EP2353705A1 - Dispositif et procédé destiné à mélanger des dispersions et des gaz - Google Patents

Dispositif et procédé destiné à mélanger des dispersions et des gaz Download PDF

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Publication number
EP2353705A1
EP2353705A1 EP10001079A EP10001079A EP2353705A1 EP 2353705 A1 EP2353705 A1 EP 2353705A1 EP 10001079 A EP10001079 A EP 10001079A EP 10001079 A EP10001079 A EP 10001079A EP 2353705 A1 EP2353705 A1 EP 2353705A1
Authority
EP
European Patent Office
Prior art keywords
dispersion
gas
perforated plates
receptacle
mixing
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Withdrawn
Application number
EP10001079A
Other languages
German (de)
English (en)
Inventor
Dirk Dr. Achten
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Covestro Deutschland AG
Original Assignee
Bayer MaterialScience AG
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 MaterialScience AG filed Critical Bayer MaterialScience AG
Priority to EP10001079A priority Critical patent/EP2353705A1/fr
Priority to PCT/EP2011/051309 priority patent/WO2011095454A1/fr
Priority to EP11702438.0A priority patent/EP2531283B1/fr
Priority to TW100103808A priority patent/TW201143883A/zh
Publication of EP2353705A1 publication Critical patent/EP2353705A1/fr
Withdrawn legal-status Critical Current

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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
    • B01F23/232—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles
    • B01F23/2322—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles using columns, e.g. multi-staged columns
    • 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
    • B01F25/45—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads
    • 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
    • B01F25/45—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads
    • B01F25/452—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads characterised by elements provided with orifices or interstitial spaces
    • B01F25/4521—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads characterised by elements provided with orifices or interstitial spaces the components being pressed through orifices in elements, e.g. flat plates or cylinders, which obstruct the whole diameter of the tube

Definitions

  • the present invention relates to an apparatus for mixing dispersions with gases.
  • the present invention relates to an apparatus for mixing a polymer dispersion with a gas.
  • the invention relates to a method for mixing a dispersion with a gas using a device according to the invention.
  • the mixing devices can clog up and lose their operating characteristics so quickly. They must therefore be replaced frequently, with a cleaning and subsequent recycling of the mixer is usually not possible.
  • the object of the present invention is therefore to specify a device for the efficient mixing of dispersions with gases, which is able to overcome the disadvantages known from the prior art.
  • a device for mixing a dispersion with a gas which has an outer receptacle and at least two spaced by a spacer in the receptacle spaced-apart perforated plates, wherein the receptacle is a support for Receiving a first perforated bottom, on which a hole bottom is arranged loosely and on this first hole bottom a spacer is loosely arranged, on which in turn the at least second hole bottom is arranged.
  • the inventive design of a device for mixing on the one hand prevents the occurrence of high shear forces in the dispersion during the mixing process, moreover, a local overdose of the gas can be prevented.
  • a receptacle which can be formed for example by a tube, to provide a series of spacer plates which are loosely spaced by spacers and which can be freely stacked in the receptacle.
  • a support for the bottom hole bottom it may be provided, for example, to provide the receptacle on its outlet side with a thread, by means of which a suitable end element can be fastened to the receptacle against which the bottom hole bottom is supported.
  • a suitable end element can be fastened to the receptacle against which the bottom hole bottom is supported.
  • other types of fastening for such a closure element may be provided, such as flanges or the like.
  • an inlet element may be provided at the upper end of the receptacle.
  • the receptacle on its inlet and / or outlet side has a cross-sectional taper.
  • a cross-sectional taper can be formed, for example, by the exhaust or inlet element described above.
  • the cross-section tapers on the inlet and / or outlet side by ⁇ 10% with respect to the average cross section of the receptacle. Due to the cross-sectional taper, it is possible to adjust the flow rate and thus the residence time of the dispersion and the gas in the mixer.
  • the total hole area per hole bottom is between 1% and 20% of the total floor area. It has been shown that sufficient mixing can be achieved with such a perforated surface or passage surface without the hydraulic resistance through the perforated plates becoming too high.
  • the hole diameter of the individual holes of a hole bottom is between 1% and 15% of the hole bottom diameter.
  • the holes may be randomly or evenly distributed throughout the hole bottom surface, with even distribution being preferred.
  • the holes in the perforated plates are designed without burrs. This allows the on Shearing forces occurring in the holes are further reduced and coagulation of the dispersion caused by shear can be avoided.
  • the perforated plates can according to another embodiment of the invention have a thickness between 1 mm and 10 mm.
  • the perforated plates have in such a configuration, even with large hole diameters and a high total hole area sufficient stability to withstand the mechanical forces occurring in the device.
  • the distances between the individual perforated plates can correspond to 5 times to 100 times the perforated bottom thickness according to a further embodiment of the invention. It has been found that with such a distance of the perforated plates from one another between the perforated plates, good mixing of the gas with the dispersion can be achieved.
  • the length dimension of the device is between 5 times and 50 times the diameter of the device. With such a length / cross-section ratio, an optimized flow velocity within the device is achieved.
  • the device may have between 3 and 100 perforated plates.
  • the individual hole bottoms can be arranged at equal intervals or at different distances from each other.
  • the perforated plates may have the same hole diameter and / or the total hole area or else different hole diameter and / or total hole area.
  • the device according to the invention for mixing a dispersion with a gas may further comprise, in embodiments, further devices, such as devices for controlling the volume flow or the polymer dispersion and / or gas pressure with which the dispersion and / or the gas are applied to the device. Furthermore, other devices such as pumps and the like may be provided on the device according to the invention.
  • the gas and the dispersion, z As a gaseous acid and a polymer dispersion, the inventive device for mixing a dispersion with a gas in the direction of gravity from top to bottom. Alternatively, the device can also be arranged in the horizontal direction. According to the invention, the introduction of the gas and the dispersion volume and / or pressure controlled. In the Volume control, pre-set volumes of gas and dispersion can be dosed into the device. In the case of pressure-controlled metering, the flow rate of the dispersion z. B. predetermined by an inlet pressure and the gas by means of an ideally open only in one direction valve, which z. B.
  • the inlet pressure of the dispersion in the case of pressure control can hydrostatically or z.
  • B. a diaphragm pump, a hose pump or the like can be controlled.
  • the gas inlet pressure can be adjusted for example via a reducing valve, which is connected downstream of a pressure bottle. If a volume metering of dispersion and gas, this can be done by known methods for volume metering of liquids and gases. Dispersion and gas can be combined in a preferred embodiment in front of the device in a simple Y or T-piece.
  • the receptacle and the perforated plates can take on any shape, wherein a tubular configuration of the receptacle and a round configuration of the perforated plates are preferred.
  • the receptacle and / or the perforated plates as well as the optionally provided further devices of the device according to the invention may preferably be made of an inert material such as a stainless steel or a suitable plastic. It may be provided in one embodiment of the invention that receptacle, spacers and perforated plates are made of different materials.
