ES322925A1 - Procedure to reductively bleach wooden pulps of low cellulosic content. (Machine-translation by Google Translate, not legally binding) - Google Patents

Procedure to reductively bleach wooden pulps of low cellulosic content. (Machine-translation by Google Translate, not legally binding)

Info

Publication number
ES322925A1
ES322925A1 ES0322925A ES322925A ES322925A1 ES 322925 A1 ES322925 A1 ES 322925A1 ES 0322925 A ES0322925 A ES 0322925A ES 322925 A ES322925 A ES 322925A ES 322925 A1 ES322925 A1 ES 322925A1
Authority
ES
Spain
Prior art keywords
pulp
translation
machine
legally binding
google translate
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
ES0322925A
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.)
FMC Corp
Original Assignee
FMC Corp
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 FMC Corp filed Critical FMC Corp
Publication of ES322925A1 publication Critical patent/ES322925A1/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
    • D21C9/1026—Other features in bleaching processes
    • D21C9/1036—Use of compounds accelerating or improving the efficiency of the processes

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)

Abstract

"Process for reductively whitening wood pulps of low cellulosic content", characterized in that a wood pulp with low cellulose content is treated in an aqueous suspension containing 1 to 20% by weight of said pulp and a bleaching amount of an agent reductive bleach under bleaching conditions, at a pH of the order of 2.0 to 8.5 and at a temperature of the order of 90 to 300º F, for up to 4 hours, characterized in that it is included in said pulp with said reductive bleaching agent , from 0.05 to 1.0% thiourea, based on the weight of said pulp, by virtue of which the reversion of brightness of the bleached pulp produced by said reductive bleaching process is minimized. (Machine-translation by Google Translate, not legally binding)
ES0322925A 1965-02-23 1966-02-11 Procedure to reductively bleach wooden pulps of low cellulosic content. (Machine-translation by Google Translate, not legally binding) Expired ES322925A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US43462765A 1965-02-23 1965-02-23

Publications (1)

Publication Number Publication Date
ES322925A1 true ES322925A1 (en) 1966-11-16

Family

ID=23724985

Family Applications (1)

Application Number Title Priority Date Filing Date
ES0322925A Expired ES322925A1 (en) 1965-02-23 1966-02-11 Procedure to reductively bleach wooden pulps of low cellulosic content. (Machine-translation by Google Translate, not legally binding)

Country Status (9)

Country Link
US (1) US3507743A (en)
BE (1) BE676663A (en)
DE (1) DE1546253A1 (en)
DK (1) DK109015C (en)
ES (1) ES322925A1 (en)
FI (1) FI43809B (en)
GB (1) GB1095280A (en)
NL (1) NL6601601A (en)
SE (1) SE314580B (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4002526A (en) * 1975-10-10 1977-01-11 International Paper Company Oxygen-alkali delignification of low consistency wood pulp
US4244780A (en) * 1979-11-15 1981-01-13 Nalco Chemical Company Use of thiourea dioxide in pulp bleaching processes to preserve pulp strength and aid in brightness
US4675076A (en) * 1986-10-01 1987-06-23 Ppg Industries, Inc. Method for brightening pulp
US5338402A (en) * 1987-05-25 1994-08-16 Societe Atochem Process for preparing a bleached chemithermomechanical pulp
US5958184A (en) * 1992-06-10 1999-09-28 Mitsubishi Gas Chemical Company Inc. Process for producing thiourea dioxide
FI105701B (en) * 1995-10-20 2000-09-29 Ahlstrom Machinery Oy Method and arrangement for treatment of pulp
US6899790B2 (en) * 2000-03-06 2005-05-31 Georgia-Pacific Corporation Method of providing papermaking fibers with durable curl
US6627041B2 (en) * 2000-03-06 2003-09-30 Georgia-Pacific Corporation Method of bleaching and providing papermaking fibers with durable curl
US6428653B1 (en) 2000-12-04 2002-08-06 West Fraser Timber Co. Ltd. Method of bleaching with formamidine sulfinic acid using a reducing agent to eliminate residual peroxide
PL1828480T3 (en) * 2004-12-21 2014-10-31 Solenis Tech Cayman Lp Reactive cationic resins for use as dry and wet strength agents in sulfite ion-containing papermaking systems

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2071304A (en) * 1934-12-04 1937-02-16 Great Western Electro Chemical Co Process of manufacture of products of ground wood pulp

Also Published As

Publication number Publication date
FI43809B (en) 1971-03-01
DE1546253A1 (en) 1970-04-30
NL6601601A (en) 1966-08-24
US3507743A (en) 1970-04-21
BE676663A (en) 1966-07-18
GB1095280A (en) 1967-12-13
DK109015C (en) 1968-03-04
SE314580B (en) 1969-09-08

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