WO2021252572A1 - Surface mineralized organic fibers and methods of making the same - Google Patents
Surface mineralized organic fibers and methods of making the same Download PDFInfo
- Publication number
- WO2021252572A1 WO2021252572A1 PCT/US2021/036533 US2021036533W WO2021252572A1 WO 2021252572 A1 WO2021252572 A1 WO 2021252572A1 US 2021036533 W US2021036533 W US 2021036533W WO 2021252572 A1 WO2021252572 A1 WO 2021252572A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fiber
- fibers
- calcium carbonate
- mineralized
- slurry
- Prior art date
Links
- 239000000835 fiber Substances 0.000 title claims abstract description 179
- 238000000034 method Methods 0.000 title claims description 54
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 143
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 69
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 32
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 28
- 239000002002 slurry Substances 0.000 claims description 24
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 22
- 239000000292 calcium oxide Substances 0.000 claims description 21
- 239000002655 kraft paper Substances 0.000 claims description 13
- 229910052979 sodium sulfide Inorganic materials 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 244000166124 Eucalyptus globulus Species 0.000 claims description 7
- 238000005452 bending Methods 0.000 claims description 7
- 238000005406 washing Methods 0.000 claims description 4
- 241000218657 Picea Species 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 2
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 claims 4
- 238000010438 heat treatment Methods 0.000 claims 1
- 239000011248 coating agent Substances 0.000 abstract description 7
- 238000000576 coating method Methods 0.000 abstract description 7
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 30
- 235000012255 calcium oxide Nutrition 0.000 description 15
- 239000000945 filler Substances 0.000 description 15
- 239000000123 paper Substances 0.000 description 15
- 239000000203 mixture Substances 0.000 description 14
- 230000033558 biomineral tissue development Effects 0.000 description 13
- 239000002131 composite material Substances 0.000 description 11
- 229940088417 precipitated calcium carbonate Drugs 0.000 description 9
- 239000000047 product Substances 0.000 description 8
- 235000011121 sodium hydroxide Nutrition 0.000 description 8
- 239000000920 calcium hydroxide Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- VDQVEACBQKUUSU-UHFFFAOYSA-M disodium;sulfanide Chemical compound [Na+].[Na+].[SH-] VDQVEACBQKUUSU-UHFFFAOYSA-M 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- 238000010348 incorporation Methods 0.000 description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 description 5
- 239000011707 mineral Substances 0.000 description 5
- 238000013019 agitation Methods 0.000 description 4
- 235000011116 calcium hydroxide Nutrition 0.000 description 4
- 238000001878 scanning electron micrograph Methods 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- 229920003043 Cellulose fiber Polymers 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 3
- 229920002678 cellulose Polymers 0.000 description 3
- 239000001913 cellulose Substances 0.000 description 3
- 238000001764 infiltration Methods 0.000 description 3
- 230000008595 infiltration Effects 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 238000007790 scraping Methods 0.000 description 3
- 239000008399 tap water Substances 0.000 description 3
- 235000020679 tap water Nutrition 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 125000000129 anionic group Chemical group 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000004537 pulping Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 229920002522 Wood fibre Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229920006320 anionic starch Polymers 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000004380 ashing Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 238000009993 causticizing Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000001815 facial effect Effects 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000011121 hardwood Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000011174 lab scale experimental method Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000012764 mineral filler Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 230000002572 peristaltic effect Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 239000002025 wood fiber Substances 0.000 description 1
Classifications
-
- 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
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/32—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond
- D06M11/36—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond with oxides, hydroxides or mixed oxides; with salts derived from anions with an amphoteric element-oxygen bond
- D06M11/44—Oxides or hydroxides of elements of Groups 2 or 12 of the Periodic System; Zincates; Cadmates
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/73—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with carbon or compounds thereof
- D06M11/76—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with carbon or compounds thereof with carbon oxides or carbonates
-
- 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
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/02—Natural fibres, other than mineral fibres
- D06M2101/04—Vegetal fibres
- D06M2101/06—Vegetal fibres cellulosic
Definitions
- the disclosure generally relates to surface mineralized organic fibers and methods of making the same, and more particularly to organic fibers coated with calcium carbonate and methods of coating organic fibers.
- Cellulose-calcium carbonate composite materials have been used in the paper industry as filler material.
- Conventional cellulose-calcium carbonate materials incorporate the calcium carbonate such that the essential fibrous nature of the cellulose component is maintained. It was generally recognized in the art that the fibrous nature of the composite materials was needed to better incorporate the composite materials in the fiber matrix of paper.
