EP2931968A1 - Utilisation de dithionite de sodium dans un processus de cuisson de cellulose - Google Patents

Utilisation de dithionite de sodium dans un processus de cuisson de cellulose

Info

Publication number
EP2931968A1
EP2931968A1 EP13805310.3A EP13805310A EP2931968A1 EP 2931968 A1 EP2931968 A1 EP 2931968A1 EP 13805310 A EP13805310 A EP 13805310A EP 2931968 A1 EP2931968 A1 EP 2931968A1
Authority
EP
European Patent Office
Prior art keywords
digestion
cooking
acid
salt
range
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
Application number
EP13805310.3A
Other languages
German (de)
English (en)
Other versions
EP2931968B1 (fr
Inventor
Stefan Erren
Dieter SCHÖNHABER
Martin Schachtl
Steffen Fischer
Christian Baeurich
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.)
BASF SE
Technische Universitaet Dresden
Original Assignee
BASF SE
Technische Universitaet Dresden
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 BASF SE, Technische Universitaet Dresden filed Critical BASF SE
Priority to PL13805310T priority Critical patent/PL2931968T3/pl
Priority to EP13805310.3A priority patent/EP2931968B1/fr
Publication of EP2931968A1 publication Critical patent/EP2931968A1/fr
Application granted granted Critical
Publication of EP2931968B1 publication Critical patent/EP2931968B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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
    • D21C11/08—Deodorisation ; Elimination of malodorous compounds, e.g. sulfur compounds such as hydrogen sulfide or mercaptans, from gas streams
    • 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
    • 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
    • D21C3/02—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
    • 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
    • D21C3/02—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
    • D21C3/022—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes in presence of S-containing compounds
    • 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
    • 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
    • D21C3/22—Other features of pulping processes
    • 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
    • D21C9/1089—Bleaching ; Apparatus therefor with reducing compounds with dithionites

