EP2534296A1 - Procédé pour le blanchiment de pâte à papier - Google Patents

Procédé pour le blanchiment de pâte à papier

Info

Publication number
EP2534296A1
EP2534296A1 EP11703872A EP11703872A EP2534296A1 EP 2534296 A1 EP2534296 A1 EP 2534296A1 EP 11703872 A EP11703872 A EP 11703872A EP 11703872 A EP11703872 A EP 11703872A EP 2534296 A1 EP2534296 A1 EP 2534296A1
Authority
EP
European Patent Office
Prior art keywords
acid
bleaching
linear
cyclic
branched
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP11703872A
Other languages
German (de)
English (en)
Inventor
Thierry Jules Guilmin
Patrick NOTTÉ
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dequest AG
Original Assignee
Dequest AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dequest AG filed Critical Dequest AG
Priority to EP11703872A priority Critical patent/EP2534296A1/fr
Publication of EP2534296A1 publication Critical patent/EP2534296A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • D21C9/1026—Other features in bleaching processes
    • D21C9/1036—Use of compounds accelerating or improving the efficiency of the processes
    • 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
    • D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds
    • D21C9/14—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites
    • 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
    • D21C9/147—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications
    • 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
    • D21C9/16—Bleaching ; Apparatus therefor with per compounds
    • D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides

Definitions

  • This invention pertains to a method of pulp bleaching wherein pulp is bleached in an aqueous medium by means of an oxidative or reducing bleaching agent in the presence of an amino acid alkyl phosphonic acid or a neutralized version thereof.
  • the pulp is treated with an additive level of the bleaching agent in the presence of an additive level of a narrowly defined amino acid alkyl phosphonic acid at a temperature in the range from about 30 to 100°C for a period of 1 minute to 8 hours.
  • the method was found to yield particularly beneficial results in the event the bleaching agent is an oxidative bleach whereby the treatment is applied at a pH in the range of from 8-13.
  • Pulp bleaching technology broadly has been around for a long time and has found considerable commercial application. Alkyl phosphonic acids have been used in the very domain with mitigated success. Actually, the most preferred phosphonic acid compounds for use in pulp bleaching technology is said to be diethylene triamino penta (methylene phosphonic acid) (DTPMP) . There was a considerable and standing desire to develop improved bleaching approaches.
  • DTPMP diethylene triamino penta
  • US 2008/0115692 pertains to a method and compositions for improving properties of pulp produced in alkaline chemical pulping processes wherein at least one conventional phosphonate is used.
  • Chinese patent application CN 2008- 10106832 relates to a method for preparing stabilizer composition for hydrogen peroxide used in paper pulp bleaching.
  • the alkaline stabilizer composition containing EDTA, polyacrylic acid, nitrilotriacetic acid, hydroxyethylidene diphosphonic acid and sodium hydroxide can serve to reduce the decomposition of hydrogen peroxide to below 20%.
  • the use of solutions of poly ( -hydroxyacrylic acid) salt and diethylene triamine penta-acetate having a pH of 3-8 as stabilizers in the hydrogen peroxide bleaching of fibre and paper pulp products is described in JP 1993-182234.
  • WO 2009/092738 and EP 2 082 991 pertain to the use of aqueous medium under substantial exclusion of metal ion interference.
  • a selected phosphonic acid is used for the effective immobilization of metal ions.
  • WO 99/46441 concerns a method for bleaching paper pulp with the aid of per oxidized oxidants consisting, inter alia, by pretreating the paper pulp under alkaline conditions by means of an aspartic acid chelating agent.
  • US 5,759,440 describes a method for stabilizing an aqueous hydrogen peroxide solution by means of a pyrophosphate salt and an aminopolycarboxylic acid. The stabilized solution can be used for pulp bleaching.
  • WO 2008/086937 discloses a process for pulp bleaching comprising adding an amino phosphonate in combination with an oxidative bleaching agent.
  • WO 00/68396 discloses a pulp bleaching agent, where the active ingredient is a XA protein type xylanase.
  • US 4,372,811 disclose a process for pulp bleaching, where one or more aromatic diamines are added to inhibit degradation of carbohydrates in the pulp.
  • the term “percent” or “%” as used throughout this application stands, unless defined differently, for “percent by weight” or “% by weight”.
  • the terms “phosphonic acid” and “phosphonate” are also used interchangeably depending, of course, upon medium prevailing alkalinity/acidity conditions.
  • the term “ppm” stands for “parts per million”.
  • the terms “phosphonic acid” and “phosphonate” are used interchangeably depending upon medium prevailing alkalinity/acidity conditions.
  • the terms “pulp” and “pulp consistency” are used interchangeably. Unless defined differently, pH values are measured at 25 °C on the reaction medium as such.
  • amino acid stands for amino acids in their D, L and DL forms as well as mixtures of the D and L forms.
  • aromatic hydrocarbon radical or moiety preferably includes aryl and heteroaryl groups.
  • inventive method herein concerns pulp bleaching comprising the steps of:
  • a bleaching agent selected from oxidative bleaches and reducing bleaches, in an amount from 0.5% to 10% by weight, expressed on the basis of the dry pulp (100%), and bleaching additives selected from pH regulants and buffer components to conduct the oxidative bleaching treatment at a pH of from 8 to 13 and the reductive bleaching treatment at a pH of from 2 to 6.5;
  • a 2 - (B) y wherein A 1 and A 2 have the formula:
  • a 1 HOOC-A-NH 2 ;
  • a 2 HOOC-C (NH 2 ) (R) (R ) wherein B is an alkylphosphonic acid moiety having from 1 to 6 carbon atoms in the alkyl group and y is an integer of from 1 to 10;
  • A is independently selected from C2-C20 linear, branched, cyclic and aromatic hydrocarbon radicals, optionally substituted by one or more C 1 -C 1 2 linear, branched, cyclic and/or aromatic hydrocarbon groups, which radicals and/or which groups are optionally substituted by one or more OH, COOH and/or NH 2 moieties;
  • R and R ' are independently selected from C 1 -C 20 linear, branched, cyclic and aromatic hydrocarbon radicals, optionally substituted by one or more C1-C12 linear, branched, cyclic and/or aromatic groups, NH 2 and/or COOH, and one of R or R' can be hydrogen; whereby the neutralizing agent to obtain the salt is preferably selected from ammonia, alkali hydro
  • X is selected from C1-C2 00000 linear, branched, cyclic or aromatic hydrocarbon radicals, optionally substituted by one or more C 1 -C 12 linear, branched, cyclic or aromatic groups which radicals and/or which groups are optionally substituted by OH, COOH, COOG, F, Br, CI, I, OG, S0 3 H, S0 3 G and/or SG moieties; H; [V-N(H)] X -H ; [V-N(Y)] n -V; [V-0] x -V; wherein V is selected from: C 2 -50 linear, branched, cyclic or aromatic hydrocarbon radicals, optionally substituted by one or more Ci- 12 linear, branched, cyclic or aromatic groups, which radicals and/or groups are optionally substituted by OH, COOH, COOR' ' , F/Br/Cl
