CA2113642C - A process for producing thiourea dioxide and a process for bleaching pulp for papermaking by the use of thiourea dioxide obtained by said production process - Google Patents

A process for producing thiourea dioxide and a process for bleaching pulp for papermaking by the use of thiourea dioxide obtained by said production process

Info

Publication number
CA2113642C
CA2113642C CA002113642A CA2113642A CA2113642C CA 2113642 C CA2113642 C CA 2113642C CA 002113642 A CA002113642 A CA 002113642A CA 2113642 A CA2113642 A CA 2113642A CA 2113642 C CA2113642 C CA 2113642C
Authority
CA
Canada
Prior art keywords
bleaching
pulp
tudo
thiourea
peroxide
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 - Fee Related
Application number
CA002113642A
Other languages
English (en)
French (fr)
Inventor
Toshiaki Kanada
Seikyu Jinnouchi
Masafumi Shimpo
Tetsuo Koshitsuka
Akiko Kimura
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.)
Mitsubishi Gas Chemical Co Inc
Original Assignee
Mitsubishi Gas Chemical Co Inc
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 Mitsubishi Gas Chemical Co Inc filed Critical Mitsubishi Gas Chemical Co Inc
Application granted granted Critical
Publication of CA2113642C publication Critical patent/CA2113642C/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C381/00—Compounds containing carbon and sulfur and having functional groups not covered by groups C07C301/00 - C07C337/00
    • C07C381/14—Compounds containing a carbon atom having four bonds to hetero atoms with a double bond to one hetero atom and at least one bond to a sulfur atom further doubly-bound to oxygen atoms

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
CA002113642A 1992-06-10 1993-06-08 A process for producing thiourea dioxide and a process for bleaching pulp for papermaking by the use of thiourea dioxide obtained by said production process Expired - Fee Related CA2113642C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP15077392 1992-06-10
JP04-150773 1992-06-10
JP05-099498 1993-04-26
JP9949893 1993-04-26
PCT/JP1993/000769 WO1993025522A1 (fr) 1992-06-10 1993-06-08 Procede de production de dioxyde de thio-uree et de blanchiment de la pate a papier a l'aide de cette dioxyde de thio-uree

Publications (1)

Publication Number Publication Date
CA2113642C true CA2113642C (en) 1999-11-09

Family

ID=26440627

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002113642A Expired - Fee Related CA2113642C (en) 1992-06-10 1993-06-08 A process for producing thiourea dioxide and a process for bleaching pulp for papermaking by the use of thiourea dioxide obtained by said production process

Country Status (8)

Country Link
EP (1) EP0607448B1 (OSRAM)
KR (2) KR0140947B1 (OSRAM)
AU (1) AU660104B2 (OSRAM)
CA (1) CA2113642C (OSRAM)
DE (1) DE69309644T2 (OSRAM)
FI (1) FI114486B (OSRAM)
TW (1) TW262501B (OSRAM)
WO (1) WO1993025522A1 (OSRAM)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3384534A (en) * 1964-12-16 1968-05-21 Fmc Corp Bleaching of wood pulps with thiourea dioxide
JPS5220971B2 (OSRAM) * 1971-10-18 1977-06-07
JPS5839155B2 (ja) * 1978-07-25 1983-08-27 東海電化工業株式会社 二酸化チオ尿素の製造法
JPS5913756A (ja) * 1982-07-06 1984-01-24 アレキサンダ−・イバノビツチ・クルグロフ チオウレア二酸化物の製造方法
JPS61194289A (ja) * 1985-02-25 1986-08-28 三菱瓦斯化学株式会社 古紙の再生方法
US4656270A (en) * 1985-03-15 1987-04-07 Mcneilab, Inc. Process for producing guanidines such as linogliride
DE3739655A1 (de) * 1987-11-23 1989-06-01 Sued Chemie Ag Bleichmittelzusatz

Also Published As

Publication number Publication date
WO1993025522A1 (fr) 1993-12-23
EP0607448A4 (en) 1994-09-14
EP0607448B1 (en) 1997-04-09
EP0607448A1 (en) 1994-07-27
KR0140947B1 (ko) 1998-07-01
AU660104B2 (en) 1995-06-08
AU4355193A (en) 1994-01-04
DE69309644T2 (de) 1997-07-24
FI940588L (fi) 1994-02-09
DE69309644D1 (de) 1997-05-15
KR0140901B1 (ko) 1998-07-01
TW262501B (OSRAM) 1995-11-11
FI114486B (fi) 2004-10-29
FI940588A0 (fi) 1994-02-09

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed