EP1631716A2 - Verfahren zum bleichen von faserstoffen - Google Patents
Verfahren zum bleichen von faserstoffenInfo
- Publication number
- EP1631716A2 EP1631716A2 EP04731629A EP04731629A EP1631716A2 EP 1631716 A2 EP1631716 A2 EP 1631716A2 EP 04731629 A EP04731629 A EP 04731629A EP 04731629 A EP04731629 A EP 04731629A EP 1631716 A2 EP1631716 A2 EP 1631716A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- bleaching
- lime
- fiber
- additive
- fiber suspension
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 79
- 239000002657 fibrous material Substances 0.000 title claims abstract description 70
- 238000004061 bleaching Methods 0.000 title claims abstract description 64
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 55
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 55
- 239000004571 lime Substances 0.000 claims abstract description 55
- 239000007844 bleaching agent Substances 0.000 claims abstract description 39
- 239000000725 suspension Substances 0.000 claims abstract description 36
- 239000000654 additive Substances 0.000 claims abstract description 26
- 230000000996 additive effect Effects 0.000 claims abstract description 23
- 238000002156 mixing Methods 0.000 claims abstract description 15
- 229920005610 lignin Polymers 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 4
- 239000000835 fiber Substances 0.000 claims description 33
- 229920001131 Pulp (paper) Polymers 0.000 claims description 22
- 239000007787 solid Substances 0.000 claims description 19
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 239000000126 substance Substances 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 239000000123 paper Substances 0.000 claims description 10
- 239000000920 calcium hydroxide Substances 0.000 claims description 8
- QPCDCPDFJACHGM-UHFFFAOYSA-N N,N-bis{2-[bis(carboxymethyl)amino]ethyl}glycine Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(=O)O)CCN(CC(O)=O)CC(O)=O QPCDCPDFJACHGM-UHFFFAOYSA-N 0.000 claims description 7
- 239000008139 complexing agent Substances 0.000 claims description 7
- 229960003330 pentetic acid Drugs 0.000 claims description 7
- 230000002829 reductive effect Effects 0.000 claims description 7
- 239000003513 alkali Substances 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 230000035484 reaction time Effects 0.000 claims description 6
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 5
- 239000000292 calcium oxide Substances 0.000 claims description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 5
- 239000013505 freshwater Substances 0.000 claims description 5
- 235000019353 potassium silicate Nutrition 0.000 claims description 5
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 5
- 238000003860 storage Methods 0.000 claims description 5
- 241001264730 Callistemon salignus Species 0.000 claims description 4
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 4
- 229910019142 PO4 Inorganic materials 0.000 claims description 4
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 4
- 150000007513 acids Chemical class 0.000 claims description 4
- -1 artinite Chemical compound 0.000 claims description 4
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 4
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 4
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 4
- 238000009826 distribution Methods 0.000 claims description 4
- GRWZHXKQBITJKP-UHFFFAOYSA-L dithionite(2-) Chemical compound [O-]S(=O)S([O-])=O GRWZHXKQBITJKP-UHFFFAOYSA-L 0.000 claims description 4
- 230000001590 oxidative effect Effects 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 235000021317 phosphate Nutrition 0.000 claims description 4
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 4
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 3
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 3
- 239000000395 magnesium oxide Substances 0.000 claims description 3
- 235000012245 magnesium oxide Nutrition 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910021645 metal ion Inorganic materials 0.000 claims description 3
- 150000002739 metals Chemical class 0.000 claims description 3
- 235000010755 mineral Nutrition 0.000 claims description 3
- 239000011707 mineral Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 239000010893 paper waste Substances 0.000 claims description 3
- 150000003013 phosphoric acid derivatives Chemical class 0.000 claims description 3
- 238000009895 reductive bleaching Methods 0.000 claims description 3
