EP0638354A1 - Mélangeur complètement autonettoyant - Google Patents

Mélangeur complètement autonettoyant Download PDF

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Publication number
EP0638354A1
EP0638354A1 EP94111761A EP94111761A EP0638354A1 EP 0638354 A1 EP0638354 A1 EP 0638354A1 EP 94111761 A EP94111761 A EP 94111761A EP 94111761 A EP94111761 A EP 94111761A EP 0638354 A1 EP0638354 A1 EP 0638354A1
Authority
EP
European Patent Office
Prior art keywords
kneading bars
mixer
kneading
blades
conveyor
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.)
Granted
Application number
EP94111761A
Other languages
German (de)
English (en)
Other versions
EP0638354B1 (fr
Inventor
Dipl.-Ing Heinrich Schuchardt
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.)
Bayer AG
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Bayer AG
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Filing date
Publication date
Application filed by Bayer AG filed Critical Bayer AG
Publication of EP0638354A1 publication Critical patent/EP0638354A1/fr
Application granted granted Critical
Publication of EP0638354B1 publication Critical patent/EP0638354B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B01F27/70—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms
    • B01F27/701—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms comprising two or more shafts, e.g. in consecutive mixing chambers
    • B01F27/702—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms comprising two or more shafts, e.g. in consecutive mixing chambers with intermeshing paddles

