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WO2007035507A1 - Procede de remise en pate d'un casse de papier resistant a l’etat humide - Google Patents

Procede de remise en pate d'un casse de papier resistant a l’etat humide Download PDF

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Publication number
WO2007035507A1
WO2007035507A1 PCT/US2006/036075 US2006036075W WO2007035507A1 WO 2007035507 A1 WO2007035507 A1 WO 2007035507A1 US 2006036075 W US2006036075 W US 2006036075W WO 2007035507 A1 WO2007035507 A1 WO 2007035507A1
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WO
WIPO (PCT)
Prior art keywords
repulping
wet
cyanuric acid
mixture
active halogen
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.)
Ceased
Application number
PCT/US2006/036075
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English (en)
Inventor
Jennifer Ann Boettcher
Min Chao
Thomas Peter Tufano
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
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 EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Priority to JP2008531367A priority Critical patent/JP2009509056A/ja
Publication of WO2007035507A1 publication Critical patent/WO2007035507A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
    • D21C5/02—Working-up waste paper
    • D21C5/022—Chemicals therefor
    • 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
    • D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
    • D21C5/02—Working-up waste paper
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/64—Paper recycling

Definitions

  • Paper is recycled via a process called repulping, wherein the cellulose fibers that comprised the original sheet are separated. These fibers can be cleaned, treated, redispersed, and prepared into a pulp slurry essentially similar to that used to make the original sheet. The normal papermakmg process is then followed to form a sheet made from recycled fibers.
  • the process of repulping involves mixing, under shear, in water. Chemicals may be added to accelerate the process; and elevated temperatures are often used.
  • Paper is made to provide specific functional properties. Chemicals are often added to impart and/or enhance these properties. Among the more widely used additives are wet-strength resins. These chemicals act to provide strength to wet paper and are used in, among other paper products, paper towel and packaging.
  • Repulping paper containing a wet-strength resin is difficult because the resin (such as a polyamide-epichlorohydrin resin) is added during paper production to enhance the strength of the paper produced so that the paper does not fall apart when used under wet conditions.
  • the wet-strength resin binds the cellulose fibers together, impeding the repulping process of separating the cellulose fibers.
  • paper treated with wet-strength resins will retain at least 15% of the dry strength of the paper when wet. Paper without wet-strength resin generally retains only 2 to 7% of its dry strength when wet.
  • Oxidation facilitates the breakdown of the wet-strength resin to permit separation of the cellulose fibers.
  • Hypochlorite particularly sodium hypochlorite, is typically used by paper mills in the repulping of wet-strength paper to oxidize the wet-strength resin to facilitate fiber separation.
  • Hypochlorite oxidizes the wet- strength resins within a narrow, carefully maintained pH range and within a temperature range of from about 50°C to about 70 0 C.
  • Environmental issues have been raised concerning the use of hypochlorite for repulping. These concerns relate to the formation of chlorinated organic compounds that are adsorbed by the pulp, chloroform emission, and the problem of adding chlorinated hydrocarbons to the effluent stream.
  • non-halogen-containing compounds such as persulfates have been used more recently to oxidize wet-strength resin during the repulping process.
  • Any persulfate salt typically sodium persulfate, Na2S2 ⁇ g, can be used.
  • This material can also be used with alkali metal, alkaline earth metal, or ammonium salts of carbonate, bicarbonate or sesquicarbonate to enhance repulping performance.
  • Mixtures of persulfate and carbonate, bicarbonate or sesquicarbonate can be used which exhibit substantially increased handling safety over persulfate alone.
  • Gelman, et al., in US Patent 5,972,164 describes the repulping of wet-strength broke using a dry mix of a persulfate (e.g., the sodium salt, Na2S2 ⁇ g) and base.
  • compositions comprising a stable anhydrous mixture of an oxidizing agent and an active halogen agent wherein the oxidizing agent is potassium monopersulfate and the active halogen agent is an alkali metal salt of dichloro-s-triazinetrione, halogenated dimethylhydantoin, or mixtures thereof.
  • the oxidizing agent is potassium monopersulfate
  • the active halogen agent is an alkali metal salt of dichloro-s-triazinetrione, halogenated dimethylhydantoin, or mixtures thereof.
  • the present invention comprises a repulping process for use with wet- strength broke comprising a wet-strength resin and cellulosic fiber, said process comprising contacting an aqueous slurry of said broke with a mixture of 1) potassium monopersulfate as an oxidizing agent, and 2) at least one of an active halogen agent, cyanuric acid, or a combination thereof.
  • the invention relates to paper reprocessing, and more particularly to the repulping of wet- strength broke, and to a composition and process for the repulping of wet-strength paper.
  • the process of the present invention comprises contacting an aqueous slurry of wet-strength broke with an aqueous oxidizing composition
  • an aqueous oxidizing composition comprising a mixture of 1) at least one oxidizing agent, which is potassium monopersulfate, and 2) at least one of (A) an active halogen agent selected from the group consisting of anhydrous sodium dichloroisocyanate, dichlorodimethylhydantoin, bromochlorodimethylhydantoin, or mixtures thereof, (B) cyanuric acid, or (C) mixtures of (A) and (B).
  • Such oxidizing compositions are hereinafter termed "monopersulfate mixtures of the invention".
  • potassium monopersulfate A commercial source of potassium monopersulfate is OXONE, available from E. I. du Pont de Nemours and Company, Wilmington, DE.
  • the name "potassium monopersulfate” is commonly used in the trade to refer to the mixed triple salt 2KHSO 5 .KHSO 4 .K 2 SO 4 , a crystalline salt of enhanced solid-state stability.
  • the proportion of potassium monopersulfate is from about 1% to about 99%, preferably about 50% to about 98%, and more preferably from about 80% to about 95%.
  • the remainder of the mixture, to make up to 100% total is cyanuric acid, or at least one chemical selected from the group comprising anhydrous sodium dichloroisocyanate, dichlorodimethylhydantoin, and bromochlorodimethyl hydantoin.
  • the oxidizing agent and active halogen agent or cyanuric acid are present at a weight ratio of oxidizing agent to active halogen agent or cyanuric acid of from about 98:2 to about 50:50.
  • the concentration of the monopersulfate mixtures of the invention in the aqueous slurry of the broke is from 0.5% to about 5% based on the dry weight of the pulp and preferably from about 1% to about 2% based on the dry weight of the pulp.
  • the ratio of cyanuric acid to one or more of the active halogen sources is from 0:100 to 100:0.
  • a monopersulfate mixture of the invention comprising potassium monopersulfate and cyanuric acid without an active halogen agent.
  • the proportion of potassium monopersulfate is as described above, from about 1% to about 99%, preferably about 50% to about 98%, and more preferably from about 80% to about 95%.
  • the remainder of the mixture is cyanuric acid.
  • Such compositions contain no active halogen agent, an environmentally desirable characteristic.
  • the present invention provides a process for the improved repulping of wet-strength broke, comprising the use of the monopersulfate mixtures of the invention.
  • the aqueous repulping process of the present invention is conducted at a temperature of from about 25°C to about 80°C.
  • the process is conducted at a pH of about 7 to about 11 , and preferably about 10 to about 11.
  • the pH is adjusted to this range with a suitable base, such as an alkali metal hydroxide, alkali metal carbonate, alkali metal bicarbonate, alkaline earth metal hydroxide, alkaline earth metal carbonate, or alkaline earth metal bicarbonate.
  • a suitable base such as an alkali metal hydroxide, alkali metal carbonate, alkali metal bicarbonate, alkaline earth metal hydroxide, alkaline earth metal carbonate, or alkaline earth metal bicarbonate.
  • Sodium hydroxide is preferred.
  • carbonates and bicarbonates limits the accessible pH range.
  • Anhydrous and non-hygroscopic bases such as the carbonates and bicarbonates listed above may be premixed with the monopersulfate mixtures of the invention. However, premixing hygroscopic bases, such as the alkali metal hydroxides, is not recommended.
  • the repulping process is conducted in a slurry contained and agitated in a mechanical repulper.
  • the sequence of addition of the paper, the monopersulfate mixtures of the invention, and the base is optional.
  • the components of the monopersulfate mixtures of the invention can be added separately or in a premixed form.
  • the potassium monopersulfate and active halogen/cyanuric acid component may be added separately or in a premixed form.
  • the base used for pH adjustment can be added before, with, or after the addition of the monopersulfate mixtures of the invention. However, a final pH adjustment after the paper and the monopersulfate mixtures of the invention have been added may be needed. Thus, addition of the base last is preferred.
  • the liquid phase in which the repulping occurs is termed the "repulping bath".
