WO2000024962A1 - Procede pour la mise en pate de papiers - Google Patents
Procede pour la mise en pate de papiers Download PDFInfo
- Publication number
- WO2000024962A1 WO2000024962A1 PCT/EP1999/008143 EP9908143W WO0024962A1 WO 2000024962 A1 WO2000024962 A1 WO 2000024962A1 EP 9908143 W EP9908143 W EP 9908143W WO 0024962 A1 WO0024962 A1 WO 0024962A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- papers
- peracid
- subsequent treatment
- aqueous suspension
- process according
- Prior art date
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
- D21C3/00—Pulping cellulose-containing materials
- D21C3/006—Pulping cellulose-containing materials with compounds not otherwise provided for
-
- 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
- the subject of the present invention is a process for pulping papers, in particular wet resistant papers, for recycling.
- Patent application WO 95/06157 describes a method for setting. "wet resistant" paper pulp containing at least one "wet resistant” resin.
- the wet resistant paper is pulped in a suspension containing an oxidizing agent first at a first pH to initiate defibrization and then at a second pH higher than the first pH until the conversion of the wet resistant paper into defibrated dough is essentially complete.
- the period during which defibrization is initiated is at least 15 minutes, typically about 30 to 60 minutes.
- the subject of the invention is therefore a method for pulping papers by bringing an aqueous suspension of papers into contact with at least one peracid for a period of less than 15 minutes to obtain a raw pulp followed by a subsequent treatment. to obtain a defibrated dough. It has been found, surprisingly, that the defibrization of papers can be initiated at much shorter durations than those taught in interior art.
- duration is meant the time between the start of the addition of the peracid to the aqueous suspension of papers and the start of the subsequent treatment of the raw pulp obtained.
- the duration is less than 15 minutes. Less than or equal to 10 minutes is fine. Less than or equal to 5 minutes gives good results. It is even possible to apply a duration less than or equal to 2 minutes.
- paper any type of paper before or after consumption. When it comes to paper before consumption, it generally comes from manufacturing rejects which do not meet the quality of paper required. he can rejection after the final stage of papermaking or rejection after an intermediate stage.
- the paper suspension can be obtained according to methods well known to those skilled in the art.
- the method according to the invention advantageously applies to papers containing at least one polymeric resin.
- These polymeric resins are, for example, polyamide-epichlorohydrin copolymers.
- the process according to the invention is preferably applied to the pulping of "wet-resistant" papers. "Wet resistant” papers are used, for example, for posters, cardboard or packaging.
- any well-known peracid which is soluble in water can be used.
- Inorganic peracids can also be used, for example peracids derived from sulfuric acid.
- Solutions of distilled peracetic acid, equilibrium peracetic acid, and peroxomonosulfuric acid are well suited.
- equilibrium peracetic acid is intended to denote a mixture at equilibrium state containing essentially peracetic acid, hydrogen peroxide, acetic acid and water.
- the peracid concentrations to be used in the process according to the invention are typically at least 0.05% by weight relative to the dry paste. Concentrations of at least 0.2% by weight give good results.
- the concentrations are typically at most 1% by weight. Concentrations of at most 0.7% by weight are suitable.
- the consistency of the suspensions used in the process according to the invention is generally at most 25%. Preferably the consistency is at most 20%. The consistency is generally at least 2%. Preferably the consistency is at least 4%.
- the peracid In the process according to the invention it is preferred to bring the peracid into contact with the aqueous suspension of papers at a pH of at most 9. Good results are obtained at a pH of at most 8. It is generally advisable to work at a pH of at least 4.
- the pH can be adjusted to the desired value by known means, for example by adding sodium hydroxide.
- the temperature at which the aqueous suspension of papers is brought into contact with the peracid and / or at which the raw pulp is subjected to the subsequent treatment is generally at least 20 ° C.
- a temperature of at least 40 ° C is fine.
- the temperature is at most 85 ° C.
- the temperature is at most 75 ° C.
- the peracid In the process according to the invention it is preferred to bring the peracid into contact with the aqueous suspension of papers in the presence of a wetting agent.
- wetting agent is intended to denote any surfactant well known per se, which improves the contact of the aqueous phase with the papers. It is possible to use, for example, alkyl or aryl ethoxylates, phosphoric esters, polysiloxanes, alkyl or aryl sulfates or sulfonates or mixtures thereof.
- the subsequent treatment of the raw paste is carried out at a second pH different from the pH of the contact with the peracid to obtain a defibrated paste.
- the second pH is preferably greater than 9.
- the subsequent treatment of the raw paste is advantageously carried out with a base.
- the base is sodium hydroxide.
- a suspension of Kraft-type “wet-strength” papers is prepared in a pulper pulverizer containing polyamide-epichlorohydrin copolymers and having a consistency of 10%. 0.5% of LIDITEX HJ® wetting agent (LANKO INTERNATIONAL) is added. The pH is adjusted to the desired value (pH I) and the peracid or its precursor, for example a peracid salt, is added. After the desired contacting time, NaOH is added to reach the second pH (II). The paste is recovered and the degree of pulping is determined by a method analogous to the method described in patent application WO 95/06157.
- PAA peracetic acid
- KMPS potassium monopersulfate
- the method according to the invention makes it possible to obtain good pulping.
- the duration of contact with the peracid is much shorter than that used in known methods.
Landscapes
- Paper (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002348716A CA2348716A1 (fr) | 1998-10-27 | 1999-10-21 | Procede pour la mise en pate de papiers |
EP99971055A EP1141478A1 (fr) | 1998-10-27 | 1999-10-21 | Procede pour la mise en pate de papiers |
AU13771/00A AU1377100A (en) | 1998-10-27 | 1999-10-21 | Paper repulping method |
NO20012051A NO20012051L (no) | 1998-10-27 | 2001-04-26 | Fremgangsmåte for fornyet massedannelse |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE9800773 | 1998-10-27 | ||
BE9800773A BE1013012A6 (fr) | 1998-10-27 | 1998-10-27 | Procede pour la mise en pate de vieux papiers. |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000024962A1 true WO2000024962A1 (fr) | 2000-05-04 |
Family
ID=3891487
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1999/008143 WO2000024962A1 (fr) | 1998-10-27 | 1999-10-21 | Procede pour la mise en pate de papiers |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1141478A1 (fr) |
AU (1) | AU1377100A (fr) |
BE (1) | BE1013012A6 (fr) |
CA (1) | CA2348716A1 (fr) |
NO (1) | NO20012051L (fr) |
WO (1) | WO2000024962A1 (fr) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0133559A1 (fr) * | 1983-08-08 | 1985-02-27 | INTEROX Société Anonyme | Procédé pour la réqénération des vieux papiers |
EP0585955A1 (fr) * | 1992-09-03 | 1994-03-09 | Hercules Incorporated | Remise en pâte de papier et carton |
WO1994020682A1 (fr) * | 1993-03-12 | 1994-09-15 | Fmc Corporation | Melanges de persulfate destines a la remise en pate de papier resistant a l'etat humide |
-
1998
- 1998-10-27 BE BE9800773A patent/BE1013012A6/fr not_active IP Right Cessation
-
1999
- 1999-10-21 AU AU13771/00A patent/AU1377100A/en not_active Abandoned
- 1999-10-21 CA CA002348716A patent/CA2348716A1/fr not_active Abandoned
- 1999-10-21 EP EP99971055A patent/EP1141478A1/fr not_active Withdrawn
- 1999-10-21 WO PCT/EP1999/008143 patent/WO2000024962A1/fr not_active Application Discontinuation
-
2001
- 2001-04-26 NO NO20012051A patent/NO20012051L/no not_active Application Discontinuation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0133559A1 (fr) * | 1983-08-08 | 1985-02-27 | INTEROX Société Anonyme | Procédé pour la réqénération des vieux papiers |
EP0585955A1 (fr) * | 1992-09-03 | 1994-03-09 | Hercules Incorporated | Remise en pâte de papier et carton |
WO1994020682A1 (fr) * | 1993-03-12 | 1994-09-15 | Fmc Corporation | Melanges de persulfate destines a la remise en pate de papier resistant a l'etat humide |
Also Published As
Publication number | Publication date |
---|---|
CA2348716A1 (fr) | 2000-05-04 |
BE1013012A6 (fr) | 2001-07-03 |
NO20012051L (no) | 2001-06-26 |
NO20012051D0 (no) | 2001-04-26 |
EP1141478A1 (fr) | 2001-10-10 |
AU1377100A (en) | 2000-05-15 |
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