EP0927277A1 - Composition liquide de desencrage et son utilisation pour le desencrage du papier - Google Patents
Composition liquide de desencrage et son utilisation pour le desencrage du papierInfo
- Publication number
- EP0927277A1 EP0927277A1 EP97919116A EP97919116A EP0927277A1 EP 0927277 A1 EP0927277 A1 EP 0927277A1 EP 97919116 A EP97919116 A EP 97919116A EP 97919116 A EP97919116 A EP 97919116A EP 0927277 A1 EP0927277 A1 EP 0927277A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- surfactant
- deinking
- weight
- liquid
- composition according
- 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
Links
- 239000000203 mixture Substances 0.000 title claims abstract description 59
- 239000007788 liquid Substances 0.000 title claims abstract description 26
- 239000004094 surface-active agent Substances 0.000 claims abstract description 35
- 150000002191 fatty alcohols Chemical class 0.000 claims abstract description 18
- 239000002736 nonionic surfactant Substances 0.000 claims abstract description 15
- 239000002761 deinking Substances 0.000 claims description 35
- 238000005188 flotation Methods 0.000 claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 19
- 238000004537 pulping Methods 0.000 claims description 18
- 125000004432 carbon atom Chemical group C* 0.000 claims description 13
- 125000006353 oxyethylene group Chemical group 0.000 claims description 11
- 125000000217 alkyl group Chemical group 0.000 claims description 5
- -1 aliphatic fatty alcohol Chemical class 0.000 claims description 4
- 125000001931 aliphatic group Polymers 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 239000000243 solution Substances 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 1
- 125000004429 atom Chemical group 0.000 claims 1
- 229910052799 carbon Inorganic materials 0.000 claims 1
- 238000002360 preparation method Methods 0.000 description 11
- 239000002245 particle Substances 0.000 description 9
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 7
- 239000010899 old newspaper Substances 0.000 description 7
- 238000005406 washing Methods 0.000 description 7
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 6
- 239000004115 Sodium Silicate Substances 0.000 description 6
- 238000000926 separation method Methods 0.000 description 6
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 6
- 229910052911 sodium silicate Inorganic materials 0.000 description 6
- 239000000725 suspension Substances 0.000 description 6
- 239000000945 filler Substances 0.000 description 5
- 239000011734 sodium Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000006260 foam Substances 0.000 description 4
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical group CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- 235000013162 Cocos nucifera Nutrition 0.000 description 1
- 244000060011 Cocos nucifera Species 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 239000007844 bleaching agent Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- IPCSVZSSVZVIGE-UHFFFAOYSA-N palmitic acid group Chemical group C(CCCCCCCCCCCCCCC)(=O)O IPCSVZSSVZVIGE-UHFFFAOYSA-N 0.000 description 1
- 239000010893 paper waste Substances 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000003760 tallow Substances 0.000 description 1
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
- D21C5/025—De-inking
- D21C5/027—Chemicals therefor
-
- 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 present invention relates to a liquid paper deinking composition, used in the regeneration of pulp from old printed papers from newspapers, magazines, photocopies and computer papers, and its preparation process and its use for deinking paper.
- the subject of the present invention is a liquid deinking composition as well as its use, suitable for deinking paper by flotation and / or washing, making it possible to obtain a regenerated pulp of high quality having a high whiteness index and a content residual in very low ink and ensuring a stable and reliable deinking process.
- the deinking operation is very important because it represents one of the fundamental steps for recycling old paper.
- the conventional and usual methods of deinking old paper to provide basic material for papermaking fall into two categories; the first is a deinking process by flotation and the second is a deinking process by washing.
- deinking processes essentially consist of two phases. The first consists in defibrating the old paper, an operation also called pulping, and the second in removing the ink by flotation or washing.
- the first phase is carried out by bringing old paper into contact, with stirring, with water and a chemical system generally comprising a silicate, a basic agent, a soap or a surfactant and a bleaching agent, introduced separately.
- a chemical system generally comprising a silicate, a basic agent, a soap or a surfactant and a bleaching agent, introduced separately.
- the pulp is diluted and washed in water, then separated from the ink particles dispersed in water by filtration or centrifugation, this step being repeated as much as necessary in order to obtain a pulp whose qualities are suitable for reuse.
- a third alternative is to combine the washing and flotation steps to separate the ink from the pulp.
- the chemical systems used for deinking are generally selected according to the mode of separation of the pulp and the ink particles.
- the chemical system For separation procedures by washing, the chemical system must be almost non-foaming in operational conditions in order to limit any mechanical problem with the devices used.
- the ink particles to be extracted from the pulp must be fine and well dispersed in the presence of the chemical system to increase the efficiency of the separation of said particles and obtain a high quality pulp.
- the chemical system must have greater foaming properties than that of washing processes.
- the ink particles in this case adhere to the foam generated within the flotation cell, which thus allows their separation from the pulp.
- the ink particles must be able to agglomerate in order to form large aggregates, also facilitating and increasing their separation from the pulp and their elimination by air bubbles.
- the Applicant has developed a new liquid paper deinking composition which can be used both in deinking processes by flotation, and in deking processes by flotation and washing.
- the new liquid composition according to the invention provides a high quality regenerated pulp with a high whiteness index and a very low residual ink content, while ensuring high performance and reliability in the industrial process using said composition.
- the new composition developed by the applicant comprises at least a first nonionic surfactant (A) and at least a second nonionic surfactant chosen from (B) and (C).
- the nonionic surfactant (A) is composed of at least one polyoxyethoxylated and polyoxypropoxylated aliphatic fatty alcohol of the following general formula: R 1 -O - [(CH 2 CH 2 O) x • (CH 2 -CH ⁇ CH 3 ) O) y] -H. in which :
- - R- is an alkyl ⁇ radical comprising between 16 and 22 carbon atoms, - the average value of x is between 5 and 30,
- the second nonionic surfactant (B) is composed of at least one polyoxyethoxylated aliphatic fatty alcohol of the following general formula: R2-O- (CH 2 CH 2 O) z -H in which:
- R 2 is a linear alkyl radical comprising between 10 and 16 carbon atoms
- the average value z is chosen such that the weight proportion of oxyethylene units is between 55 and 75% relative to the weight of the surfactant (B). For example, when the radical R 2 contains 14 carbon atoms, z is between 6 and 13.
- the third type of nonionic surfactant (C) is composed of at least one polyoxyethoxylated aliphatic fatty alcohol corresponding to the following general formula:
- R3 is a linear alkyl radical comprising between 10 and 22 carbon atoms
- the average value of w is chosen such that the weight proportion of oxyethylene units is between 35 and 45% relative to the weight of the surfactant (C). In general, the average value of w is between 1 and 10. For example, when the radical R3 contains 13 carbon atoms, w is between 1 and 4. In general, the weight ratio surfactant (B) / surfactant (A) is between 0.02 and 1, and the weight ratio surfactant (B) / surfactant (A) is between 0.02 and 1.
- compositions are either prepared within the operational environment during the implementation of the industrial paper deinking process or, preferably, are prepared in advance.
- compositions are stable over time and do not particularly require the presence of stability additives.
- compositions can be added in the preparation of the compositions or when they are used in the deinking process.
- the nonionic surfactant (A) is a mixture of fatty alcohols, the radical R-
- fatty alcohols suitable as surfactant (A) are coconut fatty alcohol, tallow fatty alcohol, palmitic, myristic, laureic and oleic fatty alcohol.
- Surfactants of type (A) which can be used in connection with the present invention are available from different commercial sources. In particular, the RHODITEK® 1000 and RHODITEK® 1200 products, marketed by Rhône-Poulenc, give good results in agreement with the preparations according to the invention.
- the nonionic surfactant (B) is a mixture of fatty alcohols whose radical R2 is a linear alkyl of 12 to 16 carbon atoms with a weight proportion of oxyethylene units of between 55 and 65% relative to the weight surfactant (B). More particularly, the surfactant (B) contains 6 to 10 oxyethylene units.
- Surfactants of type (B) which can be used in connection with the present invention are available from different commercial sources. In particular, the Symperonic A7 product marketed by ICI gives good results in agreement with the preparations according to the invention.
- the nonionic surfactant (C) is a mixture of fatty alcohols whose radical R 3 is a linear alkyl of 12 to 14 carbon atoms with a proportion by weight of oxyethylene units of between 38 and 42% relative to the weight of surfactant (C). More particularly, the surfactant (C) contains 2 to 4 oxyethylene units.
- Surfactants of type (C) which can be used in connection with the present invention are available from different commercial sources. In particular, the Symperonic A3 product marketed by ICI and the Rhodasurf LA 30 product marketed by Rhône-Poulenc give good results in agreement with the preparations according to the invention.
- the liquid composition according to the invention can be packaged in different forms and allows its use in all types of industrial devices used for deinking inked old paper.
- the liquid composition is prepared in the form of a solution, emulsion or dispersion without any noticeable changes in its performance being noted.
- the liquid composition is in the form of an aqueous solution.
- the amount of water is between 0.05 and 30% by weight.
- the percentage by weight of surfactants present in the liquid composition varies according to the types of surfactants and is generally between 70 and 100 relative to the total weight of the liquid composition.
- the surfactants used in the context of the invention are prepared according to methods known to those skilled in the art.
- the surfactants are prepared by spraying with ethylene oxide or successive sprays of ethylene oxide and of propylene oxide on the basic fatty alcohol; the reaction is carried out at a temperature of the order of 160 ° C. in the presence of basic catalysis.
- liquid compositions according to the invention can be used according to the methods of the prior art.
- the applicant has developed a particularly effective deinking process, comprising at least one flotation step.
- the deinking process using the liquid composition according to the invention consumes little energy and natural resources; furthermore, it has little impact on the environment, while providing high quality regenerated pulp.
- This original process in which the liquid composition according to the invention is used has two phases.
- the first phase is the pulping step where the inked papers are brought into contact with said composition and water in a pulper to transform the pulp papers.
- the second phase includes at least one flotation step where the pulp is diluted in water.
- the pH is either unmodified or advantageously adjusted to basic pH.
- the basic pH is preferably between 8.5 and 9.
- the usual additives not contained in the liquid composition are added, if necessary.
- the composition according to the invention is advantageously used with a surfactant concentration of the order of 0.01% by weight in the medium of the first phase, although higher or lower concentrations are not excluded.
- the content of old inked papers to be treated represents 5 to 20% by weight, and more particularly between 10 and 15% by weight in the medium.
- This contacting operation can be carried out at room temperature, but more particularly it is carried out at a temperature between 30 and 70 ° C. It takes place in any type of known pulping apparatus provided with stirring and defibration means.
- the pulp can be left to stand for 0.5 to 4 hours.
- the pulp is diluted so as to obtain a concentration of the pulp in water of 1 to 3% by weight.
- flotation This is done by injecting air through the bottom of the tank.
- the foam that forms carries the ink particles and separates it from the pulp.
- the foam is drawn out of the tank by overflow or else by suction.
- the pulp free of ink particles can then be used in the preparation of papers.
- Example 1 illustrates the use of a deinking composition according to the prior art.
- the effectiveness of the deinking treatment is carried out by measuring the ISO whiteness of a sheet of paper formed from the pulp resulting from the pulping and flotation treatments. This efficiency translates for the examples according to our invention by an increase in whiteness compared to that obtained with the preparations of the prior art.
- compositions of Examples 1 and 2 have the same amounts of components with the exception of the composition of Example 2 additionally containing the product Symperonic A7.
- the nature of the 50/50 mixture of old newspapers and old magazines is identical for Examples 1 and 2.
- compositions 3, 4 and 5 have the same amounts of components with the exception of the compositions of Examples 4 and 5 additionally containing the product Rhodasurf LA 30.
- the nature of the 50/50 mixture of old newspapers and old magazines is identical for the examples 2, 3 and 5.
- the first step corresponding to pulping is carried out in a 25 liter pulper fitted with a helical turbine and a 15 liter flotation cell (LAMORT equipment).
- the pulping is carried out for 12 minutes with a propeller rotation speed of approximately 1500 rpm.
- the pulp is then left to stand for 30 minutes.
- the second step, corresponding to the flotation, is carried out in a 15-liter flotation cell.
- the pulp previously obtained is diluted with water of controlled hardness as defined above, so as to obtain a solid suspension at 1.2% of solid matter which is brought to the temperature of 45 ° C.
- the flotation step is carried out at natural pH for 6 minutes by air injection.
- the float suspension is then filtered through a form filler.
- the farm is then dried and its ISO whiteness (diffuse reflectance factor in blue), measured according to standard NF Q 03-039, is 59.7.
- the first step corresponding to pulping is carried out in a 25 liter pulper fitted with a helical turbine and a 15 liter flotation cell (LAMORT equipment).
- Rhoditek 1000 3.37 g
- the pulping and flotation are carried out under the same conditions as above.
- the float suspension is then filtered through a form filler.
- the form is then dried and its ISO whiteness (diffuse reflectance factor in blue), measured according to standard NF Q 03-039, is 60.4.
- Example 3 The first step corresponding to pulping is carried out in a 25 liter pulper fitted with a helical turbine and a 15 liter flotation cell (LAMORT equipment).
- Rhoditek 1000 3.37 g
- the pulping and flotation are carried out under the same conditions as above.
- the float suspension is then filtered through a form filler.
- the form is then dried and its ISO whiteness (diffuse reflectance factor in blue), measured according to standard NF Q 03-039, is 51.7.
- the first step corresponding to pulping is carried out in a 25 liter pulper fitted with a helical turbine and a 15 liter flotation cell (LAMORT equipment).
- Rhoditek 1000 3.37 g
- the pulping and flotation are carried out under the same conditions as above.
- the float suspension is then filtered through a form filler.
- the form is then dried and its ISO whiteness (diffuse reflectance factor in blue), measured according to standard NF Q 03-039, is 53.5.
- the first step corresponding to pulping is carried out in a 25 liter pulper fitted with a helical turbine and a 15 liter flotation cell (LAMORT equipment).
- the water has a controlled hardness, ie:
- the pulping and flotation are carried out under the same conditions as above, with the exception of the product Rhodasurf LA 30 which is introduced after the pulping step.
- the float suspension is then filtered through a form filler.
- the form is then dried and its ISO whiteness (diffuse reflectance factor in blue), measured according to standard NF Q 03-039, is 53.6.
Landscapes
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Toxicology (AREA)
- Paper (AREA)
- Paints Or Removers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9611542A FR2753713B1 (fr) | 1996-09-23 | 1996-09-23 | Composition liquide de desencrage et son utilisation pour le desencrage du papier |
| FR9611542 | 1996-09-23 | ||
| PCT/FR1997/001642 WO1998012377A1 (fr) | 1996-09-23 | 1997-09-17 | Composition liquide de desencrage et son utilisation pour le desencrage du papier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0927277A1 true EP0927277A1 (fr) | 1999-07-07 |
Family
ID=9495959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97919116A Ceased EP0927277A1 (fr) | 1996-09-23 | 1997-09-17 | Composition liquide de desencrage et son utilisation pour le desencrage du papier |
Country Status (10)
| Country | Link |
|---|---|
| EP (1) | EP0927277A1 (fr) |
| AU (1) | AU4306297A (fr) |
| CZ (1) | CZ96299A3 (fr) |
| EA (1) | EA001855B1 (fr) |
| FR (1) | FR2753713B1 (fr) |
| HU (1) | HUP9903780A3 (fr) |
| NO (1) | NO991389L (fr) |
| PL (1) | PL332236A1 (fr) |
| SK (1) | SK37599A3 (fr) |
| WO (1) | WO1998012377A1 (fr) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2703180A1 (fr) | 2012-08-27 | 2014-03-05 | Agfa Graphics Nv | Liquides durcissables par rayonnement formant des radicaux libres pour substrats de désencrage |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN120271806A (zh) * | 2025-04-09 | 2025-07-08 | 浙江皇马科技股份有限公司 | 一种混合型脂肪醇聚氧乙烯醚磷酸酯及其制备方法和应用 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6141386A (ja) * | 1984-07-27 | 1986-02-27 | 栗田工業株式会社 | 脱墨剤 |
| US4666558A (en) * | 1985-12-11 | 1987-05-19 | Shell Oil Company | Process for newspaper deinking using low-foaming surfactant deinking agent |
| US5417808A (en) * | 1991-08-30 | 1995-05-23 | Lion Corporation | Deinking composition for flotation and deinking method |
-
1996
- 1996-09-23 FR FR9611542A patent/FR2753713B1/fr not_active Expired - Fee Related
-
1997
- 1997-09-17 HU HU9903780A patent/HUP9903780A3/hu unknown
- 1997-09-17 CZ CZ99962A patent/CZ96299A3/cs unknown
- 1997-09-17 AU AU43062/97A patent/AU4306297A/en not_active Abandoned
- 1997-09-17 WO PCT/FR1997/001642 patent/WO1998012377A1/fr not_active Ceased
- 1997-09-17 EA EA199900321A patent/EA001855B1/ru not_active IP Right Cessation
- 1997-09-17 EP EP97919116A patent/EP0927277A1/fr not_active Ceased
- 1997-09-17 PL PL33223697A patent/PL332236A1/xx unknown
- 1997-09-17 SK SK375-99A patent/SK37599A3/sk unknown
-
1999
- 1999-03-22 NO NO991389A patent/NO991389L/no unknown
Non-Patent Citations (1)
| Title |
|---|
| See references of WO9812377A1 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2703180A1 (fr) | 2012-08-27 | 2014-03-05 | Agfa Graphics Nv | Liquides durcissables par rayonnement formant des radicaux libres pour substrats de désencrage |
| WO2014033028A2 (fr) | 2012-08-27 | 2014-03-06 | Agfa Graphics Nv | Liquides durcissables par rayonnement par voie radicalaire pour le désencrage de substrats |
| US10655027B2 (en) | 2012-08-27 | 2020-05-19 | Agfa Gevaert Nv | Free radical radiation curable liquids for de-inking substrates |
Also Published As
| Publication number | Publication date |
|---|---|
| CZ96299A3 (cs) | 1999-07-14 |
| PL332236A1 (en) | 1999-08-30 |
| FR2753713B1 (fr) | 1999-07-30 |
| NO991389D0 (no) | 1999-03-22 |
| HUP9903780A2 (hu) | 2000-04-28 |
| NO991389L (no) | 1999-05-18 |
| EA001855B1 (ru) | 2001-08-27 |
| WO1998012377A1 (fr) | 1998-03-26 |
| EA199900321A1 (ru) | 1999-10-28 |
| AU4306297A (en) | 1998-04-14 |
| HUP9903780A3 (en) | 2001-11-28 |
| SK37599A3 (en) | 2000-03-13 |
| FR2753713A1 (fr) | 1998-03-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CH619498A5 (fr) | ||
| EP0133559B1 (fr) | Procédé pour la réqénération des vieux papiers | |
| US4666558A (en) | Process for newspaper deinking using low-foaming surfactant deinking agent | |
| EP0040873B2 (fr) | Procédé pour la régénération de vieux papiers | |
| EP0027670B1 (fr) | Procédé pour la régénération des vieux papiers | |
| JPH07504235A (ja) | 古紙のインキ除去法 | |
| CN102753753B (zh) | 从纸中除去油墨的方法 | |
| JPH01298289A (ja) | 印刷故紙の浮遊インク抜法 | |
| WO1998012377A1 (fr) | Composition liquide de desencrage et son utilisation pour le desencrage du papier | |
| US1988363A (en) | Process of recovering fiber from waste paper | |
| FR2613388A1 (fr) | Procede de blanchiment de pates | |
| US2144756A (en) | Process of treating wood pulp to remove pitch | |
| WO1999055786A1 (fr) | Compositions liquides de desencrage a base de composes terpeniques polyalkoxyles et leur utilisation pour le desencrage du papier | |
| CA2984717A1 (fr) | Procede de desencrage de papier de recuperation | |
| US5968313A (en) | Process for deinking pulp fibers using ethoxylated lanolin | |
| JP5215799B2 (ja) | ピッチ除去剤 | |
| EP0313478A1 (fr) | Procédé de blanchiment de pâtes | |
| JP4064734B2 (ja) | 再生パルプの製造方法 | |
| JP2007277768A (ja) | 脱墨方法及び脱墨剤 | |
| CA1311093C (fr) | Procede pour la delignification de matieres cellulosiques | |
| BE1011620A6 (fr) | Procede de blanchiment de dechets de papiers cellulosiques. | |
| BE537468A (fr) | ||
| JPS60155794A (ja) | 古紙の脱インキ剤 | |
| FR2836162A1 (fr) | Procede de traitement de papiers uses par l'ozone |
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: 19990412 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
|
| AX | Request for extension of the european patent |
Free format text: SI PAYMENT 19990412 |
|
| 17Q | First examination report despatched |
Effective date: 19990809 |
|
| APAB | Appeal dossier modified |
Free format text: ORIGINAL CODE: EPIDOS NOAPE |
|
| APAB | Appeal dossier modified |
Free format text: ORIGINAL CODE: EPIDOS NOAPE |
|
| APAD | Appeal reference recorded |
Free format text: ORIGINAL CODE: EPIDOS REFNE |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED |
|
| 18R | Application refused |
Effective date: 20020716 |
|
| APAF | Appeal reference modified |
Free format text: ORIGINAL CODE: EPIDOSCREFNE |