- WO 97/01670 A1 relates to a filler used in papermaking and consisting primarily of calcium carbonate.
- the filler disclosed therein is porous aggregates of calcium carbonate particles, which are precipitated on the surface of fibers, e.g., cellulose fibers.
- the fillers described are based on the fact that calcium carbonate can be precipitated on the very fine fibers so that it adheres to the fibers. Among other things, this is due to the great fineness of the fibers, which have a length of max. 400 pm.
- EP 0 930 345 A2 and EP 0 935020 A1 disclose fillers similar to those described in WO 97/01670 A1 , but wherein the calcium carbonate is not precipitated on the surface of the fibers but instead is mixed with them. These references teach that not only previously precipitated calcium carbonate may be used but also natural ground calcium carbonate may be used.
- the fibers have a fineness similar to that mentioned above, namely at most a P50 screen fraction, i.e., a maximum length of about 300 pm.
- WO 98/35095 discloses a method for making paper, which comprises mixing an aqueous slurry of mineral filler with an aqueous slurry of wood fibers and the addition of flocculants wherein an essential portion of the filler is in the interior of the cellulose fibers.
- the filler and the flocculant are added to the pulp fibers independently of one another.
- the fillers are flocculated within the fibers and are kept in the interior, while the filler forms agglomerates outside of the fibers.
- the use of a binder which produces a uniform distribution of the filler on the surface of the fibers is not mentioned here either.
- WO 99/14432 discloses a method for making paper by mixing anionic starch, carboxymethylcellulose or other polymeric binders together with a cationic inorganic or polymeric coagulant to form a thin cellulose pulp stock, and this suspension is then flocculated by means of an anionic swellable clay or other anionic retention aids.
- Figure 1 is a photomicrograph showing free fibers at the surface of tissue paper
- Figure 2 is a graph showing panel scores for softness as a function of free fibers on a surface as disclosed in U.S. Patent No. 4,300,981 ;
- Figure 3 is a schematic illustration of sodium and calcium loops in a kraft pulp mill
- Figure 4 is a schematic illustration of an embodiment of a method of the disclosure.
- Figure 5 includes scanning electron microscopy (SEM) images of fibers before and after surface mineralization by a method in accordance with the disclosure
- Figure 6 include scanning electron microscopy (SEM) images of fibers before and after precipitation of calcium carbonate on the surface of the fibers by a conventional method;
- Figure 7 is a graph comparing bulk properties as a function of the content surface- mineralized organic fiber in a tissue product
- Figure 8A is a scanning electron microscopy (SEM) image of a handsheet made by a conventional process using standard PCC filler as an additive;
- Figure 8B is a scanning electron microscopy (SEM) image of a handsheet made using a 50/50 blend of standard pulp fiber and mineralized fiber in accordance with the disclosure;
- Figure 9 is a graph showing the sheet bulk for a sheet prepared with mineralized fibers as compared to the starting (unmineralized) fibers; and [0019] Figure 10 is a graph showing the mineralization efficiency as a function of specific surface area of the starting fiber.
- the organic fibers can be coated and entrained with an outer calcium carbonate coating.
- the organic fibers can include or can be cellulosic fibers. Any pulp fiber can be included.
- the pulp fiber can be Eucalyptus, Birch, Acacia, Aspen, Pine, Spruce, mixed tropical hardwood, old corrugated cardboard recycled fiber, and combinations thereof.
- the outer calcium carbonate coating is provided as a shell around a cellulosic fiber core.
- Embodiments of the disclosure can also include calcium carbonate infiltration into the cellulosic fiber core as well as in a shell structure. Surface strands of the fibers can be entrained or coated with the calcium carbonate.
- the fiber can have a hollow interior. Mineralization in accordance with the disclosure can result in calcium carbonate infiltrating into the hollow interior as well as coating surface strands and forming a shell around the fiber core.
- Entrainment of the organic fibers as disclosed herein has advantageously been found to increase bending stiffness of the fibers, which can lead to improved performance in a variety of applications, such as in papermaking and particularly paper intended for use in printing and hygienic applications. Such entrainment and/or infiltration of the calcium carbonate into the fiber cannot be achieved when adding calcium carbonate as a filler separately in the papermaking process.
- the surface- mineralized organic fibers can be incorporated into the fiber paper matrix despite the increase bending stiffness and that certain properties may be enhanced.
- tissue paper products incorporation of the surface-mineralized organic fibers of the disclosure can allow for improved softness. This is contrary to conventional understanding that the fibrous nature of the organic fiber filler was needed for proper incorporation into the fiber matrix of paper.
