EP1082174A1 - Mill drying of cellulose derivatives, especially methylcellulose - Google Patents

Mill drying of cellulose derivatives, especially methylcellulose

Info

Publication number
EP1082174A1
EP1082174A1 EP99924882A EP99924882A EP1082174A1 EP 1082174 A1 EP1082174 A1 EP 1082174A1 EP 99924882 A EP99924882 A EP 99924882A EP 99924882 A EP99924882 A EP 99924882A EP 1082174 A1 EP1082174 A1 EP 1082174A1
Authority
EP
European Patent Office
Prior art keywords
air
product
grinding
vortex mill
fed
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
EP99924882A
Other languages
German (de)
French (fr)
Other versions
EP1082174B1 (en
Inventor
Michael Andreae-Jäckering
Günter WERRY
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.)
Altenburger Maschinen KG Jaeckering and Co
Original Assignee
Altenburger Maschinen KG Jaeckering and Co
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 Altenburger Maschinen KG Jaeckering and Co filed Critical Altenburger Maschinen KG Jaeckering and Co
Publication of EP1082174A1 publication Critical patent/EP1082174A1/en
Application granted granted Critical
Publication of EP1082174B1 publication Critical patent/EP1082174B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
    • B02C23/24—Passing gas through crushing or disintegrating zone
    • B02C23/26—Passing gas through crushing or disintegrating zone characterised by point of gas entry or exit or by gas flow path

Definitions

  • Air whirling mills of the ULTRA-ROTOR type have been used successfully for many years for the grinding or simultaneous grinding and drying of cellulose derivatives.
  • Air vortex mills of this type are known, for example, from EP-A-226 900 and from the "Grinding and Drying Plant” brochure from Altenburger Maschinen KG Jburgering & Co.
  • Cellulose is usually produced and modified in reactors and then enters the next process step as wet cellulose pulp.
  • a free-flowing powder of methyl cellulose was obtained in one step.
  • the bulk density of the cellulose was always of great importance.
  • the cellulose is conveyed in the wet state, moisture content typically 60-70%, but 80% is possible and more, as a wet product, into a cold air stream in the ULTRA-ROTOR.
  • the hot air is first fed into the upper grinding zones and the product is then dried there.
  • water can be injected in the lower area of the rotor. This further increases the bulk weight. The water injection ensures that the product remains sufficiently moist and cool during the grinding phase.
  • Both fine celluloses, grain size 63 to 150 my, as well as coarser celluloses, grain size 200 to 800 my, intended for consumption, can be ground and dried with a high bulk density.
  • FIGS. 1 to 3 each of which shows an air vortex mill 1 with its drive motor 2 in a highly schematic manner.
  • the milled and / or dried product usually passes through such mills 1 from bottom to top. Because of the high flow velocities, the product stays in the mill for only a few seconds (e.g. 1 to 2 seconds).
  • FIG. 1 shows an air vortex mill according to the prior art. Below the lower grinding stage (grinding stages are only shown in Figure 3) their inlet 3. The product leaves the mill through the outlet 4 located above the grinding stages. This outlet 4 is followed only by the devices shown in FIG. 3, usually cyclones, which serve to separate the product from the air flow.
  • FIG. 2 shows an air vortex mill 1 in which the grinding and drying of cellulose derivatives is carried out by the method according to the invention.
  • the product is fed to inlet 3 together with ambient air.
  • the air vortex mill 1 is equipped with an inlet 5. It is located above the product inlet 3 and opens into the mill 1 at a height at which the crushing process takes place. Water can be injected via the inlet 5 in order to keep the product wet and cool during the comminution process.
  • FIG. 3 shows an air vortex mill 1 with seven grinding stages 8. Ambient air and product are supplied to the inlet 3. As indicated by an arrow, product can also be added up to the level of the second grinding stage (inlet 7).
  • the grinding process essentially takes place in the lower and middle region of the mill 1. As already mentioned, it is advisable to inject water at ambient temperature or cooler (e.g. 14 ° C) at the level of the grinding zones in which the crushing takes place, so that the product moisture does not drop below about 70%. In the illustrated embodiment, the injection takes place between the third and fifth grinding stage 8. Two water inlets 5, 5 'can also be provided.
  • the warm or hot air - e.g. with a temperature of 1 80 to 220 ° C - is only supplied at the level of the upper stages (in the illustrated embodiment at the level of the sixth stage).
  • the drying of the product takes place in this area.
  • a residual moisture of less than 5% H20 is aimed for. If this is not achieved in the top two stages, there is the possibility, on the one hand, of increasing the number of stages of the air vortex mill.
  • the residual moisture can be set to the desired level in a dryer of any kind connected to the outlet 4.
  • a dryer 9 connected to the outlet 4 is shown schematically. This is followed by a cyclone system 10 known per se for separating product and air.