Definitions

  • the invention relates to a multi-axis mixer / reactor with a large free usable volume, which cleans itself kinematically, consisting of two or more parallel axes rotating in opposite directions, on which are arranged in a helically offset manner, conveying blades which are connected to one another by axially extended kneading bars and a surrounding one Housing and optionally an inlet and an outlet for the mix.
  • the invention is directed to devices for the processing of fluids and cohesive bulk materials.
  • the device is completely kinematically self-cleaning and has a large free usable volume.
  • Product deposits on the walls of such mixers can lead to process impairments. Undesirable side reactions in the deposits are promoted due to the significantly longer residence time in the reactor. This leads to contamination of the product. Product deposits on the walls can be avoided by kinematic self-cleaning of the mixer.
  • thermotropic, liquid-crystalline polyesters One example is the production of thermotropic, liquid-crystalline polyesters.
  • the rate-determining factor in the final stage of polycondensation is Mass transfer of the condensate into the vacuum gas phase of the reactor. This requires the largest possible mass transfer area and the fastest possible renewal of the same. Due to the pronounced structural viscosity, the product tends to deposit on the wall in non-stirred areas. The longer dwell times here result in black cracked products which, if they get into the product stream, lead to unsaleable goods.
  • a large free usable volume is also sought, i.e. the ratio of the agitator volume to the housing volume should be as low as possible.
  • the apparatus described there has two serious weaknesses: Only the shaft of the rotors serves to absorb bending forces, for example when mixing pasty fluids. However, the wave should be as thin as possible in order to obtain a large free usable volume. As a result, in the small games also sought (because of self-cleaning), due to the deflection of the shaft, a ratio between the length of the apparatus and the center distance of more than 5 at best 7 can hardly be achieved.
  • a heating of the blades and gears in the above-mentioned mixing device would only be possible through a complicated routing of the heating channels, with the feed and return lines having to be led through each tooth base. This is difficult to master from a manufacturing point of view or involves high costs.
  • the object of the invention is to provide an apparatus which is completely kinematically self-cleaning, has a large free volume, does not have the disadvantages mentioned and in which preferably heating / cooling of the stripping elements can be easily integrated.
  • the object is achieved in that in a multi-shaft mixer on each shaft helically offset conveyor blades are arranged, which are interconnected by axially extended kneading bars.
  • the invention relates to a multiaxial mixer / reactor consisting of two or more parallel, counter-rotating shafts, on which screw-shaped conveyor blades are attached, which are connected to one another by axially extended kneading bars (the entirety of the shaft, conveyor blades and kneading bars connected to one another is hereinafter referred to as Rotor).
  • Rotor axially extended kneading bars
  • An enclosing housing optionally with an inlet and an outlet for the mixed material, and in particular with an additional bridge connector for degassing, characterized, that the front and rear sides, seen in the axial direction, of each conveyor blade of a rotor, except at the ends of the mixer, are kinematically completely cleaned by the conveyor blades of another rotor, that each kneading bar of a rotor is kinematically completely cleaned at its ends seen in the axial direction also by the conveyor blades, otherwise by the kneading bars and the shaft
  • each of the rotor blades (except at the ends of the mixer) seen in the axial direction are separated by the conveyor blades of the adjacent rotors, and the kneading bars of a rotor at their ends (viewed in the axial direction) are also separated by the conveyor blades , otherwise by the kneading bars and the shaft of the adjacent rotors, the shafts by the conveyor blades and the kneading bars of the adjacent rotor and the housing by kneading bars and conveyor blades completely kinematically cleaned.
  • Kinematic cleaning is understood to mean the smallest possible approximation of the moving parts of the mixer, which can be achieved when mixing tolerance is taken into account, so that the parts mentioned can slide past one another without blocking.
  • Each feed scoop is connected to a kneading bar on the front and rear.
  • the kneading bar located upstream with respect to the axial conveyance by the conveying blades is connected to the end of the conveying blade leading during rotation and the other to the end of the conveying blade following during rotation.
  • Each kneading bar (with the exception of the ends of the mixer) is connected to two conveyor blades. This results in consequences of conveying blades connected by kneading bars extending over the entire mixer length.
  • a torque that is constant over time is also sought.
  • this is achieved in that the offset between the kneading bars on the front and on the back of a conveyor scoop ( ⁇ ) is not an integral multiple of the partial angle between two adjacent kneading bars ( ⁇ ) in order to equalize the drive torque.
  • the offset between the kneading bars on the front and back of a blade is the angle by which the one kneading bar must be rotated about the axis of rotation of the connected shaft so that its imaginary axial extension merges precisely into the kneading bars.
  • the partial angle between two kneading bars is the angle by which a kneading bar must be rotated about the axis of rotation of the connected shaft so that it coincides with the other kneading bar.
  • a complete heating or cooling of the rotors, conveyor blades and kneading bars is possible in a preferred embodiment of the invention, if the heating / cooling medium is passed through a shaft end, in each case a partial flow of the medium through the respective first delivery blades of a sequence of interconnected kneading bars and conveyor blades to the subsequent kneading bar, following the consequences of kneading bars and conveyor blades over the entire rotor length, through the last conveyor blade back to the shaft and from there through the shaft end opposite to the inlet, with a further partial flow of the heating / cooling medium passing through a longitudinal hole in the shaft to heat or cool the shaft.
  • the apparatus described in DE 41 26 425 A1 there are no places where the supply and return lines of the heating medium have to be guided through a conveyor blade root or a tooth root.
  • the manufacturing process is correspondingly simple to control.
  • FIG. 1 the basic structure of a mixer according to the invention is shown. There are two shafts 1, 11 in a housing 4. Conveyor blades 2, 7, 12, 17... Are connected to these in each case following a simple spiral.
  • the illustration in FIG. 1 is simplified to such an extent that the edges occurring in a radial section are not epicycloids and the mixer shown is also not completely self-cleaning.
  • Fig. 2 shows the spatial representation of a mixer according to the invention.
  • the housing is only partially shown.
  • Conveyor blades 2, 7, 12, 17 ... are arranged on each shaft following a double spiral.
  • the front and rear sides of the conveyor blades are not, as in FIG. 1, in planes perpendicular to the axes of rotation, rather the conveyor blades are set up in such a way that they increasingly contribute to axial transport.
  • the conveying blades are connected by kneading bars 3, 13 ... on each shaft to form 7 sequences of alternating kneading bars and conveying blades.
  • the mixer is designed to rotate at the same speed in opposite directions.
  • the free usable volume is 68.5% of the interior volume.
  • Fig. 3 shows a radial section corresponding to A in Fig. 1c through the mixer of Fig. 2, as it also shows on the front surface of the mixer in Fig. 2.
  • Scraper 9 from FIG. 2 thus appears as line 414, 415, 416, 417 and scraper 19 as 314, 315, 316, 317 in FIG. 3.
  • the same radial section is shown in 18 phase images that follow one another in time shown during a full revolution of the shafts.
  • Edge 314 cleans the surface 445-447, Edge 414 cleans the surface 345-347, Edge 324 cleans the surface 455-457, Edge 424 cleans the surface 355-357, Edge 334 cleans the surface 465-467, Edge 434 cleans the surface 365-367, Edge 344 cleans the surface 475-477, Edge 444 cleans the surface 375-377, Edge 354 cleans the surface 416-417, Edge 454 cleans the surface 316-317, Edge 364 cleans the surface 425-427, Edge 464 cleans the surface 325-327, Edge 374 cleans the surface 435-437, Edge 474 cleans the surface 335-337, Edge 315 cleans the surface 443-447, Edge 415 cleans the surface 343-347, Edge 315 cleans the surface 442-448, Edge 415 cleans the surface 342-348, Edge 325 cleans the surface 457-462, Edge 425 cleans the surface 357-362, Edge 325 cleans the surface 463-464
  • the end faces of the housing are e.g. completely cleaned by edges of the terminal blades 9, 19 ...
  • FIG. 5 Another preferred variant of the mixer according to the invention is shown in FIG. 5. This differs from the mixer according to FIG. 2 primarily in that the conveyor blades 2, 12, 7, 9, 17, 19 ... are designed as flat disks, the front and rear of which are perpendicular to the axes of rotation 1, 11 .
  • An advantage of this preferred mixer is the simpler technical manufacture of the mixer due to the simpler construction.
  • Conveyor blades and kneading bars are prismatic and therefore light e.g. by milling.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Other Resins Obtained By Reactions Not Involving Carbon-To-Carbon Unsaturated Bonds (AREA)
  • Accessories For Mixers (AREA)
  • Polyesters Or Polycarbonates (AREA)
EP94111761A 1993-08-10 1994-07-28 Mélangeur complètement autonettoyant Expired - Lifetime EP0638354B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4326807 1993-08-10
DE4326807A DE4326807A1 (de) 1993-08-10 1993-08-10 Vollständig selbstreinigender Mischer