- FIG. 7 illustrates the effect of the degree of mineralization. It was found that a degree of mineralization of 60% (that is incorporation of 60% of the surface-mineralized organic fibers with 40% standard pulp fiber (referenced as MinFib in Figure 7)) significantly improved bulk as compared to a control paper having no surface-mineralized organic fibers. It was surprisingly found that highest bulk properties were found with correspondingly high total ash level in the sheet, which is contrary to conventional expectation in the art.
- Figure 9 illustrates the bulk improvement resulting from mineralized fibers of the disclosure. At 10% and 25% mineralization as compared to the fiber alone.
- a degree of mineralization of greater than 12% i.e., greater than 12% surface-mineralized organic fibers based on the total fiber content.
- embodiments of the disclosure can have tissue products made using a degree of mineralization of about 20% to about 70% by inclusion of about 20% to about 70 % surface-mineralized organic fibers of the total fiber content.
- FIG. 1 shows a photomicrograph of free fibers extending from the surface of piece of tissue paper.
- U.S. Patent No. 4,300,981 discloses the results of panel testing of tissue softness. The test panel rated various tissues as “softer” as the number of free fibers at the surface increased.
- the surface-mineralized fibers of the disclosure can be used to increase the number of free fibers at the surface of tissue papers. While not wishing to be bound by any particular theory, it is believed that enhanced stiffness of the individual mineralized fibers prevent non-mineralized fibers from forming the natural hydrogen bonds that give paper its structural integrity and instead be provided as free fibers. Although it is counter-intuitive, in this manner the stiffer mineralized fibers lend themselves to overall increased softness in the bulk tissue sheet. Referring to Figures 8A and 8B, it can be seen that increased free fiber is achieved in a tissue product having the surface mineralized fibers as compared to precipitated calcium carbonate added to the tissue product by conventional methods.
- the fiber used was Eucalyptus.
- the precipitated calcium carbonate was present in an amount of 20% and the fiber was present in an amount of 80% based on the total weight of the composition.
- the conventional sample of Figure 8A had an ash content of 10.7%.
- the composition in accordance with the disclosure included 50% surface-mineralized fiber and 50% Eucalyptus native fiber.
- the surface mineralized fiber was prepared by the methods of the disclosure to have a calcium carbonate shell around a Eucalyptus fiber as well as infiltration of the calcium carbonate into fiber an entrainment of the fibers with the calcium carbonate.
- the ash content of this composition was 32.4%.
- Methods of making surface-mineralized organic fibers can include admixing fibers with sodium carbonate to form a fiber slurry.
- the fibers can be an aqueous slurry and the sodium carbonate source can be a green liquor.
- the sodium carbonate can be provided as an aqueous solution.
- the sodium carbonate source can be a mixture of Na 2 C0 3 /Na 2 S/H 2 0.
- dry CaO is added until the stoichiometric amount of CaO is less than the stoichiometric amount of sodium carbonate (Na 2 C0 3 ) required for the CaO to fully react with the sodium carbonate.
- the resulting mixture is mixed for sufficient time for the causticization reaction (1) to be essentially complete.
- the causticization reaction is as follows.
- CaO + Na 2 C0 3 /Na 2 S/H 2 0 ⁇ > CaC0 3 + surface mineralized fiber + 2 Na0H/Na 2 S/H 2 0
- the causticization reaction results in fibers coated with the calcium carbonate (surface mineralized fibers), free calcium carbonate, and a mixture of Na0H/Na 2 S/H 2 0, which is the composition of white liquor.
- NaOH results as the by-product.
- the method can further include separating the surface mineralized fiber from sodium hydroxide or the white liquor and the excess calcium carbonate. This can be done, for example, by passing the resulting mixture from the causticization reaction over a screen.
- the collected surface mineralized fiber can then be washed with water to separate any remaining excess calcium carbonate.
- the washed surface mineralized fiber can then be collected.
- the method can be performed as part of the kraft process of a pulp mill, which can allow for the white liquor, excess calcium carbonate, and weak wash to be recycled into the kraft process.
- the method can further include scraping a portion of the calcium carbonate shell from the surface of the surface-mineralized organic fibers. Without intending to be bound by theory, it is believed that scraping of a portion of the calcium carbonate shell can improve fiber to fiber bonding when used as a filler. Scraping can be performed to remove a portion of the calcium carbonate without adversely affecting the bending stiffness of the surface-mineralized fiber.
