CA2445658A1 - Method and device for charging fibres contained in a fibrous suspension with calcium carbonate - Google Patents
Method and device for charging fibres contained in a fibrous suspension with calcium carbonate Download PDFInfo
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- CA2445658A1 CA2445658A1 CA002445658A CA2445658A CA2445658A1 CA 2445658 A1 CA2445658 A1 CA 2445658A1 CA 002445658 A CA002445658 A CA 002445658A CA 2445658 A CA2445658 A CA 2445658A CA 2445658 A1 CA2445658 A1 CA 2445658A1
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- Prior art keywords
- carbon dioxide
- reactor
- liquid carbon
- calcium carbonate
- calcium
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/18—Carbonates
- C01F11/181—Preparation of calcium carbonate by carbonation of aqueous solutions and characterised by control of the carbonation conditions
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/001—Modification of pulp properties
- D21C9/002—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives
- D21C9/004—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives inorganic compounds
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/70—Inorganic compounds forming new compounds in situ, e.g. within the pulp or paper, by chemical reaction with other substances added separately
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/675—Oxides, hydroxides or carbonates
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- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geology (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Paper (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
Abstract
The invention relates to a method for charging fibres contained in a fibrous suspension with calcium carbonate, by means of a chemical precipitation reaction, whereby calcium oxide and/or calcium hydroxide is added to the fibrous suspension and at least partly liquid carbon dioxide is injected int o the reactor to initiate the precipitation reaction, thus providing for a reaction of the starting materials calcium oxide or calcium hydroxide to giv e the reaction products calcium carbonate and water. The carbon dioxide can subsequently be added in liquid form or partly in liquid form and partly in gaseous form. A corresponding device for the charging of fibres is also described.
Description
METHOD AND DEUCE FOR LOADING FIBERS CONTAINED
IN A FLBROUS SUSPENSION WI'TII CALCIUM CARBONATE
Cross Reference to Related Annlicatious This is a continuation of prior PCT application No. PCT/EP0210I603, entitled "iVIETI~OD A.ND DEVICE FOR CHARGING FIBERS CONTAINED IN A FIBROUS
SUSPENSION WITH CALCIUM CARBONATE", filed February 15, 2002.
BACKGROUND OF THE INYENTYON
I. Field of tire invention.
The present in~renfior~ relates to a method and to a device for load~g of in'oers iiiat are contaio.ed in a fibrous suspension, with calcium carbonate by way of a chemical precipitation reaction.
IN A FLBROUS SUSPENSION WI'TII CALCIUM CARBONATE
Cross Reference to Related Annlicatious This is a continuation of prior PCT application No. PCT/EP0210I603, entitled "iVIETI~OD A.ND DEVICE FOR CHARGING FIBERS CONTAINED IN A FIBROUS
SUSPENSION WITH CALCIUM CARBONATE", filed February 15, 2002.
BACKGROUND OF THE INYENTYON
I. Field of tire invention.
The present in~renfior~ relates to a method and to a device for load~g of in'oers iiiat are contaio.ed in a fibrous suspension, with calcium carbonate by way of a chemical precipitation reaction.
2. Description. of the related art.
Loading with an additive, for example a filler, can occur through a chemical precipitation reaction, espe~cxally thzougl~ a so-called "Fiber LoadingT~" process, as described in addition to other publications, in U.S. Patent No. 5,223,090. In this type of "Fiber LoadingT~' process an additive, especially a filler, is deposited onto the moistened fiber surfaces of the fibrous material.
The fibers can for example be loaded with calcium carbonate. hforeover, calcium oxide andlor calcium hydroxide are added to the moist, disintegrated fibmus material so that at least a part of this associates itself with the water that is contained in the fibrous material. The so treated fibrous material is subsequently treated with carbon dioxide.
I-Iitherrto gaseous carbon dioxide was always exclusively added to the pulp in order to trigger the chemical precipitation reaction.
voroz~~.us SUMMARY OF THE INVENTION
The present invention provides an improved method as well as an improved device .for loading of fibers that are continued its a f brous suspension, with calcium carbonate by way o~F a chemical precipitation reaction, which especially facilitates better control of the reaction temperature.