Definitions

  • the present invention relates to a process for the production of cellulose from lignocellulosic material by means of sulphite digestion or sulphate pulping, as defined in the claims.
  • cellulose (herein and also referred to in the art as "pulp") from lignocellulosic material, such as wood, are known and described, for example, in U Ilmanns Enzyklopadie der ischen Chemie, 4th Edition, Volume 17, “Paper, Fiber Raw Materials ", Pp. 531-576, Verlag Chemie Weinheim, New York (1979).
  • the cellulose is obtained by chemical digestion processes from the lignocellulosic material, such as wood.
  • chemical digestion methods are, for example, the sulfite pulping used for this purpose or the likewise known sulfate exclusion. Sulphite digestion and sulphate digestion are described, for example, in the above-cited Ullmann literature.
  • lignocellulosic material in both of the above processes is treated as follows to recover cellulose.
  • lignocellulosic material usually wood
  • acidic or neutral medium in the presence of sulphites (salts of sulphurous acid H2SO3)
  • sulphites salts of sulphurous acid H2SO3
  • cooking acid so-called cooking acid
  • magnesium in the form of magnesium oxide (MgO) is used as base which is then converted to dihydrogen sulfite.
  • acidic bisulfite digestion can also cause calcium (Ca), sodium (Na) or Ammonium (NH4) + can be used as a base for the cooking solution, which are then used analogously to magnesium as corresponding oxides or hydroxides.
  • these metals can usually be used analogously, apart from calcium, also in bisulfite digestion.
  • the acid magnesium bisulfite process is the most widely used today.
  • lignocellulosic material usually coniferous wood such as spruce wood, also fir wood and the wood of Hemlocktanne in question.
  • coniferous wood such as spruce wood, also fir wood and the wood of Hemlocktanne in question.
  • deciduous species such as beech, poplar and birch are also suitable.
  • Spruce wood is preferred in the sulphite process.
  • the above-mentioned different types of processes of the sulfite process usually operate at pressures in the range of 0.1 to 10 bar and generally in certain pH ranges.
  • the acid Bisulfitauf gleich a) usually at a pH in the range of 2 to 3
  • the Bisulfitauf gleich b) usually at a pH in the range of 3 to 5
  • the neutral sulphite pulping c) usually at a pH in the range of 6 to 9
  • the alkalisulfite digestion d) usually at a pH of around 1 1.
  • the digestion temperatures differ in the sulfite process.
  • the temperature range of acid Bisulfitauf gleiches a) is usually at 120 ° C to 150 ° C
  • the bisulfite pulping b) usually at 150 ° C to 160 ° C
  • the sodium sulfite pulping c) or even the Alkalisulfitauf gleiches d ) usually at 160 ° C to 180 ° C.
  • the boiling acid of the sulphite process usually contains so-called free sulfur dioxide (SO2), which is present as SO2 and sulphurous acid (hereinafter also "H2SO3") and bound SO2, which is bound to a cation (base) Free SO2 and bound SO2 are in the Generally indicated as total SO 2.
  • the cooking acid of the sulphite process is generally composed as follows: of these, the H2SO3 and the SO2 are assigned to the free SO2 and the M2SO3 to the bound SO2.
  • M is the respective so-called base, example magnesium.
  • the proportion of the base and the SO2 in the cooking acid is given in percent by weight.
  • a cooking acid with a total S02 content of 80 g per liter contains 8% total SO2.
  • the base portion is represented as their respective oxide form such as MgO, CaO, Na 2 O.
  • the preparation of a cooking acid is usually carried out by absorption of SO 2 to water and base carrier.
  • the following equation is intended to serve as an example of the principle of Kochklareher ein the BisulfitaufInstitutes with magnesium as the base (magnesium bisulfite).
  • cellulose is usually made from lignocellulose-containing material, for example, the wood of trees or even of annual plants, for example reeds, grain (straw), sugar cane (bagasse) , Corn won.
  • woodchips of the lignocellulose-containing material for example wood or comminuted plant stems
  • pressure vessels for several hours, for example 3 to 6 hours, at elevated pressure, for example in the range from 7 to 10 bar, usually in a mixture of sodium hydroxide solution (aqueous NaOH ), Sodium sulfide
  • Na 2 S sodium sulfate
  • Na 2 CO 3 optionally sodium carbonate
  • black liquor soluble alkali lignin
  • Cellulose can be separated from lignin with the abovementioned sulphite and sulphate processes, although it is still desirable to increase the pulp yield, in particular while at the same time keeping the lignin content of the pulp low.
  • the kappa number is a measure of the lignin content of the pulp.
  • pulp components
  • pulp mainly hemicelluloses
  • a disadvantage of pulping by the sulphate process is the formation of malodorous substances such as mercaptans, in particular methylmercaptan.
  • the addition of sodium dithionite (hereinafter also "Na 2 S 2 O 4”) in the pulp production process is basically known from the following literature.
  • G. G. Jayme and Woerner describe an alkaline sulfite pulping of spruce wood at 170 ° C, 24 hours, in 100 cm 3 of the digestion solution 3 g NaOH, 1, 56 g of sodium dithionite (Na2S20 4) and 4.69 g of Na2S03 were included.
  • G. Jayme, G. Wörner, paper, Volume 6, Issue 1 1, p 220-222 (1952) In it, relatively large amounts of sodium dithionite, based on the wood to be treated, are described indirectly by means of the quantity of chemicals and the "lye ratio" (p. 221, left-hand column “Zahlentafel" and the subsequent paragraph).
  • the object of the present invention was to obtain a high pulp yield with a simultaneous low lignin content of the pulp in the digestion of lignocellulose-containing material, wherein the formation of malodorous emissions in particular in the sulphate process should be reduced.
  • Lignocellulosic material herein is any material, preferably from nature, containing lignin and cellulose.
  • Preferred lignocellulose-containing material are woods, including shredded woods, such as wood sections from sawmills. Suitable woods are softwoods, preferably spruce or pine or hardwoods such as beech.
  • lignocellulose-containing material is understood here to include grasses and annual plants, for example straw, reed, esparto grass, bamboo and bagasse, these usually not being digested by the sulphite process but preferably by alkaline digestion or the neutral sulphite process.
