EP0977918A1 - A wood delignification chemical process using ammonium magnesium bisulphite as the active reagent - Google Patents
A wood delignification chemical process using ammonium magnesium bisulphite as the active reagentInfo
- Publication number
- EP0977918A1 EP0977918A1 EP98914170A EP98914170A EP0977918A1 EP 0977918 A1 EP0977918 A1 EP 0977918A1 EP 98914170 A EP98914170 A EP 98914170A EP 98914170 A EP98914170 A EP 98914170A EP 0977918 A1 EP0977918 A1 EP 0977918A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- acid
- bisulphite
- magnesium
- wood
- chemical process
- 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.)
- Granted
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
- 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 major disadvantage of bisulphite pulps is the weaker mechano- physical characteristics of their cellulosic fibres when compared with those obtained by the KRAFT process.
- 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.
- 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 S0 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 cooking acid obtained by this reaction will be referred to in this document as the FINAL COOKING ACID.
- the amount of S0 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). In the FINAL COOKING ACID the percentage of total S0 2 , free plus combined forms, must be kept within 4% to 7% , depending on the requirements of the process.
- 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)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PT101999A PT101999B (en) | 1997-04-28 | 1997-04-28 | CHEMICAL PROCESS OF DESLENHIFICATION OF WOOD USING AS AN ACTIVE REAGENT THE COMPOUND - DOUBLE BISCULPTURE OF MAGNESIUM AND AMMONIUM |
PT10199997 | 1997-04-28 | ||
PCT/PT1998/000002 WO1998049390A1 (en) | 1997-04-28 | 1998-04-20 | A wood delignification chemical process using ammonium magnesium bisulphite as the active reagent |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0977918A1 true EP0977918A1 (en) | 2000-02-09 |
EP0977918B1 EP0977918B1 (en) | 2007-05-09 |
Family
ID=20085674
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98914170A Expired - Lifetime EP0977918B1 (en) | 1997-04-28 | 1998-04-20 | A wood delignification chemical process using ammonium magnesium bisulphite as the active reagent |
Country Status (8)
Country | Link |
---|---|
US (1) | US20020153108A1 (en) |
EP (1) | EP0977918B1 (en) |
AT (1) | ATE362010T1 (en) |
AU (1) | AU738720B2 (en) |
BR (1) | BR9809423A (en) |
DE (1) | DE69837755T2 (en) |
PT (1) | PT101999B (en) |
WO (1) | WO1998049390A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
PL2652193T3 (en) | 2010-12-15 | 2021-01-25 | Ip2Ipo Innovations Limited | Treatment |
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL87584C (en) * | 1952-02-15 | |||
DE2445523A1 (en) * | 1974-09-24 | 1976-04-01 | Waldhof Aschaffenburg Papier | METHOD FOR MANUFACTURING PULP |
DD151581A3 (en) * | 1976-11-11 | 1981-10-28 | Kurt Doeink | PROCESS FOR CLOSING LIGNOCELLULESIC MATERIALS AFTER THE BISULFIT PROCESS |
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 (en) * | 1985-09-25 | 1987-12-15 | Центральный научно-исследовательский институт бумаги | Pulp for making corrugated paper |
SU1696631A1 (en) * | 1989-06-26 | 1991-12-07 | Сибирский научно-исследовательский институт целлюлозы и картона | Solution for treating wood pulp |
-
1997
- 1997-04-28 PT PT101999A patent/PT101999B/en not_active IP Right Cessation
-
1998
- 1998-04-20 WO PCT/PT1998/000002 patent/WO1998049390A1/en active IP Right Grant
- 1998-04-20 EP EP98914170A patent/EP0977918B1/en not_active Expired - Lifetime
- 1998-04-20 US US09/403,864 patent/US20020153108A1/en not_active Abandoned
- 1998-04-20 DE DE69837755T patent/DE69837755T2/en not_active Expired - Fee Related
- 1998-04-20 AU AU68586/98A patent/AU738720B2/en not_active Ceased
- 1998-04-20 AT AT98914170T patent/ATE362010T1/en not_active IP Right Cessation
- 1998-04-20 BR BR9809423-8A patent/BR9809423A/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO9849390A1 * |
Also Published As
Publication number | Publication date |
---|---|
AU738720B2 (en) | 2001-09-27 |
DE69837755D1 (en) | 2007-06-21 |
DE69837755T2 (en) | 2008-01-31 |
BR9809423A (en) | 2000-06-13 |
WO1998049390A1 (en) | 1998-11-05 |
US20020153108A1 (en) | 2002-10-24 |
AU6858698A (en) | 1998-11-24 |
EP0977918B1 (en) | 2007-05-09 |
PT101999B (en) | 2003-09-30 |
ATE362010T1 (en) | 2007-06-15 |
PT101999A (en) | 1998-11-30 |
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