EP0347653A2 - Mélangeur à récipient avec agitateur à transport radial et au moins un brise-lames ainsi que procédé pour mélanger des liquides en utilisant un tel mélangeur - Google Patents

Mélangeur à récipient avec agitateur à transport radial et au moins un brise-lames ainsi que procédé pour mélanger des liquides en utilisant un tel mélangeur Download PDF

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Publication number
EP0347653A2
EP0347653A2 EP89110337A EP89110337A EP0347653A2 EP 0347653 A2 EP0347653 A2 EP 0347653A2 EP 89110337 A EP89110337 A EP 89110337A EP 89110337 A EP89110337 A EP 89110337A EP 0347653 A2 EP0347653 A2 EP 0347653A2
Authority
EP
European Patent Office
Prior art keywords
mixing
stirred tank
stirrer
baffle
stirred
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
EP89110337A
Other languages
German (de)
English (en)
Other versions
EP0347653B1 (fr
EP0347653A3 (fr
Inventor
Franz-Michael Dr. Bollenrath
Josef Karl Dr. Rigler
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.)
Huels AG
Original Assignee
Huels AG
Chemische Werke Huels 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 Huels AG, Chemische Werke Huels AG filed Critical Huels AG
Priority to AT89110337T priority Critical patent/ATE87233T1/de
Publication of EP0347653A2 publication Critical patent/EP0347653A2/fr
Publication of EP0347653A3 publication Critical patent/EP0347653A3/fr
Application granted granted Critical
Publication of EP0347653B1 publication Critical patent/EP0347653B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/86—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis co-operating with deflectors or baffles fixed to the receptacle
    • B01F27/862—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis co-operating with deflectors or baffles fixed to the receptacle the baffles being adjustable or movable

