EP1774097A2 - Verwendung von cyclodextrin zur verringerung der vergilbung von pulpe und papier - Google Patents

Verwendung von cyclodextrin zur verringerung der vergilbung von pulpe und papier

Info

Publication number: EP1774097A2
Authority: EP; European Patent Office
Prior art keywords: cyclodextrin; pulp; paper; yellowing; chromophore
Prior art date: 2004-07-07
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 Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.): Withdrawn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

EP05769014A

Other languages

English (en)

French (fr)

Inventor

Greg Delozier

Kim Bloomfield

Jing Luo

Hui Xu

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.)

Novozymes North America Inc

Original Assignee

Novozymes North America Inc

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.)

2004-07-07

Filing date

2005-07-07

Publication date

2007-04-18

2005-07-07 Application filed by Novozymes North America Inc filed Critical Novozymes North America Inc

2007-04-18 Publication of EP1774097A2 publication Critical patent/EP1774097A2/de

Status Withdrawn legal-status Critical Current

Links

229920000858 Cyclodextrin Polymers 0.000 title claims abstract description 43
HFHDHCJBZVLPGP-UHFFFAOYSA-N schardinger α-dextrin Chemical compound O1C(C(C2O)O)C(CO)OC2OC(C(C2O)O)C(CO)OC2OC(C(C2O)O)C(CO)OC2OC(C(O)C2O)C(CO)OC2OC(C(C2O)O)C(CO)OC2OC2C(O)C(O)C1OC2CO HFHDHCJBZVLPGP-UHFFFAOYSA-N 0.000 title claims abstract description 39
238000004383 yellowing Methods 0.000 title claims abstract description 18
238000000034 method Methods 0.000 claims abstract description 25
238000005406 washing Methods 0.000 claims abstract description 19
239000002243 precursor Substances 0.000 claims description 16
235000014113 dietary fatty acids Nutrition 0.000 claims description 14
229930195729 fatty acid Natural products 0.000 claims description 14
239000000194 fatty acid Substances 0.000 claims description 14
150000004665 fatty acids Chemical class 0.000 claims description 14
108090000790 Enzymes Proteins 0.000 claims description 10
102000004190 Enzymes Human genes 0.000 claims description 10
229920001450 Alpha-Cyclodextrin Polymers 0.000 claims description 8
HFHDHCJBZVLPGP-RWMJIURBSA-N alpha-cyclodextrin Chemical compound OC[C@H]([C@H]([C@@H]([C@H]1O)O)O[C@H]2O[C@@H]([C@@H](O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O3)[C@H](O)[C@H]2O)CO)O[C@@H]1O[C@H]1[C@H](O)[C@@H](O)[C@@H]3O[C@@H]1CO HFHDHCJBZVLPGP-RWMJIURBSA-N 0.000 claims description 8
229940043377 alpha-cyclodextrin Drugs 0.000 claims description 8
238000011282 treatment Methods 0.000 claims description 8
238000011065 in-situ storage Methods 0.000 claims description 6
229920005610 lignin Polymers 0.000 claims description 6
230000009467 reduction Effects 0.000 claims description 4
101710121765 Endo-1,4-beta-xylanase Proteins 0.000 claims description 3
239000002253 acid Substances 0.000 claims description 3
150000007513 acids Chemical class 0.000 claims description 3
230000002255 enzymatic effect Effects 0.000 claims description 3
239000011347 resin Chemical class 0.000 claims description 3
229920005989 resin Chemical class 0.000 claims description 3
108010025880 Cyclomaltodextrin glucanotransferase Proteins 0.000 claims 1
230000015572 biosynthetic process Effects 0.000 abstract description 11
238000004519 manufacturing process Methods 0.000 abstract description 5
239000000123 paper Substances 0.000 description 28
238000004537 pulping Methods 0.000 description 14
239000000835 fiber Substances 0.000 description 10
XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
229940088598 enzyme Drugs 0.000 description 9
239000000463 material Substances 0.000 description 9
229910001868 water Inorganic materials 0.000 description 8
230000008569 process Effects 0.000 description 7
239000000243 solution Substances 0.000 description 7
239000002023 wood Substances 0.000 description 7
OYHQOLUKZRVURQ-HZJYTTRNSA-N Linoleic acid Chemical compound CCCCC\C=C/C\C=C/CCCCCCCC(O)=O OYHQOLUKZRVURQ-HZJYTTRNSA-N 0.000 description 6
238000004061 bleaching Methods 0.000 description 6
235000020778 linoleic acid Nutrition 0.000 description 6
OYHQOLUKZRVURQ-IXWMQOLASA-N linoleic acid Natural products CCCCC\C=C/C\C=C\CCCCCCCC(O)=O OYHQOLUKZRVURQ-IXWMQOLASA-N 0.000 description 6
229920002522 Wood fibre Polymers 0.000 description 4
HYBBIBNJHNGZAN-UHFFFAOYSA-N furfural Chemical compound O=CC1=CC=CO1 HYBBIBNJHNGZAN-UHFFFAOYSA-N 0.000 description 4
239000000203 mixture Substances 0.000 description 4
150000003505 terpenes Chemical class 0.000 description 4
239000002025 wood fiber Substances 0.000 description 4
108090001060 Lipase Proteins 0.000 description 3
102000004882 Lipase Human genes 0.000 description 3
239000004367 Lipase Substances 0.000 description 3
235000014633 carbohydrates Nutrition 0.000 description 3
150000001720 carbohydrates Chemical class 0.000 description 3
239000007795 chemical reaction product Substances 0.000 description 3
229940097362 cyclodextrins Drugs 0.000 description 3
230000002209 hydrophobic effect Effects 0.000 description 3
-1 hydroxymethyl furaldehyde Chemical compound 0.000 description 3
239000002655 kraft paper Substances 0.000 description 3
235000019421 lipase Nutrition 0.000 description 3
239000000047 product Substances 0.000 description 3
239000004094 surface-active agent Substances 0.000 description 3
239000002699 waste material Substances 0.000 description 3
102000051366 Glycosyltransferases Human genes 0.000 description 2
108700023372 Glycosyltransferases Proteins 0.000 description 2
MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
229920002472 Starch Polymers 0.000 description 2
UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
238000013019 agitation Methods 0.000 description 2
239000003513 alkali Substances 0.000 description 2
150000001875 compounds Chemical class 0.000 description 2
238000009833 condensation Methods 0.000 description 2
230000005494 condensation Effects 0.000 description 2
239000000356 contaminant Substances 0.000 description 2
239000008367 deionised water Substances 0.000 description 2
229910021641 deionized water Inorganic materials 0.000 description 2
239000000796 flavoring agent Substances 0.000 description 2
235000019634 flavors Nutrition 0.000 description 2
238000005188 flotation Methods 0.000 description 2
238000005259 measurement Methods 0.000 description 2
230000003647 oxidation Effects 0.000 description 2
238000007254 oxidation reaction Methods 0.000 description 2
238000002360 preparation method Methods 0.000 description 2
238000007363 ring formation reaction Methods 0.000 description 2
230000035945 sensitivity Effects 0.000 description 2
238000001228 spectrum Methods 0.000 description 2
235000019698 starch Nutrition 0.000 description 2
239000008107 starch Substances 0.000 description 2
238000003860 storage Methods 0.000 description 2
239000000126 substance Substances 0.000 description 2
239000000725 suspension Substances 0.000 description 2
235000007586 terpenes Nutrition 0.000 description 2
239000010875 treated wood Substances 0.000 description 2
150000003626 triacylglycerols Chemical class 0.000 description 2
239000001993 wax Substances 0.000 description 2
OYHQOLUKZRVURQ-NTGFUMLPSA-N (9Z,12Z)-9,10,12,13-tetratritiooctadeca-9,12-dienoic acid Chemical compound C(CCCCCCC\C(=C(/C\C(=C(/CCCCC)\[3H])\[3H])\[3H])\[3H])(=O)O OYHQOLUKZRVURQ-NTGFUMLPSA-N 0.000 description 1
108010065511 Amylases Proteins 0.000 description 1
102000013142 Amylases Human genes 0.000 description 1
108010059892 Cellulase Proteins 0.000 description 1
239000004262 Ethyl gallate Substances 0.000 description 1
