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ES320608A1 - Procedure for whitening wood pastes, low in cellulose. (Machine-translation by Google Translate, not legally binding) - Google Patents

Procedure for whitening wood pastes, low in cellulose. (Machine-translation by Google Translate, not legally binding)

Info

Publication number
ES320608A1
ES320608A1 ES0320608A ES320608A ES320608A1 ES 320608 A1 ES320608 A1 ES 320608A1 ES 0320608 A ES0320608 A ES 0320608A ES 320608 A ES320608 A ES 320608A ES 320608 A1 ES320608 A1 ES 320608A1
Authority
ES
Spain
Prior art keywords
translation
cellulose
machine
low
legally binding
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
ES0320608A
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 ES320608A1 publication Critical patent/ES320608A1/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
    • D21C9/1084—Bleaching ; Apparatus therefor with reducing compounds

Landscapes

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

Abstract

Process for whitening wood pulps, low in cellulose, characterized in that the pulp or pulp is subjected to treatment at a temperature of 32 to 148º C for a period of up to 4 hours in an aqueous slurry of pulp with a pH of 5.5 to 8.0 and a content of 1 to 20% by weight of said pulp and 0.1 to 2.0% by weight of thiourea dioxide. (Machine-translation by Google Translate, not legally binding)
ES0320608A 1964-12-16 1965-12-11 Procedure for whitening wood pastes, low in cellulose. (Machine-translation by Google Translate, not legally binding) Expired ES320608A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US418911A US3384534A (en) 1964-12-16 1964-12-16 Bleaching of wood pulps with thiourea dioxide

Publications (1)

Publication Number Publication Date
ES320608A1 true ES320608A1 (en) 1966-06-01

Family

ID=23660048

Family Applications (1)

Application Number Title Priority Date Filing Date
ES0320608A Expired ES320608A1 (en) 1964-12-16 1965-12-11 Procedure for whitening wood pastes, low in cellulose. (Machine-translation by Google Translate, not legally binding)

Country Status (6)

Country Link
US (1) US3384534A (en)
DE (1) DE1546252A1 (en)
ES (1) ES320608A1 (en)
FI (1) FI43670B (en)
FR (1) FR1461003A (en)
GB (1) GB1095279A (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1079135A (en) * 1965-03-05 1967-08-16 Hardman & Holden Ltd Improvements relating to bleaching of 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
DE3309956C1 (en) * 1983-03-19 1984-07-12 Degussa Ag, 6000 Frankfurt Process for bleaching paper raw materials
JPS60142954A (en) * 1983-12-29 1985-07-29 Tokai Denka Kogyo Kk Activation of thiourea dioxide
US4675076A (en) * 1986-10-01 1987-06-23 Ppg Industries, Inc. Method for brightening pulp
FR2639371B1 (en) * 1988-11-24 1995-04-14 Atochem PROCESS FOR THE BLEACHING OF DEINKED PASTA
KR0140947B1 (en) * 1992-06-10 1998-07-01 닌까와 레이지 Method for preparing thiourea dioxide
US5958184A (en) * 1992-06-10 1999-09-28 Mitsubishi Gas Chemical Company Inc. Process for producing thiourea dioxide
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
CN105177982B (en) * 2015-10-15 2017-10-17 绍兴文理学院 A kind of dark hair floats color method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2860944A (en) * 1955-11-28 1958-11-18 Du Pont Bleaching fibers of vegetable origin with formamidine sulfinate and alkaline peroxide

Also Published As

Publication number Publication date
DE1546252A1 (en) 1970-04-30
FI43670B (en) 1971-02-01
FR1461003A (en) 1966-12-02
GB1095279A (en) 1967-12-13
US3384534A (en) 1968-05-21

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