Publications (2)

Publication Number Publication Date
EP0638354A1 true EP0638354A1 (fr) 1995-02-15
EP0638354B1 EP0638354B1 (fr) 1998-05-20

Family

ID=6494846

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94111761A Expired - Lifetime EP0638354B1 (fr) 1993-08-10 1994-07-28 Mélangeur complètement autonettoyant

Country Status (4)

Country Link
US (1) US5505536A (fr)
EP (1) EP0638354B1 (fr)
JP (1) JP3645923B2 (fr)
DE (2) DE4326807A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0715881A3 (fr) * 1994-12-05 1996-06-26 Bayer Ag
EP0715882A3 (fr) * 1994-12-05 1996-06-26 Bayer Ag
EP0798093A2 (fr) * 1996-03-26 1997-10-01 Bayer Ag Réacteur-mélangeur autonettoyant pour des matériaux cohésifs et à haute viscosité
US7083319B2 (en) 2003-05-15 2006-08-01 Buss Sms Gmbh Verfahrenstechnic Large-volume reactor having a plurality of process spaces
CN106414560A (zh) * 2014-01-30 2017-02-15 科思创德国股份有限公司 具有改进的流变性能的聚硅氧烷-聚碳酸酯嵌段共缩合物
US9828462B2 (en) 2013-10-08 2017-11-28 Covestro Deutschland Ag Preparation of siloxane-containing block copolycarbonates by means of reactive extrusion
WO2018114901A1 (fr) 2016-12-19 2018-06-28 Covestro Deutschland Ag Production de copolycarbonates séquencés contenant du siloxane au moyen d'agents de compatibilisation
EP3581605A1 (fr) 2018-06-14 2019-12-18 Covestro Deutschland AG Procédé de commande de fonte pour la production simultanée d'au moins deux polycarbonates différents dans une installation de production
EP3719077A1 (fr) 2019-04-02 2020-10-07 Covestro Deutschland AG Copolycarbonates séquencés contenant du siloxan à faible granulométrie
WO2021023690A1 (fr) 2019-08-08 2021-02-11 Covestro Intellectual Property Gmbh & Co. Kg Procédé de préparation d'un polycarbonate
WO2023208897A1 (fr) 2022-04-29 2023-11-02 Covestro Deutschland Ag Mélange de carbonate de polyester et sa production par l'intermédiaire d'un prépolymère de carbonate de polyester