Abstract

Method for milling and drying cellulose derivatives in an air blast mill (1), wherein the product is fed to the air blast mill (1) in a wet state, the wet product is fine milled cold in the first or lower milling areas (8) of the air blast mill (1) and then fed to the other milling areas (steps) attached to the first milling areas (steps) for exposure to the warm/hot air for drying.

Description

Mahltrocknung von Zellulose-Derivaten, insbesondere Methyl-Zellulose Mill drying of cellulose derivatives, especially methyl cellulose
Ausgangs Situation:Initial situation:
Für die Vermahlung bzw. gleichzeitige Mahlung und Trocknung von Zellulose-Derivaten werden Luftwirbelmühlen vom Typ ULTRA-ROTOR seit vielen Jahren erfolgreich eingesetzt. Luftwirbelmühlen dieser Art sind beispielsweise aus der EP-A-226 900 sowie aus der Broschüre „Grinding and Drying Plant" der Altenburger Maschinen KG Jäckering & Co. bekannt.Air whirling mills of the ULTRA-ROTOR type have been used successfully for many years for the grinding or simultaneous grinding and drying of cellulose derivatives. Air vortex mills of this type are known, for example, from EP-A-226 900 and from the "Grinding and Drying Plant" brochure from Altenburger Maschinen KG Jäckering & Co.
Zellulose wird üblicherweise in Reaktoren hergestellt und modifiziert und kommt dann als nasse Zellulose-Pulpe in den nächsten Verfahrensschritt.Cellulose is usually produced and modified in reactors and then enters the next process step as wet cellulose pulp.
Hier wurde früher die Zellulose mit konventionellen Methoden getrocknet und anschließend oder vorher auf Kugelmühlen mit hohem Aufwand zerkleinert.In the past, the cellulose was dried using conventional methods and then or previously crushed on ball mills with great effort.
Auch andere Verfahrenstechniken wurden eingesetzt.Other process technologies have also been used.
In den letzten Jahren wurden mehr und mehr Mahltrocknungsanlagen vom Typ ULTRA-ROTOR für die gleichzeitige Mahlung und Trocknung von Zellulose, insbesondere Methyl-Zellulose (MC) eingesetzt.In recent years, more and more ULTRA-ROTOR grinding drying systems have been used for the simultaneous grinding and drying of cellulose, in particular methyl cellulose (MC).
Hierbei erreichte man in einem Arbeitsschritt ein rieselfähiges Pulver von Methyl-Zellulose.A free-flowing powder of methyl cellulose was obtained in one step.
Neben anderen wichtigen Eigenschaften (z.B . Korngröße, Restfeuchte, Rieselfähigkeit) war immer wieder das Schüttgewicht der Zellulose von großer Bedeutung.In addition to other important properties (e.g. grain size, residual moisture, pourability), the bulk density of the cellulose was always of great importance.
Üblicherweise erreichte man Schüttgewichte zwischen 200 und 300 g pro Liter.Bulk weights between 200 and 300 g per liter were usually achieved.
Bestimmte Anwender suchten jedoch immer nach Wegen, ein höheres Schüttgewicht für die Zellulose zu erreichen. Problemlösung:However, certain users were always looking for ways to achieve a higher bulk density for the cellulose. Troubleshooting:
Bisher wurde Heißluft in den ULTRA-ROTOR gefördert und das Produkt wurde in den Heißluftstrom dosiert und gleichzeitig gemahlen und getrocknet, wie viele andere Produkte.Up to now, hot air has been fed into the ULTRA-ROTOR and the product has been dosed into the hot air flow and at the same time ground and dried, like many other products.
Zur Lösung der Aufgabe das Schüttgewicht zu erhöhen, wurde folgendes Verfahren entwickelt:The following procedure was developed to solve the task of increasing the bulk weight:
Die Zellulose wird im nassen Zustand, Feuchtigkeitsgehalt typischerweise 60 - 70%, j edoch auch 80% sind möglich und mehr, als nasses Produkt in einen Kaltluftstrom in den ULTRA-ROTOR gefördert.The cellulose is conveyed in the wet state, moisture content typically 60-70%, but 80% is possible and more, as a wet product, into a cold air stream in the ULTRA-ROTOR.
In den unteren Mahlzonen wird das Produkt dann als nasses Produkt kalt (kalt = Umgebungsluft oder gekühlte Luft, z.B . mit Stickstoff oder CO2 gekühlt) feingemahlen. Während der Mahlphase sollte erreicht werden, daß zumindest die Umgebungstemperatur nicht überschritten wird. Die Heißluft wird erst in den oberen Mahlzonen zugeführt, und das Produkt dort dann getrocknet.In the lower grinding zones, the product is then finely ground cold as a wet product (cold = ambient air or cooled air, e.g. cooled with nitrogen or CO2). During the grinding phase it should be ensured that at least the ambient temperature is not exceeded. The hot air is first fed into the upper grinding zones and the product is then dried there.
