EP3174624A1 - Verfahren und vorrichtung zur dosierung und einmischung wenigstens eines fluiden mediums in einen prozessstrom - Google Patents
Verfahren und vorrichtung zur dosierung und einmischung wenigstens eines fluiden mediums in einen prozessstromInfo
- Publication number
- EP3174624A1 EP3174624A1 EP15739548.4A EP15739548A EP3174624A1 EP 3174624 A1 EP3174624 A1 EP 3174624A1 EP 15739548 A EP15739548 A EP 15739548A EP 3174624 A1 EP3174624 A1 EP 3174624A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- process stream
- fluid
- fluidic
- mixing
- oscillators
- 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- Withdrawn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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/18—Carbonates
- C01F11/181—Preparation of calcium carbonate by carbonation of aqueous solutions and characterised by control of the carbonation conditions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/0072—Crystallisation in microfluidic devices
-
- 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
- B01F25/30—Injector mixers
- B01F25/31—Injector mixers in conduits or tubes through which the main component flows
- B01F25/314—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/71—Feed mechanisms
- B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
- B01F35/71755—Feed mechanisms characterised by the means for feeding the components to the mixer using means for feeding components in a pulsating or intermittent manner
Definitions
- the invention relates to a method and a device for metering and mixing at least one fluid medium into a process stream which is used in particular for producing a fibrous or nonwoven web. Dosing and subsequent mixing of chemicals into the papermaking process are subject to special requirements. In this case, the amounts of chemicals can be reduced to a considerable extent with an efficient mixing and a needs-based dosage such as an addition dependent on the amount of pulp.
- the invention is therefore based on the object of specifying a method and a device of the type mentioned, with which the most efficient and cost-effective chemical dosing and -einmischung in a process stream, in particular a process stream of a process for producing a fiber or nonwoven web can be achieved ,
- a dependent on the process stream for example, depending on the consistency and / or state of charge, dependent volume-controlled metering in particular a fluid process and / or functional chemical is to be made possible.
- the object is achieved by a method having the features of claim 1 and a device having the features of claim 10.
- Preferred embodiments of the method according to the invention and preferred embodiments of the device according to the invention are specified in the subclaims.
- the process according to the invention for metering and mixing at least one fluid medium into a process stream which is used in particular for producing a fiber or nonwoven web is characterized in that at least one fluid medium is injected into the process stream via a fluidic oscillator.
- Fluidic oscillators are already known as such and may in particular each comprise a nozzle, a mixing chamber and return flow channels. Fluidic oscillators or fluidic oscillators are characterized by a self-excited oscillation in their interior, which manifests itself either in an oscillating free jet at the output of the component or by a periodic switching between two discrete outlets.
- the resulting jet When fluid is applied to the component, the resulting jet automatically lays on one side in the mixing chamber. Downstream of the mixing chamber, the jet bounces against a wall and splits into two streams. The main flow leaves the component through one of the outlets. The second stream is passed through one of the so-called return flow channels and arrives the nozzle on the main stream and pushes it to the opposite wall in the mixing chamber.
- Fluidic oscillators offer the potential for high mixing without increasing pressure or having to use moving parts. They produce at their outlet a periodically oscillating beam. Possible embodiments of such fluidic oscillators are also described, for example, in EP 0 319 594 B1. By using one or more such fluidic oscillators, a more efficient metering and mixing of chemicals into the process stream is possible, which in particular also minimizes the costs for energy, raw materials, fresh water and chemicals.
- at least one fluid medium injected into the process stream via a fluidic oscillator contains at least one chemical.
- fluid media are injected into the process stream via at least one arrangement of in each case at least two fluidic oscillators.
- the fluid oscillators of a respective fluid oscillator arrangement are preferably arranged relative to one another such that their exit beams are pivoted in different planes.
- the mixing is further optimized.
- fluid media can be injected into the process stream, which are arranged relative to each other so that their exit beams are pivoted in orthogonal planes.
- the two fluidic oscillators a corresponding fluidic oscillator arrangement relative to each other, for example, be arranged so that the exit jets are pivoted in a vertical and in a horizontal plane.
- fluid media are injected into the process stream via at least one arrangement of more than two fluid oscillators in each case.
- the fluid oscillators are preferably arranged relative to one another such that their exit jets are pivoted in different planes.
- fluid media are injected into the process stream over a plurality of circumferentially distributed around the process flow fluid oscillators and / or fluid oscillator arrangements of a plurality of fluidic oscillators fluid.
- At least one fluid medium is injected into the process stream via a combination of a mixing nozzle and at least one fluidic oscillator.
