CA2569848A1 - Pulp bleaching processes - Google Patents
Pulp bleaching processesInfo
- Publication number
- CA2569848A1 CA2569848A1 CA002569848A CA2569848A CA2569848A1 CA 2569848 A1 CA2569848 A1 CA 2569848A1 CA 002569848 A CA002569848 A CA 002569848A CA 2569848 A CA2569848 A CA 2569848A CA 2569848 A1 CA2569848 A1 CA 2569848A1
- Authority
- CA
- Canada
- Prior art keywords
- pulp
- light
- bleaching process
- bleaching
- treatment
- 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 25
- 238000004076 pulp bleaching Methods 0.000 title claims 14
- 238000004061 bleaching Methods 0.000 claims abstract 17
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract 13
- 238000010306 acid treatment Methods 0.000 claims abstract 8
- 239000002253 acid Substances 0.000 claims abstract 4
- 239000003638 chemical reducing agent Substances 0.000 claims abstract 3
- 150000001875 compounds Chemical class 0.000 claims abstract 3
- 150000002978 peroxides Chemical class 0.000 claims abstract 3
- 230000001678 irradiating effect Effects 0.000 claims abstract 2
- 150000002894 organic compounds Chemical class 0.000 claims abstract 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims 7
- 239000000123 paper Substances 0.000 claims 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims 2
- 238000005562 fading Methods 0.000 claims 2
- 239000007789 gas Substances 0.000 claims 2
- 238000009897 hydrogen peroxide bleaching Methods 0.000 claims 2
- 238000004519 manufacturing process Methods 0.000 claims 2
- 239000000203 mixture Substances 0.000 claims 2
- 239000001301 oxygen Substances 0.000 claims 2
- 229910052760 oxygen Inorganic materials 0.000 claims 2
- 239000013055 pulp slurry Substances 0.000 claims 2
- 229910052724 xenon Inorganic materials 0.000 claims 2
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 claims 2
- 230000002378 acidificating effect Effects 0.000 claims 1
- 238000002347 injection Methods 0.000 claims 1
- 239000007924 injection Substances 0.000 claims 1
- 239000007800 oxidant agent Substances 0.000 claims 1
- 239000011087 paperboard Substances 0.000 claims 1
- 238000010998 test method Methods 0.000 claims 1
- 238000002845 discoloration Methods 0.000 abstract 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 abstract 1
- 229910052801 chlorine Inorganic materials 0.000 abstract 1
- 239000000460 chlorine Substances 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000000126 substance Substances 0.000 abstract 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
-
- 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
- D21C9/1084—Bleaching ; Apparatus therefor with reducing 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
- D21C9/10—Bleaching ; Apparatus therefor
- D21C9/16—Bleaching ; Apparatus therefor with per compounds
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Abstract
A method for bleaching a pulp, which comprises irradiating an acid-treated and washed pulp with an ultraviolet and/or visible light having a wavelength of 100 to 400 nm under an alkaline condition, preferably at a pH in the range of 10 to 13; the bleaching method, wherein the acid treating is carried out under the condition of a pH of 1 to 6 and a temperature of 80~C or higher; and the bleaching method, wherein the light is irradiated in the presence of at least one compound selected from the group of a reducing agent, a peroxide and a hydrogen-donating organic compound; and a highly white chemical pulp which has a ISO whiteness of 88 % or higher and exhibits a decreasing rate for the whiteness in a prescribed discoloration test of 1.0 % or less. The above bleaching method is a technology having been attained by further developing a conventional acid treatment or light irradiation of a pulp, and it reduces the use of a chlorine-containing chemical and is markedly efficient and more efficient as compared to a conventional technology. The above pulp is reduced in the load on the environment, is free from discoloration, and is an excellent pulp having high whiteness.
Claims (25)
- [1] A pulp bleaching process characterized in that a pulp washed after an acid treatment is irradiated with UV light and/or visible light at a wavelength of 100 - 400 nm under alkaline conditions.
- [2] The pulp bleaching process of claim 1 characterized in that the alkaline conditions comprise a pH range of 10 - 13.
- [3] The pulp bleaching process of claim 1 or 2 characterized in that the acid treatment is performed under conditions of pH 1 - 6 and a temperature of 80°C or more.
- [4] The pulp bleaching process of claim 1 or 2 characterized in that the acid treatment is performed in the presence of ozone under conditions of pH 1.0 - 8.0 and a temperature of 25 - 95°C.
- [5] The pulp bleaching process of any one of claims 1 to 4 characterized in that the irradiation treatment is performed in the presence of at least one compound selected from the group consisting of reducing agents, peroxides, and hydrogen--donating organic compounds.
- [6] The pulp bleaching process of any one of claims 1 to 5 characterized in that the irradiation source of the UV light and/or visible light consists of multiple light sources having different wavelength characteristics.
- [7] The pulp bleaching process of any one of claims 1 to 6 characterized in that the irradiation treatment is repeated multiple times.
- [8] A pulp bleaching process characterized in that a pulp washed after an acid treatment is irradiated with UV light and/or visible light at a wavelength of 100 - 400 nm in the presence of ozone.
- [9] The pulp bleaching process of claim 8 characterized in that the irradiation treatment with UV light and/or visible light is performed under acidic conditions of pH 2 - 4 or under alkaline conditions of pH 10 - 13.
- [10] The pulp bleaching process of claim 8 or 9 characterized in that the acid treatment is performed under conditions of pH 1 - 6 and a temperature of 80 - 180°C.
- [11] The pulp bleaching process of any one of claims 8 to characterized in that the acid treatment is performed in the presence of ozone under conditions of pH 1 - 8 and a temperature of temperature 25 - 95°C.
- [12] The pulp bleaching process of any one of claims 8 to 11 characterized in that the ozone is generated by irradiating air or oxygen or a mixture thereof with UV light.
- [13] The pulp bleaching process of any one of claims 8 to 12 characterized in that the ozone concentration during the irradiation treatment is 0.5 - 100 ppm.
- [14] A pulp bleacher characterized in that air or oxygen or a mixture thereof is supplied to the surroundings of an irradiation source of UV light and/or visible light to generate ozone and a gas containing the ozone is fed to a pulp.
- [15] A pulp bleacher comprising an ozone-generating chamber having an irradiation source for emitting UV light and/or visible light therein and a pulp slurry chamber, wherein the ozone-generating chamber has a gas injection port and a discharge port, and the discharge port communicates with the pulp slurry chamber.
- [16] A totally chlorine-free (TCF) bleaching process for chemical pulp characterized in that an oxygen-delignified pulp is acid-treated and then bleached by a bleaching process used in totally chlorine-free bleaching, and the resulting pulp is further subjected to a light bleaching treatment with UV light and/or visible light at a wavelength of 100 - 400 nm under alkaline conditions, followed by alkaline hydrogen peroxide bleaching
- [17] A totally chlorine-free bleaching process for chemical pulp characterized in that an oxygen-delignified pulp is acid-treated and then bleached by a bleaching process used in normal TCF bleaching to an ISO brightness of 70 - 75%, and the resulting pulp is further subjected to a light bleaching treatment with UV light and/or visible light at a wavelength of 100 - 400 nm under alkaline conditions to an ISO brightness of 75 - 80%, followed by alkaline hydrogen peroxide bleaching to give a pulp having an ISO brightness of 84% or more.
- [18] The bleaching process for chemical pulp of claim 1 or 2 characterized in that the light bleaching treatment is performed in a pH range of 10 - 13.
- [19] The bleaching process for chemical pulp of any one of claims 16 to 18 characterized in that the acid treatment is performed under conditions of pH 1 - 6 and a temperature of 80°C or more.
- [20] The bleaching process for chemical pulp of any one of claims 16 to 19 characterized in that the light bleaching treatment is performed in the presence of at least one compound selected from the group consisting of oxidizing agents, reducing agents, and peroxides.
- [21] A high brightness chemical pulp having an ISO
brightness of 88% or more and a brightness loss of 1.0% or less in the following fading test: a hand-made paper is prepared according to JIS P 8222 and irradiated with a xenon lamp at an intensity of 67 W/m2 for 30 minutes in an atmosphere at 30°C according to fading test method B of J.
TAPPI No.21 Paper and Paperboard (using a xenon arc lamp light fastness tester) and then the ISO brightness is measured and a loss from the ISO brightness before treatment is determined. - [22] The high brightness chemical pulp of claim 21, which has been treated with UV light and/or visible light and has an ISO brightness of 88% or more.
- [23] A paper containing the high brightness chemical pulp of claim 21 or 22.
- [24] A process for preparing a high brightness chemical pulp characterized in that a bleached chemical pulp is treated with UV light and/or visible light.
- [25] A process for preparing a high brightness chemical pulp characterized in that a bleached chemical pulp having an ISO brightness of 80% or more is treated with UV light and/or visible light to an ISO brightness of 88% or more.
Applications Claiming Priority (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004169367A JP4603298B2 (en) | 2004-06-08 | 2004-06-08 | Pulp bleaching method |
| JP2004-169367 | 2004-06-08 | ||
| JP2004-289267 | 2004-09-30 | ||
| JP2004289267A JP2006104587A (en) | 2004-09-30 | 2004-09-30 | Highly white-colored chemical pulp and method for producing the same |
| JP2005102558A JP2006283211A (en) | 2005-03-31 | 2005-03-31 | Method for bleaching chemical pulp |
| JP2005-102558 | 2005-03-31 | ||
| JP2005-102615 | 2005-03-31 | ||
| JP2005102615A JP2006283213A (en) | 2005-03-31 | 2005-03-31 | Method and apparatus for bleaching pulp |
| PCT/JP2005/010521 WO2005121442A1 (en) | 2004-06-08 | 2005-06-08 | Method for bleaching pulp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2569848A1 true CA2569848A1 (en) | 2005-12-22 |
| CA2569848C CA2569848C (en) | 2011-05-10 |
Family
ID=35503100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2569848A Expired - Fee Related CA2569848C (en) | 2004-06-08 | 2005-06-08 | Pulp bleaching processes |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20070246176A1 (en) |
| EP (1) | EP1790771A4 (en) |
| CA (1) | CA2569848C (en) |
| WO (1) | WO2005121442A1 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7914646B2 (en) | 2006-07-21 | 2011-03-29 | Nalco Company | Compositions and processes for paper production |
| AU2007316938B2 (en) * | 2006-11-09 | 2011-10-06 | Oci Nitrogen B.V. | Process for the preparation of a panel |
| FR2910027B1 (en) * | 2006-12-13 | 2009-11-06 | Itt Mfg Enterprises Inc | PROCESS FOR WHITENING CHEMICAL STRIPPING PASTES BY FINAL OZONE TREATMENT AT HIGH TEMPERATURE |
| US7867358B2 (en) * | 2008-04-30 | 2011-01-11 | Xyleco, Inc. | Paper products and methods and systems for manufacturing such products |
| US7867359B2 (en) | 2008-04-30 | 2011-01-11 | Xyleco, Inc. | Functionalizing cellulosic and lignocellulosic materials |
| ES2456271T3 (en) | 2008-06-20 | 2014-04-21 | International Paper Company | Composition and registration sheet with improved optical properties |
| JP5938979B2 (en) * | 2012-03-23 | 2016-06-22 | 日本製紙株式会社 | Treatment method of plant-based materials |
| CN104372704A (en) * | 2014-09-15 | 2015-02-25 | 岳阳林纸股份有限公司 | Chemical-mechanical pulp H2O2+OBA relay axurilary bleaching method |
| US10143993B2 (en) * | 2015-08-18 | 2018-12-04 | Lam Research Corporation | Radical generator and method for generating ammonia radicals |
| JP6992760B2 (en) * | 2016-09-30 | 2022-01-13 | 王子ホールディングス株式会社 | Pulp, slurry, sheet, laminate and pulp manufacturing method |
| CN115110329A (en) * | 2022-06-28 | 2022-09-27 | 中国制浆造纸研究院有限公司 | Method for reducing metal content and ash content in bleaching section pulp |
Family Cites Families (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| UST989185I4 (en) * | 1937-06-01 | |||
| US4294654A (en) * | 1980-03-21 | 1981-10-13 | International Paper Company | Delignification and bleaching of lignocellulosic pulp via photo-oxygenation |
| EP0112377B1 (en) * | 1982-06-24 | 1986-11-12 | Scott Paper Company | Ozone bleaching of cellulosic materials |
| US5084344A (en) * | 1988-02-26 | 1992-01-28 | Mitsubishi Paper Mills Limited | Photographic support comprising a layer containing an electron beam hardened resin and white pigment of a thickness of 5-100 microns |
| WO1994002680A1 (en) * | 1992-07-24 | 1994-02-03 | Kamyr, Inc. | Hydrocyclone photo-reactor |
| JP2593392B2 (en) * | 1992-10-20 | 1997-03-26 | 本州製紙株式会社 | Pulp bleaching method |
| SE470538C (en) * | 1992-12-02 | 1996-01-11 | Kvaerner Pulping Tech | When bleaching pulp, use no chlorine-containing chemicals |
| US6776876B1 (en) * | 1994-10-13 | 2004-08-17 | Andritz Oy | Method of treating cellulosic pulp to remove hexenuronic acid |
| FI105701B (en) * | 1995-10-20 | 2000-09-29 | Ahlstrom Machinery Oy | Method and arrangement for treatment of pulp |
| JPH09241988A (en) * | 1996-03-07 | 1997-09-16 | Mitsubishi Paper Mills Ltd | Ozone bleaching of pulp |
| WO1998011295A1 (en) * | 1996-09-11 | 1998-03-19 | Solvay Interox (Societe Anonyme) | Method for bleaching paper pulp |
| ES2209420T3 (en) * | 1998-04-17 | 2004-06-16 | Alberta Research Council, Inc. | LIGNOCELLULOSIC PULP PRODUCTION METHOD FROM NON-WOOD SPECIES. |
| JP3787612B2 (en) * | 2000-06-20 | 2006-06-21 | 独立行政法人産業技術総合研究所 | Pulp bleaching method |
| JP3371228B2 (en) * | 2000-06-20 | 2003-01-27 | 独立行政法人産業技術総合研究所 | Pulp bleaching method |
| JP3368336B2 (en) * | 2000-06-20 | 2003-01-20 | 独立行政法人産業技術総合研究所 | Pulp bleaching method |
| JP4721308B2 (en) * | 2001-02-06 | 2011-07-13 | 独立行政法人産業技術総合研究所 | Method for bleaching cellulose derivatives |
| JP2003040607A (en) * | 2001-07-31 | 2003-02-13 | Konpurasu Kk | Ozonizer |
| JP2003165711A (en) * | 2001-11-26 | 2003-06-10 | Wakomu Denso:Kk | Ozone generating device |
-
2005
- 2005-06-08 US US11/628,961 patent/US20070246176A1/en not_active Abandoned
- 2005-06-08 WO PCT/JP2005/010521 patent/WO2005121442A1/en active Application Filing
- 2005-06-08 CA CA2569848A patent/CA2569848C/en not_active Expired - Fee Related
- 2005-06-08 EP EP05748560A patent/EP1790771A4/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| EP1790771A4 (en) | 2012-10-03 |
| EP1790771A1 (en) | 2007-05-30 |
| WO2005121442A1 (en) | 2005-12-22 |
| US20070246176A1 (en) | 2007-10-25 |
| CA2569848C (en) | 2011-05-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20130610 |