EP2443280A1 - Alkaline peroxide treatment of rejects in an integrated neutral-alkaline paper mill - Google Patents
Alkaline peroxide treatment of rejects in an integrated neutral-alkaline paper millInfo
- Publication number
- EP2443280A1 EP2443280A1 EP10789951A EP10789951A EP2443280A1 EP 2443280 A1 EP2443280 A1 EP 2443280A1 EP 10789951 A EP10789951 A EP 10789951A EP 10789951 A EP10789951 A EP 10789951A EP 2443280 A1 EP2443280 A1 EP 2443280A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rejects
- alkaline
- fiber
- alkali
- hydrogen 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.)
- Granted
Links
- 238000011282 treatment Methods 0.000 title claims description 20
- 150000002978 peroxides Chemical class 0.000 title description 30
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 58
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 48
- 238000000034 method Methods 0.000 claims abstract description 48
- 239000000835 fiber Substances 0.000 claims abstract description 39
- 230000008569 process Effects 0.000 claims abstract description 39
- 238000007670 refining Methods 0.000 claims abstract description 24
- 239000003513 alkali Substances 0.000 claims abstract description 18
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 45
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 10
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 10
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 8
- -1 polyaspartates Chemical class 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 5
- 150000007513 acids Chemical class 0.000 claims description 5
- 229940088417 precipitated calcium carbonate Drugs 0.000 claims description 5
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 5
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 4
- 239000013522 chelant Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 229910021645 metal ion Inorganic materials 0.000 claims description 3
- OCUCCJIRFHNWBP-IYEMJOQQSA-L Copper gluconate Chemical class [Cu+2].OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C([O-])=O.OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C([O-])=O OCUCCJIRFHNWBP-IYEMJOQQSA-L 0.000 claims description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 2
- 150000001860 citric acid derivatives Chemical class 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 150000003009 phosphonic acids Chemical class 0.000 claims description 2
- 229920000058 polyacrylate Polymers 0.000 claims description 2
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 2
- 239000011122 softwood Substances 0.000 claims description 2
- 239000006172 buffering agent Substances 0.000 claims 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 claims 1
- 238000005194 fractionation Methods 0.000 claims 1
- 239000011121 hardwood Substances 0.000 claims 1
- 238000012216 screening Methods 0.000 claims 1
- 239000011593 sulfur Substances 0.000 claims 1
- 229910052717 sulfur Inorganic materials 0.000 claims 1
- 238000004061 bleaching Methods 0.000 abstract description 17
- 230000000704 physical effect Effects 0.000 abstract description 7
- 230000003287 optical effect Effects 0.000 abstract description 6
- 239000003381 stabilizer Substances 0.000 abstract description 4
- 238000004537 pulping Methods 0.000 description 20
- 235000011121 sodium hydroxide Nutrition 0.000 description 14
- 239000000126 substance Substances 0.000 description 13
- 238000005282 brightening Methods 0.000 description 12
- 239000003518 caustics Substances 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 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 description 9
- 229960003330 pentetic acid Drugs 0.000 description 9
- 238000010790 dilution Methods 0.000 description 8
- 239000012895 dilution Substances 0.000 description 8
- 239000002023 wood Substances 0.000 description 7
- 239000007844 bleaching agent Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 230000006872 improvement Effects 0.000 description 6
- 239000002738 chelating agent Substances 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 5
- 229920005610 lignin Polymers 0.000 description 5
- 230000014759 maintenance of location Effects 0.000 description 5
- JVBXVOWTABLYPX-UHFFFAOYSA-L sodium dithionite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])=O JVBXVOWTABLYPX-UHFFFAOYSA-L 0.000 description 5
- 239000004115 Sodium Silicate Substances 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 4
- 229910052911 sodium silicate Inorganic materials 0.000 description 4
- 239000000872 buffer Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 2
- 229940120146 EDTMP Drugs 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- YDONNITUKPKTIG-UHFFFAOYSA-N [Nitrilotris(methylene)]trisphosphonic acid Chemical compound OP(O)(=O)CN(CP(O)(O)=O)CP(O)(O)=O YDONNITUKPKTIG-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 229940090960 diethylenetriamine pentamethylene phosphonic acid Drugs 0.000 description 2
