EP0060277A1 - Process to produce pulps. - Google Patents
Process to produce pulps.Info
- Publication number
- EP0060277A1 EP0060277A1 EP81902585A EP81902585A EP0060277A1 EP 0060277 A1 EP0060277 A1 EP 0060277A1 EP 81902585 A EP81902585 A EP 81902585A EP 81902585 A EP81902585 A EP 81902585A EP 0060277 A1 EP0060277 A1 EP 0060277A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pulp
- stage
- fibrous material
- process according
- solution
- 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
- 238000000034 method Methods 0.000 title claims abstract description 56
- 230000008569 process Effects 0.000 title claims abstract description 51
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 26
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 26
- 239000002657 fibrous material Substances 0.000 claims abstract description 19
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 13
- 239000000243 solution Substances 0.000 claims abstract description 12
- 239000010902 straw Substances 0.000 claims abstract description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000001301 oxygen Substances 0.000 claims abstract description 6
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 6
- 241000609240 Ambelania acida Species 0.000 claims abstract description 4
- 239000010905 bagasse Substances 0.000 claims abstract description 4
- 239000012670 alkaline solution Substances 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims abstract 6
- 239000000725 suspension Substances 0.000 claims abstract 6
- 239000011121 hardwood Substances 0.000 claims abstract 2
- 239000000126 substance Substances 0.000 claims description 25
- 238000004061 bleaching Methods 0.000 claims description 19
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 17
- 238000011282 treatment Methods 0.000 claims description 17
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 12
- 238000010411 cooking Methods 0.000 claims description 12
- 229910001882 dioxygen Inorganic materials 0.000 claims description 12
- 235000013311 vegetables Nutrition 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000005470 impregnation Methods 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims description 2
- 239000003245 coal Substances 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims 1
- 239000001095 magnesium carbonate Substances 0.000 claims 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims 1
- 241000196324 Embryophyta Species 0.000 abstract description 22
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 229920001131 Pulp (paper) Polymers 0.000 abstract description 5
- 239000002023 wood Substances 0.000 abstract description 5
- 229920002678 cellulose Polymers 0.000 abstract description 3
- 239000001913 cellulose Substances 0.000 abstract description 3
- PFUVRDFDKPNGAV-UHFFFAOYSA-N sodium peroxide Chemical compound [Na+].[Na+].[O-][O-] PFUVRDFDKPNGAV-UHFFFAOYSA-N 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 15
- 239000002994 raw material Substances 0.000 description 12
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 9
- 238000011084 recovery Methods 0.000 description 9
- 238000005406 washing Methods 0.000 description 9
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 8
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 description 8
- 239000000203 mixture Substances 0.000 description 8
- 239000000376 reactant Substances 0.000 description 7
- 239000000377 silicon dioxide Substances 0.000 description 7
- 239000001569 carbon dioxide Substances 0.000 description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 6
- 238000003860 storage Methods 0.000 description 6
- 239000000835 fiber Substances 0.000 description 5
- 239000002699 waste material Substances 0.000 description 5
- 239000004155 Chlorine dioxide Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 235000019398 chlorine dioxide Nutrition 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 235000011121 sodium hydroxide Nutrition 0.000 description 4
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 239000005864 Sulphur Substances 0.000 description 3
- 239000000460 chlorine Substances 0.000 description 3
- 229910052801 chlorine Inorganic materials 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 230000009257 reactivity Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 241000209140 Triticum Species 0.000 description 2
- 235000021307 Triticum Nutrition 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 238000009993 causticizing Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 159000000011 group IA salts Chemical class 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 229910021653 sulphate ion Inorganic materials 0.000 description 2
- BZSXEZOLBIJVQK-UHFFFAOYSA-N 2-methylsulfonylbenzoic acid Chemical compound CS(=O)(=O)C1=CC=CC=C1C(O)=O BZSXEZOLBIJVQK-UHFFFAOYSA-N 0.000 description 1
- 241000736542 Awaous banana Species 0.000 description 1
- 244000025254 Cannabis sativa Species 0.000 description 1
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- 244000060011 Cocos nucifera Species 0.000 description 1