- Methods of making surface-mineralized organic fibers disclosed herein can allow for rapid formation of the mineralized fiber composite to limit losses of unreacted soluble ions by recycling them back into the process for reuse.
- precipitation of precipitated calcium carbonate (PCC) in the presence of cellulose pulp fiber is an inherently ineffective process because the viscosity of the aqueous slurry of pulp fiber is very high if the fiber is present in an amount greater than about 1 wt%.
- Such high viscosity detrimentally prevents calcium (Ca 2+ ) ions that are added to the slurry from freely coming into contact with dissolved carbonate (C0 3 2 ) ions; such contact being necessary for calcium carbonate to precipitate.
- Embodiments of methods of the disclosure take advantage of processes normally done in every pulp mill that utilizes the kraft pulping process.
- black liquor coming from the pulp digester is converted to green liquor containing a high concentration of dissolved sodium carbonate (Na 2 C0 3 ).
- the green liquor is then converted to white liquor by causticizing it with quicklime (CaO) so that the sodium carbonate is substantially converted to sodium hydroxide (NaOFI, caustic soda).
- CaOFI quicklime
- CaOFI sodium hydroxide
- CaOFI sodium hydroxide
- CaOFI sodium hydroxide
- CaOFI sodium hydroxide
- calcium carbonate is also precipitated.
- this calcium carbonate is called lime mud.
- the methods of the disclosure can utilize a portion of pulp fiber is taken from pulp operation (not shown in Figure 3) that follows the Cooking & Washing step in Figure 3 and combines it with a portion of green liquor to form a slurry of pulp in green liquor.
- the fiber can be refined.
- the fiber can be taken from a pulp refining operation.
- the fiber can be refined to a level of 20SR to 90SR.
- To this slurry is added an amount of quicklime (CaO) in an amount that is less than the stoichiometric amount needed to completely react with the sodium carbonate dissolved in the green liquor.
- the amount of fiber introduced to the green liquor and the amount of quicklime that is fed into the green liquor-fiber slurry are chosen so that the fibers are completely entrained within the calcium carbonate mineral.
- the quicklime can be added, for example, by a screw-feeder.
- the composite is passed over a screen and washed with water or weak wash from the pulping operation in order to remove any excess green liquor and any calcium carbonate that is not bound to the fiber.
- solid calcium carbonate is separated from the alkaline liquor and sent on to the mud kiln shown in Fig. 3.
- the alkaline liquor portion is sent to part of the process where Green Liquor is formed coming out of the Black Liquor Recovery Boiler. Referring to Figure 4, in this manner, all reactants and products of the process of the disclosure are recovered leading to an operational efficiency that would not otherwise be possible.
- mineralization efficiency refers to the percent of calcium carbonate that is present on or in the fiber of the total calcium carbonate produced in the reaction. Calcium carbonate not present or in the fiber remains loose in the reaction and can be washed away and optionally recycled.
- Figure 10 illustrates the increased mineralization efficiency resulting from using a starting fiber with a specific surface area of 40 m 2 /g verses 4 m 2 /g. The efficiency increased significantly from 3.3% efficiency for the low specific surface area fiber to 95% for the high specific surface area material. Increased mineralization efficiency can allow for reduced amounts of calcium carbonate to be wasted in the processes. Further, high efficiency was found to result in increased amount of calcium carbonate present on or in the fiber, which beneficially increased bending stiffness even as compared to the mineralized low specific surface area fibers.
- Native fibers used in the process of mineralization can have a specific surface area of about 2 m 2 /g to about 80 m 2 /g, about 2 m 2 /g to about 10 m 2 /g, about 15 m 2 /g to about 60 m 2 /g, about 40 m 2 /g to about 80 m 2 /g.
- Other suitable specific surface areas include, for example, about 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42,
- the white liquor that is removed after formation of the fiber-mineral composite and the weak wash that is created when unbound calcium carbonate is washed away from the fiber-mineral composite is substantially the same composition as white liquor and weak wash present in the kraft process normally.
- a mixture of sodium carbonate (Na 2 C0 3 ) and sodium hydroxide (NaOH) was prepared.
- This simulated green liquor typically found in kraft pulp mills with the exception that sodium sulfide (Na 2 S), which is a component of typical kraft green liquors was not used in the lab-scale experiment due to its potential to generate hydrogen sulfide (H 2 S), an extremely poisonous gas.
- the simulated green liquor was prepared by combining 72 g of dry NaOH pellets, 207 g of dry, technical grade, sodium carbonate powder and 1375 g of tap water using a mechanical agitator until a solution was formed.