  • the process of repulping paper to obtain recycled pulp fibers is carried out by any mechanical action that disperses dry pulp fibers into an aqueous pulp fiber suspension. Conditions for repulping, as well as equipment commercially used, are discussed in "Handbook for Pulp &Paper Technologists, Second Edition" by G. A. Smook, Angus Wilde Publications, 1992, Chapter 13, pp. 194-195 and 211- 212.
  • the repulping process and its control are known to those skilled in the art.
  • Other additives known to those skilled in the art may be added before, with, or after the addition of the repulping aids used in the present invention. Examples of other additives include but are not limited to ink particle collectors and removers, defoamers, biocides, complexing agents, fixation and conditioning agents, and surfactants.
  • the process of the present invention provides a method for the complete repulping of wet-strength broke containing resins.
  • the process of the present invention provides a method for repulping wet-strength broke that requires much lower active halogen levels, or, in the case of mixtures of potassium monopersulfate and cyanuric acid, eliminates halogen use entirely. As noted > above, reaction products from the use of higher levels of active halogen are environmentally undesirable.
  • the Voith Index provides a visual method for measuring the extent of repulping versus time, thus expressing the Voith Index as a function of repulping time provides an excellent measure of the repulping process.
  • the Voith Index has values of from 1 (corresponding to about 41% of the paper not repulped) to 9 (corresponding to about 0.05% of the paper not repulped). At equivalent active chlorine levels, anhydrous sodium dichloroisocyanate is the fastest chlorine-containing oxidant, with sodium hypochlorite slightly slower.
  • Potassium monopersulfate alone which is chlorine free, enables wet-strength broke repulping, but the repulping rate is significantly slower.
  • the repulping speed of potassium monopersulfate/active halogen and potassium monopersulfate/cyanuric acid blends shows an unexpected and non- linear relationship between blend composition and process rate.
  • the potassium monopersulfate concentration in a potassium monopersulfate/active halogen agent blend is raised from zero to about 80%, the process rate is only slightly slower than for the active halogen agent alone, and is as fast as sodium hypochlorite alone. Above 80% potassium monopersulfate, the rate slows, but even at 95%, the repulping rate is only marginally slower.
  • the percent of potassium monopersulfate content in a potassium monopersulfate/active chlorine agent blend is a direct measure of the reduction in active chlorine.
  • the potassium monopersulfate/active halogen agent blends provide an effective means for the reduction of active chlorine without an adverse impact on the repulping rate.
  • Substituting blends of potassium monopersulfate/sodium hypochlorite to replace potassium monopersulfate/active halogen agent does not provide a similar nonlinear effect of relative concentration on repulping rate.
  • blends of potassium monopersulfate/ anhydrous sodium dichloroisocyanate are stable together, and thus can be premixed and stored under dry conditions, permitting pre-blending and prepackaging.
  • Sodium persulfate is known to be a slower repulping agent for wet strength paper compared with OXONE. Comparative Examples A (OXONE) and I (sodium persulfate) in Tables 1 and 2 demonstrate this difference. In contrast to the monopersulfate mixtures of the invention, blends of sodium persulfate with anhydrous sodium dichloroisocyanate do not show the synergistic effects obtained with blends of OXONE and sodium dichloroisocyanate.
  • the process of the present invention is useful for repulping wet-strength broke containing resins at lower or no levels of halogen without significantly reducing the repulping rate. This provides the environmental advantage of reducing halogen emissions.
  • Potassium monopersulfate as the stable mixed triple salt 2KHSO 5 .KHSO 4 .K 2 SO 4 and is available from E. I. du Pont de Nemours and Company, Wilmington DE, under the tradename OXONE.
  • Anhydrous sodium dichloro-s-triazinetrione (ASDC) is available from
  • Cyanuric Acid CYA
  • 3-bromo-l-chloro-5,5-dimethylhydantoin BCDMH
  • DCDMH 3-Dichloro-5,5-dimethylhydantoin
  • SPS Sodium persulfate
  • a 4-gallon FORMAX MAELSTROM laboratory scale repulper (from Adirondack Machine Corp., Queensbury, NY) was equipped with a 1 A hp (186 W) Dayton motor (from Dayton Electric Mfg. Co., Niles, IL).
  • To the repulper was added BOUNTY paper towels (Proctor & Gamble, Cincinnati OH, 220 g, precut into 2" x 2" pieces) and 3.7 L of deionized water at 60 0 C. With the agitator on, the pH was adjusted to pH 10.5 with a 10% NaOH solution.