Durch diese Verfahrensmaßnahmen erreicht man Schüttgewichte, die deutlich über den bisher erreichten Schüttgewichten liegen und zwischen 300 und 500 oder sogar mehr Gramm pro Liter liegen.Through these process measures, bulk densities are achieved which are significantly higher than the bulk densities previously achieved and are between 300 and 500 or even more grams per liter.
Zusätzlich kann im unteren Bereich des Rotors Wasser eingedüst werden. Hiermit wird das Schüttgewicht weiter gesteigert. Durch die Wasserein- düsung wird erreicht, daß das Produkt während der Mahlphase ausreichend feucht und kühl bleibt.In addition, water can be injected in the lower area of the rotor. This further increases the bulk weight. The water injection ensures that the product remains sufficiently moist and cool during the grinding phase.
Das erzielte höhere Schüttgewicht ist von enormer kommerzieller und technischer Bedeutung.The higher bulk density achieved is of enormous commercial and technical importance.
Sowohl feine Zellulosen, Korngröße 63 bis 150 my, als auch gröbere, eher für den Konsumbereich bestimmte Zellulosen, Korngröße 200 bis 800 my, können so gemahlen und getrocknet werden bei hohem Schüttgewicht.Both fine celluloses, grain size 63 to 150 my, as well as coarser celluloses, grain size 200 to 800 my, intended for consumption, can be ground and dried with a high bulk density.
Weitere Vorteile und Einzelheiten der Erfindung sollen anhand der Figuren 1 bis 3 erläutert werden, die jeweils stark schematisch eine Luftwirbelmühle 1 mit ihrem Antriebsmotor 2 zeigen. Das zu mahlende und/oder zu trocknende Produkt durchsetzt solche Mühlen 1 üblicherweise von unten nach oben. Wegen der hohen Strömungsgeschwindigkeiten beträgt die Aufenthaltsdauer des Produkts in der Mühle nur wenige Sekunden (z.B . 1 bis 2 Sekunden).Further advantages and details of the invention will be explained with reference to FIGS. 1 to 3, each of which shows an air vortex mill 1 with its drive motor 2 in a highly schematic manner. The milled and / or dried product usually passes through such mills 1 from bottom to top. Because of the high flow velocities, the product stays in the mill for only a few seconds (e.g. 1 to 2 seconds).
Figur 1 zeigt eine Luftwirbelmühle nach dem Stand der Technik. Unterhalb der unteren Mahlstufe (Mahlstufen sind nur in Figur 3 dargestellt) befindet sich ihr Einlaß 3. Das Produkt verläßt die Mühle durch den oberhalb der Mahlstufen befindlichen Auslaß 4. An diesem Auslaß 4 schließen sich nur in Figur 3 dargestellte Einrichtungen an, üblicherweise Zyklone, die der Trennung des Produkts vom Luftstrom dienen .Figure 1 shows an air vortex mill according to the prior art. Below the lower grinding stage (grinding stages are only shown in Figure 3) their inlet 3. The product leaves the mill through the outlet 4 located above the grinding stages. This outlet 4 is followed only by the devices shown in FIG. 3, usually cyclones, which serve to separate the product from the air flow.
Auch die Mahlung und Trocknung von Zellulose-Derivaten erfolgte bisher in Luftwirbelmühlen der in Figur 1 dargestellten Art. Dazu wurde das Produkt - wie in Figur 1 (Stand der Technik) dargestellt - zusammen mit Warmluft dem Einlaß zugeführt.The grinding and drying of cellulose derivatives has also hitherto been carried out in air vortex mills of the type shown in FIG. 1. For this purpose, the product - as shown in FIG. 1 (prior art) - was fed to the inlet together with warm air.