- Figure 5 illustrates the resulting surface mineralized fibers having the fiber core and calcium carbonate shell.
- a conventional process of precipitated calcium carbonate on a fiber is as follows.
- Figure 6 illustrates the result of the conventional process.
- the calcium carbonate present in the conventional fiber having calcium carbonate precipitated thereon is much more sporadically positioned along the fiber and does not form a shell structure that would affect the bending stiffness as with the fibers of the disclosure.
- the conventional fibers having the precipitated calcium carbonate of this example were made by adding 65 liters of water at a temperature of 21 °C water to a mortar.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US18/007,826 US20230228036A1 (en) | 2020-06-12 | 2021-06-09 | Surface mineralized organic fibers and methods of making the same |
CN202180042240.6A CN115768947A (en) | 2020-06-12 | 2021-06-09 | Surface mineralized organic fibre and its preparing process |
BR112022025014A BR112022025014A2 (en) | 2020-06-12 | 2021-06-09 | MINERALIZED ORGANIC FIBERS ON SURFACE AND MANUFACTURING METHODS THEREOF |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US202063038528P | 2020-06-12 | 2020-06-12 | |
US63/038,528 | 2020-06-12 |
Publications (1)
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WO2021252572A1 true WO2021252572A1 (en) | 2021-12-16 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/US2021/036533 WO2021252572A1 (en) | 2020-06-12 | 2021-06-09 | Surface mineralized organic fibers and methods of making the same |
Country Status (5)
Country | Link |
---|---|
US (1) | US20230228036A1 (en) |
CN (1) | CN115768947A (en) |
BR (1) | BR112022025014A2 (en) |
CL (1) | CL2022003500A1 (en) |
WO (1) | WO2021252572A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2023192172A1 (en) | 2022-03-31 | 2023-10-05 | Specialty Minerals (Michigan) Inc. | Composite fibers and methods of making the same |
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WO1991001409A1 (en) * | 1989-07-24 | 1991-02-07 | The Board Of Regents Of The University Of Washington | Cell wall loading of never-dried pulp fibers |
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WO1998035095A1 (en) | 1997-02-11 | 1998-08-13 | Minerals Technologies Inc. | Lumen loading of mineral filler into cellulose fibers for papermaking |
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-
2021
- 2021-06-09 CN CN202180042240.6A patent/CN115768947A/en active Pending
- 2021-06-09 US US18/007,826 patent/US20230228036A1/en active Pending
- 2021-06-09 BR BR112022025014A patent/BR112022025014A2/en unknown
- 2021-06-09 WO PCT/US2021/036533 patent/WO2021252572A1/en active Application Filing
-
2022
- 2022-12-09 CL CL2022003500A patent/CL2022003500A1/en unknown
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US4300981A (en) | 1979-11-13 | 1981-11-17 | The Procter & Gamble Company | Layered paper having a soft and smooth velutinous surface, and method of making such paper |
WO1991001409A1 (en) * | 1989-07-24 | 1991-02-07 | The Board Of Regents Of The University Of Washington | Cell wall loading of never-dried pulp fibers |
WO1997001670A1 (en) | 1995-06-29 | 1997-01-16 | Metsä-Serla Oy | Filler for use in paper manufacture and procedure for producing a filler |
WO1998035095A1 (en) | 1997-02-11 | 1998-08-13 | Minerals Technologies Inc. | Lumen loading of mineral filler into cellulose fibers for papermaking |
WO1999014432A1 (en) | 1997-09-12 | 1999-03-25 | Ciba Specialty Chemicals Water Treatments Limited | Process of making paper |
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WO2003066961A1 (en) * | 2002-02-09 | 2003-08-14 | Tianzhao Ai | A process of recovering alkali from black liquor of papermaking |
US20100212853A1 (en) * | 2009-02-02 | 2010-08-26 | John Klungness | Fiber loading improvements in papermaking |
WO2011042607A1 (en) * | 2009-10-09 | 2011-04-14 | Upm-Kymmene Corporation | A method for precipitating calcium carbonate and xylan, a product prepared by the method, and its use |
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Publication number | Priority date | Publication date | Assignee | Title |
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WO2023192172A1 (en) | 2022-03-31 | 2023-10-05 | Specialty Minerals (Michigan) Inc. | Composite fibers and methods of making the same |
Also Published As
Publication number | Publication date |
---|---|
CN115768947A (en) | 2023-03-07 |
CL2022003500A1 (en) | 2023-07-07 |
US20230228036A1 (en) | 2023-07-20 |
BR112022025014A2 (en) | 2022-12-27 |
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