  • Sulphite pulping and sulphate pulping for the recovery of cellulose are known and are described in the beginning and in more detail in Ullmanns Enzyklopadie der ischen Chemie, 4th Edition, Volume 17, “Paper, Fiber Raw Materials", Verlag Chemie Weinheim, New York (1979) pp. 535-549 in chapter 1.4].
  • Salts of dithionic acid herein are all metal salts or substituted (NFV) or unsubstituted (NhV) ammonium salts of this acid.
  • Highly suitable salts of the dithionic acid are the alkali metal salts, alkaline earth metal salts, salts of the metals of group 12 of the Periodic Table of the Elements, and ammonium (NH 4 + ) salts.
  • Preferred salts of the dithionic acid are sodium dithionite (Na 2 S 2 O 4), potassium dithionite (K 2 S 2 O 4), calcium dithionite (CaS 2 O 4 ), zinc dithionite (ZnS 2 O 4 ), ammonium dithionite ((NhU) C).
  • Salts of dithionic acid including those preferred above, of course also include those individuals containing water of crystallization and / or additives, the latter for example for stabilization.
  • a well-suited dithionic acid salt is the sodium dithionite product, which is marketed by BASF SE as Blankit® or Blankit®S.
  • the digestion temperature in sulfite digestion is usually in the range of 100 ° C to 160 ° C.
  • a suitable sulphite digestion for the process according to the invention is the bisulphite process with Mg (HSC "3) 2 as a component of the cooking acid, which is described in more detail below.
  • Mg HSC "3) 2
  • lignocellulose-containing material coniferous woods, preferably spruce wood, are preferably used as woodchips
  • the amount used is calculated as dry matter (otro), in order to be able to determine, for example, the yield of pulp
  • MgCO-3 "MgCO-3" in the water and then introducing SO 2.
  • the introduction of SO 2 is usually carried out until a clear solution has formed which has a pH value for example, of about 3.8. Usually, approximately the entire dissolved substance is present as Mg (HSO) 2.
  • the pH would continue to decrease as the proportion of sulphurous acid increases.
  • the cooking of the so-called lignocellulosic material with the cooking acid takes place in the usual digesters, discontinuous or continuous. The total cooking time is in the range of 400 to 600 minutes.
  • a temperature profile is used for cooking in the bisulfite process referred to herein, preferably the bisulfite process with Mg (HSOs) 2 as a component of the cooking acid.
  • a well-suited temperature profile is as follows. 1 . Phase: Heating from a temperature in the range of 15 ° C to 30 ° C to a temperature in the range of 100 to 1 10 ° C, within 60 to 120 minutes.
  • 2nd phase Stability for 60 to 90 minutes at a temperature in the range of
  • 3rd phase heating up from a temperature in the range of 100 to 1 10 ° C, up to a temperature in the range of 150 to 160 ° C, within 45 to 90 minutes.
  • 5th phase Cooling to a temperature in the range of 100 to 90 ° C.
  • the salt of dithionous acid preferably sodium dithionite (Na2S20 4) Calciumdithionit (CaS20 4), zinc dithionite (ZnS20 4), particularly preferably sodium dithionite, in the mixture of lignocellulosic material, preferably of wood chips from spruce wood, and the cooking acid, as described above in an amount in the range from 0.1 to 4.0% by weight, preferably from 1.0 to 2.0% by weight, based in each case on the oven-dried lignocellulose-containing material, preferably the oven-dried wood chips from spruce wood.
  • the dosage of the salt of the dithionic acid at any time during the cooking process or before it happen.
  • the following dosage variants are preferred:
  • lignocellulosic material are woods, such as deciduous or preferably coniferous wood, particularly preferably spruce wood, preferably used as wood chips.
  • the mixture known for the sulphate process from sodium hydroxide solution (aqueous NaOH), sodium sulphate (Na 2 S) and sodium sulphate (hereinafter also “Na 2 SO 4") and optionally sodium carbonate (hereinafter also “Na 2 CO 3”), which contains the salt the dithionic acid, preferably selected from the group consisting of sodium dithionite, zinc dithionite, calcium dithionite, in an amount in the range of 0.1 to 4 wt .-% based on the amount of oven-dry lignocellulose-containing material was added.
  • sodium hydroxide solution aqueous NaOH
  • Na 2 S sodium sulphate
  • Na 2 SO 4 sodium sulphate
  • Na 2 CO 3 optionally sodium carbonate
  • the cooking liquor for sulphate pulping usually contains NaOH and sodium sulphide (Na2S) as effective cooking chemicals.
  • NaOH sodium sulphide
  • the necessary concentration of these substances in the cooking liquor is usually dependent on the so-called "liquor ratio.”
  • this liquor ratio is understood as meaning mass fractions of cooking liquor in relation to mass fractions of lignocellulose-containing material, preferably wood (oven-dry (otro)) usually depending on the filling density of wood in the digester, generally in the range from 4: 1 to 4.5: 1, for example 4.2: 1.
  • the concentration of active alkali in the cooking liquor is in the range from 45 to 60 g / l.
  • the content of sodium sulfide (Na2S) in the total effective alkali is the sulfidity (expressed in%). This is usually in the range of 30 to 38%, for example 30%.
  • the cooking liquor for the sulphate process according to the invention contains a salt of the dithionic acid, preferably selected from the group consisting of sodium dithionite, zinc dithionite, calcium dithionite, in an amount in the range from 0.1 to 4% by weight, based on the amount of oven-dried lignocellulose-containing Material.
  • a salt of the dithionic acid preferably selected from the group consisting of sodium dithionite, zinc dithionite, calcium dithionite, in an amount in the range from 0.1 to 4% by weight, based on the amount of oven-dried lignocellulose-containing Material.
  • the pH of the cooking liquor for the sulphate process according to the invention is usually about 14 at the beginning of the cooking process.
  • the cooking of the lignocellulosic material with the cooking liquor for the sulfate process according to the invention takes place in the usual digesters discontinuous or continuous.
  • the total cooking time for the sulfate process of the invention is usually in the range of 200 to 400 minutes, preferably 240 to 300 minutes.