108091005804 Peptidases Proteins 0.000 description 1
102000035195 Peptidases Human genes 0.000 description 1
108010059820 Polygalacturonase Proteins 0.000 description 1
239000004365 Protease Substances 0.000 description 1
239000000853 adhesive Substances 0.000 description 1
230000001070 adhesive effect Effects 0.000 description 1
230000002411 adverse Effects 0.000 description 1
230000032683 aging Effects 0.000 description 1
239000012670 alkaline solution Substances 0.000 description 1
108090000637 alpha-Amylases Proteins 0.000 description 1
235000019418 amylase Nutrition 0.000 description 1
229940025131 amylases Drugs 0.000 description 1
238000013459 approach Methods 0.000 description 1
230000009286 beneficial effect Effects 0.000 description 1
WHGYBXFWUBPSRW-FOUAGVGXSA-N beta-cyclodextrin Chemical compound OC[C@H]([C@H]([C@@H]([C@H]1O)O)O[C@H]2O[C@@H]([C@@H](O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O3)[C@H](O)[C@H]2O)CO)O[C@@H]1O[C@H]1[C@H](O)[C@@H](O)[C@@H]3O[C@@H]1CO WHGYBXFWUBPSRW-FOUAGVGXSA-N 0.000 description 1
229960004853 betadex Drugs 0.000 description 1
230000015556 catabolic process Effects 0.000 description 1
238000006243 chemical reaction Methods 0.000 description 1
238000004140 cleaning Methods 0.000 description 1
238000000576 coating method Methods 0.000 description 1
238000004040 coloring Methods 0.000 description 1
230000009918 complex formation Effects 0.000 description 1
238000013270 controlled release Methods 0.000 description 1
108010005400 cutinase Proteins 0.000 description 1
238000006731 degradation reaction Methods 0.000 description 1
239000006185 dispersion Substances 0.000 description 1
239000003814 drug Substances 0.000 description 1
229940079593 drug Drugs 0.000 description 1
230000000694 effects Effects 0.000 description 1
238000005265 energy consumption Methods 0.000 description 1
150000002148 esters Chemical class 0.000 description 1
108010093305 exopolygalacturonase Proteins 0.000 description 1
GDSRMADSINPKSL-HSEONFRVSA-N gamma-cyclodextrin Chemical compound OC[C@H]([C@H]([C@@H]([C@H]1O)O)O[C@H]2O[C@@H]([C@@H](O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O3)[C@H](O)[C@H]2O)CO)O[C@@H]1O[C@H]1[C@H](O)[C@@H](O)[C@@H]3O[C@@H]1CO GDSRMADSINPKSL-HSEONFRVSA-N 0.000 description 1
229940080345 gamma-cyclodextrin Drugs 0.000 description 1
239000003292 glue Substances 0.000 description 1
238000010438 heat treatment Methods 0.000 description 1
108010002430 hemicellulase Proteins 0.000 description 1
230000002779 inactivation Effects 0.000 description 1
238000011534 incubation Methods 0.000 description 1
230000003993 interaction Effects 0.000 description 1
150000004668 long chain fatty acids Chemical class 0.000 description 1
230000000873 masking effect Effects 0.000 description 1
238000012986 modification Methods 0.000 description 1
230000004048 modification Effects 0.000 description 1
230000003287 optical effect Effects 0.000 description 1
230000000704 physical effect Effects 0.000 description 1
238000001556 precipitation Methods 0.000 description 1
239000013055 pulp slurry Substances 0.000 description 1
238000011084 recovery Methods 0.000 description 1
230000004044 response Effects 0.000 description 1
238000012216 screening Methods 0.000 description 1
238000000926 separation method Methods 0.000 description 1
239000007787 solid Substances 0.000 description 1
238000001179 sorption measurement Methods 0.000 description 1
230000006641 stabilisation Effects 0.000 description 1
238000011105 stabilization Methods 0.000 description 1
229910001220 stainless steel Inorganic materials 0.000 description 1
239000010935 stainless steel Substances 0.000 description 1
238000010561 standard procedure Methods 0.000 description 1
239000004753 textile Substances 0.000 description 1
230000000930 thermomechanical effect Effects 0.000 description 1

