EP0206560A2 - Alkalische Peroxid-Sauerstoff-Behandlung für ungebleichte und chlorierte chemische Pulpen - Google Patents

Alkalische Peroxid-Sauerstoff-Behandlung für ungebleichte und chlorierte chemische Pulpen Download PDF

Info

Publication number
EP0206560A2
EP0206560A2 EP86304123A EP86304123A EP0206560A2 EP 0206560 A2 EP0206560 A2 EP 0206560A2 EP 86304123 A EP86304123 A EP 86304123A EP 86304123 A EP86304123 A EP 86304123A EP 0206560 A2 EP0206560 A2 EP 0206560A2
Authority
EP
European Patent Office
Prior art keywords
pulp
weight
peroxide
compound
group
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.)
Ceased
Application number
EP86304123A
Other languages
English (en)
French (fr)
Other versions
EP0206560A3 (de
Inventor
Norman Liebergott
Barbara Van Lierop
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FPInnovations
Original Assignee
Pulp and Paper Research Institute of Canada
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pulp and Paper Research Institute of Canada filed Critical Pulp and Paper Research Institute of Canada
Publication of EP0206560A2 publication Critical patent/EP0206560A2/de
Publication of EP0206560A3 publication Critical patent/EP0206560A3/de
Ceased legal-status Critical Current