- a mixing nozzle for example, an arrangement of at least two fluid generators can be used in combination with a mixing nozzle, wherein, for example, a chemical is previously mixed with a carrier fluid and then applied prior to metering to eg one or more fluid oscillators arranged at an angle to each other.
- the chemical to be metered for example premixed in a carrier fluid can be mixed in an oscillating manner in another fluid stream.
- the mixing nozzle is preferably connected upstream of the fluidic oscillator.
- the mixing nozzle is supplied with at least two fluids and mixed and / or reacted with one another in this mixture.
- the device according to the invention for metering and mixing at least one fluid medium into a process stream which in particular serves to produce a fibrous or nonwoven web is correspondingly characterized in that it comprises at least one fluid oscillator for injecting at least one fluid medium into the process stream.
- At least one fluid medium which can be injected into the process stream via such a fluidic oscillator contains at least one chemical.
- this device comprises at least one arrangement of at least two fluidic oscillators for the injection of fluid media into the process stream.
- the fluid oscillators of a respective fluid oscillator arrangement are preferably arranged relative to one another such that their exit beams are pivoted in different planes.
- the device may in particular comprise at least one arrangement of two fluidic oscillators for the injection of fluid media into the process stream, which are arranged relative to each other so that their exit jets in orthogonal planes, for example in a horizontal and a vertical plane, are pivoted.
- the device comprises at least one arrangement of more than two fluidic oscillators for the injection of fluid media into the process stream, the relative in particular are arranged so that their exit jets are pivoted in different planes.
- the device comprises a plurality of circumferentially distributed around the processor fluid oscillators and / or fluid oscillator arrangements of a plurality of fluidic oscillators for the injection of fluid media in the process stream.
- this comprises at least one combination of a mixing nozzle and at least one fluidic oscillator for injecting a fluid medium into the process stream.
- the mixing nozzle is preferably connected upstream of the fluidic oscillator.
- At least two fluids can be fed to the mixing nozzle and can be mixed with one another and / or reacted in the mixing nozzle.
- the mixing nozzles can be designed, for example, as described in DE 10 2010 028 573 A1 or DE 10 2010 028 572 A1.
- At least one fluid medium and one fluid chemical can be metered and mixed into a process stream by means of the method or device according to the invention.
- the process stream may in particular be a fluid process stream of a production process, preferably a process for producing a fiber or nonwoven web.
- a metered addition of a fluid medium diluted in a dilution medium for example a process or functional chemical or a partial fluid stream, may be mixed in a mixing nozzle.
- the fluid medium can be passed into a fluidic oscillator and then metered into the process stream, ie the further fluid stream.
- only one fluid can be metered by means of a fluidic oscillator or by means of a combination of a mixing nozzle and at least one fluidic oscillator.
- the outflow of a fluidic oscillator can, for example, be arranged perpendicularly or transversely to the fluid flow of the fluid flow into which the mixture flows.
- several combinations of mixing nozzle and fluidic oscillator can be arranged, for example, around a pipeline.
- the penetration of the process stream can be adjusted.
- the energy required for metering can be adjusted controllably, so that the metering process can be performed energy-efficiently.
- the entire process stream for producing a paper or nonwoven web for example a fibrous or nonwoven suspension
- the fluid process or functional chemical is mixed with the process stream .
- the fluid chemical may also be a mixture of process and functional chemical.
- it may be a solid suspended in a fluid medium, such as a filler slurry.
- the outlet nozzles of the fluidic oscillator can in particular be arranged in such a way that they cover at least part of a circular arc (arc length) on a cylindrical, curved surface, for example a pipeline, wherein in the case of a plurality of juxtaposed openings, one circular segment can be covered by a respective nozzle arrangement and thus a complete annular arrangement around the cylindrical circumference of a pipe through a corresponding number of nozzle arrangements (fluidic oscillators) is given.
- the metering streams can be very efficiently mixed with the entire process stream.
- a particular partial stream may be part of the process stream itself. However, it may also be, for example, other process streams, such as e.g. White water, or filtrates, such as clear filtrate or super clear filtrate or also fresh water, e.g. Hot water, act.
- process streams such as e.g. White water, or filtrates, such as clear filtrate or super clear filtrate or also fresh water, e.g. Hot water, act.
- the chemical to be metered may be, for example, a retention agent, for example polyacrylamide (PAM), polyethyleneimine (PEI), polyamidoamine (PAAm), crosslinkable polyamidoamine resins, PolyDADMAC, polyvinylamine (PVAm) or polyethylene oxide (PEO).
