EP0605506A1 - Procede pour le melange de liquides ou pour le melange de solides avec des liquides - Google Patents

Procede pour le melange de liquides ou pour le melange de solides avec des liquides

Info

Publication number
EP0605506A1
EP0605506A1 EP92919611A EP92919611A EP0605506A1 EP 0605506 A1 EP0605506 A1 EP 0605506A1 EP 92919611 A EP92919611 A EP 92919611A EP 92919611 A EP92919611 A EP 92919611A EP 0605506 A1 EP0605506 A1 EP 0605506A1
Authority
EP
European Patent Office
Prior art keywords
mixing
agitator
liquids
ground
stirrer
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Withdrawn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
EP92919611A
Other languages
German (de)
English (en)
Inventor
Edgar Hönges
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.)
Henkel AG and Co KGaA
Original Assignee
Henkel AG and Co KGaA
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 Henkel AG and Co KGaA filed Critical Henkel AG and Co KGaA
Publication of EP0605506A1 publication Critical patent/EP0605506A1/fr
Withdrawn legal-status Critical Current

Links

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
    • B01F27/05—Stirrers
    • B01F27/09—Stirrers characterised by the mounting of the stirrers with respect to the receptacle
    • B01F27/091—Stirrers characterised by the mounting of the stirrers with respect to the receptacle with elements co-operating with receptacle wall or bottom, e.g. for scraping the receptacle wall
    • 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
    • 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
    • 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
    • B01F27/92—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with helices or screws
    • B01F27/921—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with helices or screws with helices centrally mounted in the receptacle
    • B01F27/9211—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with helices or screws with helices centrally mounted in the receptacle the helices being surrounded by a guiding tube