Links

Images

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

Definitions

  • the present invention relates to the treatment of a cellulosic material and more particularly, relates to improvements in the delignification and/or bleaching of chemical pulps.
  • Bleaching is a continuation of the cooking process in which the lignious material and colouring matter remaining in the chemical pulp are removed selectively with as little degradation of pulp fibre as possible. Bleaching of pulp has advanced to a high degree of sophistication involving multistage procedures. The bleaching of a chemical pulp is accomplished in several stages which together, constitute a bleaching sequence.
  • Each stage consists of a phase starting with the addition and reaction of a chemical with a pulp, and ending with the washing of the pulp.
  • process variables which are dictated by the type of reaction desired in that particular stage and the operating conditions of that stage. These variables include: percent of chemical added and consumed, chemical concentration, consistency, temperature, time and pH.
  • the delignifying and brightening action of air or oxygen on a chemical cellulosic pulp in an alkaline medium has long been known.
  • the pre-dominant processes are presently carried out at high consistency (25-30%) on pulp previously impregnated with an alkali (usually 2.0 -3.0% NaOH on pulp, oven-dry basis) and a magnesium ion complex - (0.05-0.1% magnesium ion on pulp, oven-dry basis).
  • the pulp is then fluffed and exposed to oxygen at a pressure of 0.6-0.8 MPa at 80-165°C for a reaction time of up to 30 minutes.
  • alkaline hydrogen peroxide solution as a delignifying and brightening agent for unbleached kraft and sulphite pulp is known.
  • the optimum conditions for the use of alkaline hydrogen peroxide have been reported for softwood pulp to be: consistency 10-20%, retention time 2 hours, temperature 80-100°C, NaOH charge 2.5% on pulp and 1% hydrogen peroxide on pulp, oven-dry basis. By applying these conditions, it is possible to decrease a Kappa number from the original value of 30 to about 18 on a softwood kraft pulp.
  • the second improvement involves the treatment of a washed chlorinated pulp which comprises subjecting the pulp to the simultaneous reaction of a peroxygen compound, an alkali compound and an oxygen containing gas under desired process conditions.
  • the pulp is first delignified using the first improvement set forth above, and then the washed pulp is treated in a chlorination stage (C, C/D or D/C) with C referring to the use of chlorine alone, C/D to a chlorination stage where 5 to 30% of the total active chlorine is placed by chlorine dioxide, and D/C where 30 to 70% of the total active chlorine is replaced by chlorine dioxide. Subsequently, the washed chlorinated pulp is subjected to the step of the second improvement as per the above.
  • C chlorination stage
  • the present invention is applicable to any chemical cellulosic pulp (i.e. kraft, soda or sulphite) and can be used with both softwood or hardwood pulp and/or other varieties of fibrous non-woody lignocellulose material such as, for example, bagasse or hemp.
  • chemical cellulosic pulp i.e. kraft, soda or sulphite
  • softwood or hardwood pulp i.e. kraft, soda or sulphite
  • fibrous non-woody lignocellulose material such as, for example, bagasse or hemp.
  • a delignification/bleaching process comprising the step of simultaneously treating a lignin containing, chemically cooked, washed pulp with 0.5% to 4% of an alkali compound, 0.1 to 2% of a peroxygen compound, and 0.4 to 0.6% of an oxygen gas at a partial pressure of between 0.01 to 0.4 MPa, in the presence of a catalyst to prevent the reduction of viscosity, at a temperature of between 40-95 ° C for a time between 1 minute to 120 minutes at a pulp consistency of between 5% and 25%. All measurements stated herein are by weight on an oven-dry pulp basis.
  • an improvement in a process for brightening pulp which has been treated according to the first aspect herein above and subsequently treated with a chlorine containing compound and washed, the improvement comprising the step of treating the washed chlorinated pulp simultaneously with 0.5% to 4% of an alkali compound, 0.1 to 1% of a peroxygen compound, and 0.1 to 3% of an oxygen containing gas at 0.1 to 0.4 MPa, at a temperature of between 50-90°C for a period of between 3 to 120 minutes at a pulp consistency of between 5% and 25%.
  • an improvement in a delignification/bleaching process comprising the step of treating a washed chlorinated pulp simultaneously with 0.5% to 4% of an alkali compound, 0.1 to 1.0% of a peroxygen compound, and 0.1 to 3% of an oxygen containing gas at 0.1 to 0.4 MPa, at a temperature of between 50-90°C for a period of between 3 to 120 minutes at a pulp consistency of between 5% and 25%.
  • an acid treatment and/or a washing step to remove any black liquor from the pulp may be carried out and after the delignification stage, a washing step to remove the reaction products is utilized.
  • the peroxygen compound may include conventional inorganic peroxides such as hydrogen and sodium or an organic peroxide such as benzoyl peroxide, tertiary-butyl hydroperoxide, and peracetic acid.
  • conventional inorganic peroxides such as hydrogen and sodium
  • an organic peroxide such as benzoyl peroxide, tertiary-butyl hydroperoxide, and peracetic acid.
  • Conventionally used alkali compounds include sodium hydroxide, sodium carbonate, calcium carbonate, magnesium carbonate, magnesium hydroxide, etc.
  • the alkaline compound preferably sodium hydroxide
  • the peroxygen compound is preferably charged at 0.5 to 1.8% by weight and the oxygen at between 0.5 to 2.2% by weight.