Classifications

- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- 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
- D21C9/001—Modification of pulp properties
- D21C9/002—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives
- D21C9/005—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives organic compounds
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/143—Agents preventing ageing of paper, e.g. radiation absorbing substances
- 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
- D21C5/005—Treatment of cellulose-containing material with microorganisms or enzymes
- 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
- D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/005—Microorganisms or enzymes

Definitions

the present invention relates to a method for preventing or reducing yellowing/brightness reversion of paper and pulps.
Paper production involves, as a first step, the formation of pulp from wood.
raw or pre-treated wood chips are "cooked" under high pressure and temperature in the presence of alkali and sulfide to dissolve the polymeric lignaceous material between the individual wood fibers.
the liberated fibers still contain significant amounts of the colored lignaceous material within the fiber wall that can be removed to varying degrees via a spectrum of conventional bleaching operations/chemistries.
the bleached wood fiber may contain various amounts of residual lignin and extractives (e.g. resin acids, fatty acids, triglycerides, terpenes, terpenoids, waxes, etc.).
Paper and pulps prepared from bleached fiber containing trace amounts of residual lignin and/or extractives have been associated with enhanced sensitivity to color/brightness reversion upon exposure to elevated temperatures. Such thermal extremes can be encountered during conventional shipping and storage operations or within the dryer section and at the paper reel winder as the bleached fiber is converted into the final paper end- product.
heat-sensitive precursors of chromophores such as lignin, extractives, as well as oxidation, condensation and cyclization products of carbohydrate origin (e.g. 2-furfural, hydroxymethyl furaldehyde, etc.) can be converted to chromophores resulting in yellowing (color reversion) or brightness reversion of the end product which is undesirable. Therefore such chromophore precursors should preferably be removed from the pulp at washing stages throughout pulping, bleaching and papermaking operations.
a more aggressive washing regime is required to remove such color-forming components and is accomplished by means of investment in new equipment and/or existing equipment upgrades. Not only does this generally correspond to increased water and energy consumption, additional washing may increase the yield loss.
Another means to reduce the concentration of chromophores precursors is to incorporate an additional stage into the bleaching sequence which not only necessitates significant capital expenditure, but also requires the increased usage of chemicals. Regardless of the treatment, certain color- forming materials may still remain within the washed pulp (especially those of carbohydrate origin).
the present invention therefore relates to a method for reducing or preventing yellowing/brightness reversion of pulp and paper during conditions associated with conventional use (e.g. storage, shipping, paper production, archiving, etc.) comprising entraping the chromophore precursors present in the pulp within cyclodextrin rings and removing the resulting inclusion complex, such as, during conventional washing by adding or generating the cyclodextrin before or during washing.
conventional use e.g. storage, shipping, paper production, archiving, etc.
the aspect of the present invention therefore relates to a method for reducing yellowing/brightness reversion of pulp and paper comprising direct addition of cyclodextrin to the pulp or in situ generation of cyclodextrin followed by a subsequent washing step to remove the formed cyclodextrin inclusion complexes.
the present invention relates to paper production and to the reduction of yellowing and/or brightness reversion of the pulp or the paper product.
Pulp can be prepared from wood (virgin pulp) in a conventional kraft pulping procedure as described above or from recycled paper. Frequently, pulp will be comprised of a combination of the two fibre sources. For the purposes of the present invention, any type of paper making process is relevant and/or any paper making pulp can be applied.
