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WO2007016769A1 - Blanchissement synergique de matériaux lignocellulosiques avec de l’hydrosulfite de sodium et des phosphines hydrosolubles ou sels de phosphonium - Google Patents

Blanchissement synergique de matériaux lignocellulosiques avec de l’hydrosulfite de sodium et des phosphines hydrosolubles ou sels de phosphonium Download PDF

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Publication number
WO2007016769A1
WO2007016769A1 PCT/CA2006/001281 CA2006001281W WO2007016769A1 WO 2007016769 A1 WO2007016769 A1 WO 2007016769A1 CA 2006001281 W CA2006001281 W CA 2006001281W WO 2007016769 A1 WO2007016769 A1 WO 2007016769A1
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Prior art keywords
pulp
groups
amino
bleaching
lignocellulosic material
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PCT/CA2006/001281
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English (en)
Inventor
Thomas Q. Hu
Brian R. James
Trevor Williams
John A. Schmidt
Dmitry Moiseev
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Fpinnovations
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Publication of WO2007016769A1 publication Critical patent/WO2007016769A1/fr

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    • 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
    • D21C9/10—Bleaching ; Apparatus therefor
    • 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
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/09—Sulfur-containing 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
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/10—Phosphorus-containing 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
    • 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
    • D21H21/14—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 characterised by function or properties in or on the paper
    • D21H21/32—Bleaching agents

