EP0239583B1 - Procede de pre-traitement d'une pulpe avec des stabilisateurs et du peroxyde avant le raffinage mecanique - Google Patents
Procede de pre-traitement d'une pulpe avec des stabilisateurs et du peroxyde avant le raffinage mecanique Download PDFInfo
- Publication number
- EP0239583B1 EP0239583B1 EP19860905113 EP86905113A EP0239583B1 EP 0239583 B1 EP0239583 B1 EP 0239583B1 EP 19860905113 EP19860905113 EP 19860905113 EP 86905113 A EP86905113 A EP 86905113A EP 0239583 B1 EP0239583 B1 EP 0239583B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- chips
- per litre
- impregnation solution
- impregnation
- peroxide
- 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.)
- Expired
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- 150000002978 peroxides Chemical class 0.000 title claims abstract description 132
- 238000007670 refining Methods 0.000 title claims abstract description 78
- 239000003381 stabilizer Substances 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims description 93
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 24
- 244000144992 flock Species 0.000 claims abstract description 19
- 238000005470 impregnation Methods 0.000 claims description 203
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 78
- 230000008569 process Effects 0.000 claims description 72
- 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 45
- 229960003330 pentetic acid Drugs 0.000 claims description 45
- 239000000126 substance Substances 0.000 claims description 38
- 239000004115 Sodium Silicate Substances 0.000 claims description 35
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 35
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 35
- 239000002738 chelating agent Substances 0.000 claims description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 239000013522 chelant Substances 0.000 claims description 22
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 18
- 229910052751 metal Inorganic materials 0.000 claims description 17
- 239000002184 metal Substances 0.000 claims description 17
- 239000011777 magnesium Substances 0.000 claims description 16
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 15
- 229910052749 magnesium Inorganic materials 0.000 claims description 15
- 238000000354 decomposition reaction Methods 0.000 claims description 14
- 239000000356 contaminant Substances 0.000 claims description 13
- 159000000003 magnesium salts Chemical class 0.000 claims description 13
- URDCARMUOSMFFI-UHFFFAOYSA-N 2-[2-[bis(carboxymethyl)amino]ethyl-(2-hydroxyethyl)amino]acetic acid Chemical compound OCCN(CC(O)=O)CCN(CC(O)=O)CC(O)=O URDCARMUOSMFFI-UHFFFAOYSA-N 0.000 claims description 11
- 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 11
- 229960001484 edetic acid Drugs 0.000 claims description 11
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 11
- 229910021645 metal ion Inorganic materials 0.000 claims description 10
- MGFYIUFZLHCRTH-UHFFFAOYSA-N nitrilotriacetic acid Chemical compound OC(=O)CN(CC(O)=O)CC(O)=O MGFYIUFZLHCRTH-UHFFFAOYSA-N 0.000 claims description 10
- 150000004760 silicates Chemical class 0.000 claims description 10
- 229940042400 direct acting antivirals phosphonic acid derivative Drugs 0.000 claims description 9
- 150000003007 phosphonic acid derivatives Chemical class 0.000 claims description 9
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 8
- 239000011121 hardwood Substances 0.000 claims description 8
- 244000166124 Eucalyptus globulus Species 0.000 claims description 7
- 241000796765 Gmelina <amphipod> Species 0.000 claims description 7
- 238000004537 pulping Methods 0.000 claims description 7
- 239000000377 silicon dioxide Substances 0.000 claims description 7
- 235000012239 silicon dioxide Nutrition 0.000 claims description 7
- 241000183024 Populus tremula Species 0.000 claims description 6
- 239000011122 softwood Substances 0.000 claims description 6
- 235000008331 Pinus X rigitaeda Nutrition 0.000 claims description 5
- 241000018646 Pinus brutia Species 0.000 claims description 5
- 235000011613 Pinus brutia Nutrition 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 239000002244 precipitate Substances 0.000 claims description 4
- 241000609240 Ambelania acida Species 0.000 claims description 3
- 239000010905 bagasse Substances 0.000 claims description 3
- 239000010902 straw Substances 0.000 claims description 3
- 244000283070 Abies balsamea Species 0.000 claims description 2
- 235000007173 Abies balsamea Nutrition 0.000 claims description 2
- 239000012978 lignocellulosic material Substances 0.000 claims 3
- ABLZXFCXXLZCGV-UHFFFAOYSA-N Phosphorous acid Chemical compound OP(O)=O ABLZXFCXXLZCGV-UHFFFAOYSA-N 0.000 claims 1
- 239000000835 fiber Substances 0.000 abstract description 32
- 230000015572 biosynthetic process Effects 0.000 abstract description 6