  • the preweighed repulper chemicals (the monopersulfate mixtures of the invention) were added to the repulper in an amount equal to 2%, or as otherwise specified in Table I 5 of the dry paper weight loading.
  • Example 2 Various blends of OXONE monopersulfate compound and anhydrous sodium dichloro-s-triazinetrione (Examples 2 - 5) were prepared, used in the repulping process and evaluated as described in Example 1 with the component, grams added and weight percents as listed in Table 1.
  • Controls of OXONE monopersulfate compound, 100 wt. % (Comparative Example A); anhydrous sodium dichloroisocyanate, 100 wt. % (Comparative Example B); and sodium persulfate, 100 wt. % (Comparative Example I) were processed and evaluated in the same manner.
  • Comparative Example C contained no repulping aid.
  • Comparative Example D contained sodium hypochlorite containing the active halogen equivalent of Comparative Example B.
  • Comparative Example E contained a combination of OXONE (80wt. %) and sodium hypochlorite containing the active halogen equivalent of Example 1.
  • the sodium hypochlorite source contained 5.81% active halogen, while the sodium dichloro-s-triazinetrione source contained 60.63% active halogen.
  • Comparative Example I sodium persulfate (4.4 g) replaced, on an equal weight basis, the OXONE (4.4 g) in Comparative Example A.
  • Example 1 The data in Table 1 showed that the repulping performance of all blends of OXONE monopersulfate compound with anhydrous sodium dichloroisocyanate (Examples 1-5) was improved versus that for OXONE alone (Comparative Example A) and a combination of OXONE and sodium hypochlorite (Comparative Example E) with equivalent active halogen content to that in
  • Example 6 was a blend of 3.52 g OXONE monopersulfate compound and 0.52 g cyanuric acid, containing the same molar equivalent of cyanuric acid to that of anhydrous sodium dichloroisocyanate in Example 1.
  • Example 9 was a mixture of 3 components, 3.52 g OXONE monopersulfate compound, 0.66 g anhydrous sodium dichloroisocyanate and 0.13 g cyanuric acid. The cyanuric acid was applied at the molar equivalent to that of sodium dichloroisocyanurate.
  • Comparative Example F contained the molar equivalent of cyanuric acid (2.59 g) to that of anhydrous sodium dichloroisocyanate as in Comparative Example B. Using the molar equivalent of cyanuric acid to that of anhydrous sodium dichloroisocyanate provides a direct mole-to-mole comparison of the performance of cyanuric acid to anhydrous sodium dichloroisocyanate.
  • Example 6 CYA (0.52 g) replaced, on an equimolar basis, the ASDC (0.88 g) in Example 1.
  • Example 9 CYA (0.13 g) replaced, on an equimolar basis, one-quarter or 0.22 g of the ASDC in Example 1.
  • Example F CYA (2.59 g) has replaced, on an equal molar basis, the ASDC (4.4 g) in Example B. These compositions were used in the repulping process of Example 1 and evaluated periodically as in Example 1 using Test Method 2. The resulting data is in Table 1.
  • Example 6 performed similarly to Example 3, while containing no active halogen component.
  • Example 7 was a blend of 3.52 g OXONE monopersulfate compound (80wt. %) and 0.79 g of dichlorodimethylhydantoin, such blend containing the same molar equivalent of anhydrous sodium dichloroisocyanate in Example 1.
  • Example 8 was a blend of 3.52 g OXONE monopersulfate compound (80wt. %) and 0.97 g of bromochlorodimethylhydantoin, such blend containing the same molar equivalent of anhydrous sodium dichloroisocyanate as in Example 1.
  • DCDMH (0.79 g) replaced, on an equimolar basis, the
  • Example 8 BCDMH (0.97 g) replaced, on an equimolar basis, the ASDC (0.88 g) in Example 1.
  • DCDMH 1, 3-Dichloro-5,5-dimethylhydantoin.
  • BCDMH 3-Bromo-l-chloro-5,5-dimethylhydantoin.
  • SPS Sodium persulfate.
  • Table 1 shows that blends of OXONE/ASDC containing 80% or less by weight of OXONE (Examples 1, 4, 5) provided faster wet-strength repulping than Hypo itself (Comparative Example D) and were comparable with ASDC itself (Comparative Example B). Such OXONE/ASDC blends contributed markedly less active halogen than ASDC or Hypo. Higher ratios of OXONE in OXONE/ASDC blends (Examples 2, 3) had even lower active halogen contribution and still showed wet-strength repulping rates higher than OXONE itself (Comparative Example A). Conversely, a blend of OXONE/Hypo (Comparative Example E) did not show any synergistic effect.
  • Blends of OXONE with DCDMH and BCDMH (Examples 7, 8), and blends of OXONE with ASDC and CYA (Example 9) also enhanced wet-strength repulping rates compared with OXONE alone (Comparative Example A).
  • a blend of OXONE/DCDMH in a 3.52:0.97 weight ratio (Example 7) was as effective as DCDMH alone (Comparative Example G) and had but 27.5% of the active halogen.
  • Table 2 below represents a rearrangement of Table 1 showing the time to reach a Voith Index of 6 (a measure of repulping rate) and the relative active halogen content based on the sodium hypochlorite Comparative Example D.

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  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Toxicology (AREA)
  • Paper (AREA)

Abstract

L’invention concerne un procédé de remise en pâte d'un cassé de papier résistant à l'état humide comprenant une résine résistant à l'état humide et une fibre cellulosique, ledit procédé comprenant la mise en contact d'une pâte aqueuse dudit cassé avec un mélange de 1) monopersulfate de potassium en tant qu’agent oxydant et de 2) au moins un élément parmi un agent halogène actif, de l’acide cyanurique, ou un mélange de ces éléments.
PCT/US2006/036075 2005-09-16 2006-09-15 Procede de remise en pate d'un casse de papier resistant a l’etat humide Ceased WO2007035507A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2008531367A JP2009509056A (ja) 2005-09-16 2006-09-15 湿潤強さを有する損紙を再パルプ化するための方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/228,127 US20070062661A1 (en) 2005-09-16 2005-09-16 Process for repulping wet-strength broke
US11/228,127 2005-09-16

Publications (1)

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WO2007035507A1 true WO2007035507A1 (fr) 2007-03-29

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US (1) US20070062661A1 (fr)
JP (1) JP2009509056A (fr)
KR (1) KR20080056212A (fr)
CN (1) CN101263260A (fr)
TW (1) TW200718826A (fr)
WO (1) WO2007035507A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104878639A (zh) * 2014-02-27 2015-09-02 艺康美国股份有限公司 利用杀菌剂保护回收纤维的方法以及利用回收纤维造纸的方法
US10518607B2 (en) * 2017-08-28 2019-12-31 Ford Global Technologies, Llc Pollution event detection

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5674358A (en) * 1992-09-03 1997-10-07 Hercules Incorporated Repulping wet strength paper and paperboard with persulfate and a carbonate buffer
WO1997038158A1 (fr) * 1996-04-08 1997-10-16 Fmc Corporation Systeme a base de persulfate destine a la desintegration de casses de fabrication dotes d'une resistance a l'etat humide et d'un fort indice kappa
US5830382A (en) * 1993-08-17 1998-11-03 Fmc Corporation Persulfate/metal mixtures for repulping and/or decolorizing paper
US5972164A (en) * 1993-03-12 1999-10-26 Fmc Corporation Persulfate mixtures for repulping wet strength paper
WO2001023665A1 (fr) * 1999-09-28 2001-04-05 Peter Gordon Jobling Procedes et compositions pour la retrituration du papier
WO2004031481A1 (fr) * 2002-10-07 2004-04-15 Alfred Pohlen Additif et procede permettant d'eviter ou d'au moins reduire les depots dans les systemes industriels transportant de l'eau et/ou se trouvant en contact avec de l'eau
US20040226676A1 (en) * 2003-05-13 2004-11-18 Zhiqiang Song Use of water-soluble crosslinked cationic polymers for controlling deposition of pitch and stickies in papermaking

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3936385A (en) * 1973-08-09 1976-02-03 Colgate-Palmolive Company Denture cleanser
US4123376A (en) * 1973-08-24 1978-10-31 Colgate-Palmolive Company Peroxymonosulfate-base bleaching and bleaching detergent compositions
JPS60151458A (ja) * 1984-01-20 1985-08-09 Nippon Piston Ring Co Ltd カムシヤフト
US5888350A (en) * 1993-08-17 1999-03-30 Fmc Corporation Method for repulping and/or decolorizing broke using persulfate/metal mixtures
US5565109B1 (en) * 1994-10-14 1999-11-23 Lonza Ag Hydantoin-enhanced halogen efficacy in pulp and paper applications
US5770011A (en) * 1995-11-17 1998-06-23 International Paper Company Neutral monoperoxysulfate bleaching process
US5904808A (en) * 1996-09-16 1999-05-18 Hercules Incorporated Processes and compositions for repulping wet strength paper and paper products
US6171440B1 (en) * 1997-12-31 2001-01-09 Hercules Incorporated Process for repulping wet strength paper having cationic thermosetting resin
US6727219B2 (en) * 2002-07-01 2004-04-27 E. I. Du Pont De Nemours And Company Single dosage oxidizing treatment

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5674358A (en) * 1992-09-03 1997-10-07 Hercules Incorporated Repulping wet strength paper and paperboard with persulfate and a carbonate buffer
US5972164A (en) * 1993-03-12 1999-10-26 Fmc Corporation Persulfate mixtures for repulping wet strength paper
US5830382A (en) * 1993-08-17 1998-11-03 Fmc Corporation Persulfate/metal mixtures for repulping and/or decolorizing paper
WO1997038158A1 (fr) * 1996-04-08 1997-10-16 Fmc Corporation Systeme a base de persulfate destine a la desintegration de casses de fabrication dotes d'une resistance a l'etat humide et d'un fort indice kappa
WO2001023665A1 (fr) * 1999-09-28 2001-04-05 Peter Gordon Jobling Procedes et compositions pour la retrituration du papier
WO2004031481A1 (fr) * 2002-10-07 2004-04-15 Alfred Pohlen Additif et procede permettant d'eviter ou d'au moins reduire les depots dans les systemes industriels transportant de l'eau et/ou se trouvant en contact avec de l'eau
US20040226676A1 (en) * 2003-05-13 2004-11-18 Zhiqiang Song Use of water-soluble crosslinked cationic polymers for controlling deposition of pitch and stickies in papermaking
WO2004101882A1 (fr) * 2003-05-13 2004-11-25 Ciba Specialty Chemicals Water Treatments Limited Utilisation de polymeres cationiques hydrosolubles reticules pour le controle de depot de poix et de matieres gluantes dans la fabrication du papier

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Publication number Publication date
CN101263260A (zh) 2008-09-10
JP2009509056A (ja) 2009-03-05
KR20080056212A (ko) 2008-06-20
TW200718826A (en) 2007-05-16
US20070062661A1 (en) 2007-03-22

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