Definitions

  • This invention relates to the bleaching of lignocellulosic materials, in particular, to the synergistic bleaching of lignocellulosic materials.
  • Lignocellulosic materials such as wood are the raw materials used for the production of pulps and papers.
  • lignocellulosic materials are first reduced to pulps of discrete fibres by a mechanical or chemical pulping process.
  • mechanical pulping pulps are produced, with retention of lignin, mainly through the action of mechanical forces in a yield of up to about 98%.
  • SGW stone groundwood
  • chemical pulping pulps are produced in a yield of 45-55% through the dissolution of most of the lignin by the pulping chemicals at an elevated temperature.
  • a chemical pulp is the so-called kraft pulp produced using sodium hydroxide and sodium sulfide as the pulping chemicals.
  • DOCSMTL 2 I 58997M Although most mechanical and chemical pulps and recycled fibers respond well to sodium hydrosulfite bleaching, some do not. For example, it has recently been shown that blue-stained lodgepole pine thermomechanical pulp (TMP) made from mountain- pine beetle infested pine wood responds poorly to sodium hydrosulfite bleaching and that the blue-stained pulp can not be bleached with sodium hydrosulfite to the same brightness level as the unstained pulp [Hu, et al., Proc. 2005 PacWest Conf, Harrison Hot Springs, British Columbia (2005)]. In addition, sodium hydrosulfite bleaching generates the by-product sodium thiosulfate that is corrosive to paper machines [Garner, J. Pulp Paper Sci.
  • water-soluble phosphines and phosphonium compounds such as tris(hydroxymethyl)phosphine (THP), P(CH 2 OH) 3 , and tetrakis(hydroxymethyl)phosphonium sulfate (THPS), [P(CH 2 ⁇ H) 4 ] 2 S ⁇ 4 , have been found to be excellent bleaching and brightness stabilizing agents for mechanical and chemical pulps [Hu, et al., US Patent Application, US2004/0173328A1, September 9, 2004].
  • These new bleaching agents have a bleaching power similar to or higher than that of sodium hydrosulfite, but they can be used over a wider range of pH (4.3-9.4), temperature (20-130 0 C) and consistency (e.g. 1.5-20%).
  • Consistency is the weight percentage of pulp in a pulp and water mixture.
  • THPS has previously been shown to be a non-hazardous biocide for the control of hydrogen sulfide emissions and the reduction of corrosion in paper mills [Haack et al, Proc. 1997 Tappi Engineering & Papermakers Conf, Tappi Press, Atlanta, Georgia,
  • synergistic bleaching of lignocellulosic materials such as wood pulps and papers can be achieved by treating the materials with sodium hydrosulfite and a water-soluble phosphine such as tris(hydroxymethyl)phosphine (THP), P(CH 2 OH) 3 , or a water-soluble phosphonium compound such as tetrakis(hydroxymethyl)phosphonium sulfate (THPS), [P(CH 2 OH) 4 ] 2 SO 4 .
  • a water-soluble phosphine such as tris(hydroxymethyl)phosphine (THP), P(CH 2 OH) 3
  • a water-soluble phosphonium compound such as tetrakis(hydroxymethyl)phosphonium sulfate (THPS), [P(CH 2 OH) 4 ] 2 SO 4 .
  • This invention seeks to provide a method for the synergistic bleaching of lignocellulosic materials to brightness levels higher than what can be achieved using sodium hydrosulfite alone, and/or to brightness levels higher than or similar to those achieved with sodium hydrosulfite but at much lower dosages of sodium hydrosulfite.
  • a method for the synergistic bleaching of a lignocellulosic material comprising treatment of the lignocellulosic material with sodium hydrosulfite, Na 2 S 2 O 4 , and a water-soluble phosphine or phosphonium compound of formula (A):
  • Ri, R 2 and R 3 , or Ri, R 2 , R 3 , R 4 and R 5 groups are collectively selected such that the molecule has an overall solubility of at least 0.001 g/L; Ri, R 2 and R 3 , or Ri, R 2 , R 3 and R 4 are independently selected from hydrogen, optionally substituted linear or branched alkyl groups, or optionally substituted aryl groups, the optional substitution referring to the presence of substituents selected from ether, amino, hydroxy, ester, thioether, amide, carbonyl, carboxyl, and carboxylate moieties; and Yi and Y 2 are independently absent or carboxylate moieties; and
  • X is an inorganic or organic anion
  • n, y, z and m are integers, wherein n is 1 or 2, y is ⁇ 5, ie. 1 to 5; z is 1 or 2 and the value of m is ⁇ 5, ie.
  • Ri, R 2 and R 3 , or R 1 , R 2 , R 3 , R 4 and Y 2 are independently selected from hydrogen, a Lewis acid such as boron trifluoride (BF 3 ), optionally substituted linear or branched alkyl groups, or optionally substituted aryl groups, the optional substitution referring to the presence of substituents selected from ether, amino, hydroxy, ester, thioether, amide, carbonyl, carboxyl, and carboxylate moieties.
  • a lignocullosic material bleached by sodium hydrosulfite, Na 2 S 2 O 4 , and a compound of formula (A) defined herein.
  • synergistic bleaching of lignocellulosic materials such as wood pulps and papers can be achieved by treating the materials with sodium hydrosulfite, Na 2 S 2 O 4 , and a water-soluble phosphine such as tris(hydroxymethyl)phosphine (THP), P(CH 2 OH) 3 , or a phosphonium compound containing at least one phosphorus hydroxyalkyl bond/linkage, for example a phosphorus hydroxymethyl bond/linkage (P-CH 2 OH) such as tetrakis(hydroxymethyl)phosphonium sulfate (THPS), [P(CH 2 OH) 4 ] 2 SO 4 .