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19801073A1 (de) * 1998-01-14 1999-07-15 Bayer Ag Mischvorrichtung
DE19852065A1 (de) * 1998-11-11 2000-05-18 Bayer Ag Mischvorrichtung für hochviskose Podukte
AU2002250893A1 (en) * 2001-02-26 2002-09-12 List Ag Method and device for mixing products
US8226022B2 (en) 2010-07-28 2012-07-24 Eirich Machines, Inc. Mixer with a chopper

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61234917A (ja) * 1985-04-10 1986-10-20 Mitsubishi Heavy Ind Ltd 表面更新性を有する横型反応器
WO1988004198A1 (fr) * 1986-12-11 1988-06-16 Heinz Nienhaus Sechoir ou reacteur malaxeurs multiaxiaux
JPS63232828A (ja) * 1987-03-20 1988-09-28 Mitsubishi Heavy Ind Ltd 撹拌装置
EP0460466A1 (fr) * 1990-06-06 1991-12-11 Bayer Ag Réacteur/mélangeur autonettoyant avec un grand volume utilisable
DE4126425A1 (de) * 1991-08-09 1993-02-11 Bayer Ag Vollstaendig selbstreinigender reaktor/mischer mit grossem nutzvolumen

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DE734521C (de) * 1939-12-30 1943-04-17 Werner & Pfleiderer Mischmaschine fuer Sand u. dgl. schmirgelnde Massen
CH506322A (de) * 1969-03-17 1971-04-30 List Heinz Mehrspindelige Misch- und Knetmaschine
US3734468A (en) * 1970-02-03 1973-05-22 Nat Res Dev Mixing devices
DE2123956C3 (de) * 1970-05-20 1979-09-20 Heinz Dipl.-Ing. Pratteln List (Schweiz) Misch- und Knetmaschine
JPS605226A (ja) * 1983-06-21 1985-01-11 Ube Ind Ltd 粉粒体の撹拌装置
EP0144092B1 (fr) * 1983-12-05 1988-10-12 Dipl.-Ing. H. List Industrielle Verfahrenstechnik Machine pour mélanger et pétrir
US4556324A (en) * 1984-05-01 1985-12-03 E. I. Du Pont De Nemours And Company Apparatus for forming films of constant thickness
CH680196A5 (fr) * 1988-02-16 1992-07-15 List Ag
CH678285A5 (fr) * 1988-02-16 1991-08-30 List Ag
US4883361A (en) * 1988-06-09 1989-11-28 B-V Dough Handling Systems, Inc. Dough processing apparatus
US4857632A (en) * 1988-06-13 1989-08-15 Polysar Limited Residue removal process
US5230562A (en) * 1989-11-02 1993-07-27 Sumitomo Heavy Industries, Ltd. Viscous liquid processor
JP2925599B2 (ja) * 1989-11-02 1999-07-28 住友重機械工業株式会社 高粘度液処理装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61234917A (ja) * 1985-04-10 1986-10-20 Mitsubishi Heavy Ind Ltd 表面更新性を有する横型反応器
WO1988004198A1 (fr) * 1986-12-11 1988-06-16 Heinz Nienhaus Sechoir ou reacteur malaxeurs multiaxiaux
JPS63232828A (ja) * 1987-03-20 1988-09-28 Mitsubishi Heavy Ind Ltd 撹拌装置
EP0460466A1 (fr) * 1990-06-06 1991-12-11 Bayer Ag Réacteur/mélangeur autonettoyant avec un grand volume utilisable
DE4126425A1 (de) * 1991-08-09 1993-02-11 Bayer Ag Vollstaendig selbstreinigender reaktor/mischer mit grossem nutzvolumen
EP0528210A1 (fr) * 1991-08-09 1993-02-24 Bayer Ag Réacteur-mélangeur complètement autonettoyant avec grand volume utile