  • the boiling temperature for the sulfate process of the invention is in the range of 160 to 185 ° C, for example at 170 ° C.
  • the salt of the dithionic acid preferably selected from the group consisting of sodium dithionite, zinc dithionite, calcium dithionite, more preferably sodium dithionite, is used in the sulphate process of the invention for mixing the lignocellulosic material and the cooking liquor in an amount ranging from 0.1 to 4.0 wt. %, preferably 1.0 to 2.0% by weight, based in each case on the oven-dried lignocellulose-containing material.
  • the dosage of the salt of the dithionic acid can be done at any time during the cooking process of the sulphate process according to the invention.
  • the salt of the dithionic acid is preferably added in the impregnation phase, the final phase of the digestion or in the main phase of the digestion of the sulphate process according to the invention, particularly preferably in the final phase of the digestion or in the main phase of the digestion of the sulphate process according to the invention.
  • the process according to the invention for the production of cellulose from lignocellulose-containing material by means of sulfite pulping or sulfate pulping produces pulp in good yield with good delignification of the lignocellulose-containing material. The whiteness of the unbleached pulp is improved.
  • the addition of a salt of the dithionic acid in the sulfate process of the invention reduces the concentration of malodorous substances, preferably mercaptans in the exhaust gas of the sulfate cooking process. Examples
  • Spruce wood chips pre-sorted and pre-dried in the room air for 2 to 3 days before cooking water content in the range of 23.4 to 33.2 wt .-%, on average about 30 wt .-%
  • 3200 g (oven-dry (otro) calculated) spruce chips with an original water content as described in A) and 16 liters of the cooking acid from B) were filled in the discontinuous cooker with a capacity of 25 liters, according to a quantitative ratio of cooking acid: otro wood of 5: 1.
  • the cooker had an acid circulation and electric jacket heating as well as a temperature controller, manometer, temperature sensor and pH electrode, as well as connected EDP system.
  • 3rd phase 60 min heating-up time from 105 ° C to final cooking temperature 155 ° C
  • the total digestion time was 510 min (8 h 30 min).
  • the pressure in the digester was 8 to 9 bar at the end of the final cooking time.
  • Sodium dithionite (Blankit®S from BASF SE) was dissolved in water by metering pump within 10 min in the digester added to the mixture and that 32 g of pure Na2S20 4 (1 wt .-% Na2S20 4 based on otro counted wood used) or 64 g pure Na2S20 4 (2 wt .-% Na2S20 4 based on used otro counted wood).
  • Sodium dithionite addition times were, per experiment, as follows:
  • experiment W 16 the chips were impregnated immediately before digestion with such an amount of aqueous solution of sodium dithionite (Blankit®S BASF SE), corresponding to 1 wt .-% pure Na 2 S 20 4 based on otro computed timber used.
  • the pulp was removed, mixed with water and defibered with a stirrer. The shredded pulp was filled into a sieve, washed with water and dehydrated in a centrifuge.
  • Acceptance of raw material means amount of pulp received (without coarse or splinter content) in relation to the wood used; It was determined by weighing and dry content measurement.
  • the kappa number indicates the hardness of the pulp and was determined in accordance with ISO 302. Put simply, when determining the kappa number in an aqueous pulp suspension in an acidic medium under defined conditions, the potassium permanganate consumption (KMnCM consumption) is measured. The higher the lignin content in the pulp, the higher the consumption of potassium permanganate and thus the kappa number. The higher the kappa number, the higher the residual lignin content of the pulp, the harder is the pulp in general.
  • Whiteness means remission at 457 nm and was determined on the Datacolor Elrepho® instrument according to ISO 2470.
  • the viscosity determination was carried out according to ISO 5351/1 (International Standard ISO 5351/1, Cellulose in dilute Solutions - Determination of liming viscosity number, Part 1: Method in cupri-ethylene-diamine (CED) Solution, First edition 1981 -12 -01).
  • ISO 5351/1 International Standard ISO 5351/1, Cellulose in dilute Solutions - Determination of liming viscosity number, Part 1: Method in cupri-ethylene-diamine (CED) Solution, First edition 1981 -12 -01.
  • a solution of cellulose in copper ethylenediamine solution is prepared.
  • the concentration of the solvent is fixed.
  • the concentration of cellulose in the solution should be determined according to the sample used in the determination.
  • the throughput time of both the solvent and the cellulose solution is measured by a capillary viscometer at 25 ° C.
  • the calculation of the intrinsic viscosity is based on the results of the determination and the known concentration of the cellulose solution according to the Martin equation.
  • the measurement was carried out according to the alternative A of the determination method (International Standard ISO 5351/1, Cellulose in dilute Solutions - Determination of liming viscosity number, Part 1: Method in cupri-ethylene-diamine (CED) Solution, First edition 1981 -12 -01). It is carried out at low cellulose concentration and used for the measurement of the transit times of solvent and cellulose solution, the same capillary.
  • Lignocellulose-containing material A) Lignocellulose-containing material:
  • the cooking liquor was prepared by adding commercial laboratory chemicals in water from caustic soda (NaOH) and sodium sulfide (Na2S). The amount of chemicals used was calculated so that an alkali ratio of 23% was used at a sulphidity of 20%.
  • Table 4 shows the yield of the accepts and the kappa number. Table 4: Cooking No. Auxiliary agent addition [1] Acceptance of raw material% Kappa number
  • Acceptance yield and kappa number are as defined under (I) above.
  • exhaust gases gases from the digester
  • exhaust samples were taken at different times with a tracer pump
  • concentration of methylmercaptan in these samples was measured with methylmercaptan-specific gas detector tubes.
  • the methylmercaptan concentration is highest.
  • the use of Na2S20 4 leads to a decrease of the methyl mercatane in the exhaust gas.

