EP2060674A1 - Procédé de démoussage et/ou d'aération de liquides de processus d'une machine à papier - Google Patents

Procédé de démoussage et/ou d'aération de liquides de processus d'une machine à papier Download PDF

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Publication number
EP2060674A1
EP2060674A1 EP07022085A EP07022085A EP2060674A1 EP 2060674 A1 EP2060674 A1 EP 2060674A1 EP 07022085 A EP07022085 A EP 07022085A EP 07022085 A EP07022085 A EP 07022085A EP 2060674 A1 EP2060674 A1 EP 2060674A1
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EP
European Patent Office
Prior art keywords
range
ester
defoaming
mixing element
esters
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
EP07022085A
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German (de)
English (en)
Other versions
EP2060674B1 (fr
Inventor
Ivo Nägeli
Christoph Blickenstorfer
Daniel Kellenberger
Christoph A. Häusler
Erich J. Windhab
Andreas Baumann
Jeelani Shaik
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.)
Dr W Kolb AG
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Dr W Kolb 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.)
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Publication date
Application filed by Dr W Kolb AG filed Critical Dr W Kolb AG
Priority to EP07022085A priority Critical patent/EP2060674B1/fr
Priority to DE502007007079T priority patent/DE502007007079D1/de
Priority to AT07022085T priority patent/ATE507345T1/de
Publication of EP2060674A1 publication Critical patent/EP2060674A1/fr
Application granted granted Critical
Publication of EP2060674B1 publication Critical patent/EP2060674B1/fr
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/26—De-aeration of paper stock
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/06—Paper forming aids
    • D21H21/12—Defoamers