Figur 2 zeigt eine Luftwirbelmühle 1 in der die Mahlung und Trocknung von Zellulose-Derivaten nach dem erfindungsgemäßen Verfahren durchgeführt wird. Das Produkt wird zusammen mit Umgebungsluft dem Einlaß 3 zugeführt. In Höhe der unteren und mittleren Mahlstufen oder -zonen findet das Zerkleinern des Produkts in nassem Zustand und bei relativ niedrigen Temperaturen (etwa Umgebungstemperatur) statt. Zusätzlich ist die Luftwirbelmühle 1 mit einem Einlaß 5 ausgerüstet. Er befindet sich über dem Produkteinlaß 3 und mündet in die Mühle 1 in einer Höhe, in der im wesentlichen der Zerkleinerungsprozess stattfindet. Über den Einlaß 5 kann Wasser eingedüst werden, um das Produkt während des Zerkleinerungsprozesses naß und kühl zu halten.FIG. 2 shows an air vortex mill 1 in which the grinding and drying of cellulose derivatives is carried out by the method according to the invention. The product is fed to inlet 3 together with ambient air. At the level of the lower and middle grinding stages or zones, the product is crushed when wet and at relatively low temperatures (e.g. ambient temperature). In addition, the air vortex mill 1 is equipped with an inlet 5. It is located above the product inlet 3 and opens into the mill 1 at a height at which the crushing process takes place. Water can be injected via the inlet 5 in order to keep the product wet and cool during the comminution process.
Erst in dem oberen Bereich der Luftwirbelmühle 1 wird Warmluft eingeführt. Dazu ist in diesem Bereich ein weiterer Einlaß 6 vorgesehen. Das gemahlene und getrocknete Produkt verläßt die Mühle 1 durch den Auslaß 4. Die Trennung des Produkts von der Luft erfolgt in bekannter Weise, z.B . in nur in Figur 3 dargestellten, angeschlossenen Zyklonen.Warm air is introduced only in the upper region of the air vortex mill 1. For this purpose, a further inlet 6 is provided in this area. The ground and dried product leaves the mill 1 through the outlet 4. The product is separated from the air in a known manner, e.g. in connected cyclones shown only in Figure 3.
Figur 3 zeigt eine Luftwirbelmühle 1 mit sieben Mahlstufen 8. Dem Einlaß 3 wird Umgebungsluft und Produkt zugeführt. Wie durch einen Pfeil angedeutet, kann Produkt auch noch bis zur Höhe der zweiten Mahlstufe zugegeben werden (Einlaß 7).FIG. 3 shows an air vortex mill 1 with seven grinding stages 8. Ambient air and product are supplied to the inlet 3. As indicated by an arrow, product can also be added up to the level of the second grinding stage (inlet 7).
Im unteren und mittleren Bereich der Mühle 1 findet im wesentlichen der Mahlprozess statt. Wie bereits erwähnt, ist es zweckmäßig, in Höhe derjenigen Mahlzonen, in denen im wesentlichen die Zerkleinerung stattfindet, Wasser mit Umgebungstemperatur oder kühler (z.B . 14°C), einzudüsen, um die Produktfeuchte nicht unter etwa 70% absinken zu lassen. Beim dargestellten Ausführungsbeispiel findet das Eindüsen zwischen der dritten und fünften Mahlstufe 8 statt. Auch zwei Wassereinlässe 5 , 5 ' können vorgesehen sein.The grinding process essentially takes place in the lower and middle region of the mill 1. As already mentioned, it is advisable to inject water at ambient temperature or cooler (e.g. 14 ° C) at the level of the grinding zones in which the crushing takes place, so that the product moisture does not drop below about 70%. In the illustrated embodiment, the injection takes place between the third and fifth grinding stage 8. Two water inlets 5, 5 'can also be provided.
Die Warm- bzw. Heißluft - z.B . mit einer Temperatur von 1 80 bis 220°C - wird erst in Höhe der oberen Stufen (beim dargestellten Ausführungsbeispiel in Höhe der sechsten Stufe) zugeführt. In diesem Bereich findet im wesentlichen die Trocknung des Produktes statt. Angestrebt wird eine Restfeuchte von unter 5% H20. Sollte diese in den oberen beiden Stufen nicht erreicht werden, besteht zum einen die Möglichkeit, die Anzahl der Stufen der Luftwirbelmühle zu erhöhen. Zum anderen kann in einem dem Auslaß 4 nachgeschalteten Trockner jedweder Art die Restfeuchte auf den gewünschten Grad eingestellt werden. Beim dargestellten Ausführungsbeispiel ist ein mit dem Auslaß 4 verbundener Trockner 9 schematisch dargestellt. An diesen schließt sich ein an sich bekanntes Zyklonsystem 10 zur Trennung von Produkt und Luft an. The warm or hot air - e.g. with a temperature of 1 80 to 220 ° C - is only supplied at the level of the upper stages (in the illustrated embodiment at the level of the sixth stage). The drying of the product takes place in this area. A residual moisture of less than 5% H20 is aimed for. If this is not achieved in the top two stages, there is the possibility, on the one hand, of increasing the number of stages of the air vortex mill. On the other hand, the residual moisture can be set to the desired level in a dryer of any kind connected to the outlet 4. In the illustrated embodiment, a dryer 9 connected to the outlet 4 is shown schematically. This is followed by a cyclone system 10 known per se for separating product and air.