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* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 8648, Derwent World Patents Index; AN 86-316057 *
DATABASE WPI Week 8845, Derwent World Patents Index; AN 88-317716 *

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0715882A3 (fr) * 1994-12-05 1996-06-26 Bayer Ag
US5658075A (en) * 1994-12-05 1997-08-19 Bayer Aktiengesellschaft Self-cleaning reactor/mixer for highly viscous and solids-bearing materials to be mixed
US5669710A (en) * 1994-12-05 1997-09-23 Bayer Aktiengesellschaft Completely self-cleaning mixer/reactor
EP0715881A3 (fr) * 1994-12-05 1996-06-26 Bayer Ag
EP0798093A2 (fr) * 1996-03-26 1997-10-01 Bayer Ag Réacteur-mélangeur autonettoyant pour des matériaux cohésifs et à haute viscosité
EP0798093A3 (fr) * 1996-03-26 1998-03-18 Bayer Ag Réacteur-mélangeur autonettoyant pour des matériaux cohésifs et à haute viscosité
US7083319B2 (en) 2003-05-15 2006-08-01 Buss Sms Gmbh Verfahrenstechnic Large-volume reactor having a plurality of process spaces
US9828462B2 (en) 2013-10-08 2017-11-28 Covestro Deutschland Ag Preparation of siloxane-containing block copolycarbonates by means of reactive extrusion
US10035884B2 (en) 2014-01-30 2018-07-31 Covestro Deutschland Ag Polysiloxane-polycarbonate block cocondensates with improved rheological properties
CN106414560A (zh) * 2014-01-30 2017-02-15 科思创德国股份有限公司 具有改进的流变性能的聚硅氧烷-聚碳酸酯嵌段共缩合物
CN106414560B (zh) * 2014-01-30 2019-09-27 科思创德国股份有限公司 具有改进的流变性能的聚硅氧烷-聚碳酸酯嵌段共缩合物
WO2018114901A1 (fr) 2016-12-19 2018-06-28 Covestro Deutschland Ag Production de copolycarbonates séquencés contenant du siloxane au moyen d'agents de compatibilisation
US11161938B2 (en) 2016-12-19 2021-11-02 Covestro Deutschland Ag Production of siloxane-containing block copolycarbonates by means of compatibilizers
EP3581605A1 (fr) 2018-06-14 2019-12-18 Covestro Deutschland AG Procédé de commande de fonte pour la production simultanée d'au moins deux polycarbonates différents dans une installation de production
WO2019238419A1 (fr) 2018-06-14 2019-12-19 Covestro Deutschland Ag Procédé de transestérification en fusion pour la fabrication simultanée d'au moins deux polycarbonates de types différents dans une installation de production
EP3719077A1 (fr) 2019-04-02 2020-10-07 Covestro Deutschland AG Copolycarbonates séquencés contenant du siloxan à faible granulométrie
WO2020201178A1 (fr) 2019-04-02 2020-10-08 Covestro Intellectual Property Gmbh & Co. Kg Copolycarbonates séquencés contenant du siloxane à petite taille de domaine
US11970615B2 (en) 2019-04-02 2024-04-30 Covestro Intellectual Property Gmbh & Co. Kg Siloxane-containing block copolycarbonates having a small domain size
WO2021023690A1 (fr) 2019-08-08 2021-02-11 Covestro Intellectual Property Gmbh & Co. Kg Procédé de préparation d'un polycarbonate
WO2023208897A1 (fr) 2022-04-29 2023-11-02 Covestro Deutschland Ag Mélange de carbonate de polyester et sa production par l'intermédiaire d'un prépolymère de carbonate de polyester

Also Published As

Publication number Publication date
DE4326807A1 (de) 1995-02-16
US5505536A (en) 1996-04-09
JPH07100350A (ja) 1995-04-18
EP0638354B1 (fr) 1998-05-20
DE59405991D1 (de) 1998-06-25
JP3645923B2 (ja) 2005-05-11

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