- PAM polyacrylamide
- PEI polyethyleneimine
- PAAm polyamidoamine
- PDADMAC polyvinylamine
- PVAm polyvinylamine
- PEO polyethylene oxide
- the chemical to be metered may also be, for example, a microparticle or nanoparticle, e.g. Concrete or a silicate.
- the chemical to be dosed may be starch or a biocide, or e.g. to act a dye or an optical brightener.
- the chemical may be neutralizing agents, e.g. AKD (alkyl ketene dimer) or ASA (alkenyl succinic anhydride) act.
- AKD alkyl ketene dimer
- ASA alkenyl succinic anhydride
- the chemicals to be dosed may generally be all chemicals and additives used in papermaking in particular fluid form (solution, dispersion or suspension) can be brought.
- a gas can also be metered in addition to a fluid flow or a plurality of further fluid flows.
- the flow rate in the feed device for example, of the partial fluid flow or the chemical metering flow is expediently to be chosen so high that no deposits can form.
- the flow rate may in particular be in the range of 0.05 to 20 m / s, preferably in the range of 0.1 to 10 m / s and especially in the range of 0.1 to 5 m / s.
- a particular combination of mixing nozzle and fluidic oscillator can be used with advantage in particular also for generating a precipitation reaction with subsequent metering.
- the combination of mixing nozzle and fluidic oscillator is not limited to the exclusive dosage of liquid, fluid chemicals.
- a gas such as e.g. CO2 and e.g. Hydrated lime, e.g. as a suspension (milk of lime, slurry of calcium hydroxide in water) or as lime water to be reacted.
- the solubility of hydrated lime Ca (OH) 2 in water is only 1.7 g / l at 20 ° C., the solubility decreasing as the temperature increases.
- a Kalkmilchsuspension is used, which then has a much higher concentration of, for example, 30 to 150 g / l of Ca (OH) 2 .
- carbonic acid water may also be brought in the combination of the mixing nozzle and the fluidic oscillator in reaction with a slurry of lime (lime milk) or an aqueous solution of hydrated lime.
- a slurry of lime lime milk
- an aqueous solution of hydrated lime aqueous solution of hydrated lime.
- the suspension can be adjusted immediately to the use concentration. It is also conceivable, for example, to adjust the use concentration directly in the combination of mixing nozzle and fluidic oscillator prior to contact with the CO2 by mixing in another dilution fluid in an upstream mixing zone.
- a filter is connected upstream in the feed to the combination of mixing nozzle and fluidic oscillator, so that insoluble constituents are retained in order to prevent clogging of the metering system.
- filters can be dispensed with.
- the flow rate should expediently not fall below 1, 0 m / s and preferably greater than 1, 5 m / s are selected.
- the dosage of lime from a loop system is advantageous to avoid deposits in the piping system.
- a hydrated lime suspension (lime milk) special requirements are placed on the particle size distribution and grain size, as these parameters significantly influence the reactivity of the milk of lime.
- the particle size distribution should be as homogeneous as possible in order to allow the precipitation of calcium carbonate achieved in the reaction with carbon dioxide to proceed efficiently.
- a precipitation reaction occurs, for example through the reaction of milk of lime and carbon dioxide, whereby the precipitated calcium carbonate thus produced can be metered into the process stream by means of a further fluid stream (injection stream) or the preferably aqueous phase of the lime milk.
- injection stream the precipitation reaction and the metering into the process stream can take place simultaneously.
- the dwell or reaction time can be adjusted by the geometry of the corresponding zone.
- the execution of a possible combination in the reaction mixing zone can be made of a plurality of bores with a preferably relatively small diameter.
- the (primary) precipitation reaction of the calcium carbonate outside the process stream or the constant part of the paper machine preferably takes place in the combination of mixing nozzle and fluid oscillator, so that the process of the precipitation reaction can be influenced by the choice of the injection medium.
- calcium carbonate can be provided due to the precipitation reaction in the combination of mixing nozzle and fluidic oscillator, which is dosed into a process stream.
- the precipitation reaction to the pulp contained in the partial fluid flow can already take place in the combination of mixing nozzle and fluid oscillator.
- the combination of mixing nozzle and fluidic oscillator for example, the The following different forms of application of calcium carbonate are provided:
- the pH or other parameters e.g. the temperature of the injection fluid with respect to reaching optimum precipitation conditions in a mixing zone upstream of the precipitation reaction of the same combination of mixing nozzle and fluidic oscillator can be adjusted.
- a reaction of the carbon dioxide and the milk of lime outside the process stream already takes place in the mixing reaction / nozzle arrangement.
