EP0977918B1 - 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 reagent Download PDFInfo
- 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
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 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)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PT10199997 | 1997-04-28 | ||
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 |
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 EP0977918A1 (en) | 2000-02-09 |
EP0977918B1 true 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 (pt) |
EP (1) | EP0977918B1 (pt) |
AT (1) | ATE362010T1 (pt) |
AU (1) | AU738720B2 (pt) |
BR (1) | BR9809423A (pt) |
DE (1) | DE69837755T2 (pt) |
PT (1) | PT101999B (pt) |
WO (1) | WO1998049390A1 (pt) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BR112013015190B1 (pt) * | 2010-12-15 | 2021-05-11 | Imperial Innovations Limited | método de tratamento de uma biomassa de lignocelulose para dissolver a lignina na mesma e processo de preparação de glicose a partir de uma biomassa de lignocelulose |
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 (pt) * | 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 |
-
1997
- 1997-04-28 PT PT101999A patent/PT101999B/pt not_active IP Right Cessation
-
1998
- 1998-04-20 WO PCT/PT1998/000002 patent/WO1998049390A1/en active IP Right Grant
- 1998-04-20 DE DE69837755T patent/DE69837755T2/de not_active Expired - Fee Related
- 1998-04-20 US US09/403,864 patent/US20020153108A1/en not_active Abandoned
- 1998-04-20 BR BR9809423-8A patent/BR9809423A/pt not_active IP Right Cessation
- 1998-04-20 AU AU68586/98A patent/AU738720B2/en not_active Ceased
- 1998-04-20 AT AT98914170T patent/ATE362010T1/de not_active IP Right Cessation
- 1998-04-20 EP EP98914170A patent/EP0977918B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0977918A1 (en) | 2000-02-09 |
AU6858698A (en) | 1998-11-24 |
ATE362010T1 (de) | 2007-06-15 |
BR9809423A (pt) | 2000-06-13 |
DE69837755T2 (de) | 2008-01-31 |
PT101999A (pt) | 1998-11-30 |
US20020153108A1 (en) | 2002-10-24 |
AU738720B2 (en) | 2001-09-27 |
WO1998049390A1 (en) | 1998-11-05 |
PT101999B (pt) | 2003-09-30 |
DE69837755D1 (de) | 2007-06-21 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
AU623465B2 (en) | Hydrogen peroxide bleaching process | |
JP2009516086A (ja) | 新しいパルプ及びパルプ化の方法 | |
PT1076132E (pt) | Processo de fabrico de uma folha de papel que inclui a fixação de uma carga mineral sobre fibras celulósicas | |
EP0977918B1 (en) | A wood delignification chemical process using ammonium magnesium bisulphite as the active reagent | |
SE461534B (sv) | Foerfarande foer framstaellning av kokvaetska samt kokvaetska foer kraftmassakokning | |
NO132149B (pt) | ||
US5449436A (en) | Bleaching of deinked paper/wood pulp | |
ES8704569A1 (es) | Procedimiento de disgregacion con sulfito para la preparacion de celulosa a partir de materiales que contienen lignocelulosa con recuperacion de los productos quimicos de disgregacion | |
BR9910873A (pt) | Processo para causticação de carbonato de sódio. | |
US4734161A (en) | Process for a two stage peroxide bleaching of pulp | |
FI73018B (fi) | Foerfarande foer delignifierande blekning av cellulosamassa. | |
US2528350A (en) | Two-step digestion of hardwoods | |
US2435566A (en) | Peroxide bleaching of ground wood | |
JPS6024875B2 (ja) | 木材パルプの改良酸素/アルカリ脱リグニン法 | |
US2956918A (en) | Chemically assisted mechanical wood pulp | |
US1894501A (en) | Manufacture of wood pulp | |
WO1994005851A1 (en) | Novel method of bleaching of lignocellulosic pulp using persulphate | |
JPH0215669B2 (pt) | ||
JP2001192991A (ja) | アルカリパルプの漂白方法 | |
GB1301031A (en) | Pulp and a process for the production thereof | |
US5330620A (en) | Bleaching pulp with chloric acid | |
US3929559A (en) | Stabilization of cellulosic material by treatment with ferricyanide ion | |
US2516664A (en) | Hypochlorite bleaching of ground wood | |
SU821616A1 (ru) | Способ отбелки древесной массы | |
US2834649A (en) | Manufacture of chlorine dioxide |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19991124 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT CH DE ES FI FR GB LI PT SE |
|
17Q | First examination report despatched |
Effective date: 20010514 |
|
APAF | Appeal reference modified |
Free format text: ORIGINAL CODE: EPIDOSCREFNE |
|
APBT | Appeal procedure closed |
Free format text: ORIGINAL CODE: EPIDOSNNOA9E |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT CH DE ES FI FR GB LI PT SE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20070509 Ref country code: FI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20070509 Ref country code: CH Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20070509 |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
REF | Corresponds to: |
Ref document number: 69837755 Country of ref document: DE Date of ref document: 20070621 Kind code of ref document: P |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20070820 |
|
REG | Reference to a national code |
Ref country code: SE Ref legal event code: TRGR |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
EN | Fr: translation not filed | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: PT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20071009 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed |
Effective date: 20080212 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20080104 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20080420 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20080420 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 20090407 Year of fee payment: 12 Ref country code: DE Payment date: 20090529 Year of fee payment: 12 Ref country code: AT Payment date: 20090408 Year of fee payment: 12 |
|
EUG | Se: european patent has lapsed | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: AT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20100420 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20101103 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20100421 |