  • a water-soluble phosphine such as tris(hydroxymethyl)phosphine (THP), P(CH 2 OH) 3
  • a phosphonium compound containing at least one phosphorus hydroxyalkyl bond/linkage for example a phosphorus hydroxymethyl bond/linkage (P-CH 2 OH
  • synergistic bleaching of lignocellulosic materials such as mechanical wood pulps and papers can be achieved by treatment of the materials with sodium hydrosulfite, Na 2 S 2 O 4 , and a water-soluble phosphine, preferably a water-soluble tertiary phosphine; or a phosphonium compound, preferably a quaternary phosphonium compound.
  • the invention is the use of sodium hydrosulfite and any phosphine or phosphonium compound that contains a P- AIk-OH fragment, such as a P-CH 2 -OH fragment, wherein AIk indicates an alkylene radical which may be optionally substituted or interrupted as described herein.
  • Treatment or treating in the method of the invention particularly contemplates contacting the lignocellulosic material with sodium hydrosulfite, Na 2 S 2 O 4 , and the compound of formula (A) in an aqueous medium or vehicle.
  • the treatment or treating contemplates bleaching the lignocellulosic material with the two agents such that the sodium hydrosulfite and the compound of formula (A) are applied simultaneously or sequentially to the lignocellulosic material and are present together in the aqueous medium during the bleaching.
  • the sodium hydrosulfite and the compound of formula (A) co-act on the lignocellulosic material to effect the bleaching.
  • R' is either hydrogen or an optionally substituted linear or branched alkyl group or optionally substituted aryl group; wherein optional substitution refers to the presence of one or more substituents selected from ether, amino, hydroxy, ester, thioether, amide, carbonyl, carboxyl, and carboxylate moieties;
  • Yi and Y 2 are both absent, at least one of Ri and R 2 is the same as R 3 in the molecule with R 3 being a hydroxymethyl (CH 2 OH) group;
  • a Lewis acid such as boron trifluoride (BF 3 ), an alkyl group (R) or an ether group
  • R' is either hydrogen or an optionally substituted linear or branched alkyl group or optionally substituted aryl group; wherein optional substitution refers to the presence of substituents selected from ether, amino, hydroxy, ester, thioether, amide, carbonyl, carboxyl, and carboxylate moieties;
  • g) Yi is a hydroxymethyl group (CH 2 OH) and t is zero or 1, and at least one of R 3 , R 4 and Y 2 is a hydroxymethyl (CH 2 OH) group.
  • X is suitably selected from chloride, sulfate, hydroxide, hydrosulfite, phosphate, carbonate, bicarbonate, bisulfate, alkoxide, formate, acetate, citrate, oxalate, ascorbate, ethylenediaminetetraacetate or diethylenetriaminepentaacetate .
  • the compounds of formula (A) for use in the invention need to be water-soluble and the variables in formula (A) are selected so that the compounds (A) have an overall water solubility of at least 0.001 g/L.
  • the R 1 , R 2 and R 3 groups being collectively selected such that the molecule has an overall solubility of at least 0.001 g/L.
  • Ri and/or R 2 are/is hydrogen; and R 3 , R 3 and R 1 , or R 3 and R 2 , is/are selected from, optionally substituted linear or branch alkyl groups, or optionally substituted aryl groups; or Ri, R 2 and R 3 are independently selected from, optionally substituted linear or branched alkyl groups, or optionally substituted aryl groups.
  • optional substitution can refer to the presence of substituents selected from ether, amino, hydroxy, ester, thioether, amide, carbonyl, carboxyl, and carboxylate moieties.
  • R' is either hydrogen or an optionally substituted linear or branched alkyl group or optionally substituted aryl group.
  • substitution can refer to the presence of substituents selected from ether, amino, hydroxy, ester, thioether, amide, carbonyl, carboxyl, and carboxylate moieties.
  • at least one of R ] f R 2 and R 3 is a CH 2 OH group.
  • the water-soluble phosphine is the commercially available compound, tris(hydroxymethyl)phosphine (THP), P(CH 2 OH) 3 .
  • the Ri, R 2 , R 3 , Re and R 7 groups being collectively selected such that the molecule has an overall solubility of at least 0.001 g/L.
  • R 2 , R 3 and R 7 are independently selected from hydrogen, optionally substituted linear or branched alkyl groups, or optionally substituted aryl groups. Where optional substitution can refer to the presence of substituents selected from ether, amino, hydroxy, ester, thioether, amide, carbonyl, carboxyl, and carboxylate moieties.
  • the diphosphine compound is of C 2 or C s symmetry.
  • R' is either hydrogen or an optionally substituted linear or branched alkyl group or optionally substituted aryl group. Where optional substitution can refer to the presence of substituents selected from ether, amino, hydroxy, ester, thioether, amide, carbonyl, carboxyl, and carboxylate moieties.
  • At least one of Ri and R ⁇ is the same as R 3 in the molecule. In yet even more preferred embodiments at least one of Ri and R 2 is the same as R 3 in the molecule with R 3 being a hydroxymethyl (CH 2 OH) group. In most preferred embodiments Ri, R 2 , R3 and R 7 are all hydroxymethyl (CH 2 OH) groups.
  • R 3 is a hydroxymethyl group (CH 2 OH); and R 1 , R 2 and R 7 are independently selected from hydrogen, a Lewis acid such as boron trifluoride (BF 3 ), optionally substituted linear or branched alkyl groups, or optionally substituted aryl groups.
  • a Lewis acid such as boron trifluoride (BF 3 )
  • optional substitution can refer to the presence of substituents selected from ether, amino, hydroxy, ester, thioether, amide, carbonyl, carboxyl, and carboxylate moieties.
  • R' is either hydrogen or an optionally substituted linear or branched alkyl group or optionally substituted aryl group. Where optional substitution can refer to the presence of substituents selected from ether, amino, hydroxy, ester, thioether, amide, carbonyl, carboxyl, and carboxylate moieties.
  • the phosphonium compound is the commercially- available tetrakis(hydroxymethyl)phosphonium sulfate (THPS), [P(CH 2 OH) 4 ] 2 SO 4 .
  • R 3 is a hydroxymethyl group (CH 2 OH); and Ri, R 2 , R 4 , R 7 and Rg are independently selected from hydrogen, a Lewis acid such as boron trifluoride (BF 3 ), optionally substituted linear or branched alkyl groups, or optionally substituted aryl groups. Where optional substitution can refer to the presence of substituents selected from ether, amino, hydroxy, ester, thioether, amide, carbonyl, carboxyl, and carboxylate moieties.
  • a Lewis acid such as boron trifluoride (BF 3 )
  • BF 3 boron trifluoride
  • optional substitution can refer to the presence of substituents selected from ether, amino, hydroxy, ester, thioether, amide, carbonyl, carboxyl, and carboxylate moieties.
  • the diphosphonium compound is of C 2 or C s symmetry.
  • R' is either hydrogen or an optionally substituted linear or branched alkyl group or optionally substituted aryl group. Where optional substitution can refer to the presence of substituents selected from ether, amino, hydroxy, ester, thioether, amide, carbonyl, carboxyl, and carboxylate moieties.
  • R 3 is a hydroxymethyl group (CH 2 OH); and at least one
  • R 4 , R 7 and Rg is also a hydroxymethyl (CH 2 OH) group.
  • Especially preferred compounds of formula (A) for use in the invention include; tris(hydroxymethyl)phosphine (THP), P(CH 2 OH) 3 ; tris(hydroxypropyl)phosphine(THPP), P(CH 2 CH 2 CH 2 OH) 3 ; bis[bis(hydroxymethyl)phosphino]ethane, (HOCH 2 ) 2 PCH 2 CH 2 P(CH 2 OH) 2 ; tetrakis(hydroxymethyl)phosphonium sulfate (THPS), [P(CH 2 OH) 4 ] 2 SO 4 .
  • alkyl and alkyl moieties are straight chain or branched and have 1 to 12, preferably 1 to 6 and more preferably 1 to 4 carbon atoms; alkyl moieties represent the alkyl portions of thioether, amide, ether and ester substituents; ii) aryl and aryl moieties and arylene have 6 to 14 carbon atoms and are preferably phenyl or phenylene; aryl moieties represent the aryl portions of thioether, amide, ether and ester substituents;
  • water-soluble means, with reference to the compounds of formula (A), that the compounds have an overall water solubility of at least 0.001 g/L.
  • synergistic bleaching with sodium hydrosulf ⁇ te and a phosphine or phosphonium compound refers to bleaching of the lignocellulosic material to give the material an increase in brightness that is higher than the sum of the increases in brightness from separate bleaching of the material with sodium hydrosulfite and with the said phosphine or phosphonium compound.
  • Treatment of lignocellulosic materials such as wood chips, recycled fibers, pulps and papers with sodium hydrosulf ⁇ te, Na 2 S 2 ⁇ 4 , and the said phosphine or phosphonium compounds of formula (A) can be carried out on chips, recycled fibers, pulps or papers over a consistency of 0.01 to 99% in a pH range of 3.0 - 10.0 and a temperature range of 20 - 170 0 C at various places during the manufacturing and processing of the pulps or papers, such as the impregnation or refining of wood chips in an impregnator or refiner, bleaching of the pulps in a bleach tower or any other vessels, and surface sizing or coating of papers in a size press or coater.
  • sodium hydrosulfite either as a powder or dissolved in a solution
  • the said phosphine or phosphonium compounds of formula (A) can be combined in solution and added to the said lignocellulosic materials with or without storage of the combined solution, or they can be added separately to the said lignocellulosic materials.
  • the said phosphine or phosphonium compounds of formula (A) can also be combined with sodium hydrosulfite during the production or preparation of sodium hydrosulfite, and then added to the said lignocellulosic materials.
  • the said phosphine or phosphonium compounds of formula (A) can be used as an additive in sodium hydrosulf ⁇ te bleach formulation for the synergistic bleaching of the said lignocellulosic materials.
  • the amount of sodium hydrosulf ⁇ te can suitably range from 0.01 to 2.0% by weight based on oven-dried (o.d.) chip/f ⁇ ber/pulp weight, preferably at least 0.05%, more preferably at least 0.1% and most preferably from 0.2 to 1.0%, by weight.
  • the amount of the phosphine or the phosphonium compound can suitably range from 0.001 to 2.0% by weight based on oven-dried (o.d.) chip/fiber/pulp weight, preferably at least 0.01%, more preferably at least 0.02% and most preferably from 0.05 to 1.0%, by weight.
  • the treatment can take place over the course of between 5 minutes and 30 days.
  • the invention contemplates the synergistic bleaching of lignocellulosic materials such as wood pulps and papers, the pulps and papers containing the said bleached pulps.
  • the lignocellulosic mechanical wood pulp may be, for example, spruce SGW pulp or lodgepole pine TMP.