Definitions

  • the present invention relates to a method for supplying a means for venting / defoaming to a process liquid, in particular in a paper machine. Furthermore, the document relates to a device for carrying out such a method.
  • the process liquid is typically added, in a technological process, to an agent which prevents foaming or is able to decompose foam which has formed, and / or which vents the liquid, that is, which is capable of being present in the process liquid To remove air bubbles.
  • Another possibility is to treat the process liquid mechanically, for example by breaking the foam by spraying liquid or by other mechanical methods such as decoulsors. Frequently the chemical and physical methods are used in combination.
  • agents are mainly used in which the actual active ingredient is in the form of a suspension in water.
  • a suspension is produced, for example, by bringing a substance which is solid at room temperature to elevated temperature and liquefied and then emulsified in water in the presence of stabilizers, etc. Subsequently, the emulsion is cooled, wherein the emulsified droplets solidify and form a suspension (solid in liquid).
  • the invention is therefore based on the object of providing an improved method for supplying a means for venting / defoaming to a process fluid, in particular in a paper machine.
  • the solution to this problem is achieved in that the agent emulsifies in situ with the aid of at least one mixing element in water and the process liquid within less than 5 minutes, preferably less than 2 minutes, more preferably less than 1 minute, and if possible even within less is added as 30 seconds after the emulsification process.
  • the advantage of the proposed method is that it has surprisingly been found on the one hand that the agent, if it is not added as a concentrate but in controlled emulsified form, shows a significantly higher efficiency in the deaeration / defoaming.
  • emulsion is understood to mean a system of droplets of at least one water-immiscible, typically hydrophobic substance, namely the agent for deaeration / defoaming in water.
  • the droplets have an average diameter (median, d 50 ) of at most 150 ⁇ m, preferably of at most 100 ⁇ m.
  • a further advantage of the proposed method is that it essentially, as also proposed according to a first embodiment, substantially without or substantially reduced addition and / or presence of emulsifying and / or dispersing aids and / or emulsion and / or dispersion stabilizer is performed.
  • the preparation of an emulsion requires the presence of appropriate additives to maintain the emulsion at all after its formation, since normally the emulsified agent tends to aggregate and eventually become a film on the surface of the water.
  • This is not required in the proposed method, which is another great advantage, since typically such aids can on the one hand also interact with other processes and must be handled with care, and on the other hand can be critical in terms of environmental impact.
  • a specific mean droplet size of the emulsified agent according to a further embodiment is particularly suitable.
  • an excellent effect can be ensured if in the mixing element an average potty size (median, d 50 ) that in the emulsion existing emulsified droplets in the range of 0.1-80 microns, preferably in the range of 0.5-50 microns is generated.
  • Very good results can be produced if the average potty size is in the range of 1-10 ⁇ m, preferably in the range of 2-5 ⁇ m.
  • the means for deaeration / defoaming at 25 ° C should have a viscosity above 100, preferably above 200 mPas.
  • the agent should be able to be supplied to the mixing element at least in the liquid state. If appropriate, this can also be ensured with the aid of temporary heating of the agent before it is fed to the mixing element.
  • the deaerating / defoaming agent preferably has a viscosity below 2000, preferably below 1500 or 1000 mPas, and in particular at a temperature below 100 ° C., preferably below 60 ° C., particularly preferably below 30 ° C. , and most preferably in the range of 25 ° C, because in the latter case can be dispensed with an additional increased temperature of the agent prior to feeding to the mixing element.
  • the agent has a corresponding amount Viscosity in the range of 200-1000 mPas, particularly preferably in the range of 300-800 mPas and this at 25 ° C, since then the processing or providing the emulsion without unnecessary effort is possible and the droplets in the emulsion still show good activity.
  • the agent for deaeration / defoaming in water in a concentration of 0.1-80 weight percent, preferably 1-50, more preferably 5-20 percent by weight is present.
  • the final concentration of agent in the emulsified form in the process fluid, i. after the addition can be adjusted to the required effect and general conditions.
  • a paper machine which e.g. Fibers (for example, pulp, thick stock, thin material, white water)
  • the agent for deaerating / defoaming a process fluid with fiber content is added in an amount such that, based on the weight of finished material per production step, the average in the range of 30- 1000 ppm (by weight), preferably in the range of 100-500 ppm, particularly preferably in the range of 200-400 ppm, in each case per unit time considered.
  • finished product e.g., in t / h
  • the agent is then added appropriately (e.g., in kg / hr).
  • the mixing element is a turbulence mixer, completely preferably around a turbulence micromixer.
  • it may be a nozzle, in particular a Mikrostrahldispergierdüse.
  • a magnetic element or a static mixer or a combination of said mixing elements for example in series.
  • a droplet size distribution of the emulsified droplets present in the emulsion is produced in the mixing element, in which at least 70%, preferably at least 80%, particularly preferably at least 90% of the number of droplets have an average droplet size d 50 (median) in a range between d 50/10 to d 50 * 10 are distributed.
  • a mean droplet size d 50 of preferably 4 ⁇ m, for example, preferably 90% of the droplets are in a range between 0.4 ⁇ m and 40 ⁇ m.
  • a further preferred embodiment is characterized in that the agent is one or a mixture of substantially immiscible with water substance (s) (typically having a solubility in water at 25 ° C of at most 10 g per liter, preferably at most 5 g per liter, more preferably 1 g per liter).
  • water substance typically having a solubility in water at 25 ° C of at most 10 g per liter, preferably at most 5 g per liter, more preferably 1 g per liter.
  • they are typically hydrophobic systems, preference is given, for example, to surface-active substances, preferably non-ionic surface-active systems.
  • At least one of the components may have an ethoxylated and / or propoxylated and / or butoxylated structure, and / or have an ester structure, preferably a sorbitan ester structure, a glycol ester structure, and / or a polyethylene glycol structure, and / or a Polypropylene glycol structure and / or a fatty alcohol structure.
  • an ester structure preferably a sorbitan ester structure, a glycol ester structure, and / or a polyethylene glycol structure, and / or a Polypropylene glycol structure and / or a fatty alcohol structure.