The present invention compzises a method for loading the fibers that are contained in a fiber stock suspension. with calcium. carbonate by way of a chemical precipitation reaction, whereby calcium oxide andlor calcium hydroxide are added to xhe fiber stock suspension. In.
order to trigger the precipitation reaction at least par~fafy ~tq~.dd carbon 3i~: do i3 ~xjwi~;:~ irx~o 1~ the reactor thereby ensuring the transformation of the starting substance calcium dioxide or calcium hydroxide into the reaction products calcium carbonate and water.
When adding the medium that contains the calcium oxide andlor the calciurn~
hydroxide to the fiber stock suspension, a cherttical reaction with exothermal characte~zistic occurs, whereby the calcium hydroxide is added preferably in liquid form (milk of lime). The water that is 1.5 possibly embedded in or deposited on the fibexs which are contained in the fibrous stock suspension is not absolutely necessary for the start and conclusion of the chebaical reaction.
Based on this configuration, the reaction temperature can be controlled as desired by adding liquid carbon dioxide. The injected liquid carbon dioxide is ~ransfoz~med in part into a gaseous medium and in part into a solid medium, dry ice. The solid medium consists of very 20 small particles (particle mist) that have a diameter smaller than 3 mm and evaporate very quickly and transition from the solid state into floe gaseous state. T'hi.s is an exothexmal process. Since dry ice, that is solid carbon dioxide possesses the ability to transition directly from a solid state into a gaseous state without going thmugh a liquid phase, no energy expendituz~e is necessary in order to vaporize the liquid carbon dioxide. '1'.E~e excess reaction energy can be utilized to Vpx0277.US
convent carbon dioxide from i.ts solid state into the gaseous state. Not only is a new method for the production of calcium carbonate found, but especially also an optimum sequence for the loading of fibers is achieved.
The carbon dioxide can be added exclusively in liquid .form, or partially in liquid form and partially in a gaseous form. If the carbon dioxide is added partially in liquid form and partially in. a gaseous form, then the reaction temperature and thereby the crystalline form is adjusted preferably through the ratio of the volume of the liquid carbon dioxide component to tlae volume of the gaseous carbon dioxide component.
In accordance with an additional advantageous embd~3i:~e:~t ~i ~e pr~;~nt invention the reaction terrtperature is zegulated via the differential pressure Pa = Pcoa -PR between the liquid carbon dioxide and the reaction space where PR is the pressure in the reaction space. The digerer~tial pressure Po is selected preferably so that it is within a range of 0 < Ps < 100 bar and preferably in a range of 1 < Pa < 50 bar.
If the reaction temperature is lower than oz equal to 45° C then a rhombohedral crystallite form of the precipitated calcium carbonate emerges. However, if this reaction temperature is higher than 45° C then a scal.enohedron crystallite form of the precipitated calcium cazbonate emerges. One oz the other crystallite forms can be achieved, depending upon in which range the reaction, temperature is maintained.
The total. requirement of added carbon dioxide that includes, for example of a liquid and a gaseous component, results from a staichiometric consideration of the balance reaction:
Ca (OII)2+ Caz 0 CaC03 + H20 Ca0 + H20 + COz 0 CaCOa + H20 Liquid carbon dioxide in pressure vessels, for example bottles is nozm,ally under high .pressure to approximately 300 bar. Advazrtageously, the carbon dioxide can now be relieved into v010277.US
the reactor chamber so tiaat it cools down and in part becomes solid, in other words, transitions from the liquid state into the solid state o~ aggz~egation. and ices up. This causes a cooling action whereby the temperature of the exothermic balance reaction is influenced accordingly.
The greater the gaseous carbon dioxide content (COi), as well as the calcium hydroxide (Ca(OH)z) content, are the greater the reaction temperaxure can he, or vice versa. t~s already mentioned, tl~e tenoperature, or in other words the cooling action of the liquid carbon dioxide can be regulated as desired through the ratio between the voiume of the liquid carbon. dioxide content anal the volume of the gaseous content, as well as through the differential pressure between the liquid carbon dioxide and the reaction space. The larger the differential pressure, tt~ g~;.eaaeY the cooling effect, as long as equal volumes of carbon dioxide are considered. The liquid or gaseous carbon dioxide respectively is injected into the reactor advantageously through a valve.
When loadizag the ~tbers with calcium carbonate (CaC03) it is deposited oo, the moistened fiber surfaces by adding calcium oxide (Ca0) and/or calcium hydroxide (Ca(OH)Z) to the moist fiber material, whereby at least a part of which can associate itself with the water of tha h.brous stock volume. The thereby processed fiber material is then treated with carbon dioxide (C02).