Abstract

L'invention concerne un procédé de fabrication de cellulose à partir de matière contenant de la lignocellulose par désagrégation de sulfite ou désagrégation de sulfate en présence d'un sel de l'acide dithionique, caractérisé en ce que le sel de l'acide dithionique est utilisé dans une quantité de l'ordre de 0,1 à 4,0 % en poids par rapport à la quantité de matière contenant de la lignocellulose séchée au four.
EP13805310.3A 2012-12-12 2013-12-02 Utilisation de dithionite de sodium dans un processus de cuisson de cellulose Active EP2931968B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL13805310T PL2931968T3 (pl) 2012-12-12 2013-12-02 Zastosowanie ditioninu sodu w sposobie warzenia masy celulozowej
EP13805310.3A EP2931968B1 (fr) 2012-12-12 2013-12-02 Utilisation de dithionite de sodium dans un processus de cuisson de cellulose

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP12196636 2012-12-12
PCT/EP2013/075193 WO2014090609A1 (fr) 2012-12-12 2013-12-02 Utilisation de dithionite de sodium dans un processus de cuisson de cellulose
EP13805310.3A EP2931968B1 (fr) 2012-12-12 2013-12-02 Utilisation de dithionite de sodium dans un processus de cuisson de cellulose

Publications (2)

Publication Number Publication Date
EP2931968A1 true EP2931968A1 (fr) 2015-10-21
EP2931968B1 EP2931968B1 (fr) 2018-10-31

Family

ID=47355871

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13805310.3A Active EP2931968B1 (fr) 2012-12-12 2013-12-02 Utilisation de dithionite de sodium dans un processus de cuisson de cellulose

Country Status (18)

Country Link
EP (1) EP2931968B1 (fr)
JP (1) JP6290244B2 (fr)
KR (1) KR20150093825A (fr)
CN (1) CN104838065A (fr)
AR (1) AR093929A1 (fr)
AU (1) AU2013357649B2 (fr)
BR (1) BR112015013578B1 (fr)
CA (1) CA2892725A1 (fr)
CL (1) CL2015001406A1 (fr)
ES (1) ES2708216T3 (fr)
MX (1) MX2015007586A (fr)
PH (1) PH12015501255A1 (fr)
PL (1) PL2931968T3 (fr)
PT (1) PT2931968T (fr)
RU (1) RU2649301C2 (fr)
TW (1) TWI607041B (fr)
WO (1) WO2014090609A1 (fr)
ZA (1) ZA201504934B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021058483A1 (fr) * 2019-09-23 2021-04-01 Université Catholique de Louvain Procédé de production de composants de lignine à partir de biomasse lignocellulosique

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112900130B (zh) * 2021-02-02 2022-08-12 大连工业大学 一种减少植物纤维蒸煮后白度下降的方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE912169C (de) * 1952-02-22 1954-05-24 Georg Jayme Dr Ing Verfahren zum alkalischen Aufschluss von Pflanzenstoffen
FR1150451A (fr) * 1956-05-04 1958-01-14 Saint Gobain Perfectionnement aux procédés de fabrication des pâtes cellulosiques mi-chimiques
FR2615874B1 (fr) * 1987-05-25 1992-02-21 Atochem Procede de preparation de pates chimicothermomecaniques
EP2061927A2 (fr) * 2006-05-19 2009-05-27 The Research Foundation of the State University of New York Procédés de prétraitement au carbonate et de réduction en pâte de matière cellulosique
US20080105392A1 (en) * 2006-11-03 2008-05-08 Duggirala Prasad Y Method and composition for improving fiber quality and process efficiency in mechanical pulping
US20090090478A1 (en) * 2007-10-05 2009-04-09 Hollomon Martha G Selectivity improvement in oxygen delignification and bleaching of lignocellulose pulp using singlet oxygen
RU2011144375A (ru) * 2009-04-02 2013-05-10 Оберн Юниверсити Способ варки целлюлозы для повышения выхода и качества, включающий способы экстракции гемицеллюлозы и обработки лигноцеллюлозных материалов после экстракции гемицеллюлозы

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2014090609A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021058483A1 (fr) * 2019-09-23 2021-04-01 Université Catholique de Louvain Procédé de production de composants de lignine à partir de biomasse lignocellulosique

Also Published As

Publication number Publication date
CL2015001406A1 (es) 2016-02-05
TW201428031A (zh) 2014-07-16
AR093929A1 (es) 2015-07-01
PL2931968T3 (pl) 2019-04-30
CA2892725A1 (fr) 2014-06-19
ES2708216T3 (es) 2019-04-09
CN104838065A (zh) 2015-08-12
PH12015501255A1 (en) 2015-08-17
WO2014090609A1 (fr) 2014-06-19
TWI607041B (zh) 2017-12-01
AU2013357649B2 (en) 2017-06-08
MX2015007586A (es) 2016-05-05
KR20150093825A (ko) 2015-08-18
ZA201504934B (en) 2017-11-29
PT2931968T (pt) 2019-01-11
BR112015013578A2 (pt) 2017-08-15
RU2015127891A (ru) 2017-01-19
RU2649301C2 (ru) 2018-03-30
JP2015537130A (ja) 2015-12-24
JP6290244B2 (ja) 2018-03-07
EP2931968B1 (fr) 2018-10-31
BR112015013578B1 (pt) 2021-07-06
AU2013357649A1 (en) 2015-06-11