  • ester structures are possible, such as, for example, polyol esters, trimethylolpropane esters, glycerol esters, glycol esters, pentaerythritol esters, fatty acid fatty alcohol esters, sugar-like esters, etc.
  • oily systems for example those based on glycerols.
  • diacid esters such as adipic acid esters, citric acid esters, etc.
  • ether systems such as propoxylated, ethoxylated and / or butoxylated systems (including corresponding mixed forms) such as ester-based (eg ester ethoxylates (EO Ester), ester-propoxylates (PO-esters), EO-PO-esters, fatty acid-ethoxylates (EO-FSE), PO-FSE, EO-PO-FSE, etc.).
  • the present invention relates to an apparatus for performing a method as described above.
  • a device is preferably characterized in that the device comprises at least one container or a supply line for providing the means for venting / defoaming and at least one container or a supply line for providing water, as well as at least one of these two fed mixing element to produce an emulsion and at least one introduction conduit of suitable brevity (or conveying speed) for adding to the process liquid substantially immediately after the emulsification process.
  • FIG. 1 is shown schematically a system for carrying out the proposed method.
  • the system has a container 1 with deaerator / defoamer.
  • This container can be tempered by a thermostat unit 4, typically above a temperature of 15-70 ° C. If higher-viscosity agents are used, then a temperature control to a higher temperature can be envisaged, but then it must be Care must be taken that also the lines are kept at least to the mixer at a corresponding temperature, so that the agent reaches the mixer in liquid form and does not solidify in the supply line to the mixer.
  • the device has a container 2 for water, but this can also be replaced by a water supply.
  • the container for water can be controlled by a thermostat unit 4, here typically for the range of a temperature of 5-60 ° C.
  • the two containers 1 and 2 are via lines 5 respectively. 6 connected to the mixing element 7.
  • a pump 3 is arranged as well as possible also a control element for controlling the pump, which, for example, the pump depending on the flow rate controls resp. which allows to adjust the mixer 7 supplied mass ratio according to the needs.
  • pressure measuring units 9 and temperature measuring units 10 are preferably arranged in lines 5, 6 in order to control the process.
  • the two lines 5, 6 are merged either in front of the mixer or in the mixer.
  • the actual emulsion is produced with the droplet size distributions and mean droplet sizes given above.
  • This mixer can be different constructions, for example. Turbulence micromixers, micro-jet dispersing nozzles, magnetic mixing elements or static mixers. They serve to produce an emulsion with a defined droplet size, with a narrow droplet size distribution, a simple application on site and low costs are sought.
  • the concentration of agent is 5% by weight and the flow rate is typically in the range of 20-200 liters per hour.
  • the emulsion produced is fed via the introduction line 16, which is typically equipped with additional control means, such as a temperature measuring unit 10, to the process liquid tank.
  • This container 11 may be any container or even a line for process fluids in a paper machine. By way of example, it is a process fluid which contains fibers (for example pulp, thick matter, thin material, white water, etc.).
  • test set-up was used, as described in FIG. 2 is shown schematically.
  • This test fluid was a slurry of about 90% by weight hot water, about 9% cellulose fiber suspension, some sodium sulfate solution, some starch and some polyethyleneamine and hydrochloric acid. The mixture was stirred well. About 1 liter was used in such a test setup.
  • FIG. 3a the course of the foam height in centimeters is shown as a function of time, on the one hand for a reference measurement without addition of defoamer / deaerator (referred to as ref), as well as the measurement of the foam height in centimeters with the addition of an appropriate agent.
  • ref defoamer / deaerator
  • FIG. 3b is shown as for comparison purposes the Difference between reference and actual measurement, in other words, air reduction in percent can be represented as a function of time. This illustration was used for the comparisons as they are in FIG. 4 are shown used.
  • FIG. 4 is the air reduction in percent for different systems as a function of time, determined in a test setup according to FIG. 2 represented. Different substances were used, with the exception of the curve indicated by the abbreviation suspends in each case the dashed curves for concentrate added means (not according to the invention) and the solid lines for according to the invention as emulsion immediately after their preparation added agent.
  • FIG. 4 can be recognized that the classically used in this context suspension (solid in liquid) shows a very bad effect and in particular after about 10 seconds, a significant foam formation begins. It should be noted that such suspensions are also used rather as deaerators and less as anti-foaming agents.
  • the air content in the test solution was determined via a compression measurement as a function of time in a circulation test with a container with foaming solution as described above and a pump flow rate of 30 liters per minute.
  • the circulation was first carried out for 15 minutes without deaerator, then the addition of the deaerator was made and the circulation continued for 30 minutes with the deaerator.
  • the temperature was also maintained at 50 ° C, the initial air content was 1%, and the amount of deaerator added, in two series of tests, was either 125 ppm or 375 ppm by weight of the fibers. Concentrate was added, 5% emulsion (weight percent) or suspension, the former and the latter for comparison.
  • FIG. 5 corresponding measurements for different concentrations are shown. Furthermore, the effectiveness of the suspension is shown. It can be seen that the suspension (denoted by S) shows good efficiency both at a concentration of 375 ppm (always solid line) and at a concentration of 125 ppm (always dashed line). Clearly, it can be seen that in the case of a concentrate as well as an emulsion, a higher concentration also leads to a higher effect. In the present case, the effectiveness of the concentrate is comparable to the effectiveness of the emulsion.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Colloid Chemistry (AREA)
EP07022085A 2007-11-14 2007-11-14 Procédé et dispositif de démoussage et/ou d'aération de liquides de processus d'une machine à papier Active EP2060674B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP07022085A EP2060674B1 (fr) 2007-11-14 2007-11-14 Procédé et dispositif de démoussage et/ou d'aération de liquides de processus d'une machine à papier
DE502007007079T DE502007007079D1 (de) 2007-11-14 2007-11-14 Verfahren und Vorrichtung zum Entschäumen und/oder Entlüften von Prozessflüssigkeiten einer Papiermaschine
AT07022085T ATE507345T1 (de) 2007-11-14 2007-11-14 Verfahren und vorrichtung zum entschäumen und/oder entlüften von prozessflüssigkeiten einer papiermaschine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07022085A EP2060674B1 (fr) 2007-11-14 2007-11-14 Procédé et dispositif de démoussage et/ou d'aération de liquides de processus d'une machine à papier