- the already precipitated in the combination of mixing nozzle and fluidic oscillator on the fibers of the suspension of the partial flow calcium carbonate (primary reaction) is then metered into the process stream.
- the reaction of the milk of lime and the carbon dioxide in the combination of mixing nozzle and fluidic oscillator can be done much more selectively by changing the mixing conditions, as in the process stream even possible.
- the bubble size and the number of gas bubbles of the carbon dioxide can be adjusted by means of the bore diameter and the number of holes in the combination of mixing nozzle and fluidic oscillator (mixing zone).
- unreacted milk of lime or unreacted CO2 can then react completely with one another during the secondary reaction in the process stream. Due to the geometry of the communication from the mixing nozzle and the fluidic oscillator, the necessary reaction time can be considerably reduced, so that the actual primary reaction (primary reaction) is completed in less than 3 s, preferably less than 1 s.
- the precipitation reaction can be controlled by means of the size of the gas bubbles and the efficiency can be increased.
- the efficiency of the conversion of milk of lime and CO 2 can be significantly increased.
- the homogeneity of the precipitated calcium carbonate can be adjusted by the geometry of the combination of mixing nozzle and fluidic oscillator and the mixing parameters.
- the crystal structure of the precipitated calcium carbonate in terms of the required paper properties for example, in terms of opacity and light scattering and the bulk, etc., can be influenced.
- FIG. 1 is a schematic representation of an exemplary embodiment of a fluidic oscillator of a device according to the invention
- FIG. 2 is a schematic representation of an exemplary arrangement of two fluidic oscillators of a device according to the invention
- Fig. 3 is a schematic representation of an exemplary arrangement of three
- FIG. 4 is a schematic representation of an exemplary embodiment of a device according to the invention with a plurality of circumferentially distributed around the process flow fluid oscillator arrangements
- FIG. 5 shows a schematic representation of an exemplary combination of a mixing nozzle and a fluidic oscillator of a device according to the invention
- FIG. 6 shows a schematic illustration of an exemplary embodiment of a mixing nozzle of a device according to the invention
- FIG. 7 shows a schematic illustration of a further exemplary embodiment of a mixing nozzle of a device according to the invention
- FIG. 8 shows a schematic illustration of a further exemplary embodiment of a mixing nozzle of a device according to the invention
- FIG. 9 is a schematic representation of another exemplary embodiment of a mixing nozzle of a device according to the invention.
- FIG. 10 shows a schematic illustration of a further exemplary embodiment of a mixing nozzle provided with a shut-off device
- Device according to the invention. 1 shows a schematic representation of an exemplary embodiment of a fluidic oscillator 10 of a device according to the invention for metering and mixing at least one fluid medium into a process stream 12 serving in particular for producing a fibrous or nonwoven web (compare also FIG.
- the fluidic oscillator 10 comprises a nozzle 14, a mixing and / or reaction chamber 16 and return flow channels 18.
- the fluidic oscillator 10 is characterized by a self-excited oscillation in its interior, which manifests itself in an oscillating free jet at its outlet 20.
- FIG. 2 shows a schematic representation of an exemplary arrangement 22 of two fluidic oscillators 10 of the device according to the invention, which are arranged relative to each other such that their exit beams 24 are pivoted in orthogonal planes 26, 26 ', here for example in a horizontal and a vertical plane.
- FIG. 3 shows a schematic representation of an exemplary arrangement 22 of three fluidic oscillators 10 for injecting fluid media into the process stream 12, which are arranged relative to one another such that their exit jets 24 are pivoted in three different planes 26, 26 ', 26 ".
- FIG. 4 shows a schematic representation of an exemplary embodiment of the device according to the invention with a plurality of circumferentially distributed around the process stream 12 and a process pipe 12 leading pipe 28 fluid oscillator assemblies 22.
- the fluid oscillator assemblies 22 in the present case, for example, each two fluidic oscillators 10 for the injection of fluid media in the process stream 12, which are arranged relative to each other so that their exit jets 24 are pivoted in orthogonal planes.
- Fig. 5 shows a schematic representation of an exemplary combination of a mixing nozzle 32 and a fluidic oscillator 10 of the device according to the invention.
- the fluidic oscillator 10 has the same structure as the fluidic oscillator already described with reference to FIG. 1, wherein like reference numerals are assigned to corresponding parts.
- the mixing nozzle 32 essentially comprises two nozzles 34, 36, which inject a first fluid 1 and a second fluid 3 into the fluidic oscillator 10.