The term "moistened fiber surfaces" may encompass all moistened surfaces of the individual fibers. This specifically also includes the scenario where the fibers are loaded with calcium carbonate or any other desired precipitation product on their outside surfaces as well as on their inside (Lumen).
Accordingly the fibers are loaded with the filler calcium carbonate, whereby the loading onto the moistened fiber surfaces occurs through a so-called "Fiber Loading"
process, as described in U.S. Patent No. 5,223,090. In this "Fiber LoadingTM" process the carbon dioxide with the calcium hydroxide reacts to water and calcium carbonate.
Loading with an additive, for example a filler, can occur through a chemical precipitation reaction, espe~cxally thzougl~ a so-called "Fiber LoadingT~" process, as described in addition to other publications, in U.S. Patent No. 5,223,090. In this type of "Fiber LoadingT~' process an additive, especially a filler, is deposited onto the moistened fiber surfaces of the fibrous material.
The fibers can for example be loaded with calcium carbonate. hforeover, calcium oxide andlor calcium hydroxide are added to the moist, disintegrated fibmus material so that at least a part of this associates itself with the water that is contained in the fibrous material. The so treated fibrous material is subsequently treated with carbon dioxide.
I-Iitherrto gaseous carbon dioxide was always exclusively added to the pulp in order to trigger the chemical precipitation reaction.
voroz~~.us SUMMARY OF THE INVENTION
The present invention provides an improved method as well as an improved device .for loading of fibers that are continued its a f brous suspension, with calcium carbonate by way o~F a chemical precipitation reaction, which especially facilitates better control of the reaction temperature.
The present invention compzises a method for loading the fibers that are contained in a fiber stock suspension. with calcium. carbonate by way of a chemical precipitation reaction, whereby calcium oxide andlor calcium hydroxide are added to xhe fiber stock suspension. In.
order to trigger the precipitation reaction at least par~fafy ~tq~.dd carbon 3i~: do i3 ~xjwi~;:~ irx~o 1~ the reactor thereby ensuring the transformation of the starting substance calcium dioxide or calcium hydroxide into the reaction products calcium carbonate and water.
When adding the medium that contains the calcium oxide andlor the calciurn~
hydroxide to the fiber stock suspension, a cherttical reaction with exothermal characte~zistic occurs, whereby the calcium hydroxide is added preferably in liquid form (milk of lime). The water that is 1.5 possibly embedded in or deposited on the fibexs which are contained in the fibrous stock suspension is not absolutely necessary for the start and conclusion of the chebaical reaction.
Based on this configuration, the reaction temperature can be controlled as desired by adding liquid carbon dioxide. The injected liquid carbon dioxide is ~ransfoz~med in part into a gaseous medium and in part into a solid medium, dry ice. The solid medium consists of very 20 small particles (particle mist) that have a diameter smaller than 3 mm and evaporate very quickly and transition from the solid state into floe gaseous state. T'hi.s is an exothexmal process. Since dry ice, that is solid carbon dioxide possesses the ability to transition directly from a solid state into a gaseous state without going thmugh a liquid phase, no energy expendituz~e is necessary in order to vaporize the liquid carbon dioxide. '1'.E~e excess reaction energy can be utilized to Vpx0277.US
convent carbon dioxide from i.ts solid state into the gaseous state. Not only is a new method for the production of calcium carbonate found, but especially also an optimum sequence for the loading of fibers is achieved.
The carbon dioxide can be added exclusively in liquid .form, or partially in liquid form and partially in a gaseous form. If the carbon dioxide is added partially in liquid form and partially in. a gaseous form, then the reaction temperature and thereby the crystalline form is adjusted preferably through the ratio of the volume of the liquid carbon dioxide component to tlae volume of the gaseous carbon dioxide component.
In accordance with an additional advantageous embd~3i:~e:~t ~i ~e pr~;~nt invention the reaction terrtperature is zegulated via the differential pressure Pa = Pcoa -PR between the liquid carbon dioxide and the reaction space where PR is the pressure in the reaction space. The digerer~tial pressure Po is selected preferably so that it is within a range of 0 < Ps < 100 bar and preferably in a range of 1 < Pa < 50 bar.