- 238000011065 in-situ storage Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000002203 pretreatment Methods 0.000 abstract 2
- 229920001131 Pulp (paper) Polymers 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 120
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 75
- 238000004061 bleaching Methods 0.000 description 65
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 44
- 235000019341 magnesium sulphate Nutrition 0.000 description 22
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 20
- 238000010411 cooking Methods 0.000 description 18
- 239000002023 wood Substances 0.000 description 17
- 238000011282 treatment Methods 0.000 description 15
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 14
- 238000006277 sulfonation reaction Methods 0.000 description 14
- 239000002994 raw material Substances 0.000 description 12
- 229920005610 lignin Polymers 0.000 description 11
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 11
- 239000007864 aqueous solution Substances 0.000 description 10
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 9
- 102100031260 Acyl-coenzyme A thioesterase THEM4 Human genes 0.000 description 8
- 101000638510 Homo sapiens Acyl-coenzyme A thioesterase THEM4 Proteins 0.000 description 8
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 7
- 230000006835 compression Effects 0.000 description 7
- 238000007906 compression Methods 0.000 description 7
- 229910001425 magnesium ion Inorganic materials 0.000 description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000010998 test method Methods 0.000 description 6
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 description 5
- 235000010265 sodium sulphite Nutrition 0.000 description 5
- 241001236219 Pinus echinata Species 0.000 description 4
- 235000005018 Pinus echinata Nutrition 0.000 description 4
- 235000017339 Pinus palustris Nutrition 0.000 description 4
- 239000007844 bleaching agent Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000011734 sodium Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000021523 carboxylation Effects 0.000 description 3
- 238000006473 carboxylation reaction Methods 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 230000002939 deleterious effect Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000013055 pulp slurry Substances 0.000 description 3
- 241000894007 species Species 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 241000006121 Eucalyptus regnans Species 0.000 description 2
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 150000007942 carboxylates Chemical group 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002657 fibrous material Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- YIXJRHPUWRPCBB-UHFFFAOYSA-N magnesium nitrate Chemical compound [Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YIXJRHPUWRPCBB-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- JVBXVOWTABLYPX-UHFFFAOYSA-L sodium dithionite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])=O JVBXVOWTABLYPX-UHFFFAOYSA-L 0.000 description 2
- 235000018185 Betula X alpestris Nutrition 0.000 description 1
- 235000018212 Betula X uliginosa Nutrition 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 241000218657 Picea Species 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000008139 complexing agent Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 238000009897 hydrogen peroxide bleaching Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 230000000415 inactivating effect Effects 0.000 description 1
- 230000002779 inactivation Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- 229910052919 magnesium silicate Inorganic materials 0.000 description 1
- WRUGWIBCXHJTDG-UHFFFAOYSA-L magnesium sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Mg+2].[O-]S([O-])(=O)=O WRUGWIBCXHJTDG-UHFFFAOYSA-L 0.000 description 1
- 229940061634 magnesium sulfate heptahydrate Drugs 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- -1 sodium hydrosulfite Chemical class 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 150000003464 sulfur compounds Chemical class 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
- 238000004383 yellowing Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/14—Disintegrating in mills
- D21B1/16—Disintegrating in mills in the presence of chemical agents
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/02—Pretreatment of the raw materials by chemical or physical means
- D21B1/021—Pretreatment of the raw materials by chemical or physical means by chemical means
Definitions
- Pulping processes can be broadly classified into high yield processes using mechanical fiberizing equipment and low yield processes using chemical reactions to produce individual fibers or pulp from lignocellulosic raw materials, usually wood in chip form.