  • A is L-lysine, at least one L-lysine amino radical carries 2 (two) alkyl phosphonic acid moieties; and when
  • a 2 is L-glutamic acid
  • glutamic acid phosphonate represents a combination of from 50-90% by weight pyrrolidone carboxylic acid N-methylene phosphonic acid and from 10-50% by weight of L-glutamic acid diphosphonic acid, expressed on the basis of the reaction products; said amino acid alkyl phosphonic acid compound being added in a level of from 0.01% to 6% by weight, expressed on the level of the dry pulp (100%); said bleaching treatment being conducted at a temperature from 30°C to 100°C for a period of from 1 minutes to 8 hours.
  • a first essential amino acid alkyl phosphonic acid for use in the method of this invention can be represented by the formula : A 1 -(B) Y wherein A 1 has the formula
  • A is independently selected from C2-C2 0 linear, branched, cyclic and aromatic hydrocarbon radicals, optionally substituted by one or more C 1 -C 1 2 linear, branched, cyclic and/or aromatic hydrocarbon groups, which radicals and/or which groups are optionally substituted by one or more OH, COOH and/or N3 ⁇ 4 moieties.
  • A is represented by a C2-C1 linear hydrocarbon chain, optionally, and preferably, substituted by 1 to 3 N3 ⁇ 4 moieties.
  • the selection of any number of carbon atoms in the hydrocarbon chain can constitute a desirable execution depending upon the choice of additional optional groups and/or optional moieties.
  • the actual determination of preferred combinations is a routine measure, well known in the domain of the technology.
  • a second essential amino acid alkyl phosphonic acid for use in the method of this invention can be represented by the formula :
  • R and R ' are independently selected from C1-C20 linear, branched, cyclic and aromatic hydrocarbon radicals, optionally substituted by one or more C 1 -C 1 2 linear, branched, cyclic and/or aromatic hydrocarbon groups, which radicals and/or groups are optionally substituted by one or more OH, N3 ⁇ 4 and/or COOH moieties, and one of R or R' can be hydrogen.
  • the amino acid in the phosphonate inhibitor A 2 can be represented by D,L- alanine wherein y is 2, L-alanine wherein y is 2, L-lysine wherein y is in the range of from 2 to 4, L-phenylalanine wherein y is 2, L-arginine wherein y is in the range of from 2-6, L-threonine wherein y is 2, L-methionine wherein y is 2, L-cysteine wherein y is 2 and L-glutamic acid wherein y is 1 to 2.
  • the L-glutamic acid alkylene phosphonic acid compound as such is, because of insufficient performance and stability, not suitable for use in the method of this invention.
  • the L-glutamic acid alkylene phosphonic acid resulting from the methylenephosphonation of L-glutamic acid can be represented by a substantially binary mixture containing, based on the mixture (100%), a majority of a mono-methylene phosphonic acid derived from a carboxylic acid substituted pyrrolidone and a relatively smaller level of a dimethylene phosphonic acid glutamic acid compound.
  • the reaction product frequently contains from 50 % to 90 % of the pyrrolidone carboxylic acid N-methylene phosphonic acid scale inhibitor and from 10 % to 50 % of the L-glutamic acid bis (alkylene phosphonic acid) compound.
  • the binary mixture can also be prepared by admixing the individual, separately prepared, phosphonic acid compounds.
  • the L-lysine carrying one alkylene phosphonic acid group attached to amino radical (s) represents not more than 20 molar % of the sum of the L-lysine carrying one and two alkylene phosphonic acid groups attached to amino radical (s) .
  • the L-lysine alkylene phosphonic acid is represented by a mixture of L- lysine carrying two alkylene phosphonic acid groups attached to (individual) amino radical (s) (lysine di) and L-lysine carrying four alkylene phosphonic acid groups (lysine tetra) whereby the weight ratio of lysine tetra to lysine di is in the range of from 9 : 1 to 1 : 1, even more preferred 7 : 2 to 4 : 2.
  • Preferred aminoacids in the A phosphonate inhibitors include 7-aminoheptanoic acid, wherein x is 2, 6-aminohexanoic acid, wherein x is 2, 5-aminopentanoic acid, wherein x is 2, 4-amino butyric acid, wherein x is 2 and ⁇ -alanine wherein x is 2.
  • Preferred aminoacids in the phosphonate inhibitors A 1 can be prepared beneficially starting from lactams or other conventionally known materials; 7-aminoheptanoic acid can be used instead of 2-azacyclooctanone to make the corresponding diphosphonate .
  • the preferred aminoacid starting materials are illustrated in the examples hereinafter.
  • a mixture of stoichiometric proportions of the starting material aminoacid (1 mole), phosphorous acid (2 moles), aqueous hydrochloric acid (1.2 moles) is heated under stirring to 100 °C, the formaldehyde (2 moles) is then gradually added over a period of 120-140 minutes at a temperature in the range of from 100-120 °C.
  • the reaction mixture is thereafter kept at 105-115 °C for an additional 60-100 minutes. It is understood that the stoichiometric proportions of the starting materials can be varied to meet the desired degree of phosphonic acid substitution by reaction with the available N-H functions.