  • the lignocellulosic material may, for example, be an unbleached mechanical wood pulp or a mechanical wood pulp that has been partially or fully bleached with other bleaching chemicals such as alkaline hydrogen peroxide; or a chemical wood pulp such as unbleached kraft pulp or kraft pulp partially or fully delignif ⁇ ed and/or bleached with other delignifying and/or bleaching chemicals such as oxygen and/or chlorine dioxide.
  • other bleaching chemicals such as alkaline hydrogen peroxide
  • a chemical wood pulp such as unbleached kraft pulp or kraft pulp partially or fully delignif ⁇ ed and/or bleached with other delignifying and/or bleaching chemicals such as oxygen and/or chlorine dioxide.
  • the lignocellulosic material may also be a paper sheet containing mechanical wood pulp as the sole pulp component or as one of the pulp components.
  • Paper in the present specification also includes paperboard.
  • the bag is removed and cooled in a cold water-bath to room temperature (-20 0 C).
  • the pulp is diluted with DI H 2 O to 0.5- 1.0% Cs. and filtered with filtrate being recycled once to recover the fines. The same dilution and filtration is then repeated once.
  • the pulp is used to make handsheets (200 g/m 2 ) according to PAPTAC Standard Test Method C.5.
  • the ISO brightness values of the sheets are determined in a Technibrite Micro TB-IC instrument according to PAPTAC Standard Test Method E.1.
  • AU chemicals used for the bleaching of wood pulps are in percent with respect to oven- dried (o.d.) pulp weights. Unless otherwise specified, 0.05-1.0% of a phosphine or phosphonium compound is dissolved in a known amount of DI H 2 O or a pulp mill process water that when combined with a wood pulp (4.0-16 g o.d.) will give a 4.0% Cs. Unless otherwise specified, the pH of the solution is adjusted to 5.0, and in the case of bleaching with sodium hydrosulfite and a phosphine or phosphonium compound, 0.2- 2.0% of sodium hydrosulfite is added. The solution is then added to the pulp in a polyethylene bag.
  • the air in the bag is squeezed out, and the bag is sealed and then immersed in a water-bath at 65°C for 1 h with manual mixing at 15 and 30 minutes.
  • the bag is removed and cooled in a cold water-bath to room temperature (-20 0 C).
  • the pulp is diluted with DI H 2 O to 0.5-1.0% Cs. and filtered with filtrate being recycled once to recover the fines. The same dilution and filtration is then repeated once.
  • the pulp is used to make handsheets (200 g/m 2 ) according to PAPTAC Standard Test Method C.5.
  • the ISO brightness values of the sheets are determined in a Technibrite Micro TB-IC instrument according to PAPTAC Standard Test Method E.I.
  • a spruce SGW pulp from an eastern Canadian mill (ISO brightness 66.2%) was bleached with various amounts of sodium hydrosulfite, Na 2 S 2 O 4 , at 4% Cs. (with the mill process water), pH 5.0 and 65 0 C for 1 h according to the general procedure A disclosed above.
  • the same SGW pulp was also bleached with various amounts of THPS alone, or with various amounts OfNa 2 S 2 O 4 and THPS simultaneously, at 4% Cs. (with the mill process water), pH 5.0 and 65 0 C for 1 h according to the general procedure B disclosed above.
  • Table 1 Bleaching the
  • Such synergistic bleaching also made it possible to obtain an ISO brightness of 70.1% with 0.5% Of Na 2 S 2 O 4 , compared to 1.0% OfNa 2 S 2 O 4 needed to reach an ISO brightness of 69.2% when Na 2 S 2 O 4 was used alone.
  • the same TMP was also bleached with various amounts of THPS alone, or with various amounts OfNa 2 S 2 O 4 and THPS simultaneously, at 4% Cs. (with DI H 2 O), pH 5.0 and 65 0 C for 1 h according to the general procedure B disclosed above.
  • Table 2 Bleaching the TMP with 0.5% Na 2 S 2 O 4 gave an ISO brightness gain of 2.0 points.
  • the same TMP was also bleached with 0.1% THPS alone, or with 0.5% Na 2 S 2 O 4 and 0.1% THPS simultaneously, at 4% Cs. and 65 0 C for 1 h according to the general procedure B disclosed above except that a pH 6.0 acetate buffer was used.
  • CTMP hemlock chemithermomechanical
  • the same TMP pulp was also bleached with 1.0% Na 2 S 2 O 4 and 0.1% THPS simultaneously, at 4% Cs.
  • the same TMP pulp was also bleached with 1.0% Na 2 S 2 O 4 and 0.1% THPS simultaneously, at 4% Cs. and 65 0 C for 1 h according to the general procedure B disclosed above except that a pH 5.0 acetate buffer was used and that in one of the bleaching experiments THPS and Na 2 S 2 O 4 were added separately and sequentially to the pulp.
  • Table 6 THPS and Na 2 S 2 O 4 can be combined and then added to the pulp, or they can be added to the pulp separately to bleach the pulp to a higher ISO brightness than Na 2 S 2 O 4 .
  • the same TMP pulp was also bleached with 0.1% THPS alone, or with 0.95% Na 2 S 2 O 4 and 0.1% THPS simultaneously, at 4.6% Cs.
  • a deinked mixed office waste (MOW) pulp from an Eastern Canadian mill (ISO brightness 72.8%) was bleached with 0.5% sodium hydrosulfite, Na 2 S 2 O 4 , at 10% Cs. (with the mill process water), pH 8.0 (pulp initial pH) and 56 0 C for 1.8 hours according to the general procedure A disclosed above except that the pulp slurry was preheated at 56 0 C for 10 minutes before the addition OfNa 2 S 2 O 4 .
  • the same deinked MOW pulp was also bleached with 0.1% THPS alone, or with 0.5% Na 2 S 2 O 4 and 0.1% THPS simultaneously, at 10% Cs.