If the reaction temperature is lower than oz equal to 45° C then a rhombohedral crystallite form of the precipitated calcium carbonate emerges. However, if this reaction temperature is higher than 45° C then a scal.enohedron crystallite form of the precipitated calcium cazbonate emerges. One oz the other crystallite forms can be achieved, depending upon in which range the reaction, temperature is maintained.
The total. requirement of added carbon dioxide that includes, for example of a liquid and a gaseous component, results from a staichiometric consideration of the balance reaction:
Ca (OII)2+ Caz 0 CaC03 + H20 Ca0 + H20 + COz 0 CaCOa + H20 Liquid carbon dioxide in pressure vessels, for example bottles is nozm,ally under high .pressure to approximately 300 bar. Advazrtageously, the carbon dioxide can now be relieved into v010277.US
the reactor chamber so tiaat it cools down and in part becomes solid, in other words, transitions from the liquid state into the solid state o~ aggz~egation. and ices up. This causes a cooling action whereby the temperature of the exothermic balance reaction is influenced accordingly.
The greater the gaseous carbon dioxide content (COi), as well as the calcium hydroxide (Ca(OH)z) content, are the greater the reaction temperaxure can he, or vice versa. t~s already mentioned, tl~e tenoperature, or in other words the cooling action of the liquid carbon dioxide can be regulated as desired through the ratio between the voiume of the liquid carbon. dioxide content anal the volume of the gaseous content, as well as through the differential pressure between the liquid carbon dioxide and the reaction space. The larger the differential pressure, tt~ g~;.eaaeY the cooling effect, as long as equal volumes of carbon dioxide are considered. The liquid or gaseous carbon dioxide respectively is injected into the reactor advantageously through a valve.
When loadizag the ~tbers with calcium carbonate (CaC03) it is deposited oo, the moistened fiber surfaces by adding calcium oxide (Ca0) and/or calcium hydroxide (Ca(OH)Z) to the moist fiber material, whereby at least a part of which can associate itself with the water of tha h.brous stock volume. The thereby processed fiber material is then treated with carbon dioxide (C02).
The term "moistened fiber surfaces" may encompass all moistened surfaces of the individual fibers. This specifically also includes the scenario where the fibers are loaded with calcium carbonate or any other desired precipitation product on their outside surfaces as well as on their inside (Lumen).
Accordingly the fibers are loaded with the filler calcium carbonate, whereby the loading onto the moistened fiber surfaces occurs through a so-called "Fiber Loading"
process, as described in U.S. Patent No. 5,223,090. In this "Fiber LoadingTM" process the carbon dioxide with the calcium hydroxide reacts to water and calcium carbonate.
voroz~~.us The present inventive device for loading of fibers that are contained in a fiber stock suspension with calciunr~ carbonate by way of a chemical precipitation reaction accordingly includes elements through which calcium oxide andlor calcium hydroxide can be added to the fiber stock suspension. It further includes a reactor and elements through which at least partially liquid carbon dioxide can be injected into the reactor in order to trigger the precipitation reaction, thereby ezisuring a transformation of the starEing substances calcium oxide or calcium hydroxide into the reaction products calcium carbonate and water.
BRIEF pESC»TPTION OF TAE DRAGS
The above-mentioned and other features and advantage of t~"s inventicL, a~~d the manner of attaining them, will become more apparent and the invention will be better understood by reference to the following description of an embodiment of the invention taken in conjunction with the accompanying drawfn$,, which is a schematic view of an embodiment of the present invention. The exemplification set out herein illusixates orte preferred embodiment of the invention, in one form, and such exerrtplification is not to be construed as limiting the scope of the invention in any manner.
DET,~,ILED DESCRIPTION OF THE INDENTION
Referring now to the drawing, there is shown a purely schematic illustration of device 1.0 for loading of fibers 12 that are contained in a fiber stock suspension with calcium carbonate, by way of a chemical precipitation reaction.
Device 10 includes element 14 through which calcium oz~ide Ca0 and/or calcium hydroxide Ca(OI-i~2 can be added to the fiber stock suspension. Device 10 further includes a "Fiber Loading '~" reactor 16, as well as valve 18, through which the liquid carbo~a dioxide C02 can be injected into reactor 16.
BRIEF pESC»TPTION OF TAE DRAGS
The above-mentioned and other features and advantage of t~"s inventicL, a~~d the manner of attaining them, will become more apparent and the invention will be better understood by reference to the following description of an embodiment of the invention taken in conjunction with the accompanying drawfn$,, which is a schematic view of an embodiment of the present invention. The exemplification set out herein illusixates orte preferred embodiment of the invention, in one form, and such exerrtplification is not to be construed as limiting the scope of the invention in any manner.