the amount of pulp based on recycled paper relative to the total amount of pulp is at least 2%, or at least 4%, or at least 6%, or at least 8%, or at least 10%, or at least 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90 or at least 95%.
the part of the pulp which is not derived from recycled paper may be derived from mechanical pulping, chemical pulping, and any mixtures thereof, such as, chemi-mechanical pulping, thermo-mechanical pulping, chemi-thermo-mechanical pulping, etc.
a papermaking pulp often comprises both recycled paper and fresh so-called virgin pulp.
the source of recycled fibre can be any of the grades of recycled furnishes known in the art or mixtures thereof, as well as mixtures of recycled fibres with virgin fibres.
Major grades of recycled fibre furnishes are for instance MOW (mixed office waste), SOW (sorted office waste), ONP (old newsprint), OMG (old magazines) and OCC (old corrugated containers).
raw or pre-treated wood chips are "cooked” under high pressure and temperature in the presence of alkali and sulfide to dissolve the polymeric lignaceous material between the individual wood fibers.
the liberated fibers still contain significant amounts of the colored lignaceous material within the fiber wall that can be removed to varying degrees via a spectrum of conventional bleaching operations/chemistries.
the bleached wood fiber may contain various amounts of residual lignin and extractives (e.g. resin acids, fatty acids, triglycerides, terpenes, terpenoids, waxes, etc.).
Extractives such as the hydrophobic fatty acids and esters are very problematic during paper making process. They can cause severe deposits on the process equipment. In addition, the presence of these extractive compounds has been associated with increased sensitivity to thermo-yellowing. Even after lipase treatment, the newly formed long chain fatty acids are still too hydrophobic to dissolve in the process water.
Suspected heat-sensitive precursors of chromophore molecules within conventionally pulped and bleached wood furnishes include residual lignin and extractives as well as oxidation, condensation and cyclization products of carbohydrate origin (e.g. 2-furfural, hydroxymethyl furaldehyde, etc.). Formation of chromophores, in response to elevated temperatures, ultimately manifests as a "yellowing” or "brightness reversion" of the end- product. In most instances, chromophore precursors are lipophilic with limited solubility within the process water.
a chromophore comprises any compound which will give rise to a coloring of the pulp or paper.
the chromophore can be formed from a chromophore precursor at elevated temperatures.
Cyclodextrin may effectively entrap the chromophore and/or chromophore precursor and enhance their solubility in water. This corresponds to enhanced removal of the chromophore/chromophore precursors from the pulp at the washing stage.
many of the precursors adversely affect certain physical properties of paper (i.e. tear, tensile, bulk, etc.) but physically disrupting interfiber interactions through adsorption onto the fiber surface.
Enhanced removal through formation of complexes with cyclodextrins may enable a degree of recovery of any number of these affected properties.
cyclodextins The most important feature of cyclodextins is their ability to form solid inclusion complexes (host-guest complexes).
the lipophilic cavity of cyclodextrin molecules provides a micro-environment into which an appropriately sized non-polar moiety can enter to form an inclusion complex.
Inclusion in cyclodextrins exerts a profound effect on physiochemical properties of guest molecules as they are temporarily locked or caged within the host cavity, which give rise to some unique beneficial modifications of the guest molecules.
the properties include solubility enhancement of highly insoluble guests, stabilization of labile guests against the degradation, masking off flavours, and controlled release of drugs and flavours.
solubility enhancement of entrapped chromophore/chromophore precursor molecules is utilized.
Cyclodextrin may effectively entrap those hydrophobic materials and enhance their solubility in water. Cyclodextrin can also work with lipases and other enzymes to improve the efficiency.
the paper making process comprises the following steps: a) preparing a pulp from wood and/or material comprising recycled paper; b) adding or in situ generating cyclodextrin; c) washing; d) making paper from the treated pulp.
steps a)-d) further, optional, steps may be included, for example one or more of the following steps: e) treating the pulp with one or more enzymes; f) de-inking, e.g. by pulping the fibres in the presence of an aqueous alkaline solution, optionally containing a peroxide compound, such as hydrogen peroxide; g) separation of the fibres from the contaminants, e.g. by screening (coarse and/or fine); h) centrifugal cleaning; i) flotation, e.g. using one or more surfactants; j) washing, e.g. using one or more surfactants; k) dispersion; e.g. using one or more surfactants; and/or
the enzyme may be introduced prior to the pulping, during a pulping stage, during or before, preferably right before, a stock preparation stage, or after a flotation or a de-inking stage.
a purpose of the present invention is therefore to provide a method for reducing yellowing of pulp and paper comprising adding to the pulp or in situ generating cyclodextrin followed by a subsequent washing step to remove the formed cyclodextrin inclusion complexes from the pulp.
the formation of the cyclodextrin inclusion complexes may also disrupt the conversion of the entrapped chromophore precursors.
Cyclodextrin may be used in the form of alpha-, beta-, and gamma-cyclodextrin. In one particular embodiment the cyclodextrin is alpha-cyclodextrin. Cyclodextrin should preferably be present during washing of the pulp but can be added at an earlier stage. In one embodiment cyclodextrin is added during pulp formation. In another embodiment cyclodextrin is added after pulp formation but before washing. In still another embodiment cyclodextrin is added during washing.
the ratio of fatty acid to cyclodextrin is in one embodiment in the range from 10:1 to 1 :100, particularly from 5:1 to 1:75, even more particularly from 2:1 to 1 :50.
cyclodextrin instead of adding cyclodextrin it could also be generated in situ, e.g. generated in the pulp from starch and glycosyltransferase (CGTase).
CGTase glycosyltransferase
the cyclodextrin is generated in situ from starch and glycosyltransferase.
enzymatic treatments may be employed as are well known in the art of paper making and include enzymes selected from the following group of enzymes: proteases, amylases, pullulanases, lipases, hemicellulases, endoglucanases, cutinases, and pectinases; as well as any combination thereof.
the present invention therefore relates to the combination of enzymatic treatment of pulp with addition of cyclodextrins.
Suitable enzymes are enzymes that will facilitate the release and complex formation of the chromophore or chromophore precursors.
Xylanase is known in the art as an enzyme capable of reducing yellowing of pulp and paper.
the cyclodextrin treatment of the pulp is combined with a xylanase treatment.
Example 1 Improved thermo stability of bleached eucalvpt kraft pulp (BEKP) by addition of alpha-cvclodextrin
Launder-Ometer beakers (The Launder-Ometer (Atlas Electric Devices Company, Chicago, IL, USA) is a standard piece of equipment used in the textile industry that spins the beakers, end-over-end, within a pre-heated, .water-filled chamber.) containing 400 g of 5% w/w consistency BEKP were prepared (the initial pH of the pulp was not adjusted prior to cyclodextrin application).
alpha-cyclodextrin was aliquoted to each beaker according to the chart above to achieve the desired final concentrations.
the handsheets were then "aged” for 15 minutes at 160 0 C and the optical qualitative measurements repeated.
thermo stability of BEKP was improved resulting in a reduction in yellowing of pulp pads by the addition of alpha-cyclodextrin.
Linoleic acid is the most abundant fatty acid in wood extractives and constitutes a potential chromophore.
a 0.1% linoleic acid suspension and a 1.0% alpha- cyclodextrin solution was prepared as follows:
Linoleic acid solution stays suspended as long as agitation is continued.
a 1.0% alpha-cyclodextrin solution was prepared by dissolving 2 g of alpha- cyclodextrinin 200 ml deionized water.
the 0.1% linoleic acid suspension was mixed with the 1.0 % cyclodextrin solution at different ratios of fatty acid to cyclodextrin and the increase in turbidity was determined.
the results are given in the Table 2 below.

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Chemical & Material Sciences (AREA)
Chemical Kinetics & Catalysis (AREA)
General Chemical & Material Sciences (AREA)
Life Sciences & Earth Sciences (AREA)
Engineering & Computer Science (AREA)
Wood Science & Technology (AREA)
Paper (AREA)

EP05769014A 2004-07-07 2005-07-07 Verwendung von cyclodextrin zur verringerung der vergilbung von pulpe und papier Withdrawn EP1774097A2 (de)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
US58600404P	2004-07-07	2004-07-07
PCT/US2005/024156 WO2006014563A2 (en)	2004-07-07	2005-07-07	Use of cyclodextrin for reducing yellowing of pulp and paper

Publications (1)

Publication Number	Publication Date
EP1774097A2 true EP1774097A2 (de)	2007-04-18

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ID=35787656

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP05769014A Withdrawn EP1774097A2 (de)	2004-07-07	2005-07-07	Verwendung von cyclodextrin zur verringerung der vergilbung von pulpe und papier

Country Status (9)

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US (1)	US20080041541A1 (de)
EP (1)	EP1774097A2 (de)
JP (1)	JP2008506046A (de)
CN (1)	CN101124362A (de)
AU (1)	AU2005269835A1 (de)
BR (1)	BRPI0512990A (de)
CA (1)	CA2572918A1 (de)
NO (1)	NO20070657L (de)
WO (1)	WO2006014563A2 (de)

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JP6694651B2 (ja) *	2014-11-07	2020-05-20	日本食品化工株式会社	油性インク除去剤及びその製造方法
JP7131296B2 (ja) *	2018-10-26	2022-09-06	王子ホールディングス株式会社	微細繊維状セルロース含有組成物およびその製造方法
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2005
- 2005-07-07 EP EP05769014A patent/EP1774097A2/de not_active Withdrawn
- 2005-07-07 CN CNA2005800230430A patent/CN101124362A/zh active Pending
- 2005-07-07 AU AU2005269835A patent/AU2005269835A1/en not_active Abandoned
- 2005-07-07 JP JP2007520511A patent/JP2008506046A/ja active Pending
- 2005-07-07 CA CA002572918A patent/CA2572918A1/en not_active Abandoned
- 2005-07-07 WO PCT/US2005/024156 patent/WO2006014563A2/en not_active Ceased
- 2005-07-07 US US11/571,638 patent/US20080041541A1/en not_active Abandoned
- 2005-07-07 BR BRPI0512990-7A patent/BRPI0512990A/pt not_active IP Right Cessation
2007
- 2007-02-05 NO NO20070657A patent/NO20070657L/no not_active Application Discontinuation

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Also Published As

Publication number	Publication date
CN101124362A (zh)	2008-02-13
WO2006014563A2 (en)	2006-02-09
CA2572918A1 (en)	2006-02-09
BRPI0512990A (pt)	2008-04-22
AU2005269835A1 (en)	2006-02-09
WO2006014563A3 (en)	2007-09-13
JP2008506046A (ja)	2008-02-28
US20080041541A1 (en)	2008-02-21
NO20070657L (no)	2007-02-06

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2007-11-07	RIC1	Information provided on ipc code assigned before grant	Ipc: D21C 9/02 20060101ALI20071004BHEP Ipc: D21C 9/10 20060101ALI20071004BHEP Ipc: D21H 17/24 20060101AFI20071004BHEP
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2010-12-08	18D	Application deemed to be withdrawn	Effective date: 20100202

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