  • the spacers between the hole bottoms may take any geometric shape, but tubular spacers are preferred. This facilitates, if necessary, the cleaning of the spacers.
  • the spacers and the perforated plates have a diameter which is only slightly smaller than the inner diameter of the receptacle.
  • the diameters are chosen to each other so that the spacers and the hole bottoms can be easily incorporated into the recording, between the inner wall of the receptacle and the outer edges of the spacers and / or perforated plates, however, no or only a small gap exists.
  • the dispersion and the gas at a pressure between 0.2 bar and 60 bar, preferably between 0.5 bar and 10 bar are applied to the device.
  • the pressure can be adjusted by means of suitable devices, such as pumps and / or valves.
  • the dispersion is a polymer dispersion and the gas is a gaseous acid.
  • the polymer dispersion should be acidified by introducing the gaseous acid.
  • the polymer dispersion is a dispersion of a polymer from the group consisting of polychloroprene, polystyrene butadiene, polyurethane, polyacrylate and polysiloxane.
  • the gas is preferably a gas from the group comprising CO 2 , SO 2 , SO 3 , NO 2 , COCl 2 and / or HCl.
  • the polymer dispersion may have, for example, a viscosity of ⁇ 100,000 mPas, preferably ⁇ 10,000 mPas and very particularly preferably ⁇ 1,000 mPas.
  • the polymer dispersion at the end of the mixing process, or at the output of the mixing device according to the invention a lower viscosity than at the entrance.
  • more than 20%, preferably more than 40% and very particularly preferably more than 60% of the gaseous acid introduced is used in the apparatus according to the invention for changing the pH or its adaptation.
  • the polymer dispersion to be acidified by the gaseous acid may for example have a pH> pH 6, preferably> pH 8 and particularly preferably> pH 9. Furthermore, the polymer dispersion may have a solids content of> 20%, preferably> 30% and particularly preferably> 40%.
  • the dispersion may contain other ingredients such as plasticizers, thickeners, anti-aging agents, pigments and the like. These can be dispersed, for example, in the aqueous phase or in the form of a suspension.
  • the polymer dispersion is a substantially anionically stabilized polymer dispersion which, in addition to anionic emulsifiers, may also comprise nonionic emulsifiers.
  • this shows, under typical conditions of use, a volume throughput prior to necessary maintenance, such as may be caused by clogging, of> 1000, preferably> 10000, based on the volume of the device.
  • a volume throughput per minute which is greater than 5 times the volume of the device, preferably greater than 10 times the volume of the device and more preferably greater than 20 times the Volume of the device is. This results in a residence time of the polymer dispersion and the gas or their mixture in the device of ⁇ 12 s, preferably ⁇ 6 s, more preferably ⁇ 3 s.
  • the device according to the invention and the method according to the invention can be used, for example, in the production of coating, dipping and / or rubber latex foam or else in the production of adhesives.
  • FIG. 1 shows a schematic representation of an apparatus according to the invention for mixing a dispersion with a gas.
  • FIG. 1 shows a device 1 according to the invention for mixing a dispersion, for example a Polychloroprendispersion, with a gas, for example CO 2 .
  • the device 1 according to the invention has a receptacle 2, in which perforated plates 3 are arranged.
  • the perforated plates 3 are arranged by means of spacers 4 loosely in the receptacle 2.
  • the receptacle 2 has an inlet 5 and an outlet 6. In the region of the inlet 5 and outlet 6, the cross section of the receptacle tapers with respect to the average cross section. Via the inlet 5, a volume flow 7, which comprises the polymer dispersion and CO 2 , is applied to the device 1.
  • the polymer dispersion and the CO2 can be premixed in a tee 8.
  • the CO 2 can be applied from a gas bomb 9 via a pressure reducer 11 and a connecting line 12 via the tee 8 to the device 1.
  • the polymer dispersion can from a storage tank 10 via a polymer line 13 by means of a Pump 14 are applied to the device 1 according to the invention.
  • the polymer dispersion and the gas mix sufficiently to ensure acidification of the polymer dispersion to the desired pH range.
  • the mixture of polymer dispersion and gas leaves the device 1 via the outlet line 15.
  • a receptacle made of polypropylene with an outer diameter of 12 mm and an inner diameter of 10 mm and a length of 200 mm are alternately spacers with an outer diameter of 9.9 mm and an inner diameter of 8 mm and a length of 15 mm and perforated plates with an outer diameter of 9.9 mm and a thickness of 1 mm.
  • the perforated plates have four square holes with a hole diameter of 1.5 mm each.
  • the recording 13 holes which are spaced apart by 12 spacers, alternately arranged.
  • the perforated plates and the spacers are held only by gravity, or the pressure of the dispersion flowing from top to bottom.
  • a reducer is arranged, by means of which the flow rate can be regulated.
  • a Polychloroprenlatex dispersion having a solids content of 55%, a viscosity of 100 mPas and a pH of pH 12.5 at an inlet pressure of 0.5 bar is applied to the device.
  • From a gas bomb CO2 is adjusted by means of a reducing valve to a pressure of 2 bar and a flow rate of 0.5 liters per minute and applied to the device.
  • the flow rate at the outlet of the device was 0.5 liters per minute.
  • the pH of the latex dispersion at the outlet of the device was pH 9. A service life of> 120 liters was achieved.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
EP10001079A 2010-02-03 2010-02-03 Dispositif et procédé destiné à mélanger des dispersions et des gaz Withdrawn EP2353705A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP10001079A EP2353705A1 (fr) 2010-02-03 2010-02-03 Dispositif et procédé destiné à mélanger des dispersions et des gaz
PCT/EP2011/051309 WO2011095454A1 (fr) 2010-02-03 2011-01-31 Appareil et procédé pour mélanger des dispersions et des gaz
EP11702438.0A EP2531283B1 (fr) 2010-02-03 2011-01-31 Appareil et procédé pour mélanger des dispersions et des gaz
TW100103808A TW201143883A (en) 2010-02-03 2011-02-01 Apparatus for mixing dispersions and gases