Definitions

  • the homogeneous mixing of liquids in reactors, especially in large reactors, is by no means unproblematic. Not only should a good mixing effect be achieved, there should also be no foaming.
  • the liquid for example a polymerization batch, should not form a vortex and in particular should not draw in any gas. Caking should be avoided since it often leads to product damage and inhomogeneities. As is known, it is particularly difficult to achieve homogeneous mixing in liquids which consist of two or more liquid components of different densities.
  • a common stirrer type e.g. B. a disc stirrer (Rushton turbine)
  • a stirred tank diameter D
  • a Rushton turbine are used and four baffles approximately D / 10 wide are installed along the wall of the stirred tank.
  • the disadvantage is that these baffles are not adjustable and can therefore not be adapted to the respective stirring problems.
  • the formation of caking can usually not be avoided on the baffles, which require a considerably increased power input.
  • DE-OS 32 02 159 discloses a process for the preparation of styrene polymers with the addition of low-boiling propellants, in which it is important to obtain a surface that is as free as possible of pellets while stirring. It is proposed, inter alia, to use a stirring system which consists of a stirred kettle, an axially arranged stirrer, preferably an impeller stirrer and a Pfaudler-type finger flow disturbance which is arranged in the vicinity of the stirrer. Such a stirring system can be used above all if the filling height is not greater than the bowl diameter. Problems arise with stirred tanks that are filled higher. It can be seen from the examples that the product quality is considerably deteriorated if the work is not carried out free of leaks.
  • a stirred tank 1 has now been found, which is equipped with a radially conveying stirrer 3 and at least one adjustable baffle 2 and is characterized by the following features: -
  • the radially conveying stirrer 3 preferably an impeller stirrer, is mounted at a maximum distance D / 2 from the bottom of the stirred tank.
  • the baffle or baffles 2 are in the upper half of the stirred tank.
  • the baffle or baffles 2 have the shape of an airfoil profile, ie they are curved in the form of an Archimedean spiral or in the form of part or parts of an arc.
  • the or the baffle 2 are attached at a distance R1 with D / 8 ⁇ R1 ⁇ D / 3 from the wall.
  • the baffle ( s) have the height h s , for which the following relationship preferably applies: 0.2 ⁇ h s / D ⁇ 0.4 -
  • the outflow cross section of the baffle or baffles is preferably rectangular.
  • the invention further relates to a method for mixing liquids using the stirred tank just described.
  • the stirred kettle used according to this invention is a standing stirred kettle 1 with a usually vertical axis and cylindrical shape.
  • the ratio between its height H and its diameter D is usually greater than 1, in particular it is between 1.5 and 2.5.
  • the stirred tank 1 usually has a wicker, ball or dished bottom. The latter is preferred.
  • the total volume of the stirred tank is not critical.
  • stirrer 3 It is usually equipped with a single-stage stirrer 3 near the bottom. It is therefore not necessary, as is often the case with other types of stirrer in difficult cases, to equip it with a multi-stage stirrer or with several stirrers.
  • the shape of the stirrer 3 corresponds to that of an impeller stirrer. Its diameter d is 0.5 D to 0.7 D, the leaf height is 0.2 d.
  • the angle with respect to the horizontal is usually adapted to the shape of the bottom of the stirred tank.
  • the stirred tank 1 contains at least one rotatable baffle 2 ; preferably there are two. These are expediently attached in such a way that they are immersed in the upper third of the liquid in the reactor and the distance between their pivot point and the boiler wall is between 0.1 D and 0.2 D.
  • the angle of attack alpha is preferably between 0 and 60 ° (see Fig. 1).
  • the cross-sectional area of the baffle 2 resembles an airfoil profile, the center line of which is preferably designed as a piece of an Archimedean spiral. For technical reasons, this is often replaced by an arc.
  • the radius of this circle is between approximately 0.15 D and 0.3 D.
  • the baffle 2 can have the shape of a sheet whose cross-section corresponds to the center line described.
  • the height of the baffle 2 is usually between 0.2 D and 0.5 D.
  • the stirred tank 1 according to the invention is used particularly advantageously when dispersions of two different, immiscible liquids of different densities have to be maintained.
  • foam polystyrene Such a problem arises, for example, in the production of foam polystyrene.
  • An aqueous suspension containing styrene polymers and unreacted monomeric styrene is mixed with blowing agent, for. B. pentane.
  • DE-OS 32 02 159 shows that the product properties of foam polystyrene are significantly influenced by the stirring process. The good axial mixing is particularly noticeable here.
  • Another area of application relates to the polymerization of suspension PVC.
  • foam is formed on the surface of the reaction mixture during the polymerization. In the case of reactors equipped with reflux coolers, this foam also settles in the lower part of the cooler. The result is relocation, material damage and failure of the cooler. If the stirring system just described is used in this critical phase of the polymerization, the formation of foam can in many cases be avoided entirely.
  • Fig. 1 shows a stirred tank according to the invention.
  • the direction of rotation of the stirrer is designated 4 .
  • Example 8 of DE-OS 32 02 159 shows that, using the stirred kettle shown in Fig. 1 of this document, stirring with the DAT stirring system can be carried out without dripping and good product properties can be obtained. In this case, however, you have to rely on a stirred tank with two independent stirrers. This is comparatively complex.
  • Example 11 of DE-OS 32 02 159 shows that using the stirred tank shown in Fig. 1 of this document with a Pfaudler stirring system at low fill levels, products of unsatisfactory quality are obtained.
  • Example 1 of DE-OS 32 02 159 shows that using the stirred kettle shown in Fig. 2 of this document with a Pfaudler stirring system at a fill level of 90%, products of unsatisfactory quality are also obtained.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Catching Or Destruction (AREA)
  • Polymerisation Methods In General (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Adhesives Or Adhesive Processes (AREA)
EP89110337A 1988-06-22 1989-06-08 Mélangeur à récipient avec agitateur à transport radial et au moins un brise-lames ainsi que procédé pour mélanger des liquides en utilisant un tel mélangeur Expired - Lifetime EP0347653B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89110337T ATE87233T1 (de) 1988-06-22 1989-06-08 Ruehrkessel mit radial foerderndem ruehrer und mindestens einem stromstoerer sowie verfahren zum durchmischen von fluessigkeiten mit hilfe dieses ruehrkessels.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3821033A DE3821033A1 (de) 1988-06-22 1988-06-22 Ruehrkessel mit radial foerderndem ruehrer und mindestens einem stromstoerer sowie verfahren zum durchmischen von fluessigkeiten mit hilfe dieses ruehrkessels
DE3821033 1988-06-22

Publications (3)

Publication Number Publication Date
EP0347653A2 true EP0347653A2 (fr) 1989-12-27
EP0347653A3 EP0347653A3 (fr) 1991-10-16
EP0347653B1 EP0347653B1 (fr) 1993-03-24

Family

ID=6356992

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89110337A Expired - Lifetime EP0347653B1 (fr) 1988-06-22 1989-06-08 Mélangeur à récipient avec agitateur à transport radial et au moins un brise-lames ainsi que procédé pour mélanger des liquides en utilisant un tel mélangeur

Country Status (6)

Country Link
US (1) US4984899A (fr)
EP (1) EP0347653B1 (fr)
JP (1) JP2755694B2 (fr)
AT (1) ATE87233T1 (fr)
DE (2) DE3821033A1 (fr)
FI (1) FI91365C (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0633060A1 (fr) * 1993-07-08 1995-01-11 Biazzi Sa Appareillage de réaction gaz-liquide

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6467947B1 (en) * 1997-08-19 2002-10-22 Commonwealth Scientific And Industrial Research Organisation Method and apparatus for mixing
US6059448A (en) * 1998-09-02 2000-05-09 Pfaudler, Inc. Concave baffle
JP2003033635A (ja) * 2001-05-17 2003-02-04 Shinko Pantec Co Ltd 攪拌翼およびこれを用いた攪拌装置ならびに攪拌方法
DE10234426A1 (de) * 2001-09-14 2003-04-03 Wolff Cellulosics Gmbh & Co Kg Verfahren und Vorrichtung zur industriellen Herstellung von Methylhydroxyalkylcellulose
ATE359303T1 (de) 2001-09-14 2007-05-15 Wolff Cellulosics Gmbh & Co Kg Verfahren und vorrichtung zur industriellen herstellung von methylhydroxyalkylcellulose
JP5493662B2 (ja) * 2009-09-30 2014-05-14 栗田工業株式会社 流動床式生物処理装置
CN102784612A (zh) * 2012-08-28 2012-11-21 山东邹平开元化工石材有限公司 硫化促进剂m甲苯提取用溶解釜
CN102784613B (zh) * 2012-09-05 2014-05-14 南京工业大学 一种用于合成高吸水性树脂的搅拌反应装置
CN104437213A (zh) * 2014-11-04 2015-03-25 无锡市华明化工有限公司 一种搅拌机
DE102016013071A1 (de) * 2016-06-28 2017-12-28 Hans-Joachim Boltersdorf Vorrichtung zur Behandlung von Material mit einem Behälter
KR102753263B1 (ko) * 2020-04-29 2025-01-14 노벨리스 인크. 폐기물 침강 장치 및 관련 공정
CN113248896B (zh) * 2021-05-28 2022-12-09 广州维邦新材料科技有限公司 一种pc、pbt合金材料的制备装置
CN114950203A (zh) * 2022-05-05 2022-08-30 田泊凝 一种适合大型高粘度介质反应釜搅拌传动系统
WO2025102304A1 (fr) * 2023-11-16 2025-05-22 青美邦新能源材料有限公司 Bouilloire de réaction de lixiviation à haute pression et procédé de commande associé

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2914385A (en) * 1955-09-02 1959-11-24 Universal Oil Prod Co Contacting apparatus
US3321283A (en) * 1963-12-23 1967-05-23 Mobay Chemical Corp Apparatus for conducting rapid chemical reactions
US3273865A (en) * 1964-06-23 1966-09-20 American Radiator & Standard Aerator
JPS5516291B2 (fr) * 1974-09-09 1980-05-01
DE2933421A1 (de) * 1979-08-17 1981-03-26 Stopanski Chimičeski Kombinat Devnja, Devnja, Varna Vorrichtung fuer das vermischen von fluiden
JPS5753621U (fr) * 1980-09-12 1982-03-29
DE3202159A1 (de) * 1981-07-30 1983-02-17 Chemische Werke Hüls AG, 4370 Marl Verfahren zur herstellung feinteiliger, expandierbarer styrolpolymerisate mit verbesserten eigenschaften
DE3330456A1 (de) * 1983-08-24 1985-03-14 Schwelm Verwaltungs-GmbH, 5830 Schwelm Vorrichtung zum mischen von zwei oder mehr komponenten in einem fluessigkeitsstrom
US4728731A (en) * 1986-03-10 1988-03-01 Henkel Kommanditgesellschaft Auf Aktien Reactor and its use in polysaccharide ether production

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0633060A1 (fr) * 1993-07-08 1995-01-11 Biazzi Sa Appareillage de réaction gaz-liquide
US5478535A (en) * 1993-07-08 1995-12-26 Biazzi Sa Apparatus for gas - liquid reactions

Also Published As

Publication number Publication date
JPH0248027A (ja) 1990-02-16
JP2755694B2 (ja) 1998-05-20
FI892987A0 (fi) 1989-06-19
DE3821033A1 (de) 1989-12-28
ATE87233T1 (de) 1993-04-15
FI91365C (fi) 1994-06-27
DE58903868D1 (de) 1993-04-29
FI91365B (fi) 1994-03-15
EP0347653B1 (fr) 1993-03-24
US4984899A (en) 1991-01-15
FI892987A7 (fi) 1989-12-23
EP0347653A3 (fr) 1991-10-16

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