Claims

P a t e n t a n s p r u c hP a t e n t a n s r u c h
1 ) Verfahren zum Mahlen und Trocknen von Zellulose-Derivaten in einer Luftwirbelmühle ( 1 ), dadurch gekennzeichnet, daß das Produkt in nassem Zustand in die Luftwirbelmühle ( 1 ) gefördert wird, daß es in den ersten bzw. unteren Mahlzonen (8) der Luftwirbelmühle ( 1 ) als nasses Produkt kalt feingemahlen wird und daß der Trocknung dienende Warm-/ Heißluft erst weiteren, sich an die ersten Mahlzonen (-stufen) anschließenden Mahlzonen (-stufen) zugeführt wird.1) Method for grinding and drying cellulose derivatives in an air vortex mill (1), characterized in that the product is conveyed into the air vortex mill (1) when wet, that it is in the first or lower grinding zones (8) of the air vortex mill (1) is finely ground cold as a wet product and that the hot / hot air used for drying is only fed to further grinding zones (stages) which adjoin the first grinding zones (stages).
2) Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß im Bereich der unteren bis mittleren Mahlzonen (8) Wasser eingedüst wird.2) Method according to claim 1, characterized in that water is injected in the region of the lower to middle grinding zones (8).
3 ) Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß an mehreren Stellen (5 , 5 ' ) Wasser eingedüst wird.3) Method according to claim 2, characterized in that water is injected at several points (5, 5 ').
4) Verfahren nach Anspruch 1 , 2 oder 3 , dadurch gekennzeichnet, daß Warm-/Heißluft in Höhe der oberen Mahlzonen (8) zugeführt wird.4) Method according to claim 1, 2 or 3, characterized in that warm / hot air is supplied at the level of the upper grinding zones (8).
5) Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das Produkt und Umgebungsluft über einen unterhalb der untersten Mahlzone (8) gelegenen Einlaß (3 ) zugeführt werden.5) Method according to one of claims 1 to 4, characterized in that the product and ambient air are supplied via an inlet (3) located below the lowest grinding zone (8).
6) Verfahren nach Anspruch 5 , dadurch gekennzeichnet, daß Produkt auch noch bis zur Höhe der zweiten Mahlzone (8) zugeführt wird.6) Method according to claim 5, characterized in that product is also fed up to the level of the second grinding zone (8).
7) Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Zellulose mit einem Feuchtigkeitsgehalt von 60 bis 80%, vorzugsweise 60 bis 70%, als nasses Produkt in einem Luftstrom in den unteren Bereich einer von unten nach oben durchströmten Luftwirbelmühle ( 1 ) eingeführt wird, daß in die unteren bis mittleren Mahlzonen (8), in denen im wesentlichen der Zerkleinerungsprozeß stattfindet, Wasser zugeführt wird und daß in die oberen Mahlzonen (8), in denen im wesentlichen der Trocknungsprozeß stattfindet, Warm-/Heißluft zugeführt wird. 8) Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Produkt in einem der Luftwirbelmühle nachgeordneten Trockner (9) nachgetrocknet wird.7) Method according to one of the preceding claims, characterized in that the cellulose with a moisture content of 60 to 80%, preferably 60 to 70%, as a wet product in an air stream in the lower region of an air vortex mill through which the air flows from bottom to top. it is introduced that water is fed into the lower to middle grinding zones (8), in which essentially the comminution process takes place, and that hot / hot air is fed into the upper grinding zones (8), in which essentially the drying process takes place. 8) Method according to one of the preceding claims, characterized in that the product is post-dried in a dryer (9) arranged downstream of the air vortex mill.
