EP0638354A1 - Mélangeur complètement autonettoyant - Google Patents
Mélangeur complètement autonettoyant Download PDFInfo
- 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
Links
- 238000004140 cleaning Methods 0.000 title abstract description 11
- 238000004898 kneading Methods 0.000 claims abstract description 69
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000005520 cutting process Methods 0.000 claims description 5
- 239000002826 coolant Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 238000007872 degassing Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000005452 bending Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000010327 methods by industry Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 235000011837 pasties Nutrition 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
Images
Classifications
-
- 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)
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)
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)
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)
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 |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
-
1993
- 1993-08-10 DE DE4326807A patent/DE4326807A1/de not_active Withdrawn
-
1994
- 1994-07-28 DE DE59405991T patent/DE59405991D1/de not_active Expired - Lifetime
- 1994-07-28 EP EP94111761A patent/EP0638354B1/fr not_active Expired - Lifetime
- 1994-08-05 US US08/286,517 patent/US5505536A/en not_active Expired - Lifetime
- 1994-08-09 JP JP20608994A patent/JP3645923B2/ja not_active Expired - Fee Related
Patent Citations (6)
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 |
Non-Patent Citations (2)
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)
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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