- DUYCTCQXNHFCSJ-UHFFFAOYSA-N dtpmp Chemical compound OP(=O)(O)CN(CP(O)(O)=O)CCN(CP(O)(=O)O)CCN(CP(O)(O)=O)CP(O)(O)=O DUYCTCQXNHFCSJ-UHFFFAOYSA-N 0.000 description 2
- NFDRPXJGHKJRLJ-UHFFFAOYSA-N edtmp Chemical compound OP(O)(=O)CN(CP(O)(O)=O)CCN(CP(O)(O)=O)CP(O)(O)=O NFDRPXJGHKJRLJ-UHFFFAOYSA-N 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
- 241000894007 species Species 0.000 description 2
- 229920003043 Cellulose fiber Polymers 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- NGWKGSCSHDHHAJ-YPFQVHCOSA-N Liquoric acid Chemical compound C1C[C@H](O)C(C)(C)C2CC[C@@]3(C)[C@]4(C)C[C@H]5O[C@@H]([C@](C6)(C)C(O)=O)C[C@@]5(C)[C@@H]6C4=CC(=O)C3[C@]21C NGWKGSCSHDHHAJ-YPFQVHCOSA-N 0.000 description 1
- 235000008124 Picea excelsa Nutrition 0.000 description 1
- 240000000020 Picea glauca Species 0.000 description 1
- 235000008127 Picea glauca Nutrition 0.000 description 1
- 241000218606 Pinus contorta Species 0.000 description 1
- 235000005018 Pinus echinata Nutrition 0.000 description 1
- 241001236219 Pinus echinata Species 0.000 description 1
- 235000017339 Pinus palustris Nutrition 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 206010061592 cardiac fibrillation Diseases 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- GRWZHXKQBITJKP-UHFFFAOYSA-L dithionite(2-) Chemical compound [O-]S(=O)S([O-])=O GRWZHXKQBITJKP-UHFFFAOYSA-L 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 230000002600 fibrillogenic effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000012978 lignocellulosic material Substances 0.000 description 1
- 235000014684 lodgepole pine Nutrition 0.000 description 1
- 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 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- MGFYIUFZLHCRTH-UHFFFAOYSA-N nitrilotriacetic acid Chemical compound OC(=O)CN(CC(O)=O)CC(O)=O MGFYIUFZLHCRTH-UHFFFAOYSA-N 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 239000012783 reinforcing fiber Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 235000000673 shore pine Nutrition 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 150000003464 sulfur compounds Chemical class 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 230000007306 turnover Effects 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
- D21C9/001—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
- 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
- D21C9/007—Modification of pulp properties by mechanical or physical means
-
- 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
- D21C9/16—Bleaching ; Apparatus therefor with per compounds
- D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides
Definitions
- the present invention is directed to processes producing mechanical pulps utilizing refiners for improving the quality of screen rejects, and most particularly to a mechanical pulp mill integrated with a neutral-alkaline papermaking process producing mechanical printing paper grades.
- the rejects are treated with hydrogen peroxide, an alkali and an organic stabilizing agent to provide improved optical and physical properties of the refined rejects.
- Mechanical pulping is a process of mechanically triturating wood into its fibers for the purpose of making pulp.
- a key advantage of mechanical pulping is the high yield compared to chemical pulping which removes most or all of the lignin binding the cellulose fibers. Lignin is not removed from mechanically pulped wood, meaning scarce resources are more efficiently utilized.
- Pulps made using conventional mechanical pulping methods are mainly used for newsprint and other printing papers destined for direct mail advertising, directories and some magazines and books, and are typically unsuitable for higher quality or more durable paper end products. This is due, in part, to the fact that mechanical pulps are generally more difficult to bleach, can revert in terms of brightness due to light and humidity exposure and typically have lower strength than chemical pulps.
- the TMP process typically consists of two refining stages.
- the first stage is pressurized, which allows the capture of thermal energy released as steam when mechanical energy is applied to the wood chips between the rotating refiner discs. Control of the steam pressure allows the primary refiner to operate at elevated temperatures and provides steam to heat and moisturize the wood chips before refining.
- the second stage refiner may be atmospheric, but it is more common to pressurize that stage also in order to capture more energy and better control the process. Pulps made by the TMP and CTMP processes have higher strength, which makes them the more favored mechanical pulping processes. However, there is still potential for improvement.
- the TMP process consumes a high quantity of electrical energy and the pulp produced by the TMP process tends to be darker than most other pulps due to thermal darkening of fiber during refining. Furthermore, the presence of large quantities of lignin in the refined fiber makes it highly susceptible to alkaline darkening.
- alkaline peroxide treatment of mechanical pulp rejects has been shown to produce improved physical properties and higher brightness equal to or superior to those of sulphonation.
- efficient alkaline peroxide treatments have been described as requiring a treatment time of from five to forty minutes or more to provide maximum improvements. See for example " HIGH ALKALINE PEROXIDE TREATMENT OF WHITE SPRUCE/LODGEPOLE PINE RMP REJECTS', S.G. Book, ppl-17, CPPA Pacific Coast Brach Mini- Conference April 1990 and "ALKALINE PEROXIDE TREATMENT OF SOUTHERN PINE TMP REJECTS", MJ. Sferrazza et al., pp 617- 629, 1988 Pulping Conference. In the described processes, 4.4-8.9% by weight NaOH based on fiber was being utilized to treat rejects in order to achieve the physical strength improvements noted and caustic/ peroxide (C/P) ratios of 2-3 : 1 were utilized.
- C/P caustic/ peroxide
- US Patent Publication No. 2009/0032207 discloses a mechanical or chem. -mechanical process for making pulp in which, after fibrillation, the pulp is bleached in alkaline conditions. Thereafter, the rejects are screened and bleached separately from the accepts and the bleached rejects mixed with the accepts.
- US Patent Publication 2008/0035286 discloses an alkaline peroxide mechanical pulping process which includes a step of treating fiberized lignocellulosic material with alkali peroxide chemical for a time and under conditions sufficient to obtain a pulp of desired consistency.
- Bleaching is a term associated with a pulping process whereby certain chemicals are well mixed with fiber and then retained on the fiber for a given amount of time to increase the pulp's brightness. Bleaching is practiced on chemical and mechanical fiber pulps. In mechanical pulping, the increase in brightness is achieved by altering the chemical structure of the conjugated double bonds in lignin. The conjugated double-bonded species are called chromophores. "Brightening” is the term often used when referring to bleaching of mechanical pulps to distinguish it from the bleaching process of chemical pulps, which differs by the removal all lignin. As used hereinafter “bleaching" will be intended to cover the process of "brightening" as well.
- Brightening is often carried out in a single step in the pulping process.
- the bleaching process is conventionally carried out in a bleaching train in one or a plurality of vessels (bleach towers or stages) in a distinct section of the mill, as opposed to the pulping section of the mill.
- Brightening can be carried out using oxidizing agents such as hydrogen peroxide and/or reducing agents such as sodium dithionite or sodium hydrosulfite.
- hydrogen peroxide an oxidizing agent
- sodium hydroxide is a strong alkali and provides the requisite high pH necessary to produce the active perhydroxyl ion, HOO " , thought to produce the bleaching effect in pulps.
- the cost of sodium hydroxide has been increasing due to changes in availability and energy costs. Concern over the environment has also meant a decrease in the available sodium hydroxide supply. Therefore, different alkali sources and different methods have been tried to find suitable alternatives for bleaching liquors and bleaching processes with limited commercial success.
- sodium silicate and one of various organic and inorganic stabilizing agents are typically applied to fiber during and prior to addition of hydrogen peroxide and alkali on the fiber.
- These materials are beneficial largely due to their ability to control metal ions such as manganese, iron and copper that are contained in wood chips entering the pulping process. If untreated, these metal ions destroy hydrogen peroxide and perhydroxyl ion before it is able to brighten chromophores, making the process must less cost efficient and lowering brightening performance.
- the present invention specifically excludes the use of sodium silicate for stabilization of peroxide and perhydroxyl ion.
- the presence of silicates can result in the formation of scales (eg. calcium silicate, sodium carbonate) such as on refiner plates which can limit the ability of the refiner to refine rejects.
- scales eg. calcium silicate, sodium carbonate
- Figure 1 is a bar graph of ISO Brightness of Refined Screen Rejects based upon Example 1.
- Figure 2 is a graph of ISO Brightness of Refined Screen Rejects versus % Peroxide based upon Example 1.
- Figure 3 is graph of Bulk of Refined Screen Rejects versus Caustic based upon Example 1.
- Figure 4 is a graph of ISO Brightness versus Applied Peroxide in bleaching TMP Screened Stock based upon Example 1.
- Figure 5 is a graph of the % bulk decrease and % tensile strength increase compared to baseline from APTR at increasing C/P of Rejects Screen Accepts based upon Example 2.
- Figure 6 is a graph of the %Long Fiber due to APTR at increasing C/P of Rejects Screen Accepts and TMP Screened Stock based upon Example 2.
- Figure 7 is a graph of the %bulk decrease and % strength increase compared to baseline from APTR at increasing C/P of TMP Screened Stock based upon Example
- Figure 8 is a graph of brightness measured on stock at various points through the TMP mill before, during and after a 7-day APTR trial at a 1.0 C/P based upon Example 2.
- Figure 9 is a graph of total specific energy in rejects refining versus final rejects freeness with compared to without APTR after a 7-day APTR trial at a 1.0 C/P based upon Example 2.
- Figure 10 is a graph of wet-end breaks by day for all downstream paper machines before, during and after a 7-day APTR trial at a 1.0 C/P based upon Example 2.
- Figure 11 is a graph of key pulp properties from pulp sampled at the Rejects Refiner Discharge after applying a moderate hydrogen peroxide dosage based upon Example 3.
- Figure 12 is a graph of key pulp properties from pulp sampled at the Rejects Refiner Discharge after applying a higher hydrogen peroxide dosage based upon Example 3.
- the present invention is directed to an improved process for the treatment of mechanical pulping rejects fiber wherein an alkaline hydrogen peroxide treatment is employed that does not require retention time on fiber prior to high consistency refining and which is effective at low chemical treatment levels.
- the use of zero retention time when adding alkaline treatment chemicals to thickened rejects prior to refining was found to be effective at caustic addition rates of less than or equal to 3.5% by weight in paper mills which operate at least one integrated neutral-alkaline papermaking machine and recycle water from this back to the mechanical pulp mill.
- percentages are by weight unless specifically specified otherwise. Elimination of the requirement for retention of alkaline peroxide on rejects fiber prior to refining allows the present invention to be implimented with minimal capital cost.
- Recycle of neutral-alkaline paper machine white water to the mechanical pulp mill and the buffering associated with it from precipitated calcium carbonate (PCC) or ground calcium carbonate (GCC) filler pigment minimizes operating chemical costs by reducing the alkali demand of the mechanical fiber. This results in lower addition of total alkali on the rejects.
- the amount of hydrogen peroxide added when alkaline treating rejects is related to caustic additon so lower caustic requirements result in lower hydrogen peroxide requirements and makes the process more cost-effective.
- C/P caustic to peroxide ratio
- ATR alkaline peroxide treatment of rejects
- alkali is meant to include any source of alkalinity such as sodium hydroxide or caustic soda (NaOH), sodium carbonate (Na 2 CO 3 ) and sodium bicarbonate (NaHCO 3 ).
- Na 2 CO 3 and NaHCO 3 also provide buffer capacity to prevent wide swings in pH. When alkaline peroxide bleaching at high temperatures, better brightness is obtained with buffered systems. Buffering the system at lower pH (preferably between about 9 to about 10.5) prevents peroxide decomposition and darkening, but still provides adequate alkalinity to produce the desired species. The buffer releases alkalinity as necessary, and provides sufficient alkalinity for a slow and even production of the perhydroxyl ions.
- the calcium carbonate functions as a buffer and would be expected to improve brightening during APTR that occurs in a high temperature refiner.
- the components of the APTR liquor may be added separately or concurrently, concurrently meaning two or more components together such as a pre-mixed stream and separately meaning one at a time, as in individual streams.
- a hydrogen peroxide stabilizer such as a suitable chelating agent may be included.
- Chelating agents can include, but are not limited to aminopolycarboxylic acids, (e.g.) ethylenediaminetetraacetic acid (EDTA), diethylene triamine pentaacetic acid (DTPA), nitrilotriacetic acid (NTA), phosphonic acids, (e.g.) ethylenediaminetetramethylene-phosphonic acid (EDTMP), diethylenetriaminepentamethylenephosphonic acid (DTPMP), nitrilotrimethylenephosphonic acid (NTMP), polycarboxylic acids, gluconates, citrates, polyacrylates, and polyaspartates or any combination thereof.
- aminopolycarboxylic acids e.g.) ethylenediaminetetraacetic acid (EDTA), diethylene triamine pentaacetic acid (DTPA), nitrilotriacetic acid (NTA), phosphonic acids, (e.g.)
- a chelating agent may be added to the bleaching liquor in an amount up to 0.5% by weight based on fiber but is preferably added at addition rates of from about 0.1-0.25% based on fiber.
- chelating agents may be added separately or concurrently with one or more bleach liquor components at one or more chemical addition points in the refining system. Chelating agents are thought to bind metals to prevent the decomposition of hydrogen peroxide which can cause darkening of the produced paper.
- neutral-alkaline it is meant a pH of about 7.0 to 7.5. Additionally, it was found that neutral-alkaline Whitewater containing significant amounts of non-oxidized sulfur compounds leads to brightness gains during APTR that are lower than those where the neutral-alkaline Whitewater does not contain these impurities.
- Figures 1-4 summarize the relationships observed after APTR on fiber from laboratory-prepared handsheets made from Refined Screen Rejects and brightened TMP Screened Stock samples.
- Trials were conducted at an integrated neutral-alkaline mechanical printing paper mill producing a range of paper grades having brightness specifications of 58-84% ISO and printing opacity specification of 85-97%. During extended operating periods of 12 hours and separately, 7 days, APTR was evaluated by applying a liquor containing dilution water, DTPA, caustic soda and hydrogen peroxide onto feedstock for two rejects refiners operating in parallel.
- the 12-hour evaluations allowed: a) comparing results from two different addition points around the refiners, b) evaluating a low (0.6) and a medium (1.0) C/P ratio at a constant hydrogen peroxide addition of 30 kg/BDt to determine effects on fiber quality at various locations in the TMP mill that the rejects refiners were operating in and c) determining how rejects refining specific energy was impacted by APTR.
- the 7 day and 24 hour per day evaluation were at a 1.0 C/P with addition of 30 kg/BDt peroxide on rejects and a) allowed paper machine Whitewater coming back to the TMP mill to completely turn over, b) evaluated downstream effects of APTR in bleaching of TMP on the paper machines on various paper grades and c) provided data showing specific energy reduction in rejects refining.
- Table 2 summarizes laboratory data of accepts samples collected during a single week of primary, secondary and rejects screens when two APTR operating periods of 12 hours each in duration could be compared to three operating periods surrounding them when APTR was not operating.
- Figures 5-7 illustrates the key benefits of APTR in the TMP mill during the 12 hour trials while Figures 8-10 summarize key results of continuous automated testing in the TMP mill and at the three downstream paper machines over the extended 7 day trial.
- Trials were conducted at an integrated neutral-alkaline mechanical printing paper mill producing a limited number of paper grades having brightness specifications of 58- 60% ISO and printing opacity specification of 85-95%.
- APTR was evaluated by applying a liquor containing dilution water, DTPA, caustic soda and hydrogen peroxide into high-pressure dilution feed water added at the refining zone of one or two atmospheric refiners operating in series. These refiners process screened, cleaned TMP rejects that are subsequently bleached separately from additional TMP accepts/rejects with sodium hydrosulfite and utilized as a reinforcing fiber on two downstream paper machines.
- Figures H and 12 illustrate the beneficial effects of APTR on brightness, tensile and other key pulp properties utilizing Cf? ratios in the range of 0.35-0.40 in treatment liquor and DTPA applied into Unrefined Rejects prior to refining.
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US18707309P | 2009-06-15 | 2009-06-15 | |
PCT/US2010/037880 WO2010147812A1 (en) | 2009-06-15 | 2010-06-09 | Alkaline peroxide treatment of rejects in an integrated neutral-alkaline paper mill |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2443280A1 true EP2443280A1 (en) | 2012-04-25 |
EP2443280A4 EP2443280A4 (en) | 2014-08-13 |
EP2443280B1 EP2443280B1 (en) | 2020-12-09 |
Family
ID=43356689
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Application Number | Title | Priority Date | Filing Date |
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EP10789951.0A Active EP2443280B1 (en) | 2009-06-15 | 2010-06-09 | Alkaline peroxide treatment of rejects in an integrated neutral-alkaline paper mill |
Country Status (5)
Country | Link |
---|---|
US (1) | US20120097350A1 (en) |
EP (1) | EP2443280B1 (en) |
CN (1) | CN102459753A (en) |
RU (1) | RU2495177C2 (en) |
WO (1) | WO2010147812A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN102776795B (en) * | 2012-08-03 | 2014-06-04 | 常州市春江化学有限公司 | Application of organic phosphonic acid in pulp bleaching process |
CA2824076A1 (en) | 2012-08-21 | 2014-02-21 | University Of New Brunswick | System and method for reclaiming rejects in sulfite pulping |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0153717A2 (en) * | 1984-02-22 | 1985-09-04 | Mo Och Domsjö Aktiebolag | A method for producing improved high-yield pulps |
WO1997022749A1 (en) * | 1995-12-19 | 1997-06-26 | Kvaerner Hymac Inc. | Process for treating refiner pulp |
WO1999054544A1 (en) * | 1998-04-17 | 1999-10-28 | Alberta Research Council Inc. | Method of producing lignocellulosic pulp from non-woody species |
US20040112557A1 (en) * | 2001-05-16 | 2004-06-17 | Weyerhaeuser Company | Refiner bleaching with magnesium oxide and hydrogen peroxide |
WO2005121447A1 (en) * | 2004-06-11 | 2005-12-22 | Imerys Minerals Limited | Treatment of pulp |
WO2006128950A1 (en) * | 2005-05-03 | 2006-12-07 | M-Real Oyj | Process for producing mechanical pulp suitable for paper or cardboard making |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
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US4614646A (en) * | 1984-12-24 | 1986-09-30 | The Dow Chemical Company | Stabilization of peroxide systems in the presence of alkaline earth metal ions |
AUPM452794A0 (en) * | 1994-03-17 | 1994-04-14 | Amcor Limited | Waste water recovery system |
CN1213197C (en) * | 1999-02-15 | 2005-08-03 | 柯兰姆有限公司 | Process for oxygen pulping of lignocellulosic material and recovery of pulping chemicals |
US6743332B2 (en) * | 2001-05-16 | 2004-06-01 | Weyerhaeuser Company | High temperature peroxide bleaching of mechanical pulps |
RU2322504C1 (en) * | 2006-06-26 | 2008-04-20 | Институт биоорганической химии им. академиков М.М. Шемякина и Ю.А. Овчинникова Российской академии наук | Method for preparing genetic-engineering human insulin |
US8262851B2 (en) | 2006-08-10 | 2012-09-11 | Andritz Inc. | Processes and systems for the pulping of lignocellulosic materials |
US20090114352A1 (en) * | 2006-08-25 | 2009-05-07 | Rossi Robert A | Process and system for calcination of high solids kraft paper pulp mill lime mud |
-
2010
- 2010-06-09 WO PCT/US2010/037880 patent/WO2010147812A1/en active Application Filing
- 2010-06-09 EP EP10789951.0A patent/EP2443280B1/en active Active
- 2010-06-09 US US13/264,206 patent/US20120097350A1/en not_active Abandoned
- 2010-06-09 CN CN2010800264508A patent/CN102459753A/en active Pending
- 2010-06-09 RU RU2011142599/12A patent/RU2495177C2/en active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0153717A2 (en) * | 1984-02-22 | 1985-09-04 | Mo Och Domsjö Aktiebolag | A method for producing improved high-yield pulps |
WO1997022749A1 (en) * | 1995-12-19 | 1997-06-26 | Kvaerner Hymac Inc. | Process for treating refiner pulp |
WO1999054544A1 (en) * | 1998-04-17 | 1999-10-28 | Alberta Research Council Inc. | Method of producing lignocellulosic pulp from non-woody species |
US20040112557A1 (en) * | 2001-05-16 | 2004-06-17 | Weyerhaeuser Company | Refiner bleaching with magnesium oxide and hydrogen peroxide |
WO2005121447A1 (en) * | 2004-06-11 | 2005-12-22 | Imerys Minerals Limited | Treatment of pulp |
WO2006128950A1 (en) * | 2005-05-03 | 2006-12-07 | M-Real Oyj | Process for producing mechanical pulp suitable for paper or cardboard making |
Non-Patent Citations (1)
Title |
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See also references of WO2010147812A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20120097350A1 (en) | 2012-04-26 |
EP2443280A4 (en) | 2014-08-13 |
WO2010147812A1 (en) | 2010-12-23 |
RU2495177C2 (en) | 2013-10-10 |
CN102459753A (en) | 2012-05-16 |
EP2443280B1 (en) | 2020-12-09 |
RU2011142599A (en) | 2013-04-27 |
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