Definitions

  • the invention relates to a method for mixing liquids or for mixing solids into liquids in a mixing container with one or more stirrers arranged on a vertical shaft.
  • the mixture obtained has non-Newtonian flow properties with decreasing viscosity with increasing shear rate and in particular approximately the properties of a BingharnMech.
  • pastes with such flow properties are the so-called detergent slurries which, after the mixing of solids and liquids, are processed into high-pressure nozzles in a spray dryer to form tower powder.
  • the viscosities of such mixtures are very high and are up to 30,000 mPas. Due to the non-Newtonian flow properties, the indication of the viscosity is only to be understood as a rough guide. The mixture does not appear to be stationary to be flowable, but the viscosity increases with increasing
  • MIG and inclined blade stirrers require less inspection tion and maintenance costs.
  • the Ml ⁇ stirrer sprays very heavily in the pass-through mode.
  • Significant wall approaches are the result.
  • the slow-running inclined blade stirrer does not splash, but its mixing effect is unsatisfactory and the agitator blades are covered with caking.
  • the invention is therefore based on the object of developing a method of the type mentioned at the outset which, on the one hand, solves the problems mentioned above, which are associated with the flow properties of the mixture obtained and does not lead to caking, but on the other hand does not result in the high outlay on maintenance as required with the Crutcher stirrer.
  • a sufficiently high stirring power for generating an axial flow with a Tro be introduced into the mix and the downward axial flow with a further stirring element with downward conveying, enclosed by a guide ring with a ground-level stirring element Stirring blades reinforced, which extend radially only in the region of the downward flow generated by the ground-level stirring element.
  • the high stirring power in conjunction with the floor-mounted stirring element ensures that, especially in the case of Bingham liquids, not only does a mixing effect occur in the vicinity of the stirring elements, but the entire mixture is moved.
  • the further stirring element with the stirring blades conveying downwards strengthens the axial mixing and avoids an uneven mass distribution of the container contents.
  • the bearings of the agitator shaft are therefore stressed much less.
  • the guide ring around the additional stirring element also prevents the splashing of liquids in continuous operation.
  • the stirring power related to the mix be at least about 4 kW / m3.
  • the axial circulation and the mixing in the edge area is improved in that the bottom-agitating agitating member has vanes that convey upwards on its circumference.
  • the arms of the base-type agitator consist essentially of rectangular tube with sharp edges.
  • the high local shear forces generated in this way break up agglomerates and lumps in the mix. The result is a more even mass distribution and thus less stress on the agitator shaft bearings.
  • the further stirring element is designed as an inclined blade stirrer, in particular as a trapezoidal stirrer. It is further preferred that the bottom agitator has two arms and the other agitator has four arms.
  • the mixing container is equipped with essentially vertical baffles. It is preferred that the flow breakers are arranged at an angle of up to 15 ° to the vertical in the vicinity of the wall in accordance with the direction of flow of the mixed material. In this way, dead spaces in the flow shadow of the flow breakers are avoided.
  • the longitudinal section of the crutcher agitator shown in FIG. 1 essentially consists of a mixing container 1 and a vertical agitator shaft 2 arranged therein.
  • the agitator shaft 2 (speed about 100 min " 1 ) driven by a motor 3 carries agitators a floor clearer 4 and a vertical screw 5 arranged above it with guide tube 6.
  • Solids and liquids are introduced into the mixing container 1 through the inlets 7 and 8 and move during the mixing process in the direction of the arrows 9.
  • the agitator delivers a good mixing result, but the bottom bearing 10 of the agitator shaft 2 and the vertical screw 5 and the floor clearer 4 are exposed to heavy loads, which lead to increased maintenance.
  • FIG. 2 An exemplary embodiment of an agitator according to the invention is shown in FIG. 2.
  • the same reference numbers denote the same parts.
  • the agitator shaft 2 carries a four-arm inclined blade stirrer 11 with a guide ring 12.
  • the floor space 4 drives the mix 13 outwards in the direction of the container wall and from up there, so that the surface 14 of the mixture 13 forms a trumpet.
  • the radial extension of the inclined blade stirrer is selected so that the trapezoidal stirrer blade ter 15, which are inclined to the downward conveyance of the mix 13, * increase this movement of the mix without the upward flow along the container wall being disturbed.
  • Baffles 16 are also attached to the wall of the mixing container 1. They are arranged obliquely at an angle to the vertical in accordance with the flow direction of the mixed material running near the wall, so that there are no dead spaces in the flow shadow of the flow breakers in which mixed material could accumulate.
  • two upward conveying wings 21 were placed on the circumference. This measure improved the axial circulation and the mixing in the edge area.
  • FIG. 3 shows a longitudinal section of a five-stage MIG stirrer (multi-stage impulse countercurrent stirrer) with a bottom clearer 4 and baffles 16.
  • the agitator shaft 2 carries five four-armed trapezoidal stirrers.
  • Each half of the mixing arm consists of two blades, which are arranged differently, which results in an improvement in the axial flow velocity when mixing Newtonian liquids.
  • caking 18 occurs on the outer stirring blades 19 and the flow breakers 16 after a short time. As a result, the impellers lose their flow-giving shape.
  • the liquid was added in two steps.
  • Steps 1 to 4 take approximately 4 to 5 minutes.
  • the batch size was 2800 to 3000 kg corresponding to a container filling of 4800 to 5000 kg.
  • the remaining stock of 1500 to 3000 kg slurry was varied in the tests.
  • the flow pattern and mixing quality were not significantly influenced by this.
  • the agitator shown in FIG. 5 has two 4-blade inclined-blade agitators 11 with guide ring 12 and a trapezoidal agitator 17 as the bottom element.
  • the same reference numbers designate the same parts.
  • a floor scraper 4 was installed instead of the trapezoidal stirrer in order to improve the mixing action in the lower part of the container 1 (FIG. 6).
  • the floor clearer 4 was constructed from an elliptical tubular profile.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)