9) Luftwirbelmühle ( 1 ) zur Durchführung des Verfahrens nach einem der vorhergehenden Verfahrensansprüche, dadurch gekennzeichnet, daß sie im unteren Bereich mit einem Produkt-/Luft-Einlaß (3 ), im unteren bis mittleren Bereich mit einem Wassereinlaß (5, 5 ') und im oberen Bereich mit einem Warm-/Heiß-Luft-Einlaß (6) ausgerüstet ist.9) Air vortex mill (1) for carrying out the method according to one of the preceding method claims, characterized in that it has a product / air inlet (3) in the lower region and a water inlet (5, 5 ') in the lower to middle region. and in the upper area is equipped with a warm / hot air inlet (6).
10) Luftwirbelmühle ( 1 ) nach Anspruch 9, dadurch gekennzeichnet, daß an ihren Auslaß (4) ein Trockner (9) angeschlossen ist, dem ein Zyklon-System ( 10) nachgeordnet ist.10) Air vortex mill (1) according to claim 9, characterized in that a dryer (9) is connected to its outlet (4), which is followed by a cyclone system (10).
1 1 ) Luftwirbelmühle ( 1 ) nach Anspruch 9 oder 10, dadurch gekennzeichnet, daß sie vom Typ ULTRA-ROTOR ist. 1 1) Air vortex mill (1) according to claim 9 or 10, characterized in that it is of the ULTRA-ROTOR type.
EP99924882A 1998-05-27 1999-05-05 Mill drying of cellulose derivatives, especially methylcellulose Expired - Lifetime EP1082174B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19823563 1998-05-27
DE19823563A DE19823563A1 (en) 1998-05-27 1998-05-27 Mill drying of cellulose derivatives, especially methyl cellulose
PCT/EP1999/003077 WO1999061157A1 (en) 1998-05-27 1999-05-05 Mill drying of cellulose derivatives, especially methylcellulose

Publications (2)

Publication Number Publication Date
EP1082174A1 true EP1082174A1 (en) 2001-03-14
EP1082174B1 EP1082174B1 (en) 2002-02-13

Family

ID=7869001

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99924882A Expired - Lifetime EP1082174B1 (en) 1998-05-27 1999-05-05 Mill drying of cellulose derivatives, especially methylcellulose

Country Status (3)

Country Link
EP (1) EP1082174B1 (en)
DE (2) DE19823563A1 (en)
WO (1) WO1999061157A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20021758U1 (en) * 2000-12-22 2002-05-08 Sniehotta Michael Impact mill with striking tools on a motor-driven rotor
DE102005032248B4 (en) * 2005-07-09 2009-04-23 Tronox Pigments Gmbh Titanium dioxide pigment production using an air vortex mill
DE102006006096A1 (en) * 2006-02-10 2007-08-16 Altenburger Maschinen Jäckering GmbH Apparatus and method for feeding moist and / or sticky products, in particular cellulose, in an air vortex mill
DE102006033791A1 (en) * 2006-07-19 2008-01-24 Prokon Nord Energiesysteme Gmbh Improved processes for the production of ethanol, gluten and bran from cereals
DE102010009894A1 (en) 2010-03-02 2011-09-08 Rolf Schatz Rotor grinding tool for use in rotor impact mills for fine grinding, drying or grind drying, coating or deagglomeration of wet or dry material, has integrated turbo wheel-air classifier
DE102014015964A1 (en) 2014-10-31 2016-06-16 Pallmann Maschinenfabrik Gmbh & Co. Kg Apparatus and method for processing feedstock