DET,~,ILED DESCRIPTION OF THE INDENTION
Referring now to the drawing, there is shown a purely schematic illustration of device 1.0 for loading of fibers 12 that are contained in a fiber stock suspension with calcium carbonate, by way of a chemical precipitation reaction.
Device 10 includes element 14 through which calcium oz~ide Ca0 and/or calcium hydroxide Ca(OI-i~2 can be added to the fiber stock suspension. Device 10 further includes a "Fiber Loading '~" reactor 16, as well as valve 18, through which the liquid carbo~a dioxide C02 can be injected into reactor 16.
VOI0277.US
The carbon dioxide can. be added exclusively in a liquid state or in part in a liquid state, and in part in a gaseous state. In the second seenaxio an additional valve 20 is provided, through which gaseous carbon dioxide COz can be supplied to reactor 1, 6.
Device 10 can include cont~roa.ler 22 for the adjustment of reaction temperature TR and ratio control 24 by way of which the ratio (Voli;q";d j Vol,s) o~~ volume Vol,;q";d of the liquid carbon dioxide component and the volume Vol~~~ of the gaseous carbon dioxide component is appropriately variable for a corresponding adjustment of reaction temperature TR.
A, ratio controller 26 can be provided that is actuated by ratio control 24 and that determines the ratio of the flows through the two valves 18, 20 and ca~pates thei-n wig ~w desired value that was predetertr~ined by ratio control 24 ire order to then adjust this ratio accordingly. Controller 22 receives the actual value of, for example, reaction temperature TR via a corresponding measuring device 28. This actual value is compared with a desired value 30 in the controller 22.
Then ratio control 24 is accordingly supplied in order to deliver an appropriate desired ratio value to ratio controller 26.
The reaction temperature is adjustable also through differential pressure Pe =1'co2 - PR
between the liquid carbon. dioxide aid the reaction space in addition to being adjustable through the volume xatio of the liquid and the gaseous carbon dioxide components.
Reactor 16 then supplies fiber stock 32 that is loaded with, for example, calcium carbonate CaC43.
Calcium oxide and/or calcium hydroxide (slaked lime) is added to the fiber material in.
such a way that at least a portion of this can associate itself with the water that is contained in the ~~ber material, i.e. between the fibers, in the hollow fibers and in their walls, thus creating the following cheznicaI reaction:
Ca0 + H2~ -> Ca(OH)2 Slaking of caustic lime calcium hydroxide s vozoz~~.Us The fiber material is then treated with carbon dioxide (C02) in the relevant reactor, so that calcium carbonate (CaC03) is extensively deposited onto the moistened fiber surfaces. This results in the :following chemical reaction:
°'liiber Lvading'~'M": Ca(O~2 + C02 -~ CaCOz + H20 (Calcium carbonate + water) While this invention has been described as having a preferred design, the present invention can be further modified ravrithin the spirit and scope of this disclosure. This application is therefore intended tv cover any variations, uses, or adaptations of the invention using its general principles. Further, this application is enter_..dA~ to cover such deparh~es from the pre:~erii disclosure as come within known or customary practice in the art to which this invention pertains and which fall within the limits of the appended claims.
vozoz~~.Us Component I---dent~fication Device 12 Fibers 5 14 Means for adding calcium oxide and/or calcium hydroxide 16 Reaatox 18 Valve z4 Valve 10 22 Controller 24 Ratyo control 2~ Ratio controller 28 Meastu7tng device 30 Desired value 32 Loaded fiber stock PR Pressure in the reaction space TR Reaction temperature VOT.a277.US
The carbon dioxide can. be added exclusively in a liquid state or in part in a liquid state, and in part in a gaseous state. In the second seenaxio an additional valve 20 is provided, through which gaseous carbon dioxide COz can be supplied to reactor 1, 6.
Device 10 can include cont~roa.ler 22 for the adjustment of reaction temperature TR and ratio control 24 by way of which the ratio (Voli;q";d j Vol,s) o~~ volume Vol,;q";d of the liquid carbon dioxide component and the volume Vol~~~ of the gaseous carbon dioxide component is appropriately variable for a corresponding adjustment of reaction temperature TR.
