EP0977918B1 - Procede chimique de delignification du bois utilisant comme reactif actif le bisulfite d'ammonium et de magnesium - Google Patents

Procede chimique de delignification du bois utilisant comme reactif actif le bisulfite d'ammonium et de magnesium Download PDF

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Publication number
EP0977918B1
EP0977918B1 EP98914170A EP98914170A EP0977918B1 EP 0977918 B1 EP0977918 B1 EP 0977918B1 EP 98914170 A EP98914170 A EP 98914170A EP 98914170 A EP98914170 A EP 98914170A EP 0977918 B1 EP0977918 B1 EP 0977918B1
Authority
EP
European Patent Office
Prior art keywords
acid
cooking acid
magnesium
bisulphite
ammonium
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 - Lifetime
Application number
EP98914170A
Other languages
German (de)
English (en)
Other versions
EP0977918A1 (fr
Inventor
Joao Manuel Almeida Oliveira Baptista
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Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Publication of EP0977918A1 publication Critical patent/EP0977918A1/fr
Application granted granted Critical
Publication of EP0977918B1 publication Critical patent/EP0977918B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/04—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides
    • D21C3/06—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides sulfur dioxide; sulfurous acid; bisulfites sulfites
    • D21C3/14—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides sulfur dioxide; sulfurous acid; bisulfites sulfites ammonium bisulfite
    • 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
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/04—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides
    • D21C3/06—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides sulfur dioxide; sulfurous acid; bisulfites sulfites
    • D21C3/10—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides sulfur dioxide; sulfurous acid; bisulfites sulfites magnesium bisulfite

Definitions

  • the compounds used as active chemicals are all monocationic bisulphites, mainly of calcium, magnesium, sodium or ammonium.
  • the pulping process with calcium bisulphite is an exception, when dolomite is used to prepare the acid.
  • the present innovation refers to a chemical process for wood delignification and consists of the use of a reagent solution where ammonium and magnesium bisulphites are together the active chemicals.
  • This new pulping process is particularly useful to those industrial plants where cellulose pulp is obtained by the magnesium acid bisulphite process.
  • the specific cooking acid of magnesium acid bisulphite pulping process is, physically, a gas-liquid system.
  • the liquid phase is a magnesium bisulphite and sulphur dioxide aqueous solution in equilibrium with the SO 2 gas phase.
  • the system is kept at temperature and pressure values of about 50°C and 2 Kg cm -2 , respectively.
  • This particular cooking acid will be referred further on this document as the INICIAL COOKING ACID.
  • the amount of SO 2 stoichiometrically in excess is a function of pH.
  • ammonium hydroxide must drive the initial pH value of inicial cooking acid (1.5) to a final value between 2 and 4, depending on the needs of the process. This operation could be performed in a tank with the initial cooking acid under pressure (accumulator) or in the reactor (digester).
  • the pulping process operated at a higher pH value such as that attained after ammonium hydroxide addition, decreases the wood degradation process, enables the production of cellulosic fibres with higher mechanico-physical index values, and decreases the specific consumption of wood.

Landscapes

  • Paper (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)

Claims (1)

  1. Procédé de délignification du bois, appliqué au bois d'eucalyptus, caractérisé par l'utilisation d'un mélange de sels de magnésium et de bisulfite d'ammonium comme les produits chimiques actifs, selon ce qui suit :
    a) commencer à partir d'un acide de cuisson initial ayant un pH de 1,5, une température de 50°C et une pression de 2 kg cm-2, avec la composition suivante :

            Mg(HSO3)2 (aq) + SO2 (g) ;

    b) ajouter l'hydroxyde d'ammonium afin d'obtenir un acide de cuisson final avec la composition suivante :

            Mg(HSO3)2 (aq) + NH4HSO3 (aq) + SO2 (g)

    ayant un pH de 2 à 4 et une concentration de SO2 total d'entre 4% et 7%.
EP98914170A 1997-04-28 1998-04-20 Procede chimique de delignification du bois utilisant comme reactif actif le bisulfite d'ammonium et de magnesium Expired - Lifetime EP0977918B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
PT101999A PT101999B (pt) 1997-04-28 1997-04-28 Processo quimico de deslenhificacao da madeira utilizando como reagente activo o composto - bissulfito duplo de magnesio e amonio
PT10199997 1997-04-28
PCT/PT1998/000002 WO1998049390A1 (fr) 1997-04-28 1998-04-20 Procede chimique de delignification du bois utilisant comme reactif actif le bisulfite d'ammonium et de magnesium

Publications (2)

Publication Number Publication Date
EP0977918A1 EP0977918A1 (fr) 2000-02-09
EP0977918B1 true EP0977918B1 (fr) 2007-05-09

Family

ID=20085674

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98914170A Expired - Lifetime EP0977918B1 (fr) 1997-04-28 1998-04-20 Procede chimique de delignification du bois utilisant comme reactif actif le bisulfite d'ammonium et de magnesium

Country Status (8)

Country Link
US (1) US20020153108A1 (fr)
EP (1) EP0977918B1 (fr)
AT (1) ATE362010T1 (fr)
AU (1) AU738720B2 (fr)
BR (1) BR9809423A (fr)
DE (1) DE69837755T2 (fr)
PT (1) PT101999B (fr)
WO (1) WO1998049390A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL2652193T3 (pl) 2010-12-15 2021-01-25 Ip2Ipo Innovations Limited Obróbka
US11118308B2 (en) 2013-03-15 2021-09-14 Ip2Ipo Innovations Limited Treatment of lignocellulosic biomass with ionic liquid
GB201520453D0 (en) 2015-11-20 2016-01-06 Imp Innovations Ltd Process

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL87584C (fr) * 1952-02-15
DE2445523A1 (de) * 1974-09-24 1976-04-01 Waldhof Aschaffenburg Papier Verfahren zur herstellung von zellstoff
DD151581A3 (de) * 1976-11-11 1981-10-28 Kurt Doeink Verfahren zum aufschluss lignozellulsischen materials nach dem bisulfitverfahren
JPS5653295A (en) * 1979-10-04 1981-05-12 Kogyo Gijutsuin Pulping method of waste rubber material
US4634499A (en) * 1983-05-02 1987-01-06 The Procter & Gamble Company Sulfite process for making pulp having a tactile softness from hardwood chips
SU1359387A1 (ru) * 1985-09-25 1987-12-15 Центральный научно-исследовательский институт бумаги Волокниста масса дл изготовлени гофрированной бумаги
SU1696631A1 (ru) * 1989-06-26 1991-12-07 Сибирский научно-исследовательский институт целлюлозы и картона Состав дл обработки древесной массы

Also Published As

Publication number Publication date
EP0977918A1 (fr) 2000-02-09
AU738720B2 (en) 2001-09-27
DE69837755D1 (de) 2007-06-21
DE69837755T2 (de) 2008-01-31
BR9809423A (pt) 2000-06-13
WO1998049390A1 (fr) 1998-11-05
US20020153108A1 (en) 2002-10-24
AU6858698A (en) 1998-11-24
PT101999B (pt) 2003-09-30
ATE362010T1 (de) 2007-06-15
PT101999A (pt) 1998-11-30

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