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3543370A1 (en) * 1985-12-07 1987-06-11 Jackering Altenburger Masch MILL WITH SEVERAL GRINDINGS
DE3811910C2 (en) * 1988-04-09 1997-04-10 Mahltechnik Goergens Gmbh Mill and method for grinding and drying a moist product simultaneously
DE3839831A1 (en) * 1988-11-25 1990-05-31 Hoechst Ag METHOD AND DEVICE FOR PRODUCT-FRIENDLY GRINDING AND SIMULTANEOUS DRYING OF DAMP CELLULOSE ETHERS
DE19641781A1 (en) * 1996-10-10 1998-04-16 Clariant Gmbh Method and device for the simultaneous grinding and drying of a ground material containing moist cellulose ether

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9961157A1 *

Also Published As

Publication number Publication date
DE59900869D1 (en) 2002-03-21
WO1999061157A1 (en) 1999-12-02
DE19823563A1 (en) 1999-12-02
EP1082174B1 (en) 2002-02-13

Similar Documents

Publication Publication Date Title
EP0603481B1 (en) Method and arrangement for milling grinding stock
EP0220681B1 (en) Device for grinding and milling damp brittle material
EP3154701B1 (en) Grinding system and method for comminution of grinding stock
DE3506486A1 (en) DEVICE FOR CRUSHING AND GRINDING SPROEDEN GROUND MATERIALS, FOR EXAMPLE Cement clinker, ore, coal or the like
DE3905123A1 (en) Sifter for sifting granular material and milling system with the activation of such a sifter
DE102006039775A1 (en) Sighting device for sifting granular material and Kreislaufmahlanlage with involvement of such a viewing device
EP3079828A1 (en) Closed-circuit grinding plant having a pre-classifier and a ball mill
EP0629448A2 (en) Installation and method for milling and sifting brittle material
DE10336801B4 (en) Process and plant for grinding iron ore or iron ore concentrate
EP1082174B1 (en) Mill drying of cellulose derivatives, especially methylcellulose
EP1850962B1 (en) Milling station and method for grinding milling material
DE1913440A1 (en) Method and device for grinding and sifting granular material, in particular cement
EP1786573B1 (en) Apparatus for classifying charge material
DE4224704C2 (en) Process and plant for crushing regrind
DE19533078A1 (en) Method and device for grinding and classifying regrind
EP0610573A2 (en) Grinding method and corresponding plant
EP0237641B1 (en) Comminuting plant for brittle material
WO2012126453A2 (en) Operating method for a jet mill plant and jet mill plant
EP1129781A1 (en) Method and arrangement for a two-stage sifting of granular material
EP0648539B1 (en) Closed circuit grinding plant
DE3711926A1 (en) Device for comminuting and grinding brittle material to be ground, such as cement clinker, ore, coal or the like
EP0614701A2 (en) Method and installation for milling brittle material within a bed of material
DE4015511A1 (en) SEPARATOR FOR SEPARATING PRODUCTS MILLED IN A MILL FROM A GAS FLOW
EP1339497B1 (en) Device and method for producing fine material from chemically active milled stock
DE2543691C2 (en) Jet mill

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20001128

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE DE ES FR GB IT NL SE

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

17Q First examination report despatched

Effective date: 20010405

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE DE ES FR GB IT NL SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20020213

REF Corresponds to:

Ref document number: 59900869

Country of ref document: DE

Date of ref document: 20020321

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 20020516

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20020731

Year of fee payment: 4

ET Fr: translation filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20020829

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20021114

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030505

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20031201

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20030505

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040130

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 20031201

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20090525

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 20090526

Year of fee payment: 11

BERE Be: lapsed

Owner name: ALTENBURGER MASCHINEN *JACKERING G.M.B.H.

Effective date: 20100531

EUG Se: european patent has lapsed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100531

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100506

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20140729

Year of fee payment: 16

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 59900869

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20151201