A, ratio controller 26 can be provided that is actuated by ratio control 24 and that determines the ratio of the flows through the two valves 18, 20 and ca~pates thei-n wig ~w desired value that was predetertr~ined by ratio control 24 ire order to then adjust this ratio accordingly. Controller 22 receives the actual value of, for example, reaction temperature TR via a corresponding measuring device 28. This actual value is compared with a desired value 30 in the controller 22.
Then ratio control 24 is accordingly supplied in order to deliver an appropriate desired ratio value to ratio controller 26.
The reaction temperature is adjustable also through differential pressure Pe =1'co2 - PR
between the liquid carbon. dioxide aid the reaction space in addition to being adjustable through the volume xatio of the liquid and the gaseous carbon dioxide components.
Reactor 16 then supplies fiber stock 32 that is loaded with, for example, calcium carbonate CaC43.
Calcium oxide and/or calcium hydroxide (slaked lime) is added to the fiber material in.
such a way that at least a portion of this can associate itself with the water that is contained in the ~~ber material, i.e. between the fibers, in the hollow fibers and in their walls, thus creating the following cheznicaI reaction:
Ca0 + H2~ -> Ca(OH)2 Slaking of caustic lime calcium hydroxide s vozoz~~.Us The fiber material is then treated with carbon dioxide (C02) in the relevant reactor, so that calcium carbonate (CaC03) is extensively deposited onto the moistened fiber surfaces. This results in the :following chemical reaction:
°'liiber Lvading'~'M": Ca(O~2 + C02 -~ CaCOz + H20 (Calcium carbonate + water) While this invention has been described as having a preferred design, the present invention can be further modified ravrithin the spirit and scope of this disclosure. This application is therefore intended tv cover any variations, uses, or adaptations of the invention using its general principles. Further, this application is enter_..dA~ to cover such deparh~es from the pre:~erii disclosure as come within known or customary practice in the art to which this invention pertains and which fall within the limits of the appended claims.
vozoz~~.Us Component I---dent~fication Device 12 Fibers 5 14 Means for adding calcium oxide and/or calcium hydroxide 16 Reaatox 18 Valve z4 Valve 10 22 Controller 24 Ratyo control 2~ Ratio controller 28 Meastu7tng device 30 Desired value 32 Loaded fiber stock PR Pressure in the reaction space TR Reaction temperature VOT.a277.US
Claims (22)
1. A method for loading fibers in a fiber stock suspension with calcium carbonate by way of a chemical precipitation reaction, comprising the steps of:
adding at least one of a calcium oxide and a calcium hydroxide to the fiber stock suspension;
injecting an at least partially liquid carbon dioxide into a reactor; and transforming said at least one of calcium oxide and calcium hydroxide into a plurality of reaction products including calcium carbonate and water.
adding at least one of a calcium oxide and a calcium hydroxide to the fiber stock suspension;
injecting an at least partially liquid carbon dioxide into a reactor; and transforming said at least one of calcium oxide and calcium hydroxide into a plurality of reaction products including calcium carbonate and water.
2. The method of claim 1, wherein said at least partially liquid carbon dioxide is exclusively liquid carbon dioxide.
3. The method of claim 1, wherein said at least partially liquid carbon dioxide includes a gaseous liquid carbon dioxide.
4. The method of claim 3, further including the step of adjusting both a reaction temperature in said reactor and s crystalline form of the calcium carbonate through a ratio of a volume of said liquid carbon dioxide to a volume of said gaseous carbon dioxide.
5. The method of claim 1, further including the step of regulating a reaction temperature in said reactor via a differential pressure P.DELTA. = P CO2 - P between said liquid carbon dioxide and a reaction space in said reactor.
6. The method of claim 5, wherein said differential pressure P.DELTA. is approximately between 0 bar and 100 bar.
7. The method of claim 5, wherein said differential pressure P.DELTA. is approximately between 1 bar and 50 bar.
8. The method of claim 1, further including the step of achieving a rhombohedral crystallite form of the calcium carbonate by keeping a reaction temperature in said reactor no greater than 45°C.
9. The method of claim 1, further including the step of achieving a scalenohedron crystallite form of the calcium carbonate by keeping a reaction temperature in said reactor greater than 45°C.
10. The method of claim 1, further including the step of cooling down said carbon dioxide by relieving said carbon dioxide into said reactor thereby creating an at least partially solid carbon dioxide.