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10001079A EP2353705A1 (fr) 2010-02-03 2010-02-03 Dispositif et procédé destiné à mélanger des dispersions et des gaz

Publications (1)

Publication Number Publication Date
EP2353705A1 true EP2353705A1 (fr) 2011-08-10

Family

ID=42306732

Family Applications (2)

Application Number Title Priority Date Filing Date
EP10001079A Withdrawn EP2353705A1 (fr) 2010-02-03 2010-02-03 Dispositif et procédé destiné à mélanger des dispersions et des gaz
EP11702438.0A Not-in-force EP2531283B1 (fr) 2010-02-03 2011-01-31 Appareil et procédé pour mélanger des dispersions et des gaz

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP11702438.0A Not-in-force EP2531283B1 (fr) 2010-02-03 2011-01-31 Appareil et procédé pour mélanger des dispersions et des gaz

Country Status (3)

Country Link
EP (2) EP2353705A1 (fr)
TW (1) TW201143883A (fr)
WO (1) WO2011095454A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3582048A (en) * 1969-06-12 1971-06-01 Union Oil Co Inline fluid mixing device
EP0285725A2 (fr) * 1987-04-10 1988-10-12 Chugoku Kayaku Kabushiki Kaisha Mélangeur
US20020060950A1 (en) * 2000-11-22 2002-05-23 Hideo Furukawa Emulsion producing apparatus
JP2006198557A (ja) * 2005-01-21 2006-08-03 Sato Kogyo Kk 酸化還元電位水製造装置
WO2006134401A1 (fr) * 2005-06-15 2006-12-21 Johnson Matthey Plc Reaction multiphase

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3582048A (en) * 1969-06-12 1971-06-01 Union Oil Co Inline fluid mixing device
EP0285725A2 (fr) * 1987-04-10 1988-10-12 Chugoku Kayaku Kabushiki Kaisha Mélangeur
US20020060950A1 (en) * 2000-11-22 2002-05-23 Hideo Furukawa Emulsion producing apparatus
JP2006198557A (ja) * 2005-01-21 2006-08-03 Sato Kogyo Kk 酸化還元電位水製造装置
WO2006134401A1 (fr) * 2005-06-15 2006-12-21 Johnson Matthey Plc Reaction multiphase

Also Published As

Publication number Publication date
EP2531283A1 (fr) 2012-12-12
TW201143883A (en) 2011-12-16
WO2011095454A1 (fr) 2011-08-11
EP2531283B1 (fr) 2016-04-27

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