WO1995023256A1 - Procede de production et d'utilisation de produits chimiques supplementaires destines a la reduction en pate dans un procede du type kraft - Google Patents
Procede de production et d'utilisation de produits chimiques supplementaires destines a la reduction en pate dans un procede du type kraft Download PDFInfo
- Publication number
- WO1995023256A1 WO1995023256A1 PCT/FI1995/000089 FI9500089W WO9523256A1 WO 1995023256 A1 WO1995023256 A1 WO 1995023256A1 FI 9500089 W FI9500089 W FI 9500089W WO 9523256 A1 WO9523256 A1 WO 9523256A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pulping
- liquor
- compounds
- sulphur
- cooking
- Prior art date
Links
- 238000004537 pulping Methods 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 62
- 230000008569 process Effects 0.000 title claims abstract description 36
- 239000000126 substance Substances 0.000 title claims abstract description 25
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims abstract description 25
- 238000011084 recovery Methods 0.000 claims abstract description 17
- 150000001875 compounds Chemical class 0.000 claims abstract description 15
- 150000003568 thioethers Chemical class 0.000 claims abstract description 8
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 48
- 239000005864 Sulphur Substances 0.000 claims description 37
- 238000006243 chemical reaction Methods 0.000 claims description 28
- 239000007789 gas Substances 0.000 claims description 28
- 238000010411 cooking Methods 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 19
- LSDPWZHWYPCBBB-UHFFFAOYSA-N Methanethiol Chemical compound SC LSDPWZHWYPCBBB-UHFFFAOYSA-N 0.000 claims description 13
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims description 12
- WQOXQRCZOLPYPM-UHFFFAOYSA-N dimethyl disulfide Chemical compound CSSC WQOXQRCZOLPYPM-UHFFFAOYSA-N 0.000 claims description 11
- 229920001021 polysulfide Polymers 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims description 7
- -1 dimethyl disulphide Chemical class 0.000 claims description 6
- 238000004064 recycling Methods 0.000 claims description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 4
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 4
- 239000004571 lime Substances 0.000 claims description 4
- 239000007791 liquid phase Substances 0.000 claims description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 2
- 238000009833 condensation Methods 0.000 claims description 2
- 230000005494 condensation Effects 0.000 claims description 2
- 230000009467 reduction Effects 0.000 claims description 2
- 235000010269 sulphur dioxide Nutrition 0.000 claims description 2
- 239000004291 sulphur dioxide Substances 0.000 claims description 2
- 239000001117 sulphuric acid Substances 0.000 claims description 2
- 235000011149 sulphuric acid Nutrition 0.000 claims description 2
- 239000002655 kraft paper Substances 0.000 abstract description 17
- 230000008901 benefit Effects 0.000 abstract description 5
- 239000003265 pulping liquor Substances 0.000 abstract description 3
- 150000002500 ions Chemical class 0.000 description 20
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 15
- VLXBWPOEOIIREY-UHFFFAOYSA-N dimethyl diselenide Natural products C[Se][Se]C VLXBWPOEOIIREY-UHFFFAOYSA-N 0.000 description 9
- HYHCSLBZRBJJCH-UHFFFAOYSA-M sodium hydrosulfide Chemical compound [Na+].[SH-] HYHCSLBZRBJJCH-UHFFFAOYSA-M 0.000 description 9
- 230000029087 digestion Effects 0.000 description 8
- 229920005610 lignin Polymers 0.000 description 8
- 238000010520 demethylation reaction Methods 0.000 description 7
- 239000006096 absorbing agent Substances 0.000 description 6
- 238000001704 evaporation Methods 0.000 description 6
- 230000008020 evaporation Effects 0.000 description 6
- 230000017858 demethylation Effects 0.000 description 5
- QMMFVYPAHWMCMS-UHFFFAOYSA-N Dimethyl sulfide Chemical compound CSC QMMFVYPAHWMCMS-UHFFFAOYSA-N 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 229910010272 inorganic material Inorganic materials 0.000 description 3
- GRVDJDISBSALJP-UHFFFAOYSA-N methyloxidanyl Chemical group [O]C GRVDJDISBSALJP-UHFFFAOYSA-N 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- QSLPNSWXUQHVLP-UHFFFAOYSA-N $l^{1}-sulfanylmethane Chemical compound [S]C QSLPNSWXUQHVLP-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 241000779819 Syncarpia glomulifera Species 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 150000002484 inorganic compounds Chemical class 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001739 pinus spp. Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 description 2
- 238000007669 thermal treatment Methods 0.000 description 2
- 229940036248 turpentine Drugs 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-M hydrosulfide Chemical compound [SH-] RWSOTUBLDIXVET-UHFFFAOYSA-M 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000012978 lignocellulosic material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000269 nucleophilic effect Effects 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052979 sodium sulfide Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- D21C3/02—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
- D21C11/00—Regeneration of pulp liquors or effluent waste waters
- D21C11/0064—Aspects concerning the production and the treatment of green and white liquors, e.g. causticizing green liquor
- D21C11/0071—Treatment of green or white liquors with gases, e.g. with carbon dioxide for carbonation; Expulsion of gaseous compounds, e.g. hydrogen sulfide, from these liquors by this treatment (stripping); Optional separation of solid compounds formed in the liquors by this treatment
-
- 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
- D21C3/22—Other features of pulping processes
- D21C3/222—Use of compounds accelerating the pulping processes
Definitions
- the present invention concerns a favourable modification of the kraft pulping and chemical recovery processes.
- non-traditional pulping chemicals are generated on site and used in addition to the traditional kraft pulping chemicals.
- the present invention has two main objects. Firstly, the said additional pulping chemicals enhance the pulping process itself. Secondly, the process for recovering and reusing the spent pulping chemicals is significantly more flexible than the conventional kraft chemical recovery process.
- lignocellulosic material such as wood
- a liquor containing, as main components, the active pulping chemicals sodium hydroxide (NaOH) and sodium hydrosulphide (NaHS).
- the spent pulping liquor known as black liquor
- black liquor is washed from the pulp, concentrated by evaporation and combusted in the chemical recovery boiler.
- the heat released through combustion of the black liquor organic material is recovered as steam while the inorganic material is converted into salts, mainly sodium carbonate (Na 2 C0 3 ) and sodium sulphide (Na 2 S) .
- the so-called white liquor containing the above mentioned active pulping agents as main components, is prepared from these salts.
- MM dissociates to form methyl mercaptide ion, CH 3 S " .
- This ion is considerably more nucleophilic than hydrosulphide ion, HS " , and, in principle. would be more effective than hydrosulphide in increasing the rate of delignification during pulping.
- kraft pulping is, in fact, enhanced by the addition of organic sulphide compounds, including MM. More specifically, higher pulp yields, at the same residual lignin content, can be achieved without detrimental effects on the pulp physical properties. To achieve these results at least 10 % of the total effective sulphidity should be due to the added organic sulphides.
- Ohara S.
- the present invention is a novel and elegant method of improving the kraft pulping and chemical recovery processes.
- the method eliminates the drawbacks of the prior art concerning the use of organic sulphides in kraft pulping.
- the method encompasses:
- the key feature of the novel concept is that organic sulphur compounds which can enhance pulping are generated in considerable quantities on site. Examples of the amounts of methyl mercaptide ion which can be fed to the digester in a steady-state situation will be given below.
- the new concept represents a significant improvement to the prior art where the only method proposed for obtaining organic sulphur compounds on site was the recycling of compounds formed during the pulping process itself.
- the amounts of active compounds, such as MM, which can be generated on a steady-state basis during pulping, are much lower lower than those required to significantly benefit pulping.
- the effective sulphidities of cooking liquors can be conveniently adjusted by directly absorbing different amounts of MM into the liquors.
- the level of methyl mercaptide ion in the cooking liquor can be reduced during the pulping sequence by a temporary reduction in pressure.
- the new method also opens the way for close coupling of the pulping and black liquor heat treatment processes. For example, heat, as well as active pulping chemicals, can be conveniently transferred from the black liquor heat treatment stage to the pulping stage. This convenient transfer is possible because the sulphur gases released in heat treatment are directly contacted with white liquor or cooking liquor. Contacting with cooking liquor can even be performed within the digester itself. Prior conversion of sulphur gases into other compounds, as outlined, for example, in Finnish patent application 916097, is not required. In some embodiments of the present invention conversion of volatile sulphur compounds into other compounds, such as NaHS or inorganic polysulphides, is necessary and/or desirable. In particular, DMS, which is not significantly absorbed into alkaline solution, is available for this purpose.
- sulphur dioxide S0 2
- the lime kiln and, if installed, the odour gas incinerator could be used for this purpose.
- sulphur-containing chemicals such as sulphuric acid
- sulphur-containing chemicals such as sulphuric acid
- One possibility is to first combust the gases in an on- site furnace, such as the lime kiln or the odour gas incinerator, and then to convert the S0 2 so formed into the required chemical. This option would help some mills to reduce sulphidity levels without increasing emissions of sulphur compounds to the environment.
- Inorganic polysulphides which can be produced from sulphur gases as outlined in Finnish patent application 916097, enhance kraft pulping. Because of several striking analogies between the behaviour of inorganic polysulphides and that of organic polysulphides, it is probable that DMDS, an organic polysulphide, enhances kraft pulping in a similar fashion to inorganic polysulphides. DMDS is more easily absorbed or condensed into white liquor or cooking liquor than is DMS. However, during black liquor heat treatment, DMDS is formed to a much lesser extent than either MM or DMS. On the other hand, if desired, methyl mercaptide ion can be readily oxidized into
- DMDS methyl mercaptide ion and DMDS.