  • the amino acid phosphonate for use in the method of this invention can be represented by selected combinations of the amino acid polyphosphonates in combination with a polyphosphonic acid selected from the group of: (a) amino (poly) alkylene polyphosphonic acids wherein the alkylene moiety contains from 1 to 20 carbon atoms; (b) hydroxyalkylene polyphosphonic acids wherein the alkylene moiety contains from 2 to 50 carbon atoms ; and (c) phosphono alkane polycarboxylic acids wherein the alkane moiety is in straight chain configuration containing from 3 to 12 carbon atoms.
  • a polyphosphonic acid selected from the group of: (a) amino (poly) alkylene polyphosphonic acids wherein the alkylene moiety contains from 1 to 20 carbon atoms; (b) hydroxyalkylene polyphosphonic acids wherein the alkylene moiety contains from 2 to 50 carbon atoms ; and (c) phosphono alkane polycarboxylic acids wherein the alkane moiety is in
  • aminoalkylene polyphosphonic acids having from 1 to 12 carbon atoms in the alkylene moiety
  • phosphono alkane polycarboxylic acids have a straight chain alkane configuration having from 4 to 8 carbon atoms and wherein the molar ratio of phosphonic acid radical to carboxylic acid radical is in the range of from 1 : 2 to 1 : 4.
  • Particularly preferred are polyphosphonic acids having from 2 to 8 phosphonic acid groups.
  • the weight ratio of amino acid phosphonate to phosphonic acid is in the range of from 98 : 2 to 25 : 75, preferably from 90 : 10 to 50 : 50.
  • a 2 can be represented by -amino acids including specific natural amino acids such as e.g. occurring in animal species.
  • Amino acids generally are the building blocks of proteins. There are over forty known amino acids about twenty of which are actually contained in e.g. animal tissue. Amino acids can be made by hydrolysis starting from proteins, by enzymatic fermentation and/or by chemical synthesis. This domain of the technology is eminently well known and all the individual technologies are abundantly documented in the literature.
  • Suitable amino acids can be used in their D, D,L, and L forms as well as mixtures of the D and L forms.
  • Preferred a-amino acids for use in the phosphonate inhibitors include: D,L- alanine; L-alanine; L-phenylalanine ; L-lysine; L-arginine; L- methionine; L-cysteine; L-threonine ; and L-glutamic acid. Specific amino acids are excluded as follows:
  • a water insoluble product is obtained; it is believed to be due to the reaction of formaldehyde with tyrosine resulting in the formation of methylene bridges between aromatic moieties; 2. -aminoacids wherein R and/or R ' comprise aromatics wherein at least one carbon atom has been substituted by a heteroatom.
  • the reaction of L-tryptophan (1 eq.) with H 3 PO 3 (2 eq.) and formaldehyde (2.2 eq.) in the presence of HC1 (2.5 moles) between 107 and 111 °C does not lead to the corresponding bis (methylene phosphonic acid) .
  • 31 P NMR analysis only shows signals for the starting phosphorous acid with traces of phosphoric acid.
  • a water insoluble product is obtained; it is believed to be due to the reaction of formaldehyde with tryptophan resulting in the formation of methylene bridges between aromatic moieties; and
  • R is -C(Z) ( R' “ ) ( R" " ) and R , R and R are hydrogen wherein Z is an electron withdrawing group selected from N0 2 , CN, COOH, S0 3 H, OH and halogen.
  • the latter product has been shown by 31 P NMR to decompose under the reaction conditions into fumaric acid and imino bis (methylene phosphonic acid) which is itself converted into ATMP.
  • the amino acid alkylphosphonates for use in the inventive method can be prepared by reacting one or more of the available N-H functions of the amino acid with phosphorous acid and formaldehyde, in the presence of hydrochloric acid, in aqueous medium having a pH of generally less than 4 by heating that reaction mixture, at a temperature of usually greater than 70 °C for a sufficient time to complete the reaction.
  • This kind of reaction is conventional and well-known in the domain of the technology and examples of the novel phosphonate compounds have been synthesized, as described below, via the hydrochloric acid route.
  • the aminoacid phosphonates can be made under substantial exclusion of hydrohalogenic acid and corresponding by-products and intermediates.
  • the aminoacid phosphonates can be manufactured in presence of not more than 0.4 %, preferably less than 2000 ppm, of hydrohalogenic acid, expressed in relation to the phosphorous acid component (100 %) by reacting: (a) phosphorous acid;
  • (b) (d) of from 40 : 1 to 1 : 5; wherein (d) stands for the number of moles of catalyst multiplied by the number of available protons per mole of catalyst.
  • the aminoacid phosphonates formed can be recovered in a manner known per se.
  • the reaction can also be conducted similarly to the homogeneous catalyst parameter selection in the presence of a heterogeneous catalyst selected from e.g.
  • solid acidic metal oxides as such or deposited onto a carrier; cation exchange resins carrying sulfonic or carboxylic Broensted acid groups; acid catalysts derived from the interaction of a solid support having a lone pair of electrons onto which is deposited an organic Broensted catalyst; the interaction of such support onto which is deposited a compound having a Lewis acid site; heterogeneous solids functionalized by chemical Broensted grafting and heterogeneous phosphorus and silicon containing polyacids.
  • Pulp is a dry fibrous material prepared by chemically or mechanically separating fibers from wood, fiber crops or waste paper.
  • processes which can be used to separate wood fibers. These processes are very well known in the domain of the technology.
  • the pulp designation can relate to the process used, e.g. known species are: mechanical pulp; thermomechanical pulp; chemithermomechanical pulp; chemical pulp; and recycled pulp, also known as deinked pulp.
  • the pulp so available can be bleached to produce e.g. a white paper product.
  • One objective of bleaching is to improve the brightness and the cleanliness of the pulp product.
  • the bleaching agent can be selected from oxidative bleaches and reductive bleaches which bleaches are used in a level of from 0.5 to 10%, preferably from 1 to 6%, in particular from 2 to 5%, expressed on the basis of the dry pulp (100%) .
  • bleaching agents suitable for use herein include dithionite, boronhydride, chlorine dioxide, peroxomonosulferic acid (H 2 SO 5 ) , formamidine sulfinic acid, activated acid peroxide e.g. molybdate peroxide; oxygen, peroxide reinforced oxygen, hydrogen peroxide, peracids such as peracetic acid and ozone.
  • the oxidative bleaching agent shall not react with the aminoacid phosphonate. Chlorine and hypochlorite can react with the amino acid phosphonate and can not be used in the oxidative bleaching step herein.
  • the oxidative bleaching treatment is generally conducted at a pH in the range of from 8-13, preferably 8-12, in particular 8.5- 10.5.
  • the reductive bleaching treatment is generally carried out at a pH in the range of from 2-6.5, preferably 3-6.5, in particular 4-6.5.
  • the bleaching step requires, evidently, the presence of suitable pH regulants, buffer components and optionally additives conventional and well known in the domain of the technology.
  • the pH can during the oxidative approach be established with the aid of alkaline materials, in particular alkaline hydroxides including sodium and potassium hydroxide, alkaline earth hydroxides including magnesium and calcium hydroxide, silica buffers and also MgS0 4 .7H 2 0, Epsom salt.
  • alkaline hydroxides including sodium and potassium hydroxide
  • alkaline earth hydroxides including magnesium and calcium hydroxide
  • silica buffers and also MgS0 4 .7H 2 0, Epsom salt.
  • the use of regulant combinations of magnesium hydroxides and magnesium salts was found to be beneficial in that it can deliver better alkalinity reserve, compared to e.g. alkali hydroxide alone, under comparable level conditions.
  • the pH can be adjusted during the oxidative bleaching with the aid of sodium hydroxide whereas sulfuric acid can be used for pH control preparatory to the reductive bleaching step .
  • the pulp is used during the bleaching treatment in a level of from 1 to 40%, preferably from 3 to 30%, in one particular execution from 4 to 25% expressed on the basis of the aqueous medium.
  • These ranges are fairly standard in the relevant technical domain. These ranges can be, and frequently are, slightly different depending upon which bleaching step, oxidative or reductive, is used.
  • the pulp consistency is usually higher for the oxidative bleaching step than for the reducing bleaching step although the respective levels are within the ranges recited herein.
  • the inventive bleaching treatment is conducted for a period of from 1 minute to 8 hours, preferably from 8 minutes to 6 hours, in particular from 20 minutes to 2 hours at a temperature of from 30 to 100°C, preferably from 40 to 90 °C, in particular from 45 to 80°C.
  • the sequence of adding the amino acid alkyl phosphonic acid component and the bleaching agent is not fixed.
  • the amino acid alkyl phosphonic acid component is added first.
  • both components are simultaneously added.
  • the method herein generally has been practiced extensively for a long time.
  • a summary description can serve as a brief reminder of the known state of the art.
  • the bleaching method herein can embody multiple variations whereby the most common approaches embody single or multiple subsequent stages.
  • a one-stage bleaching process comprises adding the pulp and the chelant before the pulp thickener followed by a steam mixer where the bleaching agent, frequently a bleach solution, is added.
  • the bleaching can occur in a bleach tower followed by neutralizing before transferring the bleached pulp to the paper machine.
  • a two-stage bleaching process is arranged whereby an oxidative bleaching step is followed by a reductive bleaching step.
  • the oxidative step can be identical to the one-stage process above up to the neutralizing stage.
  • the reductive bleach is added together with the bleached pulp originating from the first stage, and possibly additional chelant, into a second bleaching tower, e.g. an up flow tower.
  • the bleached pulp is usually kept in a stock chest and can from there be transferred to the paper machine, possibly via a pulp thickener to generate the right pulp consistency.
  • a test is conducted as follows: In a three neck flask equipped with a mechanical stirrer, a constant pressure dropping funnel and a tubing connected to a volumetric measuring devise are placed 0.2 g of the test product; 6g of a 32%w/w magnesium hydroxide aqueous slurry; 3g of sodium silicate and lOg of a 1% iron sulfate hepta hydrate in water. Demineralized water is added up to a total weight of 150g. The mixture is heated to 60°C under stirring before addition of 16.7g of a 42% aqueous hydrogen peroxide solution. Volumes of oxygen gas formed after addition of the hydrogen peroxide are recorded on a time basis. Table 1 gives the experimental results where time is expressed in minutes (min) and oxygen volumes in milliliters (ml) .
  • Oxygen volumes (ml)
  • Oxygen volumes (min) (ml ) for Lysine for Dequest 2066 (ml) for DTPA tetraphph
  • the volume of oxygen gas formed after addition of the hydrogen peroxide is significantly by reduced in the inventive method.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Detergent Compositions (AREA)