  • a preferred catalyst is magnesium sulphate which can be added in charges ranging between 0.1 to 1% by weight.
  • the oxygen is introduced and maintained at a pressure of between 0.1 to 0.3 MPa for a preferred time range of between 3 to 30 minutes.
  • the preferred ranges of temperature, total time and pulp consistency will be between 70-95°C, 3-60 minutes and 9 to 15% respectively.
  • the pH at the end of the treatment will normally be between 9.5 to 12.
  • the pulp is subjected to a normal washing step to remove the reaction products.
  • the alkaline compound preferably sodium hydroxide
  • the peroxygen compound is preferably charged at between 0.2 and 0.7% by weight and the oxygen at between 0.4 to 0.6% by weight at a pressure of between 0.1 to 0.3 MPa.
  • Preferred process conditions are: consistency of between 8 to 20%, a time of between 3 to 30 minutes and a temperature of 60 to 90°C.
  • a viscosity protecting catalyst such as the magnesium ion in the amount of between 0.1 and 1.0% by weight can be beneficially used.
  • One portion of the unbleached pulp was treated with a solution containing 2.5% NaOH on pulp, OD basis, mixed at 10% consistency and a temperature of 80°C.
  • One portion of the unbleached pulp was treated with a solution containing 2.5% NaOH and 0.5% MgSO 4 on pulp, OD basis, then gaseous oxygen was added and mixed at 10% consistency and a temperature of 80°C and held at one oxygen pressure of 0.14 MPa.
  • One portion of the unbleached pulp was treated with a solution containing 2.5% NaOH, and 0.5% MgSO. on pulp, OD basis, and mixed at 10% consistency and a temperature of 80°C, and held at an oxygen pressure of 0.50 MPa.
  • the treatment of the present invention improves the extent of the delignification of the pulp as measured by the Kappa number. At the same time, less pulp degradation occurs as measured by the viscosity. Thus, significantly, the hydrogen peroxide and oxygen at the low pressure provides better results than the oxygen delignification at the higher pressure without the peroxide.
  • the alkaline/peroxide/oxygen treatment is employed with a pulp that has been semi-delignified.
  • This pulp may be delignified in a conventional manner or in the manner taught herein.
  • the pulp Prior to the present treatment (hereinafter designated as an EPO stage or an X stage, the pulp is normally subjected to a chlorine or chlorine dioxide treatment.
  • the present invention can conveniently be practiced using an oxygen containing gas which along with the lignocellulose containing material and alkaline and peroxide compounds are mixed by a mixer installed immediately before either an upflow tower or an upflow retention tube prior to entering into a downflow tower.
  • the compounds utilized in the practice of the present invention may be selected from those well known to those skilled in the art.
  • the peroxygen compound employed in the extraction stage may include an inorganic peroxide such as hydrogen or sodium peroxide and organic peroxides such as benzoyl peroxide and tertiary-butyl hydroperoxide.
  • the alkali may be sodium hydroxide, sodium carbonate or magnesium carbonate.
  • Preferred ranges of treatment for carrying out the third aspect of the invention include using the peroxygen compound at between 0.2 to 0.7% by weight of oven-dried pulp, the hydroxide compound at between 2 to 3.5% by weight and oxygen at between 0.4 to 0.6% by weight.
  • the oxygen pressure is preferably maintained at between 0.05 to 0.15 MPa and process parameters are a temperature range of between 40°C to 90°C and a 3 to 30 minute reaction time with a consistency of between 8% to 20%.
  • the second sample was chlorinated. with a mixture of chlorine and chlorine dioxide where the chlorine dioxide replaced 7% of the chlorine charge.
  • the third sample of pulp was chlorinated sequentially with chlorine dioxide and chlorine.
  • the chlorine dioxide replaced 40% of the total chlorine charge.
  • the combination of alkaline hydroxide, peroxide and oxygen improved the extent of delignification as measured by the Kappa number in each group of the different chlorinated pulps.
  • the brightness of the peroxide-oxidative extraction treated pulp was substantially higher than that obtained after other oxidative extractions.
  • a combination of sodium hydroxide, peroxide, and oxygen was used as a predelignification stage and as peroxide oxidative extraction stage (each designated as an (EPO) or an X stage) following a chlorination stage.
  • a softwood kraft pulp, Kappa number 26.6, 0.5% cuene viscosity 26.3 mPa.s was treated in an X delignification stage at 10% consistency by simultaneously treating the pulp in the presence of hydrogen peroxide, sodium hydroxide, magnesium sulphate, and oxygen at a pressure of 0.14 MPa.
  • the conditions are listed in Table III.
  • the third portion was extracted with sodium hydroxide, hydrogen peroxide and oxygen -X.
  • Each extracted sample of pulp was then divided into 4 equal portions and each portion was treated with a different charge of chlorine dioxide using conditions listed in Table III.
  • the brightness obtained for each sample along with the viscosities are shown in Table III.
  • the superiority of the XC/DXD-treatment is shown in that a 91.3% ISO brightness was obtained using 0.40% chlorine dioxide (oven-dry basis) in the D stage, whereas after XC/DED and XC/D(EO)D, the brightnesses were 88.0 and 89.8% ISO, respectively.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
EP86304123A 1985-06-17 1986-05-30 Alkalische Peroxid-Sauerstoff-Behandlung für ungebleichte und chlorierte chemische Pulpen Ceased EP0206560A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA484110 1985-06-17
CA000484110A CA1251903A (en) 1985-06-17 1985-06-17 Alkaline-peroxide-oxygen treatment of unbleached and chlorinated chemical pulps

