmbh Mikromischer
DE102005028291A1 (de) * 2005-06-18 2006-12-21 Bayer Materialscience Ag Homogenisierdüse und Verfahren zur Herstellung einer wässrigen Zweikomponenten-Polyurethan-Lackemulsion

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4105852C1 (en) * 1991-02-25 1992-06-04 Janke & Kunkel Gmbh & Co Kg Ika-Labortechnik, 7813 Staufen, De Dispersing device for long fibres - comprising tube enclosing shaft and rotor with three cutting edges, and slotted stator
EP0685544A1 (fr) * 1994-06-03 1995-12-06 Bayer Ag Emulsions aqueuses de vernis de polyuréthane à deux composants et procédé de leur préparation
DE19814267A1 (de) * 1997-09-25 1999-04-01 Ge Bayer Silicones Gmbh & Co Vorrichtung und Verfahren zur Herstellung von Siliconemulsionen
US20050072300A1 (en) * 2001-12-21 2005-04-07 Harald Linga Acid gas removal

Also Published As

Publication number Publication date
EP2129454A1 (fr) 2009-12-09
ATE516874T1 (de) 2011-08-15
DE102007014487A1 (de) 2008-10-09
WO2008113519A8 (fr) 2009-09-11
EP2129454B1 (fr) 2011-07-20

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