Abstract

La présente invention concerne un procédé pour le blanchiment de pâte à papier dans lequel un acide (acide aminé)phosphonique est utilisé conjointement avec un agent de blanchiment, des régulateurs de pH et des tampons de pH pour le traitement de pâte à papier dans un milieu aqueux. L'agent de blanchiment peut être représenté par des agents de blanchiment oxydants et réducteurs. Le traitement de blanchiment oxydant est conduit en milieu alcalin tandis que le traitement réducteur est conduit dans un milieu légèrement acide.
EP11703872A 2010-02-12 2011-02-14 Procédé pour le blanchiment de pâte à papier Withdrawn EP2534296A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11703872A EP2534296A1 (fr) 2010-02-12 2011-02-14 Procédé pour le blanchiment de pâte à papier

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP10153474 2010-02-12
PCT/EP2011/052129 WO2011098599A1 (fr) 2010-02-12 2011-02-14 Procédé pour le blanchiment de pâte à papier
EP11703872A EP2534296A1 (fr) 2010-02-12 2011-02-14 Procédé pour le blanchiment de pâte à papier

Publications (1)

Publication Number Publication Date
EP2534296A1 true EP2534296A1 (fr) 2012-12-19

Family

ID=42111644

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11703872A Withdrawn EP2534296A1 (fr) 2010-02-12 2011-02-14 Procédé pour le blanchiment de pâte à papier

Country Status (7)

Country Link
US (1) US20130042986A1 (fr)
EP (1) EP2534296A1 (fr)
JP (1) JP2013519801A (fr)
BR (1) BR112012020292A2 (fr)
CA (1) CA2789180A1 (fr)
RU (1) RU2012137954A (fr)
WO (1) WO2011098599A1 (fr)