- the outlet openings of the two nozzles 34, 36 are in the present case, for example, in a plane, wherein the outlet opening of the nozzle 36 is located within the outlet opening of the nozzle 34.
- Fig. 6 shows in a schematic representation again a mixing nozzle 32 of the type, as has already been described with reference to FIG. 5. Corresponding parts are assigned the same reference numerals.
- the transition region to the (not shown here), the fluidic oscillator 10 is designated in the present illustration with 38.
- the first fluid 1 may be a partial fluid flow and the second fluid 3 may be, for example, a chemical dosing flow.
- 7 shows a schematic representation of another exemplary embodiment of a mixing nozzle 32 of the device according to the invention, which differs from the mixing nozzle 32 shown in FIG. 6 only in that the nozzle 36 for the second fluid 3 passes through the nozzle opening of the nozzle 34 extends into the (not shown), the fluidic oscillator 10. Corresponding parts are assigned the same reference numerals.
- Fig. 8 shows a schematic representation of another exemplary embodiment of a mixing nozzle of the device according to the invention, in addition to the nozzles 34 and 36 for injection of the fluid formed for example by a Partialfluidstrom 1 and the example formed by a chemical dosing Fluid 3 in the (not shown) the fluidic oscillator 10 further nozzles 40, 42 for injecting a further fluid formed for example by a Partialfluidstrom 2 or a further example formed by a chemical stream 4 further fluid 4 in the fluidic oscillator 10 includes.
- the outlet openings of all the nozzles 34, 36, 40, 42 lie in a plane in the region of the transition to the fluidic oscillator 10.
- FIG. 9 shows a schematic representation of another exemplary embodiment of a mixing nozzle 32, which differs substantially from the mixing nozzle 32 described with reference to FIG. 8 only in that the nozzles 36 and 42 extend beyond the plane of the transition 38 into the fluid oscillator 10 into it. Corresponding parts are assigned the same reference numerals.
- FIG. 10 shows a schematic representation of another exemplary embodiment of a mixing nozzle 32 of the device according to the invention.
- the mixing nozzle 32 comprises a first flow channel 44, a second flow channel 46, which surrounds the first flow channel in an annular manner, and a third flow channel 48, which surrounds the second flow channel 46 in an annular manner.
- the inner flow channel 44 extends through the outlet opening of the flow channel 46 into a mixing chamber 50 in which the fluids supplied via the flow channels 44 to 48 are premixed prior to injection into the fluidic oscillator 10.
- a mixture of a chemical e.g. two other fluids are premixed in at least one mixing chamber 50 and the mixture is then injected into the fluidic oscillator 10 and a fluidic oscillator assembly 22, respectively.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Accessories For Mixers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014214807 | 2014-07-29 | ||
PCT/EP2015/066024 WO2016015991A1 (de) | 2014-07-29 | 2015-07-14 | Verfahren und vorrichtung zur dosierung und einmischung wenigstens eines fluiden mediums in einen prozessstrom |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3174624A1 true EP3174624A1 (de) | 2017-06-07 |
Family
ID=53716459
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP15739548.4A Withdrawn EP3174624A1 (de) | 2014-07-29 | 2015-07-14 | Verfahren und vorrichtung zur dosierung und einmischung wenigstens eines fluiden mediums in einen prozessstrom |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3174624A1 (de) |
WO (1) | WO2016015991A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB201810407D0 (en) * | 2018-06-25 | 2018-08-08 | Queens Univ Of Belfast | Crystallisation method and apparatus |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4231519A (en) * | 1979-03-09 | 1980-11-04 | Peter Bauer | Fluidic oscillator with resonant inertance and dynamic compliance circuit |
DE102010028572A1 (de) | 2010-05-05 | 2011-11-10 | Voith Patent Gmbh | Verfahren zur Zumischung einer flüssigen Chemikalie zu einem Prozessstrom und Vorrichtung |
DE102010028573A1 (de) | 2010-05-05 | 2011-11-10 | Voith Patent Gmbh | Mischverfahren |
DE102010017523A1 (de) * | 2010-06-22 | 2011-12-22 | Technische Universität Berlin | Verfahren und Mischvorrichtung zum Mischen von zwei Fluiden sowie deren Verwendung |
-
2015
- 2015-07-14 WO PCT/EP2015/066024 patent/WO2016015991A1/de active Application Filing
- 2015-07-14 EP EP15739548.4A patent/EP3174624A1/de not_active Withdrawn
Non-Patent Citations (2)
Title |
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None * |
See also references of WO2016015991A1 * |
Also Published As
Publication number | Publication date |
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WO2016015991A1 (de) | 2016-02-04 |
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