FI884432A - Process for activating lignocellulosic material with nitrogen dioxide containing gas - Google Patents

Process for activating lignocellulosic material with nitrogen dioxide containing gas Download PDF

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Publication number
FI884432A
FI884432A FI884432A FI884432A FI884432A FI 884432 A FI884432 A FI 884432A FI 884432 A FI884432 A FI 884432A FI 884432 A FI884432 A FI 884432A FI 884432 A FI884432 A FI 884432A
Authority
FI
Finland
Prior art keywords
gas
lignocellulosic material
activating
containing gas
separated
Prior art date
Application number
FI884432A
Other languages
Finnish (fi)
Swedish (sv)
Other versions
FI93231C (en
FI93231B (en
FI884432A0 (en
Inventor
Hans Olof Samuelson
Original Assignee
Mo Och Domsjoe Ab
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 Mo Och Domsjoe Ab filed Critical Mo Och Domsjoe Ab
Publication of FI884432A0 publication Critical patent/FI884432A0/en
Publication of FI884432A publication Critical patent/FI884432A/en
Application granted granted Critical
Publication of FI93231B publication Critical patent/FI93231B/en
Publication of FI93231C publication Critical patent/FI93231C/en

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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
    • D21C1/00—Pretreatment of the finely-divided materials before digesting
    • 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
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D21C11/06—Treatment of pulp gases; Recovery of the heat content of the gases; Treatment of gases arising from various sources in pulp and paper mills; Regeneration of gaseous SO2, e.g. arising from liquors containing sulfur compounds

Landscapes

  • Paper (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Micro-Organisms Or Cultivation Processes Thereof (AREA)
  • Immobilizing And Processing Of Enzymes And Microorganisms (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Compounds Of Unknown Constitution (AREA)
  • Investigating Or Analysing Biological Materials (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)

Abstract

Method of activating aqueous lignocellulosic material with a gas containing nitrogen oxide, followed by a delignification stage for the purpose of obtaining a high quality end product with no or only a slight effect on the environment. In accordance with the inventive method, the lignocellulosic material is brought into contact (18) with an oxygen-containing gas (19), and activating gas is separated from the lignocellulosic material during and/or subsequent to the activating process (9). The method is characterized by a) controlling the supply of oxygen-containing gas (12) such that the separated gas (27) contains at least 2 kg nitric oxide (NO) calculated on 1000 kg of dry lignocellulosic material, and by b) reacting the separated gas (27) in one or more stages (26) with absorption solution (25) whose original pH lies within the range 3-13.5, and by passing (28) the gas purified with the aid of absorption solution to atmosphere, or to a destruction plant optionally subsequent ot further purification of the gas.
FI884432A 1987-09-28 1988-09-27 Procedure for activating lignocellulosic material with a gas containing nitrogen dioxide FI93231C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8703718A SE460543B (en) 1987-09-28 1987-09-28 PROCEDURE FOR ACTIVATING LIGNOCELLULO MATERIAL WITH NITROGEN Dioxide CONTAINING GAS
SE8703718 1987-09-28

Publications (4)

Publication Number Publication Date
FI884432A0 FI884432A0 (en) 1988-09-27
FI884432A true FI884432A (en) 1989-03-29
FI93231B FI93231B (en) 1994-11-30
FI93231C FI93231C (en) 1995-03-10

Family

ID=20369679

Family Applications (1)

Application Number Title Priority Date Filing Date
FI884432A FI93231C (en) 1987-09-28 1988-09-27 Procedure for activating lignocellulosic material with a gas containing nitrogen dioxide

Country Status (12)

Country Link
EP (1) EP0309998B1 (en)
JP (1) JP2510424B2 (en)
AT (1) ATE101886T1 (en)
AU (1) AU605913B2 (en)
CA (1) CA1301412C (en)
DE (1) DE3887948T2 (en)
ES (1) ES2049234T3 (en)
FI (1) FI93231C (en)
NO (1) NO172698C (en)
NZ (1) NZ226104A (en)
SE (1) SE460543B (en)
ZA (1) ZA887229B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE9200183L (en) * 1992-01-23 1993-07-24 Kamyr Ab SEPARATORY DEVICE AND PROCEDURE

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4165253A (en) * 1978-07-20 1979-08-21 Ivanov Mikhail A Process for producing pulp
SE421938B (en) * 1980-06-05 1982-02-08 Mo Och Domsjoe Ab PROCEDURE FOR TREATMENT OF CELLULOSAMASSA
SE451023B (en) * 1985-12-10 1987-08-24 Mo Och Domsjoe Ab METHOD OF ACTIVATING LIGNOCELLULOSAMATER MATERIAL WITH NITROGEN Dioxide CONTAINING GAS

Also Published As

Publication number Publication date
DE3887948T2 (en) 1994-08-18
DE3887948D1 (en) 1994-03-31
SE8703718D0 (en) 1987-09-28
NO172698C (en) 1993-08-25
NO172698B (en) 1993-05-18
FI93231C (en) 1995-03-10
EP0309998B1 (en) 1994-02-23
FI93231B (en) 1994-11-30
EP0309998A2 (en) 1989-04-05
NO884279L (en) 1989-03-29
AU605913B2 (en) 1991-01-24
CA1301412C (en) 1992-05-26
FI884432A0 (en) 1988-09-27
ATE101886T1 (en) 1994-03-15
JPH01104894A (en) 1989-04-21
ZA887229B (en) 1989-06-28
EP0309998A3 (en) 1991-07-17
NZ226104A (en) 1990-05-28
SE460543B (en) 1989-10-23
ES2049234T3 (en) 1994-04-16
NO884279D0 (en) 1988-09-27
JP2510424B2 (en) 1996-06-26
SE8703718L (en) 1989-03-29
AU2283288A (en) 1989-04-06

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Legal Events

Date Code Title Description
MM Patent lapsed

Owner name: MO OCH DOMSJOE AKTIEBOLAG