- Block 1 encompasses digestion, digester blow and/or relief, and black liquor separation from the pulp (pulp washing).
- the weak black liquor stream 2 is led to the evaporator 3.
- the black liquor stream 4 is diverted to the black liquor heat treatment process 5 where it is heated in the liquid phase to a temperature higher than the pulping temperature, for example 200 - 300°C, and held at that temperature for a time of 5 - 60 min. Elevated pressure is used to prevent excessive vapourization of water during the treatment. Volatile sulphur compounds, in particular MM and DMS, are formed and exit the process as stream 7.
- the ratio of MM to DMS in stream 7 is dependent, in part, on the process conditions applied in the heat treatment step. For example, the MM/DMS ratio will tend to increase when the operating pressure is decreased.
- the heat-treated liquor, stream 6, is returned to the evaporator 3 for further concentration by evaporation.
- the concentrated black liquor stream 8 exiting the evaporator is led to block 9 which encompasses the recovery furnace, or alternative black liquor conversion reactor, and affiliated processes.
- Stream 10 comprises the inorganic compounds formed in the conversion process.
- white liquor is prepared in the conventional way from the components of stream 10.
- the white liquor stream 12 contains, as main components, the active pulping agents NaOH and NaHS.
- NCG concentrated non-condensable gas
- these streams typically contain other organic compounds such as methanol (CH 3 0H) and turpentine, as well as significant quantities of air-derived oxygen (0 2 ) and nitrogen (N 2 ) .
- CH 3 0H methanol
- N 2 nitrogen
- methyl mercaptide ion is used in measurable quantities as an additional pulping agent, the amounts of sulphur gases released after pulping are greater than those released in the conventional kraft process. In particular, the amounts of MM and DMS are greater.
- MM originates from unreacted methyl mercaptide ion while DMS is formed during pulping according to Reaction 2.
- sulphur gases that would normally be collected into the concentrated NCG system are collected into two separate streams: stream 13, containing significant amounts of air-derived oxygen (0 2 ) and nitrogen (N 2 ), and stream 14, containing only minor amounts of such components.
- the air-lean sulphur gas stream 14 is combined to the sulphur gas stream 7 exiting the black liquor heat treatment process, and the combined stream 15 is led to the absorber 16 where it is contacted with the white liquor stream 12.
- Stream 15 contains MM and DMS as major components and H 2 S, DMDS, 0 2 , N 2 , and possibly CH 3 0H and turpentine as minor components.
- MM and H 2 S in stream 15 is absorbed into the white liquor leading to the formation of methyl mercaptide ion and hydrosulphide ion, respectively.
- some of the DMDS is also possibly absorbed or condensed into the white liquor.
- DMS is the main constituent of the unabsorbed gases, stream 17.
- the white liquor exiting the absorber, stream 18, is used in one or more stages of the digestion process. Pulping is enhanced as a consequence of the significant concentration of methyl mercaptide ion in the cooking liquor.
- the primary option for utilization of the unabsorbed gases, stream 17, is co-conversion with black liquor in the black liquor conversion reactor 9 (in the conventional process, co- combustion in the recovery furnace). In this way the sulphur contained in these gases is conveniently converted into, ultimately, the active pulping agent NaHS.
- stream 17 contains only a small proportion of the total amount of recycled sulphur, it can be combusted in block 19 which represents the lime kiln, the odour gas incinerator, or other such on-site furnace equipped with a device for removing S0 2 from the flue gases.
- the air-rich sulphur gas stream 13 can be either processed in block 9 or, if its sulphur content is low enough, combusted in block 19.
- H 2 S is either absorbed into the white liquor stream 18 or further converted into elemental sulphur which is added to the white liquor stream 18 .
- the required minimum input of methyl mercaptide ion is about 0.08 mol/mol of methoxyl input. From the results of Table 1 it is evident that this level of input of methyl mercaptide ion can be readily achieved through application of the present invention. Furthermore, at high extents of MM recycle, the minimum input can be achieved at moderate extents of demethylation.
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Paper (AREA)
Abstract
Procédé constituant un perfectionnement apporté au procédé kraft de réduction en pâte et aux processus de récupération de produits chimiques. Selon le procédé, on produit sur place des produits chimiques de réduction en pâte non traditionnels, et on les utilise en plus des produits chimiques traditionnels. Les produits chimiques actifs supplémentaires sont certains composés de sulfure organique, notamment l'ion de mercaptide méthylique, dérivés de composés volatils produits en quantités importantes par le traitement thermique de la liqueur résiduaire à une température supérieure à la température de réduction en pâte. Ce procédé offre deux avantages principaux: la réduction en pâte est améliorée par les produits chimiques supplémentaires, et la récupération et la réutilisation des produits chimiques de réduction sont considérablement plus souples que dans le procédé kraft classique.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI940933 | 1994-02-28 | ||
| FI940933A FI102976B1 (fi) | 1994-02-28 | 1994-02-28 | Menetelmä lisäkeittokemikaalien tuottamiseen ja käyttämiseen sulfaattiprosessissa |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1995023256A1 true WO1995023256A1 (fr) | 1995-08-31 |
Family
ID=8540207
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/FI1995/000089 WO1995023256A1 (fr) | 1994-02-28 | 1995-02-22 | Procede de production et d'utilisation de produits chimiques supplementaires destines a la reduction en pate dans un procede du type kraft |
Country Status (2)
| Country | Link |
|---|---|
| FI (1) | FI102976B1 (fr) |
| WO (1) | WO1995023256A1 (fr) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003062524A1 (fr) * | 2002-01-24 | 2003-07-31 | Kvaerner Pulping Ab | Procede de fabrication de pate a papier et dispositif mettant en oeuvre le procede |
| EP2326406A1 (fr) * | 2008-08-11 | 2011-06-01 | Metso Power AB | Procédé et système pour le traitement de gaz malodorants émanant d'une usine de pâte à papier |
| WO2018211175A1 (fr) * | 2017-05-16 | 2018-11-22 | Andritz Oy | Procédé de production de pâte chimique |
| RU2808813C2 (ru) * | 2017-05-16 | 2023-12-05 | Андритц Ой | Способ производства целлюлозы |
| US11844766B2 (en) | 2016-10-24 | 2023-12-19 | Janssen Pharmaceuticals, Inc. | ExPEC glycoconjugate vaccine formulations |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1517178B2 (de) * | 1964-08-28 | 1975-02-13 | Papel Loreto & Pena Pobre | Verfahren zur Herstellung von Zellstoff |
| WO1992013994A1 (fr) * | 1991-02-06 | 1992-08-20 | A. Ahlstrom Corporation | Procede de recuperation d'energie et de produits chimiques a partir de liqueur noire |
| EP0517689A1 (fr) * | 1991-05-24 | 1992-12-09 | Kamyr, Inc. | Liqueurs avec quantités de sulfure à plusieurs niveaux |
-
1994
- 1994-02-28 FI FI940933A patent/FI102976B1/fi not_active IP Right Cessation
-
1995
- 1995-02-22 WO PCT/FI1995/000089 patent/WO1995023256A1/fr active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1517178B2 (de) * | 1964-08-28 | 1975-02-13 | Papel Loreto & Pena Pobre | Verfahren zur Herstellung von Zellstoff |
| WO1992013994A1 (fr) * | 1991-02-06 | 1992-08-20 | A. Ahlstrom Corporation | Procede de recuperation d'energie et de produits chimiques a partir de liqueur noire |
| EP0517689A1 (fr) * | 1991-05-24 | 1992-12-09 | Kamyr, Inc. | Liqueurs avec quantités de sulfure à plusieurs niveaux |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003062524A1 (fr) * | 2002-01-24 | 2003-07-31 | Kvaerner Pulping Ab | Procede de fabrication de pate a papier et dispositif mettant en oeuvre le procede |
| EP2326406A1 (fr) * | 2008-08-11 | 2011-06-01 | Metso Power AB | Procédé et système pour le traitement de gaz malodorants émanant d'une usine de pâte à papier |
| EP2326406A4 (fr) * | 2008-08-11 | 2014-06-18 | Metso Power Ab | Procédé et système pour le traitement de gaz malodorants émanant d'une usine de pâte à papier |
| US11844766B2 (en) | 2016-10-24 | 2023-12-19 | Janssen Pharmaceuticals, Inc. | ExPEC glycoconjugate vaccine formulations |
| WO2018211175A1 (fr) * | 2017-05-16 | 2018-11-22 | Andritz Oy | Procédé de production de pâte chimique |
| US11473241B2 (en) | 2017-05-16 | 2022-10-18 | Andritz Oy | Method of producing chemical pulp |
| RU2808813C2 (ru) * | 2017-05-16 | 2023-12-05 | Андритц Ой | Способ производства целлюлозы |
Also Published As
| Publication number | Publication date |
|---|---|
| FI940933A0 (fi) | 1994-02-28 |
| FI102976B (fi) | 1999-03-31 |
| FI102976B1 (fi) | 1999-03-31 |
| FI940933A (fi) | 1995-08-29 |
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