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Abstract

La présente invention concerne un procédé de blanchissement synergique de matériaux lignocellulosiques. Le procédé implique le traitement de matériaux lignocellulosiques, en particulier, (a) des pâtes à bois telles que la pâte mécanique ordinaire (PMO) et la pâte thermomécanique (PTM), et (b) des papiers fabriqués à partir de pâtes à bois, avec de l’hydrosulfite de sodium et une phosphine hydrosoluble telle que la tris(hydroxyméthyl)phosphine (THP), P(CH2OH)3, ou un composé à base de phosphonium hydrosoluble tel que le sulfate de tétrakis(hydroxyméthyl)phosphonium (STHP), [P(CH2OH)4]2SO4. Lorsqu’il est appliqué à des pâtes à bois telles que la pâte PMO, le procédé permet d’obtenir un blanchissement des pâtes jusqu’à des degrés de blancheur plus élevés que ceux pouvant être obtenus en utilisant l’hydrosulfite de sodium ou ladite phosphine ou ledit composé à base de phosphonium seul, ou le blanchissement des pâtes jusqu’à des degrés de blancheur analogues ou plus élevés que ceux obtenus avec l’hydrosulfite de sodium seul mais avec de bien plus petites doses d’hydrosulfite de sodium.
PCT/CA2006/001281 2005-08-05 2006-08-02 Blanchissement synergique de matériaux lignocellulosiques avec de l’hydrosulfite de sodium et des phosphines hydrosolubles ou sels de phosphonium WO2007016769A1 (fr)

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WO2012141938A1 (fr) * 2011-04-11 2012-10-18 University Of Massachusetts Medical School Mailles fibreuses de cellulose modifiées chimiquement pour une utilisation en tant qu'échafaudages d'ingénierie tissulaire

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CA2514798A1 (fr) * 2003-02-05 2004-08-19 Pulp And Paper Research Institute Of Canada Procede de blanchiment et de stabilisation du brillant de materiaux lignocellulosiques a l'aide de phosphines hydrosolubles ou de composes de phosphonium
CA2496289A1 (fr) * 2004-02-06 2005-08-06 Aurora Specialty Chemistries Corp. Agent d'azurage optique pour pate aqueuse a haut rendement et methode pour fabriquer du papier blanchi

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Title
HU ET AL.: "A New Class of Bleaching and Brightness Stabilizing Agents. Part I: Bleaching of Mechanical Pulps", JOURNAL OF PULP AND PAPER SCIENCE, vol. 30, no. 8, August 2004 (2004-08-01), pages 233 - 240, XP008076478 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012141938A1 (fr) * 2011-04-11 2012-10-18 University Of Massachusetts Medical School Mailles fibreuses de cellulose modifiées chimiquement pour une utilisation en tant qu'échafaudages d'ingénierie tissulaire

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