- high yield category there are many variations which involve varying combinations of chemical, mechanical, and thermal treatments to effect fiber separation, remove some lignin and other chemical components from the original fibers, or increase the brightness and papermaking strength of the resulting fibers.
- This invention is directed to the art of high yield pulping in which mechanical treatment either with or without heat is the primary means of fiber separation and mild chemical treatment is used to facilitate fiber separation and to increase the papermaking strength and brightness. The application of heat may be utilized in combination with mechanical and chemical treatments to further assist in fiber separation and to accelerate chemical reactions.
- the primary goal of this invention is to economically produce pulp in the highest possible yield of the original lignocellulosic raw material by retaining and chemically modifying the lignin in the fibers to obtain the desired papermaking properties.
- alkaline peroxide pretreatment of chips softens the lignocellulosic raw material resulting in easier fiber separation (less energy consumption) and less fines generations (fiber fragmentation) during refining.
- refiner bleaching with alkaline peroxide can potentially eliminate the need for separate post-refiner bleaching equipment, due to the facts that refiners are excellent mixers of pulp and bleaching agents, and the temperature within the refiner (about 100°C) causes bleaching to occur extremely fast relative to typical post-refiner alkaline peroxide bleaching steps (approximately 50 to 80°C).
- wood chips have been pretreated by impregnation and/or refining with chelants (U.S. Patent Nos. 3,023,140-Textor, 4,311,553-Akerlund et al., Japanese Patent Application No. 80-72091, and Federal Republic of Germany Patent No. 2818-320) or with sodium silicate (U.S. Patent Nos. 3,069,309-Fennell, 4,311,553-Akerlund et al.), or with magnesium salts (U.S. Patent Nos. 3,023,140-Textor, 3,069,309-Fennell, 4,311,553-Akerlund et al.
- Chips are usually in the size range of less than 3 centimeters average diameter but can vary.
- Suitable hardwoods include Aspen, Gmelina, Eucalyptus, Birch, Beech, Oak and Ash.
- Suitable softwoods include Pine, Spruce, Fir and Hemlock.
- Impregnation steps can be accomplished by squeezing the chips to expel excess liquids and air followed by allowing the chips to expand into the impregnation solution.
- impregnation solutions of steps B and C can be combined into a single impregnation solution and impregnation step.
- the alkaline peroxide impregnated chips are then refined in one or more stage(s) under atmospheric pressure or superatmospheric pressure.
- the refining pressure is usually associated with steam added to or generated within the refining device.
- This invention is useful in producing fibrous pulps from lignocellulosic raw materials such as softwoods, hardwoods, bagasse, straw and other similar fibrous materials which have been chopped or cut into appropriate sized pieces known in the art as chips for pulping into individual fiber form.
- lignocellulosic raw materials such as softwoods, hardwoods, bagasse, straw and other similar fibrous materials which have been chopped or cut into appropriate sized pieces known in the art as chips for pulping into individual fiber form.
- the resulting high yield (yield of 80% or higher of the original lignocellulosic raw material) non-sulfonated pulp has properties equal to or superior to sulfonated pulps prepared in similar yields from the same lignocellulosic raw materials. These properties are high brightness and papermaking strength, and low fines content.
- the process has the advantages of lower capital and operating costs to produce pulps of equal or better quality than comparable sulfonated pulps because of lower equipment costs for the pulping and waste treatment processes, and lower operating costs due to less chemical usage, lower refining energy, and easier treatment of process effluents.
- all parts are by weight unless otherwise specified, and all parts based upon the weight of chips are based upon the oven-dried weight of the chips.
- the chips Prior to the first impregnation step, the chips are preferably saturated with water and/or steam to expel any entrapped air in accordance with conventional procedures. Before and as a part of each impregnation step, the chips are preferably squeezed to expel liquid and any remaining air, and then allowed to expand into the impregnation solution so as to absorb the impregnation solution.
- the quantity of solution absorbed is influenced by the impregnation device and the particular material being impregnated.
- the level of chemical addition into the chips is primarily controlled by the concentration of the particular chemical in the impregnation solution, the degree of chip compression in the impregnation device, and the density of the chips being treated.
- the first impregnation solution is an aqueous solution consisting of stabilizers for peroxide and optionally chelating agents and has a pH, temperature, and concentration so as to avoid precipitation of the solutes in the impregnation solution. If a chelating agent is used in the first impregnation solution to effectively chelate deleterious metal ions like manganese, iron, and copper, the pH, temperature and concentration should also be selected to impede the chelant from combining with or inactivating the stabilizers.
- magnesium sulfate As the stabilizer but other stabilizers can be used such as water soluble magnesium salts (e.g., magnesium chloride, magnesium nitrate, magnesium carbonate, and combinations thereof).
- chelating agents or complexing agents in the first impregnation solution such as diethylene triaminepentaacetic acid (DTPA), ethylene diaminetetraacetic acid (EDTA), hydroxyethylethylenediaminetriacetic acid (HEEDTA), nitrilotriacetic acid (NTA) sodium tripolyphosphate (STPP) and phosphonic acid derivatives or other similar compounds known in the art for such functionality.
- DTPA diethylene triaminepentaacetic acid
- EDTA ethylene diaminetetraacetic acid
- HEEDTA hydroxyethylethylenediaminetriacetic acid
- NTA nitrilotriacetic acid
- STPP sodium tripolyphosphate
- the concentration of magnesium salt in the impregnation solution is preferably between 0.01 and 2.0 grams per liter calculated based upon the weight of magnesium in the salt so as to result in a magnesium content of the chips equivalent to preferably from 0.001% to 0.2% of the weight of chips.
- the chelating agent concentration in the impregnation solution should be preferably from 0.01 gram per liter to 20 grams per liter (expressed as 100% chelating agent in the solution) to give preferably 0.001% to 2.0% chelant based on the dry weight of chips but chelant concentration and addition level may extend beyond such ranges depending upon the specific chelating agent and the quantity and species of metal contaminants contained in the chips.
- the temperature of the second impregnation step is preferably between 15°C and 100°C (60°C and 212°F), and the pH is higher than the pH of the first impregnation solution and preferably greater than 9 with from 9 to 12 being particularly preferred and between 10 and 11 being most preferred. Adjustment to the solution pH can be made in the same manner as described for the first impregnation solution.
- the second impregnation of the chips results in between 0.1 % and 10% silicates, calculated as Si0 2 based upon the dry weight of the chips.
- the third impregnating solution is an aqueous alkaline peroxide solution which may also contain a combination of the stabilizers employed in the first and second impregnation solutions primarily for stabilizing the peroxide outside the chips.
- the third impregnation solution contains magnesium and silicate stabilizers, and optionally chelating agents of the types and in concentrations and addition levels described for the first and second impregnation solutions.
- the third impregnation solution contains preferably hydrogen peroxide or any other peroxygen compound suitable for bleaching, in the concentration range of preferably between 10 and 100 grams per liter (calculated and expressed as hydrogen peroxide) to give addition levels of preferably between 0.5% and 10% of the weight of chips expressed as hydrogen peroxide.
- an alkaline substance preferably sodium hydroxide
- the temperature of the third impregnating solution is preferably between 15°C and 100°C (60°F and 212°F).
- Example 1 For Example 1, two impregnation stages were used.
- the third impregnation solution was an aqueous solution containing 5.28 grams/liter of Epsom salt, 0.4 grams/liter of DTPA, 21.1 grams/liter sodium silicate solution, 50 grams/liter of sodium hydroxide, and 60 grams/liter of hydrogen peroxide (added as a stabilized 50% H 2 0 2 solution) and had a PH of 11.7.
- Example A the same impregnating procedures, chemicals and equipment were used as in Examples 1 and 2 except that a single impregnation step was used containing all of the chemicals used in Examples 1 and 2 but the amount of DTPA was reduced because the higher levels of DTPA would be incompatible and react with hydrogen peroxide when combined in a single solution.
- Example 1 After the impregnation step, the chips from Example A were refined, and the resulting pulp was treated after refining as in Example 1. The pulp was then tested for brightness and the amount of hydrogen peroxide consumed was determined. The results are given in Table 1.
- Example A consumed 7.5% hydrogen peroxide based on the dry weight of the wood chips but achieved a brightness of only 60% (Elrepho brightness).
- the two-step impregnation sequence of Example 1 achieved a brightness of 72% Elrepho while only consuming 4.2% hydrogen peroxide based on the dry weight of the wood chips.
- the preferred method of practicing the present invention with the three-step impregnation sequence of Example 2 consumed only 3.7% hydrogen peroxide based on the dry weight of the wood chips and achieved the highest brightness of 75% Elrepho.
- Pulp produced from Southern Pine chips using the preferred three-stage sequence in Example 3 was compared with pulp produced by a high sulfonation CMP process (Example B) and pulp produced by a low sulfonation CTMP process (Example C) and utilizing commercial scale equipment.
- the liquor used in the impregnation stage contained 58 grams/liter S0 2 (achieved with a mixture of sodium sulfite and sodium bisulfite) and had a pH of 7.4. A sufficient amount of solution was retained in the chips after impregnation to result in 6.3% S0 2 applied to the chips in the Impressafiner. After impregnating the chips, the chips were cooked in a digester with a 4:1 liquor to wood ratio at 160°C for 30 minutes and then the chips were drained of cooking liquor. The cooking liquor contained 59 grams/liter S0 2 (achieved with a sodium sulfite and sodium bisulfite mixture) and had a pH of 7.4.
- Example B The pulp of Example B was tested for brightness, both before (initial) and after bleaching (bleached), freeness and breaking length and the results are given in Table 11. The amount of energy consumed during refining is also given in Table 11.
- the preferred three-stage impregnation process of the present invention was compared with CMP pulp subjected to post refining peroxide bleaching and compared with high alkalinity CTMP pulp subjected to post refining peroxide bleaching in order to substantiate the improved process of the present invention and its applicability to a difficult-to-pulp hardwood species (e.g., Eucalyptus Regnans).
- a difficult-to-pulp hardwood species e.g., Eucalyptus Regnans.
- Example 5 was repeated using Eucalyptus Regnans chips and with the impregnating solutions given below.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Abstract
Claims (39)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US77845785A | 1985-09-20 | 1985-09-20 | |
US778457 | 1985-09-20 |
Publications (4)
Publication Number | Publication Date |
---|---|
EP0239583A1 EP0239583A1 (fr) | 1987-10-07 |
EP0239583A4 EP0239583A4 (fr) | 1988-03-22 |
EP0239583B1 true EP0239583B1 (fr) | 1991-01-02 |
EP0239583B2 EP0239583B2 (fr) | 1994-01-12 |
Family
ID=25113415
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19860905113 Expired - Lifetime EP0239583B2 (fr) | 1985-09-20 | 1986-08-13 | Procede de pre-traitement d'une pulpe avec des stabilisateurs et du peroxyde avant le raffinage mecanique |
Country Status (10)
Country | Link |
---|---|
EP (1) | EP0239583B2 (fr) |
AR (1) | AR243622A1 (fr) |
AU (3) | AU605745B2 (fr) |
BR (1) | BR8606875A (fr) |
CA (1) | CA1274657A (fr) |
DE (1) | DE3676490D1 (fr) |
ES (1) | ES2002755A6 (fr) |
MX (1) | MX174399B (fr) |
PT (1) | PT83406B (fr) |
WO (1) | WO1987001746A1 (fr) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE458690B (sv) * | 1986-11-06 | 1989-04-24 | Sunds Defibrator | Saett att framstaella mekanisk massa fraan lignocellulosahaltigt material i styckeform med en laengd i fiberriktningen av minst 200 mm |
CA2057231A1 (fr) * | 1991-01-07 | 1992-07-08 | Ulrike Tschirner | Methode pour le pretraitement de matieres lignocellulosiques avant le depulpage alkalin a haut rendement au peroxyde |
FR2672315B1 (fr) * | 1991-01-31 | 1996-06-07 | Hoechst France | Nouveau procede de raffinage de la pate a papier. |
CA2631545C (fr) * | 2005-12-02 | 2014-08-19 | Akzo Nobel N.V. | Procede de production de pate a haut rendement |
US8268122B2 (en) | 2005-12-02 | 2012-09-18 | Akzo Nobel N.V. | Process of producing high-yield pulp |
US9273270B2 (en) | 2014-02-20 | 2016-03-01 | Church & Dwight Co., Inc. | Unit dose cleaning products for delivering a peroxide-containing bleaching agent |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE496197C (de) * | 1928-05-15 | 1930-04-17 | Carl G Schwalbe Dr | Verfahren zur Herstellung von Zellstoff aus verholzten Fasern |
CA895757A (en) * | 1970-04-03 | 1972-03-21 | E. Worster Hans | Single-stage soda-oxygen pulping |
US4187141A (en) * | 1975-02-24 | 1980-02-05 | Alf Societe Anonyme | Method of producing bleached mechanical pulp |
SE436368B (sv) * | 1979-01-12 | 1984-12-03 | Sunds Defibrator | Sett att framstella blekta, mekaniska, kemimekaniska och halvkemiska massor av lignocellulosahaltiga fibermaterial |
JPS63402A (ja) * | 1986-06-18 | 1988-01-05 | Toyota Motor Corp | 焼結鍛造用原料粉末およびその粉末を使用した焼結鍛造法 |
-
1986
- 1986-08-13 AU AU62253/86A patent/AU605745B2/en not_active Ceased
- 1986-08-13 EP EP19860905113 patent/EP0239583B2/fr not_active Expired - Lifetime
- 1986-08-13 DE DE8686905113T patent/DE3676490D1/de not_active Expired - Lifetime
- 1986-08-13 BR BR8606875A patent/BR8606875A/pt not_active IP Right Cessation
- 1986-08-13 WO PCT/US1986/001659 patent/WO1987001746A1/fr active IP Right Grant
- 1986-09-18 CA CA000518592A patent/CA1274657A/fr not_active Expired
- 1986-09-19 AR AR30530786A patent/AR243622A1/es active
- 1986-09-19 PT PT8340686A patent/PT83406B/pt not_active IP Right Cessation
- 1986-09-19 MX MX377486A patent/MX174399B/es unknown
- 1986-09-19 ES ES8602010A patent/ES2002755A6/es not_active Expired
-
1990
- 1990-11-14 AU AU66582/90A patent/AU6658290A/en not_active Abandoned
-
1993
- 1993-05-26 AU AU39844/93A patent/AU663781B2/en not_active Ceased
Also Published As
Publication number | Publication date |
---|---|
AU6658290A (en) | 1991-01-31 |
EP0239583A1 (fr) | 1987-10-07 |
PT83406A (en) | 1986-10-01 |
AU6225386A (en) | 1987-04-07 |
EP0239583A4 (fr) | 1988-03-22 |
ES2002755A6 (es) | 1988-10-01 |
AR243622A1 (es) | 1993-08-31 |
PT83406B (pt) | 1989-05-12 |
AU663781B2 (en) | 1995-10-19 |
BR8606875A (pt) | 1987-11-03 |
WO1987001746A1 (fr) | 1987-03-26 |
AU605745B2 (en) | 1991-01-24 |
CA1274657A (fr) | 1990-10-02 |
MX174399B (es) | 1994-05-13 |
EP0239583B2 (fr) | 1994-01-12 |
DE3676490D1 (de) | 1991-02-07 |
AU3984493A (en) | 1993-08-19 |
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