- 239000012279 sodium borohydride Substances 0.000 claims description 3
- 229910000033 sodium borohydride Inorganic materials 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 229910021532 Calcite Inorganic materials 0.000 claims description 2
- 229910052656 albite Inorganic materials 0.000 claims description 2
- 229910052910 alkali metal silicate Inorganic materials 0.000 claims description 2
- 229910052915 alkaline earth metal silicate Inorganic materials 0.000 claims description 2
- DLHONNLASJQAHX-UHFFFAOYSA-N aluminum;potassium;oxygen(2-);silicon(4+) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Si+4].[Si+4].[Si+4].[K+] DLHONNLASJQAHX-UHFFFAOYSA-N 0.000 claims description 2
- AOPRFYAPABFRPU-UHFFFAOYSA-N amino(imino)methanesulfonic acid Chemical compound NC(=N)S(O)(=O)=O AOPRFYAPABFRPU-UHFFFAOYSA-N 0.000 claims description 2
- 229910052661 anorthite Inorganic materials 0.000 claims description 2
- 229910052599 brucite Inorganic materials 0.000 claims description 2
- 239000003054 catalyst Substances 0.000 claims description 2
- 230000003197 catalytic effect Effects 0.000 claims description 2
- 229920002678 cellulose Polymers 0.000 claims description 2
- 239000001913 cellulose Substances 0.000 claims description 2
- 238000000354 decomposition reaction Methods 0.000 claims description 2
- GWWPLLOVYSCJIO-UHFFFAOYSA-N dialuminum;calcium;disilicate Chemical compound [Al+3].[Al+3].[Ca+2].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-] GWWPLLOVYSCJIO-UHFFFAOYSA-N 0.000 claims description 2
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims description 2
- YGANSGVIUGARFR-UHFFFAOYSA-N dipotassium dioxosilane oxo(oxoalumanyloxy)alumane oxygen(2-) Chemical compound [O--].[K+].[K+].O=[Si]=O.O=[Al]O[Al]=O YGANSGVIUGARFR-UHFFFAOYSA-N 0.000 claims description 2
- TXKMVPPZCYKFAC-UHFFFAOYSA-N disulfur monoxide Inorganic materials O=S=S TXKMVPPZCYKFAC-UHFFFAOYSA-N 0.000 claims description 2
- 239000010459 dolomite Substances 0.000 claims description 2
- 229910000514 dolomite Inorganic materials 0.000 claims description 2
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 claims description 2
- 239000003112 inhibitor Substances 0.000 claims description 2
- 229910052622 kaolinite Inorganic materials 0.000 claims description 2
- 239000001095 magnesium carbonate Substances 0.000 claims description 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 2
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 2
- 229910052863 mullite Inorganic materials 0.000 claims description 2
- 229910052627 muscovite Inorganic materials 0.000 claims description 2
- 229910052652 orthoclase Inorganic materials 0.000 claims description 2
- 238000009896 oxidative bleaching Methods 0.000 claims description 2
- CHWRSCGUEQEHOH-UHFFFAOYSA-N potassium oxide Chemical compound [O-2].[K+].[K+] CHWRSCGUEQEHOH-UHFFFAOYSA-N 0.000 claims description 2
- 229910001950 potassium oxide Inorganic materials 0.000 claims description 2
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 2
- JVBXVOWTABLYPX-UHFFFAOYSA-L sodium dithionite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])=O JVBXVOWTABLYPX-UHFFFAOYSA-L 0.000 claims description 2
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 2
- 229910001948 sodium oxide Inorganic materials 0.000 claims description 2
- 235000010265 sodium sulphite Nutrition 0.000 claims description 2
- 239000003381 stabilizer Substances 0.000 claims description 2
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 claims description 2
- 239000000454 talc Substances 0.000 claims description 2
- 229910052623 talc Inorganic materials 0.000 claims description 2
- 230000000930 thermomechanical effect Effects 0.000 claims description 2
- 229910052882 wollastonite Inorganic materials 0.000 claims description 2
- 239000010456 wollastonite Substances 0.000 claims description 2
- 150000004649 carbonic acid derivatives Chemical class 0.000 claims 1
- 239000011111 cardboard Substances 0.000 claims 1
- 230000000295 complement effect Effects 0.000 claims 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims 1
- 239000011087 paperboard Substances 0.000 claims 1
- 229940079827 sodium hydrogen sulfite Drugs 0.000 claims 1
- 239000007788 liquid Substances 0.000 abstract description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 39
- 235000011121 sodium hydroxide Nutrition 0.000 description 13
- 239000000243 solution Substances 0.000 description 13