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EP2060674A1 true EP2060674A1 (fr) 2009-05-20
EP2060674B1 EP2060674B1 (fr) 2011-04-27

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EP (1) EP2060674B1 (fr)
AT (1) ATE507345T1 (fr)
DE (1) DE502007007079D1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010108858A1 (fr) * 2009-03-26 2010-09-30 Dr. W. Kolb Ag Agent de désaération d'une eau de traitement, en particulier lors de la fabrication de papier
WO2010108859A1 (fr) * 2009-03-26 2010-09-30 Dr. W. Kolb Ag Procédé de démoussage et/ou désaérage de liquides de traitement d'une machine à papier
WO2011104196A3 (fr) * 2010-02-23 2012-01-12 Wacker Chemie Ag Procédé permettant de dégazer des liquides

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19903546A1 (de) * 1999-01-29 2000-08-03 Basf Ag Entschäumer und/oder Entlüfter auf der Basis von Öl-in-Wasser-Dispersionen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19903546A1 (de) * 1999-01-29 2000-08-03 Basf Ag Entschäumer und/oder Entlüfter auf der Basis von Öl-in-Wasser-Dispersionen

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010108858A1 (fr) * 2009-03-26 2010-09-30 Dr. W. Kolb Ag Agent de désaération d'une eau de traitement, en particulier lors de la fabrication de papier
WO2010108859A1 (fr) * 2009-03-26 2010-09-30 Dr. W. Kolb Ag Procédé de démoussage et/ou désaérage de liquides de traitement d'une machine à papier
WO2011104196A3 (fr) * 2010-02-23 2012-01-12 Wacker Chemie Ag Procédé permettant de dégazer des liquides
US8563640B2 (en) 2010-02-23 2013-10-22 Wacker Chemie Ag Method for deaerating liquids
KR101409822B1 (ko) 2010-02-23 2014-06-19 와커 헤미 아게 액체의 탈기 방법

Also Published As

Publication number Publication date
ATE507345T1 (de) 2011-05-15
DE502007007079D1 (de) 2011-06-09
EP2060674B1 (fr) 2011-04-27

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