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE434284B (sv) 1980-05-07 1984-07-16 Mo Och Domsjoe Ab Forfarande vid syrgasdelignifiering av kemiskt uppsluten cellulosamassa varvid aromatiska diaminer tillfores
US5759440A (en) 1989-07-20 1998-06-02 Interox (Societe Anonyme) Stabilized aqueuous solution of hydrogen peroxide and process for stabilizing an aqueous solution of hydrogen peroxide
JPH05182234A (ja) 1991-12-28 1993-07-23 Japan Steel Works Ltd:The 光ピックアップ
US5616280A (en) * 1993-08-25 1997-04-01 Burlington Chemical Co., Inc. Bleaching composition
FI115470B (fi) * 1996-02-19 2005-05-13 Kemira Oyj Menetelmä kemiallisen selluloosamateriaalin käsittelemiseksi
BE1011785A3 (fr) 1998-03-10 2000-01-11 Solvay Procede de blanchiment et/ou de delignification de pates a papier chimiques.
CA2373135A1 (fr) 1999-05-12 2000-11-16 Xencor, Inc. Nouvelle xylanase alcalinophile thermostable
EP1886976A1 (fr) * 2006-08-09 2008-02-13 Thermphos Trading GmbH Methode pour l'inhibition de l'entartrage
US20080115692A1 (en) 2006-11-17 2008-05-22 Halliburton Energy Services, Inc. Foamed resin compositions and methods of using foamed resin compositions in subterranean applications
EP1932850A1 (fr) * 2006-12-11 2008-06-18 Thermphos Trading GmbH Composés de phosphonate
US7976582B2 (en) 2007-01-16 2011-07-12 Conopco, Inc. Bleaching of substrates
EP2082991A1 (fr) 2008-01-22 2009-07-29 Thermphos Trading GmbH Procédé de traitement de l'eau

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2011098599A1 *

Also Published As

Publication number Publication date
BR112012020292A2 (pt) 2016-05-03
WO2011098599A1 (fr) 2011-08-18
JP2013519801A (ja) 2013-05-30
CA2789180A1 (fr) 2011-08-18
RU2012137954A (ru) 2014-03-20
US20130042986A1 (en) 2013-02-21

Similar Documents

Publication Publication Date Title
FI88526C (fi) Foerbaettrat foerfarande foer blekning av cellulosamassa medelst vaeteperoxid
FI79825B (fi) Inhiberad vattenhaltig komposition av vaeteperoxid.
US9108866B2 (en) Method of scale inhibition
CN101589191B (zh) 底物的漂白
RU2011138725A (ru) Композиция для ингибирования образования отложений кальциевых солей
RU2494049C2 (ru) Способ обработки воды
US4216163A (en) N-Sulfo alkane amino alkane phosphoric acids and their alkali metal salts, and a process of producing same
US9376650B2 (en) Method of water treatment
FI120201B (fi) Uusi koostumus ja menetelmä kuitumateriaalin käsittelemiseksi
US20130042986A1 (en) Method for pulp bleaching
FI122239B (fi) Menetelmä kuitumateriaalin käsittelemiseksi ja uusi koostumus
EP0369711B1 (fr) Composition de phosphate et son utilisation
EP0740015B1 (fr) L'acide éthylène diamine tri-acétique et les sels obtenus à partir de celui-ci comme agents de chélation dans le blanchiment de pâte
US20120015860A1 (en) Gentle bleaching agent
US20030216275A1 (en) Nª,n -dialkyl aminomethylenephosphonic acids and use thereof
RU2155834C1 (ru) Способ отбелки древесной массы
EP1276744A1 (fr) Acides n-alpha ,n-omega -dialkyle aminomethylenephosphoniques et leur utilisation
WO2010136550A1 (fr) Procédé de blanchiment de pâte à papier mécanique
CA2743838A1 (fr) Composition et processus de blanchiment de la pate mecanique

Legal Events

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

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20120810

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

DAX Request for extension of the european patent (deleted)
17Q First examination report despatched

Effective date: 20131206

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

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20140417