- 238000012360 testing method Methods 0.000 description 12
- 235000013336 milk Nutrition 0.000 description 8
- 239000008267 milk Substances 0.000 description 8
- 210000004080 milk Anatomy 0.000 description 8
- 235000011116 calcium hydroxide Nutrition 0.000 description 7
- 238000010790 dilution Methods 0.000 description 5
- 239000012895 dilution Substances 0.000 description 5
- 150000002978 peroxides Chemical class 0.000 description 4
- 239000002023 wood Substances 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 2
- KFSLWBXXFJQRDL-UHFFFAOYSA-N Peracetic acid Chemical compound CC(=O)OO KFSLWBXXFJQRDL-UHFFFAOYSA-N 0.000 description 2
- ABLZXFCXXLZCGV-UHFFFAOYSA-N Phosphorous acid Chemical class OP(O)=O ABLZXFCXXLZCGV-UHFFFAOYSA-N 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 238000004886 process control Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 229910052723 transition metal Inorganic materials 0.000 description 2
- 150000003624 transition metals Chemical class 0.000 description 2
- BDDLHHRCDSJVKV-UHFFFAOYSA-N 7028-40-2 Chemical compound CC(O)=O.CC(O)=O.CC(O)=O.CC(O)=O BDDLHHRCDSJVKV-UHFFFAOYSA-N 0.000 description 1
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical class [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000007900 aqueous suspension Substances 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005282 brightening Methods 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- CYPPCCJJKNISFK-UHFFFAOYSA-J kaolinite Chemical compound [OH-].[OH-].[OH-].[OH-].[Al+3].[Al+3].[O-][Si](=O)O[Si]([O-])=O CYPPCCJJKNISFK-UHFFFAOYSA-J 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- AMWRITDGCCNYAT-UHFFFAOYSA-L manganese oxide Inorganic materials [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 1
- PPNAOCWZXJOHFK-UHFFFAOYSA-N manganese(2+);oxygen(2-) Chemical class [O-2].[Mn+2] PPNAOCWZXJOHFK-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000005029 sieve analysis Methods 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- YNJBWRMUSHSURL-UHFFFAOYSA-N trichloroacetic acid Chemical compound OC(=O)C(Cl)(Cl)Cl YNJBWRMUSHSURL-UHFFFAOYSA-N 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
- 239000002349 well water 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
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/10—Bleaching ; Apparatus therefor
- D21C9/1005—Pretreatment of the pulp, e.g. degassing the pulp
Definitions
- the present invention relates to a method and an apparatus for bleaching fibrous materials, in particular lignin-containing fibrous materials for the production of paper.
- lignin-containing bleaching sequences are used in particular in industry, which today are halogen-free bleaching sequences, especially for environmental reasons, which use, for example, hydrogen peroxide, oxygen or ozone as a bleaching agent.
- the process control in particular the process conditions, is of crucial importance for achieving an optimal bleaching result.
- sodium hydroxide is used, which is added to the fiber with or before the addition of hydrogen peroxide as sodium hydroxide solution (aqueous solution of sodium hydroxide).
- sodium hydroxide solution aqueous solution of sodium hydroxide.
- dosing is also disadvantageous for the use of sodium hydroxide solution.
- a strong pH shift due to the use of sodium hydroxide solution again leads to a reduction in the initial degree of whiteness of the pulp to be bleached.
- the object of the present invention is to at least partially overcome the disadvantages known in the prior art and, in particular, to offer an inexpensive process which offers the use of a cheap base for use in the bleaching of fibrous materials for the paper industry.
- the object is achieved by a method according to claim 1.
- the object is also achieved by the device according to claim 25, preferred embodiments of the invention being the subject of the dependent claims.
- the method for bleaching fibrous materials has several steps, with at least one first additive being metered into a fibrous material suspension in at least one step.
- a fibrous suspension is understood to be an aqueous suspension of fibrous materials which in particular contains natural fibrous materials such as cellulose, waste paper, wood pulp and the like.
- the suspension can also have mineral and other constituents, as is caused in particular when using waste paper as a heterogeneous raw material.
- At least one bleaching solution is metered into the fibrous material, in particular the fibrous material suspension, this bleaching solution having at least one bleaching agent.
- both the first additive and the bleaching liquor are mixed with the fiber suspension, the bleaching process being ended according to the invention by the addition of at least one second additive.
- lime is used to adjust the pH of the fiber suspension, which according to a particularly preferred embodiment is at least partially dispersed in water.
- the pH value is adjusted by metering the lime in such a way that either the amount is metered as a function of a pH value determined in the fiber suspension and / or according to a particularly preferred embodiment, the metering is carried out as a function of the amount of bleaching agent used.
- metering is also conceivable, such as depending on the amount of fiber and / or the like, which are also understood as metering methods according to the invention.
- lime is understood to mean a substance which has at least one component which is selected from a group which comprises calcium hydroxide, calcium oxide, (calcium) carbonates, burned natural and / or synthetic minerals, such as orthoclase, albite, anorthite , Kaolinite, mullite, muscovite, calcite, magnesite, artinite, periclase, brucite, dolomite, wollastonite, talc, clinochlor.
- this group may have other substances which are preferably, but not exclusively, introduced as impurities and, for example, magnesium (oxide), aluminum silicates / oxides and / or transition metal components, in particular iron and manganese oxides / hydroxides; Sodium oxide, potassium oxide, silicon oxide, sulfur oxide) and bound gaseous components and the like.
- magnesium oxide
- aluminum silicates / oxides and / or transition metal components in particular iron and manganese oxides / hydroxides
- Sodium oxide, potassium oxide, silicon oxide, sulfur oxide bound gaseous components and the like.
- the wood pulp used is in particular stone wood sanding with and without chemical pretreatment, refiner wood pulp with and without chemical pretreatment, thermomechanical wood sanding, post-ground stone wood sanding, pressurized stone groundwood, refiner mechanical pulp, pressurized refiner mechanical pulp, chemical groundwood, chemical refiner mechanical pulp, chemical thermomechanical pulp and the like are understood.
- the method according to the invention is used for bleaching fibrous materials, the consistency of which is between 5% and 55%, preferably between 10% and 50%, particularly preferably between 15% and 46%.
- the consistency can be between 5 and 20% with a so-called low consistency, between 20 and 28% with a medium consistency and between 28 and 46% with a so-called high consistency.
- the consistency is reduced by adding process water and / or fresh water.
- the consistency of the fibrous material is increased mechanically and / or thermally and / or chemically, that is to say that liquid is removed from the dispersion.
- the mechanical increase in the consistency takes place by, for example, dewatering the fiber suspension by means of a twin-wire press, a disc filter or the like, as are known in the prior art.
- a chemical increase in consistency is understood to be the addition of dry constituents, such as lime, which was not at least partially dispersed by an upstream dispersion in water, but rather is metered in as a solid in the fibrous suspension and thereby the consistency of the fibrous suspension, that is to say the solids content based on a given volume, increased.
- the bleaching liquor which is added to the fiber suspension, contains at least one oxidative or reductive substance, which at least partially bleaches the fiber, in particular the at least partial destruction of chromophoric groups causes, as is known in the prior art.
- these agents are selected from a group which contains hydrogen peroxide, hypochloride, ozone, oxygen, sodium sulfite, formamidine sulfonic acid, sodium dithionite, sodium borohydride, peracetic acid, perchloroacetic acid, hydrosulfite and the like.
- the first additive is understood to be an auxiliary agent that is selected from a group consisting of water glass, in particular alkali and / or alkaline earth metal silicates, complexing agents such as DTPA, EDTA and phosphate and phosphonates, polyhydroxycarboxylic acids, Contains sugar derivatives, stabilizers, catalysts, inhibitors and the like.
- the bleach liquor is complemented with second additives which, according to a further particularly preferred method, are selected from a group consisting of reductive and oxidative agents, such as hydrosulfite, sodium bisulfite, sodium bisulfite, sodium borohydride and the like contains.
- second additives which, according to a further particularly preferred method, are selected from a group consisting of reductive and oxidative agents, such as hydrosulfite, sodium bisulfite, sodium bisulfite, sodium borohydride and the like contains.
- they serve, inter alia, to reduce residues of the bleaching agent supplied by means of the bleaching solution at the end of the bleaching process to such an extent that their effectiveness for a subsequent further treatment is not disadvantageous for the use of further bleaching agents, for example in a second stage.
- these can be different bleaching agents, but there is also the possibility of using a specific agent to achieve the effect in a single step.
- the lime is stored as a solid which is essentially continuously removed from a container.
- essentially continuous means both intermittent and continuous removal, with and without interruptions, and mixed forms thereof.
- the removal speed does not have to be constant, but can be regulated and / or controlled according to the specified dosage.
- the lime has a solids content which is between 92% and 100%, preferably between 95% and 99.9%, and particularly preferably between 98% and 99.5%.
- the lime milk in the fiber suspension has a solids content which is between 5% and 40%, preferably between 7% and 25% and particularly preferably between 10% and 20% and in particular below 17%.
- the solids contents are determined in accordance with the regulations of the German industrial standard, such as DIN ISO 787, part 2, or the TAPPI standards known in the prior art. The same applies to the determination of further characteristic values, which are used as process parameters,
- the lime can also be metered into the fiber material as a solid, the lime having a predetermined particle size distribution according to a particularly preferred method.
- the lime can be dosed before the first additive and the bleaching solution are added to the fiber suspension, and the lime can also be added after the first additive and before the bleaching solution is added. According to a further particularly preferred embodiment, the lime can also be metered into the fiber suspension at substantially the same time as at least one first additive.
- a pH in the pulp suspension which is between 8 and 12, preferably between 9 and 11 and particularly preferably between 10.3 and 10.8.
- the amount of lime added can be between 0.01% and 5%, preferably between 0.1% and 2% and particularly preferably between 0.3% and 1%.
- a dosage depending on the amount of bleach is provided according to a further exemplary embodiment, a ratio between hydrogen peroxide and lime between 0.1 and 5, preferably between 1 and 3 and particularly preferably between 2.4 and 2.7 being selected.
- the fibrous material is brought to a temperature between 40.degree. C. and 100.degree. C. by adding steam, in particular low-pressure steam and / or by introducing mechanical energy, as is the case, for example, when mixing in a high-consistency mixer , preferably between 45 ° C and 90 ° C and particularly preferably between 60 ° C and 70 ° C.
- the second additive can be added after the fiber material has been diluted, with adequate mixing also being ensured here.
- process water is used for the dilution of the fibrous material, process water being understood as production water which is obtained in the field of fiber bleaching, paper production or corresponding process stages.
- a complexing agent is added to the fibrous material, in particular the fibrous material suspension, which in particular reduces the catalytic effect on the decomposition of at least one bleaching agent by metals such as transition metals, in particular metal ions.
- metals such as transition metals, in particular metal ions.
- DTPA diethylenetriaminepentaacetic acid
- EDTA ethylenetriamine tetraacetic acid
- phosphates phosphates
- phosphonates polycarboxylic acids
- sugar derivatives polyhydroxycarboxylic acids and the like
- the object is further achieved by a device for bleaching fibrous materials, which have at least one mixer and a reaction space in which the aqueous fibrous material suspension is exposed to at least one bleach, in particular bleaching stage, under predetermined conditions.
- This device is further characterized in that a metering device is provided which regulates and / or controls the addition of lime, in particular an at least partially water-dispersed lime, into the aqueous fiber suspension in dependence on predetermined process parameters.
- a metering device is provided which regulates and / or controls the addition of lime, in particular an at least partially water-dispersed lime, into the aqueous fiber suspension in dependence on predetermined process parameters.
- the process parameters are selected from a group of parameters which determine the pH value, the amount of bleaching agent, the amount of bleaching liquor, the brightening, contains the degree of whiteness, the color locus, the reaction time, the bleaching temperature, the residual bleach content, the amount of fiber, the solids content, the consistency, the pressure, the mixing and the like.
- the lime is preferably taken substantially continuously as a solid from a storage container before being added to the fiber suspension and is diluted with water to a predetermined solid content.
- Fresh water such as well water and / or surface water and / or process water, can be used here in particular as possible dilution water.
- a device for bleaching fibrous materials which has at least a first container for storing lime, which has a predetermined particle size distribution and purity, a removal device and a transport and / or mixing device in which the lime is dissolved and / or is dispersed, and further comprises at least one second container to which the lime is transported and in which it is mixed with a fiber suspension under predetermined process parameters.
- Fig. 1 is a flow chart for performing the method for bleaching fibrous materials according to the invention.
- FIG. 1 shows a schematic flow diagram for carrying out the method for bleaching lignin-containing wood materials, such as are used, for example, in the production of stone wood pulp for the production of papers, in particular bulk printing papers.
- the fibrous material is removed from a storage container 1, the so-called stacking tower, the wood pulp being diluted by the addition of process water 20, such as filtrate, for ease of transport and fed to a mechanical thickening device 2 via a feed system.
- process water 20 such as filtrate
- the thickening device 2 can be, for example, a twin-wire press which increases the consistency of the wood pulp to a range between 25% and 28% solids content.
- a first additive such as a complexing agent
- a first additive can be metered into the fibrous material already in the storage container, at its outlet or in the transport device, the metering amount being dependent in particular on the loading of the fibrous material or the dilution water with possibly catalytically active metals, especially metal ions.
- 0.3% DTPA per 9 t of ground wood are added to the ground wood.
- the thickened fibrous material is transported from the twin-wire press 2 to a mixing device 4 via a discharge screw 3 and a transport device.
- the lime is already added to the fibrous material in the discharge screw 3, the discharge screw 3 being used in particular to mix the fibrous material with the lime milk.
- the fibrous material is torn, loosened up and transported.
- an exposure time between the addition of the lime milk and the subsequent metering of further additives or bleaching agents is selected by the position of the metering point, taking into account the flow conditions.
- the exposure time is preferably between 10 and 60 seconds.
- the mixing of the fibrous material after the addition of a further additive, such as, for example, an alkali or alkaline earth silicate, and the addition of the bleaching liquor, in particular the bleaching agent, is carried out in accordance with the process shown here using a highly consistent mixer 4.
- the consistency is between 18% and 35% , wherein according to the embodiment shown here, a so-called high consistency mixer (Kamyr mixer) is used, as is known in the prior art.
- Kamyr mixer so-called high consistency mixer
- other mixing devices can also be used, such as in particular, but not exclusively, a twin-shaft mixer, in particular if the consistency of the fibrous material is set in the low or medium concentration range.
- the fibrous material is brought into one by means of at least one transport device, such as, for example, a screw conveyor 5 with a material density> 20% Reaction space 6, such as a bleaching tower, promoted.
- a transport device such as, for example, a screw conveyor 5 with a material density> 20% Reaction space 6, such as a bleaching tower, promoted.
- the fibrous material is heated to a predetermined temperature by supplying mechanical energy in the high-consistency mixer and / or by adding low-pressure steam.
- this is between 55 ° C. and 70 ° C., it being pointed out that, especially when using alkali and / or alkaline earth silicate, it is disadvantageous to exceed the temperature of 80 ° C., since at this temperature already a Failure of the additives, e.g. can occur due to the formation of quartz sand.
- the residence time of the fiber material containing the bleaching agent and the milk of lime in the bleaching tower is 30 to 180 minutes, the reaction time depending in particular on the whiteness to be achieved and / or residual content of bleaching agent in the fibrous material is determined.
- the reaction time is between 60 minutes and 3 hours with a consistency of approximately 20% to 27% and a temperature between 60 ° C. and 70 ° C.
- the pH value in the initial range is approx. 10.8% to 11.2% and drops to a value between 6.3% and 7.3% in the course of the bleaching stage.
- the fibrous material is diluted with process water 24 after a removal point, the consistency according to the exemplary embodiment shown here then being between 2 and 5%.
- the fibrous material removed from the bleaching tower 6 is provided with a second additive before and / or after the dilution with process water, which according to the exemplary embodiment shown here reduces the amount of residual bleaching agent still present in the fibrous material in such a way that the bleaching stage ends becomes.
- this fiber material is a further mechanical dewatering device 7 - z.
- the fibrous material is collected in the discharge screw and fed to a storage chest 9.
- the degree of whiteness of the fiber material is increased in a subsequent second stage by using a further, in particular reductive bleaching agent, and / or the color location is changed.
- This bleach can, for example, in turn in a reaction vessel, for. B. a bleaching tower 10, take place, the reaction time here also essentially depends on the agent used.
- the then completely bleached wood pulp is temporarily stored for processing in the manufacture of paper 12 in a so-called stock chest 11.
- a high-consistency mixer (Kamyr mixer) and a double-shaft mixer were used as mixing units in test series 1, 3 and 4.
- the consistency was 26% in test series 1 and 2, 20 to 25% in test series 2 and approximately 17.5% in test series 4.
- the reaction temperature was set to 65 ° C. for experiment 1 and was approximately 55 ° C. for experiment 2.
- lime calcium hydroxide; Ca (0H) 2
- the lime was stored as a solid in a silo and by means of a removal device and an associated Dispersing device diluted to a solids content of approx. 17% with fresh water.
- the bulk density of the lime was 0.5 g / cm 3 , (EP 459-2), the sieve analysis according to EP 459-2 0.0% residue with a 0.2 mm sieve and 2.1% residue with 0, 09 mm sieve resulted.
- the quantities used in the recipe information generally refer to the amount of dry wood pulp entered.
- the process control corresponds to the flow diagram shown in FIG. 1.
- Residual peroxide 90 - 800 or 200 - 350
- the residual peroxide content as an expression of the bleaching effect of the peroxide with the fiber material was significantly lower compared to the results when using sodium hydroxide solution, values between 20 and 300 and between 20 and 150 being determined.
- the measurement was carried out in the filtrate of the fiber before dilution after bleaching in the reaction chamber.
- test series 1 and 2 was used as a control parameter for the use of hydrogen peroxide.
- lime as a bleaching agent is also interesting from an economic point of view.
- the price level for slaked lime as a refinement product of a raw material present in nature is far below that of the sodium hydroxide solution, which is produced in a complex process by chlor-alkali electrolysis. It is also far less volatile. It should also be pointed out that the actual bleach requirement can be reduced significantly in some cases.
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
- Detergent Compositions (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10320618A DE10320618A1 (de) | 2003-05-08 | 2003-05-08 | Verfahren zum Bleichen von Faserstoffen |
PCT/EP2004/004914 WO2004099492A2 (de) | 2003-05-08 | 2004-05-07 | Verfahren zum bleichen von faserstoffen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1631716A2 true EP1631716A2 (de) | 2006-03-08 |
EP1631716B1 EP1631716B1 (de) | 2009-04-01 |
Family
ID=33305182
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04731629A Expired - Lifetime EP1631716B1 (de) | 2003-05-08 | 2004-05-07 | Verfahren zum bleichen von faserstoffen |
Country Status (6)
Country | Link |
---|---|
US (1) | US20060130984A1 (de) |
EP (1) | EP1631716B1 (de) |
AT (1) | ATE427377T1 (de) |
CA (1) | CA2525210C (de) |
DE (2) | DE10320618A1 (de) |
WO (1) | WO2004099492A2 (de) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7643818B2 (en) * | 2004-11-22 | 2010-01-05 | Seven Networks, Inc. | E-mail messaging to/from a mobile terminal |
CN100338295C (zh) * | 2005-11-03 | 2007-09-19 | 苏州大学 | 大豆蛋白纤维漂白组合物及其漂白方法 |
US20100224336A1 (en) * | 2005-12-14 | 2010-09-09 | University Of Maine System Board Of Trustees | Process of bleaching a wood pulp |
US20070131364A1 (en) * | 2005-12-14 | 2007-06-14 | University Of Maine | Process for treating a cellulose-lignin pulp |
DE102007007654A1 (de) * | 2007-02-13 | 2008-08-14 | Voith Patent Gmbh | FAS Bleiche |
DE102009050570B4 (de) * | 2008-10-23 | 2017-07-06 | Bene_Fit Systems Gmbh & Co. Kg | Herstellungsverfahren für gebleichte organische Fasermaterialien und Verwendung eines Bleichmittels |
DE102009046797A1 (de) * | 2009-11-18 | 2011-05-19 | Voith Patent Gmbh | Bleiche |
CN103237902A (zh) * | 2010-08-13 | 2013-08-07 | Rdm企业股份有限公司 | 减少糖的颜色的方法和组合物 |
CN106835683A (zh) * | 2016-12-28 | 2017-06-13 | 淄博大染坊丝绸集团有限公司 | 一种提高真丝斜纹绸渗透性的漂练工艺 |
CN110528302A (zh) * | 2019-07-15 | 2019-12-03 | 华南理工大学 | 一种臭氧处理热磨机械浆纤维表面的方法 |
CN114195161B (zh) * | 2021-12-16 | 2024-01-23 | 中国有色桂林矿产地质研究院有限公司 | 一种提高滑石浆渣白度的方法 |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2101706A (en) * | 1936-02-04 | 1937-12-07 | Tomahawk Kraft Paper Company | Bleaching of pulp |
US2214715A (en) * | 1938-06-30 | 1940-09-10 | Separation Process Company | Cement manufacture |
US2413583A (en) * | 1945-08-11 | 1946-12-31 | St Regis Paper Co | Bleaching of groundwood |
NL76171C (de) * | 1950-05-23 | 1900-01-01 | ||
US2687942A (en) * | 1951-03-19 | 1954-08-31 | Du Pont | Bleaching of groundwood-sulfite pulp mixtures |
US3100732A (en) * | 1959-10-05 | 1963-08-13 | Du Pont | Process of bleaching wood pulp by combined treatment with peroxide and an alkali metal borohydride |
FR1393492A (fr) * | 1964-02-11 | 1965-03-26 | Du Pin Cellulose | Perfectionnement au blanchiment des pâtes à papier |
ZA761255B (en) * | 1975-03-11 | 1977-03-30 | Erco Envirotech Ltd | Bleachplant operation |
US5401362A (en) * | 1993-03-24 | 1995-03-28 | Kamyr, Inc. | Control of metals and dissolved organics in the bleach plant |
US5639347A (en) * | 1993-03-24 | 1997-06-17 | Ahlstrom Machinery Inc. | Method of controlling of metals in a bleach plant, using oxidation |
ATE184060T1 (de) * | 1993-04-20 | 1999-09-15 | Eka Chemicals Ab | Verfahren zum bleichen von lignozellulose- enthaltendem zellstoff |
USH1690H (en) * | 1995-07-20 | 1997-11-04 | Nye; Jeffrey | Process for bleaching kraft pulp |
JP3698178B2 (ja) * | 1995-09-22 | 2005-09-21 | 三菱瓦斯化学株式会社 | 製紙用化学パルプの漂白方法 |
ES2219861T3 (es) * | 1998-09-22 | 2004-12-01 | Alfred Pohlen | Procedimiento para la eliminacion de impurezas pegajosas de pasta de papel obtenida a partir de papel viejo preparado, mediante minerales convertidos en hidrofobos. |
-
2003
- 2003-05-08 DE DE10320618A patent/DE10320618A1/de not_active Withdrawn
-
2004
- 2004-05-07 CA CA2525210A patent/CA2525210C/en not_active Expired - Fee Related
- 2004-05-07 WO PCT/EP2004/004914 patent/WO2004099492A2/de active Application Filing
- 2004-05-07 AT AT04731629T patent/ATE427377T1/de active
- 2004-05-07 EP EP04731629A patent/EP1631716B1/de not_active Expired - Lifetime
- 2004-05-07 DE DE502004009271T patent/DE502004009271D1/de not_active Expired - Lifetime
- 2004-05-07 US US10/555,934 patent/US20060130984A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO2004099492A3 * |
Also Published As
Publication number | Publication date |
---|---|
CA2525210A1 (en) | 2004-11-18 |
WO2004099492A2 (de) | 2004-11-18 |
ATE427377T1 (de) | 2009-04-15 |
US20060130984A1 (en) | 2006-06-22 |
WO2004099492A3 (de) | 2004-12-09 |
DE502004009271D1 (de) | 2009-05-14 |
EP1631716B1 (de) | 2009-04-01 |
CA2525210C (en) | 2011-03-15 |
DE10320618A1 (de) | 2004-11-18 |
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