Publications (2)

Publication Number Publication Date
EP0206560A2 true EP0206560A2 (de) 1986-12-30
EP0206560A3 EP0206560A3 (de) 1988-07-20

Family

ID=4130718

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86304123A Ceased EP0206560A3 (de) 1985-06-17 1986-05-30 Alkalische Peroxid-Sauerstoff-Behandlung für ungebleichte und chlorierte chemische Pulpen

Country Status (6)

Country Link
EP (1) EP0206560A3 (de)
JP (1) JPS6253497A (de)
BR (1) BR8602790A (de)
CA (1) CA1251903A (de)
FI (1) FI862546L (de)
NO (1) NO862381L (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0429767A1 (de) * 1989-11-17 1991-06-05 Air Products And Chemicals, Inc. Delignifizierung von Lignocellulose enthaltenden Fasern
WO1994029511A1 (en) * 1993-06-08 1994-12-22 Kvaerner Pulping Technologies Ab Process in association with pulp bleaching
WO2012038966A1 (en) 2010-09-22 2012-03-29 Tyche Industries Ltd. Process for the preparation of donepezil intermediate
US20150337486A1 (en) * 2014-05-20 2015-11-26 Georgia-Pacific Consumer Products Lp Bleaching and shive reduction process for non-wood fibers
US10640899B2 (en) 2014-05-20 2020-05-05 Gpcp Ip Holdings Llc Bleaching and shive reduction process for non-wood fibers
US10844538B2 (en) 2014-05-20 2020-11-24 Gpcp Ip Holdings Llc Bleaching and shive reduction process for non-wood fibers

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6231718B1 (en) 1992-02-28 2001-05-15 International Paper Company Two phase ozone and oxygen pulp treatment
US9932709B2 (en) 2013-03-15 2018-04-03 Ecolab Usa Inc. Processes and compositions for brightness improvement in paper production

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1100709A (en) * 1965-06-25 1968-01-24 Pulp Paper Res Inst Two-stage purification of fibrous cellulose material
US3719552A (en) * 1971-06-18 1973-03-06 American Cyanamid Co Bleaching of lignocellulosic materials with oxygen in the presence of a peroxide
DE3207157C1 (de) * 1982-02-27 1983-06-09 Degussa Ag, 6000 Frankfurt Verfahren zur Herstellung von halbgebleichten Zellstoffen
US4568420B1 (en) * 1984-12-03 1999-03-02 Int Paper Co Multi-stage bleaching process including an enhanced oxidative extraction stage

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0429767A1 (de) * 1989-11-17 1991-06-05 Air Products And Chemicals, Inc. Delignifizierung von Lignocellulose enthaltenden Fasern
WO1994029511A1 (en) * 1993-06-08 1994-12-22 Kvaerner Pulping Technologies Ab Process in association with pulp bleaching
WO1994029515A1 (en) * 1993-06-08 1994-12-22 Kvaerner Pulping Technologies Ab Process in association with pulp bleaching
US5571377A (en) * 1993-06-08 1996-11-05 Kvaerner Pulping Technologies Ab Process for peroxide bleaching of chemical pulp in a pressurized bleach vessel
AU677373B2 (en) * 1993-06-08 1997-04-24 Kvaerner Pulping Technologies Ab Process in association with pulp bleaching
CN1044504C (zh) * 1993-06-08 1999-08-04 卡瓦纳碎浆处理公司 纸浆漂白的方法
WO2012038966A1 (en) 2010-09-22 2012-03-29 Tyche Industries Ltd. Process for the preparation of donepezil intermediate
US20150337486A1 (en) * 2014-05-20 2015-11-26 Georgia-Pacific Consumer Products Lp Bleaching and shive reduction process for non-wood fibers
WO2015179385A1 (en) * 2014-05-20 2015-11-26 Georgia-Pacific Consumer Products Lp Bleaching and shive reduction process for non-wood fibers
US10640899B2 (en) 2014-05-20 2020-05-05 Gpcp Ip Holdings Llc Bleaching and shive reduction process for non-wood fibers
US10711399B2 (en) * 2014-05-20 2020-07-14 Gpcp Ip Holdings Llc Bleaching and shive reduction process for non-wood fibers
US10844538B2 (en) 2014-05-20 2020-11-24 Gpcp Ip Holdings Llc Bleaching and shive reduction process for non-wood fibers

Also Published As

Publication number Publication date
NO862381L (no) 1986-12-18
CA1251903A (en) 1989-04-04
FI862546A7 (fi) 1986-12-18
FI862546A0 (fi) 1986-06-16
JPS6253497A (ja) 1987-03-09
EP0206560A3 (de) 1988-07-20
BR8602790A (pt) 1987-02-10
NO862381D0 (no) 1986-06-16
FI862546L (fi) 1986-12-18

Similar Documents

Publication Publication Date Title
US4568420A (en) Multi-stage bleaching process including an enhanced oxidative extraction stage
US5310458A (en) Process for bleaching lignocellulose-containing pulps
US3888727A (en) Treatment of lignocellulosic material in an alkaline pulping liquor containing anthraquinone sulphonic acid followed by oxygen delignification
EP0679760A1 (de) Verfahren zum Bleichen von Lignocellulose-enthaltendem Zellstoffen
US5656130A (en) Ambient temperature pulp bleaching with peroxyacid salts
US5411635A (en) Ozone/peroxymonosulfate process for delignifying a lignocellulosic material
EP0206560A2 (de) Alkalische Peroxid-Sauerstoff-Behandlung für ungebleichte und chlorierte chemische Pulpen
US8268120B2 (en) Method for bleaching chemical paper pulps by final ozone treatment at high temperature
EP0519061B1 (de) Stufenweise alkalizugabe bei der hochkonsistenz-sauerstoffdelignifizierung
US6235153B1 (en) Method of producing a bleached pulp with chlorine dioxide under a pressure created by a compressed gas containing oxygen
KR930002072B1 (ko) 과산화수소 강화된 산소 탈리그닌화 방법
JPH0672385B2 (ja) リグノセルロース材料の漂白方法
CA1070909A (en) Nitrogen dioxide-oxygen delignification
USH1690H (en) Process for bleaching kraft pulp
WO1994020672A1 (en) Process for bleaching pulp
EP0515362B1 (de) Verfahren zum bleichen von lignozellulosehaltigem material mit dioxiranen
US4526651A (en) Process for oxygen bleaching paper pulp using melamine as a viscosity stabilizer
CA2144433A1 (en) Improved bleaching of high consistency lignocellulosic pulp
CA2032315C (en) Process for bleaching of chemical cellulose pulp
JPH08218290A (ja) 非塩素漂白パルプの製造方法
WO1991000386A1 (en) A method for bleaching kraft pulp with a mixture of oxygen and peroxide
US20030024664A1 (en) Eop & Ep process for bleaching of chemical pulp
EP0931874A1 (de) Verfahren zum Bleichen von Pulpe umfassend eine Endstufe in welcher die Pulpe mit einem Salz von Peroxymonoschwefelsäure behandelt wird
KR19990005398A (ko) 고수율기계펄프의 표백방법

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE DE FR GB SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE DE FR GB SE

17P Request for examination filed

Effective date: 19890111

17Q First examination report despatched

Effective date: 19900720

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED

18R Application refused

Effective date: 19920514

RIN1 Information on inventor provided before grant (corrected)

Inventor name: LIEBERGOTT, NORMAN

Inventor name: VAN LIEROP, BARBARA