11. The method of claim 1, wherein said or least partially liquid carbon dioxide is injected into said reactor through a valve.
12. A device for loading a plurality of fibers that are contained in a fiber stock suspension with calcium carbonate by way of a chemical precipitation reaction, comprising:
at least one first adding element through which at least one of calcium oxide and calcium hydroxide are added to the fiber stock suspension;
a reactor connected to said at least one first adding element; and at least one second adding element connected to said reactor; said at least one second adding element through which at least partially liquid carbon dioxide is injected into said reactor in order to trigger a precipitation reaction, thereby transforming said at least one of calcium oxide and calcium hydroxide into a plurality of reaction products including a calcium carbonate and water.
at least one first adding element through which at least one of calcium oxide and calcium hydroxide are added to the fiber stock suspension;
a reactor connected to said at least one first adding element; and at least one second adding element connected to said reactor; said at least one second adding element through which at least partially liquid carbon dioxide is injected into said reactor in order to trigger a precipitation reaction, thereby transforming said at least one of calcium oxide and calcium hydroxide into a plurality of reaction products including a calcium carbonate and water.
13. The device of claim 12, wherein said at least partially liquid carbon dioxide is exclusively liquid carbon dioxide.
14. The device of claim 12, wherein said at least partially liquid carbon dioxide includes a gaseous liquid carbon dioxide.
15. The device of claim 14, wherein both a reaction temperature in said reactor and a crystalline form of the calcium carbonate are adjusted through a ratio of a volume of said liquid carbon dioxide to a volume of said gaseous carbon dioxide.
16. The device of claim 12, wherein a reaction temperature in said reactor is regulated via a differential pressure P~ = P CO2 - P R between said liquid carbon dioxide and a reaction space in said reactor.
17. The device of claim 16, wherein said differential pressure P.DELTA. is approximately between 0 bar and 100 bar.
18. The device of claim 16, wherein said differential pressure P.DELTA. is approximately between 1 bar and 50 bar.
19. The device of claim 12, wherein a rhombohedral crystallite form of the calcium.
carbonate is achieved by keeping a reaction temperature in said reactor no greater than 45° C.
carbonate is achieved by keeping a reaction temperature in said reactor no greater than 45° C.
20. The device of claim 12, wherein a scalenohedron crystallite form of the calcium carbonate is achieved by keeping a reaction temperature in said reactor greater than 45° C.
21. The device of claim 12, wherein said carbon dioxide is relieved into said reactor cooling said carbon dioxide thereby creating an at least partially solid carbon dioxide.
22. The device of claim 12, wherein said at least partially liquid carbon dioxide is injected into said reactor through a valve.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10120635A DE10120635A1 (en) | 2001-04-27 | 2001-04-27 | Method and device for loading fibers with calcium carbonate |
| DE10120635.6 | 2001-04-27 | ||
| PCT/EP2002/001603 WO2002088466A1 (en) | 2001-04-27 | 2002-02-15 | Method and device for charging fibres contained in a fibrous suspension with calcium carbonate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2445658A1 true CA2445658A1 (en) | 2002-11-07 |
Family
ID=7682916
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002445658A Abandoned CA2445658A1 (en) | 2001-04-27 | 2002-02-15 | Method and device for charging fibres contained in a fibrous suspension with calcium carbonate |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20040154770A1 (en) |
| EP (1) | EP1386036A1 (en) |
| CA (1) | CA2445658A1 (en) |
| DE (1) | DE10120635A1 (en) |
| WO (1) | WO2002088466A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023077223A1 (en) * | 2021-11-03 | 2023-05-11 | Biosenta Inc. | Method and apparatus for producing core-shell calcium hydroxide-calcium carbonate particles |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040108083A1 (en) * | 2002-12-09 | 2004-06-10 | Specialty Minerals (Michigan) Inc. | Filler-fiber composite |
| DE10302783A1 (en) * | 2003-01-24 | 2004-08-12 | Voith Paper Patent Gmbh | Process for producing a fiber suspension intended for the production of a tissue or hygiene web |
| DE10317719A1 (en) * | 2003-04-17 | 2004-11-11 | Voith Paper Patent Gmbh | Introducing calcium carbonate into cellulosic, fibrous papermaking suspension, adds calcium hydroxide, de-waters and injects carbon dioxide to precipitate carbonate in moist suspension |
| DE10325688A1 (en) * | 2003-06-06 | 2004-12-23 | Voith Paper Patent Gmbh | Process to precipitate bulk calcium carbonate in a fibrous suspension by admixture of liquid or solid calcium hydroxide, or calcium oxide |
| DE10347920A1 (en) * | 2003-10-15 | 2005-05-19 | Voith Paper Patent Gmbh | Method and device for loading a pulp suspension |
| DE102004045089A1 (en) * | 2004-09-17 | 2006-03-23 | Voith Paper Patent Gmbh | Method and device for loading a pulp suspension |
| WO2007006369A1 (en) * | 2005-07-14 | 2007-01-18 | Voith Patent Gmbh | Method and device for loading fibres in a fibre suspension with filler |
| EP1795502A1 (en) * | 2005-12-12 | 2007-06-13 | SOLVAY (Société Anonyme) | Particles of precipitated calcium carbonate, process for making the particles and use of the particles as filler |
| FI126072B (en) | 2013-03-18 | 2016-06-15 | Linde Ag | Fiber filling method |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US35460A (en) * | 1862-06-03 | Improvement in coal-oil and other lamps | ||
| US5223090A (en) * | 1991-03-06 | 1993-06-29 | The United States Of America As Represented By The Secretary Of Agriculture | Method for fiber loading a chemical compound |
| WO1992021613A1 (en) * | 1991-06-04 | 1992-12-10 | Minerals Technologies, Inc. | Precipitated calcium carbonate particles from basic calcium carbonate |
| US5679220A (en) * | 1995-01-19 | 1997-10-21 | International Paper Company | Process for enhanced deposition and retention of particulate filler on papermaking fibers |
| US5665205A (en) * | 1995-01-19 | 1997-09-09 | International Paper Company | Method for improving brightness and cleanliness of secondary fibers for paper and paperboard manufacture |
| FI100670B (en) * | 1996-02-20 | 1998-01-30 | Metsae Serla Oy | Process for adding filler to cellulose fiber based m assa |
| AT403043B (en) * | 1996-04-03 | 1997-10-27 | Unitechnik Thurner Anlagenbaug | METHOD FOR THE CONTINUOUS PRODUCTION OF FALLED CALCIUM CARBONATE |
| WO1999051525A1 (en) * | 1998-04-07 | 1999-10-14 | Fp-Pigments Oy | Process and apparatus for producing precipitated calcium carbonate |
| FI105052B (en) * | 1998-07-08 | 2000-05-31 | Valmet Corp | Process for making paper, apparatus for carrying out the process and a paper product made by the process |
| FI104003B1 (en) * | 1999-02-08 | 1999-10-29 | Aga Ab | Stabilized filler, its production and use |
| AU5875700A (en) * | 1999-06-18 | 2001-01-09 | Imerys Pigments, Inc. | Pigment materials and their preparation and use |
| US6355138B1 (en) * | 2000-02-24 | 2002-03-12 | Voith Sulzer Paper Technology North America, Inc. | Method of chemically loading fibers in a fiber suspension |
| AU2001235934A1 (en) * | 2000-03-06 | 2001-09-17 | 3P Technologies Ltd. | Precipitated aragonite and a process for producing it |
| DE10033979A1 (en) * | 2000-07-13 | 2002-01-24 | Voith Paper Patent Gmbh | Method for loading fibers with calcium carbonate |
| US6413365B1 (en) * | 2001-07-11 | 2002-07-02 | Voith Paper Patent Gmbh | Method of loading a fiber suspension with calcium carbonate |
-
2001
- 2001-04-27 DE DE10120635A patent/DE10120635A1/en not_active Withdrawn
-
2002
- 2002-02-15 EP EP02701279A patent/EP1386036A1/en not_active Withdrawn
- 2002-02-15 CA CA002445658A patent/CA2445658A1/en not_active Abandoned
- 2002-02-15 WO PCT/EP2002/001603 patent/WO2002088466A1/en not_active Application Discontinuation
-
2003
- 2003-10-22 US US10/691,247 patent/US20040154770A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023077223A1 (en) * | 2021-11-03 | 2023-05-11 | Biosenta Inc. | Method and apparatus for producing core-shell calcium hydroxide-calcium carbonate particles |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1386036A1 (en) | 2004-02-04 |
| US20040154770A1 (en) | 2004-08-12 |
| WO2002088466A1 (en) | 2002-11-07 |
| DE10120635A1 (en) | 2002-10-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |