ES438433A1 - Process for bleaching of lignocellulosic material - Google Patents

Process for bleaching of lignocellulosic material

Info

Publication number
ES438433A1
ES438433A1 ES438433A ES438433A ES438433A1 ES 438433 A1 ES438433 A1 ES 438433A1 ES 438433 A ES438433 A ES 438433A ES 438433 A ES438433 A ES 438433A ES 438433 A1 ES438433 A1 ES 438433A1
Authority
ES
Spain
Prior art keywords
lignocellulosic material
bleaching
treating
water
nitric oxide
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
Application number
ES438433A
Other languages
Spanish (es)
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.)
PPG Architectural Coatings Canada Inc
Original Assignee
Canadian Industries Ltd
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 Canadian Industries Ltd filed Critical Canadian Industries Ltd
Publication of ES438433A1 publication Critical patent/ES438433A1/en
Expired legal-status Critical Current

Links

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
    • D21C9/1063—Bleaching ; Apparatus therefor with compounds not otherwise provided for, e.g. activated gases
    • 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
    • D21C9/1057—Multistage, with compounds cited in more than one sub-group D21C9/10, D21C9/12, D21C9/16

Abstract

Procedure for bleaching lignocellulosic material, characterized in that it comprises the steps of: (1) treating the lignocellulosic material in an aqueous medium with a mixture of nitric oxide and nitrogen dioxide, the nitric oxide component being in molar excess; (2) wash the treated material with water; and (3) treating the washed material with alkaline material in the presence of water. (Machine-translation by Google Translate, not legally binding)
ES438433A 1974-06-11 1975-06-11 Process for bleaching of lignocellulosic material Expired ES438433A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB25845/74A GB1505070A (en) 1974-06-11 1974-06-11 Process for bleaching of lignocellulosic material

Publications (1)

Publication Number Publication Date
ES438433A1 true ES438433A1 (en) 1977-05-16

Family

ID=10234280

Family Applications (1)

Application Number Title Priority Date Filing Date
ES438433A Expired ES438433A1 (en) 1974-06-11 1975-06-11 Process for bleaching of lignocellulosic material

Country Status (10)

Country Link
JP (1) JPS522003B2 (en)
BR (1) BR7503680A (en)
CA (1) CA1045759A (en)
DE (1) DE2526084C2 (en)
ES (1) ES438433A1 (en)
FI (1) FI751734A (en)
FR (1) FR2274729A1 (en)
GB (1) GB1505070A (en)
NO (1) NO147761C (en)
SE (1) SE7506646L (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1070909A (en) * 1976-05-04 1980-02-05 Canadian Industries Limited Nitrogen dioxide-oxygen delignification
SE421938B (en) * 1980-06-05 1982-02-08 Mo Och Domsjoe Ab PROCEDURE FOR TREATMENT OF CELLULOSAMASSA
SE425674B (en) * 1981-03-23 1982-10-25 Mo Och Domsjoe Ab PROCEDURE FOR DELIGNIFICATION OF CELLULOSAMASSA WITH NITROGEN Dioxide AND Oxygen
DE3118384C1 (en) * 1981-05-09 1982-11-11 Mannesmann AG, 4000 Düsseldorf Process for bleaching chemically produced pulp with ozone
SE448006B (en) * 1981-09-21 1987-01-12 Mo Och Domsjoe Ab PROCEDURE FOR WHITING CELLULOSAMASSA INCLUDING AN ACTIVATION STEP WITH NITROGEN OXIDES
SE450393B (en) * 1981-10-27 1987-06-22 Mo Och Domsjoe Ab PROCEDURE FOR TREATMENT OF WOOD WITH NITROGEN OXIDES AND OBJECTIVE SULFATE COOKING

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE212838C (en) *
DE204460C (en) *
DE391713C (en) * 1922-12-12 1924-03-11 Paul Krais Dr Method for breaking up straw, reeds and the like like

Also Published As

Publication number Publication date
GB1505070A (en) 1978-03-22
NO752025L (en) 1975-12-12
FR2274729A1 (en) 1976-01-09
NO147761C (en) 1983-06-08
FR2274729B1 (en) 1978-09-22
CA1045759A (en) 1979-01-09
BR7503680A (en) 1976-06-29
SE7506646L (en) 1975-12-12
FI751734A (en) 1975-12-12
AU8201275A (en) 1976-12-16
JPS5132802A (en) 1976-03-19
DE2526084A1 (en) 1976-01-02
DE2526084C2 (en) 1981-11-26
NO147761B (en) 1983-02-28
JPS522003B2 (en) 1977-01-19

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