Abstract

Le mélange obtenu dans un mélangeur (1) pourvu d'un ou de plusieurs agitateurs montés sur un arbre (2) vertical présente une fluidité non newtonienne, une viscosité chutant lorsque la vitesse de cisaillement augmente, et en particulier, approximativement, les propriétés d'un corps de Bingham. Au moyen d'un élément d'agitation (4) placé de façon qu'il puisse agir au fond du mélangeur, l'on crée une agitation suffisamment grande pour produire un courant axial formant un tourbillon dans la matière à mélanger. L'on renforce le courant axial dirigé vers le bas à l'aide d'un autre élément agitateur pourvu de lames d'agitation (15) agissant vers le bas et entourées d'une bague directrice (12). Les lames d'agitation (15) s'étendent radialement seulement dans la zone du courant dirigé vers le bas et produit par l'élément agitateur (4) pouvant agir au fond du mélangeur. On obtient un bon résultat de mélange sans dépôts sur les éléments d'agitation et sur les parois du mélangeur, et ainsi les travaux d'entretien dudit mélangeur sont réduits.
EP92919611A 1991-09-27 1992-09-18 Procede pour le melange de liquides ou pour le melange de solides avec des liquides Withdrawn EP0605506A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4132154A DE4132154A1 (de) 1991-09-27 1991-09-27 Verfahren zum mischen von fluessigkeiten oder zum einmischen von feststoffen in fluessigkeiten
DE4132154 1991-09-27
PCT/EP1992/002161 WO1993005873A1 (fr) 1991-09-27 1992-09-18 Procede pour le melange de liquides ou pour le melange de solides avec des liquides

Publications (1)

Publication Number Publication Date
EP0605506A1 true EP0605506A1 (fr) 1994-07-13

Family

ID=6441601

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92919611A Withdrawn EP0605506A1 (fr) 1991-09-27 1992-09-18 Procede pour le melange de liquides ou pour le melange de solides avec des liquides

Country Status (4)

Country Link
EP (1) EP0605506A1 (fr)
JP (1) JPH06510699A (fr)
DE (1) DE4132154A1 (fr)
WO (1) WO1993005873A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3064143B2 (ja) * 1992-07-15 2000-07-12 雪印乳業株式会社 固形物を含有する食品の混合方法およびその装置
SE505871C2 (sv) * 1996-01-12 1997-10-20 Kvaerner Pulping Tech Blandningsanordning för blandning av svartlut från cellulosatillverkning med aska från rökgaser åstadkommen vid förbränning av svartlut
JP2002273188A (ja) * 2001-03-19 2002-09-24 Aoki Kk 攪拌機
JP4681244B2 (ja) * 2004-03-31 2011-05-11 株式会社井上製作所 分散等の処理装置
CN102580597B (zh) * 2012-03-07 2014-08-20 巨力新能源股份有限公司 一种浆料快速混匀及自动输送和添加装置
JP6725504B2 (ja) * 2015-07-01 2020-07-22 住友重機械プロセス機器株式会社 撹拌装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1829722A (en) * 1919-12-08 1931-10-27 Flintkote Co Process of making aqueous bituminous emulsions
FR804269A (fr) * 1935-03-27 1936-10-20 Perfectionnements au traitement du chocolat ou autres substances semi-liquides ou plastiques
DE1124329B (de) * 1959-04-28 1962-02-22 Spangenberg Maschf G Ruehrwerksmischer zum Mischen pulverfoermiger bis koerniger Trockengueter
DE1454743B2 (de) * 1962-06-07 1970-05-14 Beck, Erich, 6520 Worms Verfahren und Vorrichtung zum Verdichten und Agglomerieren von pulverförmigen bis körnigen thermoplastischen Stoffen
FR2383700A1 (fr) * 1977-03-18 1978-10-13 Soudure Autogene Francaise Dispositif de granulation de matieres pulverulentes
US4552463A (en) * 1984-03-15 1985-11-12 Harry Hodson Method and apparatus for producing a colloidal mixture

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9305873A1 *

Also Published As

Publication number Publication date
JPH06510699A (ja) 1994-12-01
WO1993005873A1 (fr) 1993-04-01
DE4132154A1 (de) 1993-04-01

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