Similar Documents

Publication Publication Date Title
DE2640027C2 (fr)
DE2027319C3 (de) Verfahren zur Herstellung von chemisch gut loslichem Zellstoff
DE2818320A1 (de) Verfahren zur behandlung von holzhackschnitzeln
DE102006027006A1 (de) Verfahren zum Herstellen von Faserstoff aus Holz
DE2246647A1 (de) Verfahren zur fraktionierten gewinnung von lignin und cellulose aus baumrinde bzw. borke
DE2920731C2 (de) Lignocelluloseaufschlußverfahren mit einem Gemisch von Wasser und niedrig molekularem aliphatischem Alkohol und Metallsalz
EP2931968B1 (fr) Utilisation de dithionite de sodium dans un processus de cuisson de cellulose
WO2000034568A1 (fr) Procede de preparation de pate a usage chimique a partir de copeaux de bois
DE2755768A1 (de) Verfahren zur delignifizierung von lignocellulose-materialien
US2065395A (en) Fractured wood fiber product
DE3115922A1 (de) Verfahren zur herstellung von alkalischer sulfitmasse
DD147259A5 (de) Verfahren zur chemischen umwandlung von lignocellulose
DE102007008955A1 (de) Verfahren zum Herstellen von Faserstoff aus Holz
US9121135B2 (en) Use of sodium dithionite in pulping
DE1815383C3 (de) Verfahren zur Herstellung von Holzstoffmassen
DE2333742C3 (de) Verfahren zur Herstellung von Zellulosepulpen
DE2537785A1 (de) Verfahren zum sulfit-kochen von holz
AT116059B (de) Verfahren zur Herstellung hochwertiger Faserhalbstoffe.
DE1298405B (de) Verfahren zur Herstellung von Zellstoff aus lignozellulosehaltigem Material
DE1811605A1 (de) Verfahren zum Kochen von celluloseartigem Rohmaterial und so hergestellte Holzstoffmassen
WO1994020670A1 (fr) Production de materiaux ligneux chimiomecaniques et/ou chimiothermomecaniques
DE2226589A1 (de) Verfahren zur Herstellung von Zellstoff und erhöhtem Weißgrad aus ligninhaltigen Celhilosematerialien
DE2333742B2 (de) Verfahren zur Herstellung von Zellulosepulpen
WO2011127999A1 (fr) Procédé de préparation d'une matière fibreuse de bois
DE1151431B (de) Verfahren zur Herstellung von Zellstoff aus cellulosehaltigen! Rohstoff

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: 20150713

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAX Request for extension of the european patent (deleted)
17Q First examination report despatched

Effective date: 20170822

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

INTG Intention to grant announced

Effective date: 20180606

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): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 1059533

Country of ref document: AT

Kind code of ref document: T

Effective date: 20181115

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 502013011507

Country of ref document: DE

REG Reference to a national code

Ref country code: PT

Ref legal event code: SC4A

Ref document number: 2931968

Country of ref document: PT

Date of ref document: 20190111

Kind code of ref document: T

Free format text: AVAILABILITY OF NATIONAL TRANSLATION

Effective date: 20181231

REG Reference to a national code

Ref country code: SE

Ref legal event code: TRGR

REG Reference to a national code

Ref country code: NL

Ref legal event code: FP

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

REG Reference to a national code

Ref country code: NO

Ref legal event code: T2

Effective date: 20181031

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2708216

Country of ref document: ES

Kind code of ref document: T3

Effective date: 20190409

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IS

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: 20190228

Ref country code: LV

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: 20181031

Ref country code: HR

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: 20181031

Ref country code: LT

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: 20181031

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: RS

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: 20181031

Ref country code: GR

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: 20190201

Ref country code: AL

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: 20181031

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CZ

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: 20181031

Ref country code: DK

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: 20181031

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 502013011507

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: RO

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: 20181031

Ref country code: SK

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: 20181031

Ref country code: EE

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: 20181031

Ref country code: SM

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: 20181031

Ref country code: MC

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: 20181031

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20181202

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

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20190131

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20181231

26N No opposition filed

Effective date: 20190801

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 NON-PAYMENT OF DUE FEES

Effective date: 20181231

Ref country code: SI

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: 20181031

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20181202

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20181231

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: 20190131

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MT

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: 20181031

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

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: 20181031

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20131202

Ref country code: CY

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: 20181031

Ref country code: MK

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20181031

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20201222

Year of fee payment: 8

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

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 NON-PAYMENT OF DUE FEES

Effective date: 20211231

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20211231

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20220527

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: PL

Payment date: 20221116

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20230118

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20231222

Year of fee payment: 11

Ref country code: PT

Payment date: 20231113

Year of fee payment: 11

Ref country code: NO

Payment date: 20231219

Year of fee payment: 11

Ref country code: NL

Payment date: 20231226

Year of fee payment: 11

Ref country code: IT

Payment date: 20231221

Year of fee payment: 11

Ref country code: FI

Payment date: 20231228

Year of fee payment: 11

Ref country code: BG

Payment date: 20231220

Year of fee payment: 11

Ref country code: AT

Payment date: 20231219

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: PL

Payment date: 20231108

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20240118

Year of fee payment: 11