- 235000013162 Cocos nucifera Nutrition 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 244000068988 Glycine max Species 0.000 description 1
- 235000010469 Glycine max Nutrition 0.000 description 1
- 244000299507 Gossypium hirsutum Species 0.000 description 1
- 240000000797 Hibiscus cannabinus Species 0.000 description 1
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 1
- 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 1
- 240000006240 Linum usitatissimum Species 0.000 description 1
- 235000004431 Linum usitatissimum Nutrition 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 244000273256 Phragmites communis Species 0.000 description 1
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 241000112708 Vates Species 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000002154 agricultural waste Substances 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 239000007844 bleaching agent Substances 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000005446 dissolved organic matter Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000005213 imbibition Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000000050 nutritive effect Effects 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 238000004076 pulp bleaching Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- 238000003911 water pollution Methods 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
- D21C11/00—Regeneration of pulp liquors or effluent waste waters
- D21C11/04—Regeneration of pulp liquors or effluent waste waters of alkali lye
-
- 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
- D21C3/026—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes in presence of O2, e.g. air
-
- 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
- D21C9/1073—Bleaching ; Apparatus therefor with O3
Definitions
- This invention refers to a process to produce pulps from vegetable, lignocelllulose-containing fibrous material, e.g. coniferous wood, straw and bagasse.
- the main object of the invention is to provide a process for production of pulps wherein the handling of the chemicals is simplified so that the aforestated drawbacks are avoided.
- a second object of the invention is by the simplified handling of chemicals to obtain lower investment costs which results in that minor plants also become profitable which permits installation of plants nearer the raw material sources with consequent reduction of transport costs, which also involves a generally widened range of raw or starting materials.
- a third object of the invention is to render possible in this connection a widened utilization of non-traditional raw materials for production of pulps such as green chips, i.e. twigs, branches, bushes and shrubs and low-grade timber especially from coniferous wood as result from various thinning and cleaning operations, furthermore agricultural wastes like wheat, rice straw and bagasse, but also e.g.
- banana stems, soybeans and coconut shells furthermore also from other annual vegetables cultivated for their fibre content more than with regard to their nutritive value, such as cotton, flax, kenaf, but also wild annual vegetables such as certain kinds of grass and reeds, and finally also wastes from traditional woodworking industry in the shape of sawmill waste and especially waste from tropical kinds of wood possessing very high density and therefore difficult to treat with conventional processes of pulp production, and waste from traditional pulp industry in the shape of knot catcher rejects and some kind of fibre sludge.
- other annual vegetables cultivated for their fibre content more than with regard to their nutritive value such as cotton, flax, kenaf, but also wild annual vegetables such as certain kinds of grass and reeds
- the figure shows diagrammatically a complete plant for utilization of straw, the process being subdivided into blocks (A, B, C, D, E, F, H, I) and units, each one representing a section of the plant. Following the direction of the main flow represented by double drawn arrows, one will observe:
- Block A represents the washing in that section of the plant where the fibrous material is washed in several steps with water and waste liquor from the pulp washing after the first cooking step to remove heavier particles and sand, but also some fine substance of partly colloidal nature, from the fibrous material.
- the washing can be carried out under some simultaneous disintegration of the fibrous material.
- makeup losses in the washing and recovery systems
- the whole process stage is carried out at temperatures between 50 and 110°C and results in addition to impregnation in a first defibration and delignification
- the impregnated fibrous material is dehydrated in a press to a dry content between 20 and 55%.
- the dry content in the outlet from the press and the concentration of the circulating liquid in block B renders possible control of the concentration of chemicals in the outlet from the system so that the amount is the necessary one to counterbalance losses in the process and to activate the carbonate according to the principles of the invention.
- Block C represents that section of the plant where a continued delignif ication in a pressurized reactor is effected after supply of recycled sodium carbonate (Na 2 CO 3 ) from a chemical recovery system.
- Block C represents also that section of the plant where the delignif ication is completed by means of oxygen gas.
- the vegetable raw material coming from block B is added with the cooking chemical Na 2 CO 3 in that defibration stage which constitutes the beginning of block C.
- the delignif icating reaction is completed in a pressurized oxygen gas reactor.
- the oxygen gas is added to the fibrous material in known manner in a mixer especially constructed for this purpose.
- Block D-D 1 represents the different bleaching stages used on the unbleached, easily bleachable pulp which is produced by the process of the invention. Of particular interest is the possibility to use ozone (block D 1 ) which will be described below.
- Block E represents the plant section where dehydration, drying and baling following traditional techniques are carried out.
- Blocks F, G, H, I, L, M represent auxiliary plants of the main line.
- the continuous lines coupled with the dotted lines represent alternative flow lines.
- Block F represents a section where in case of using raw materials with high silica or silica-compound content, a first treatment of the effluents is obtained to reduce silica. This treatment will also be described nearer more below.
- Block G represents the section of the plant for use as storage or for production of chemicals necessary for the process and particularly:
- G 1 corresponds to storage of reactants and auxiliary additives for the various cooking and bleaching stages
- G 2 corresponds to the section for production of chlorine dioxide ( C10 2 ),
- G 3 corresponds to storage of sodium hydroxide (NaOH),
- G 4 corresponds to storage of hydrogen peroxide (H 2 O 2 )
- G 5 and G 6 correspond respectively to the sections for production of, respectively, oxygen gas (O 2 ) and ozone
- Block H represents the section for the treatment of the gases consisting of a mixture of O 2 + CO 2 + H 2 O coming from the relief valve of the oxygen gas reactor (block C).
- the aim is to separate and recycle O 2 following a technique which will be described hereinafter.
- Block I represents the section to remove traces of O 3 from the mixture O 2 + O 3 coming from the bleaching system in case the bleaching is based on ozone (block D 1 ).
- Block L represents the section for secondary treatment of effluents coming from the individual sections of the plant: at 1) admission of the effluent from the raw material washing (see block A); at 2) admission of the effluent from the bleaching when the alternative technique chosen originates an effluent containing chlorine dioxide; at 3) admission of effluents from various mill services.
- Block M finally represents the plant section for recovery of chemicals and heat as follows:
- M 1 represents the evaporating system for concentrating black liquors coming from the main pulp production line.
- M 2 represents the system for concentrated black liquor combustion and heat recovery from the dissolved organic matter of the raw material and recovery of chemicals such as Na 2 CO 3 .
- M 3 represents dissolution and storage of the recovered Na 2 CO 3 solution which is recycled to the delignification stages (blocks B and C).
- sodium carbonate is used as reactant.
- the reactivity of the mentioned salt is known to be low towards lignine but also towards the cellulosic components and the cellulose and in any case inferior to the reactivity of the correspondent hydrate. Therefore the carbonate is activated, in the two stages where the delignification is accomplished by means of sodium hydrate which is added in that stage, where chips imbibition takes place, in quantities corresponding to the necessary ones to make up the loss of process reactants.
- the quantity varies, according to raw materials and final products, between 15 and 30 kgs of hydrate per BDT (bone dry ton) of processed fibrous material.
- O 2 For the activation O 2 also and possibly other oxidative agents (peroxides) are used in the last phase of delignification where working preassure, temperature and amount of O 2 are varied within very wide limits (10-20 Bar, 110-150oC and 6-14% of O 2 ) according to raw material and desired final products.
- the process according to the invention is therefore characterized by the use of carbonate as alkaline salt directly in the process of delignification which develops in one or several stages.
- Very good delignification (kappa no between 15 and 8) has been obtained whith the aforedescribed process simultaneously with viscosity levels high enough after the subsequent bleaching process to ensure good characteristics of resistance of the paper pulp together with a brightness of about 50% Scan impossible to be obtained by any known alkaline process.
- Characteristic for the process according to the invention is also that it yields pulps with low extractive content and with high cleanliness inspite of utilization of low quality raw material containing bark, for example. This is due to the fact that oxygen gas in alkaline medium reacts specifically with bark and fibre bundles which are difficult to become delignified by usual processes.
- pulps produced accord ing to the invention are highly bleachable by ozone which affords a number of advantages.
- Ozone bleaching is carried out in a single stage at atmospheric pressure. Investment and energy costs of the ozone bleaching are lower than for other comparable processes.
- the production costs for ozone and chlorine dioxide are on the same level as today's technology, the energy consumption is 10 kWh per kg ozone provided that ozonisers are fed with oxygen, in comparison to 12-14 kWh per kg of chlorine dioxide starting from sodium chlorate.
- the effluent from the ozone bleaching stage can be conveyed to black liquor evaporation and combustion, for which reason environmental pollution is reduced to a minimum.
- the process according to the invention is characterized also by the possibility of utilizing O 2 (moist and not pure) resulting from the ozone bleaching treatment.
- Industrial ozonisers when fed with oxygen yield a gas mixture where the ozone content is 2.5-2.7 %.
- oxygen may be recycled to the second delignification stage.
- the gas mixture coming from the bleaching stage (block D) is here passed through an ozone purifier in the shape of a coal bed (block I) in the presence of water in order to prevent carbohydrate degradation which is particularly severe at the used high reactor temperature even when traces only of ozone are present.
- Pressure control in the oxygen gas reactor (block C) and providing security that any explosive gas mixture of carbon monoxide (CO) and oxygen gas (O 2 ) cannot be formed are made by continuous venting of the reactor for treatment of the mixture of steam, carbon dioxide and oxygen gas.
- the treatment is carried out by washing the mixture with a carbonate solution.
- Sufficiently pure oxygen gas is obtained which is separated and recycled to the reactor after recompression whereas the carbonate is turned into bicarbonate. By heating the bicarbonate solution the carbon dioxide is expelled and the obtained carbonate solution is concentrated and can be used again for washing (block H).
- Black liquors contain those inorganic chemicals which have been used for the del ignification, chemicals to a small extent as free reactants and for the most part in combination with salts of organic acids, alkal lignine and other compounds of sometimes v e ry complex structure and forming non-eel 1 ulosic wood components.
- the process according to the invention renders possible a treatment for reducing the silica content in black liquors.
- the treatment is based on the fact that the solubility of silica is a function of the pH of the alkaline solutions and that the silica content is higher in the so-called "0" fibre fraction than in other fibre fractions.
- the treatment is carried out as separation of that fraction of the black liquor from the straw washing stage which has a high content of "0" fibres.
- the pH reduction of the liquor by means of that CO 2 which is present in the combustion gas enables silica to be precipitated out of the system (block F in the figure).
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Abstract
Procede de production de pates a papier a partir d'un materiau vegetal, fibreux contenant de la cellulose telle que du bois de conifere, du bois dur, de la paille, des bagasses etc, le materiau fibreux etant traite en plusieurs etapes. Dans une premiere etape, le materiau fibreux est impregne d'une solution d'hydroxyde de sodium dans laquelle le materiau est trempe et partiellement desintegre par travail mecanique. Dans une seconde etape l'exces de solution alcaline est extrait par pression jusqu'a ce que la teneur en peroxyde de sodium dans la pate brute soit au moins egale a 15 kgs par tonne BD de pate. Dans une troisieme etape, le materiau de pate est soumis a une desintegration supplementaire avec apport d'une solution de carbonate de sodium de maniere a obtenir une suspension pouvant etre pompee et ayant une teneur en carbonate de sodium de 150-400 kgs par tonne BD de pulpe. Dans une quatrieme etape, la suspension est soumise a un procede de cuisson a une temperature d'au moins 100 C pendant 1-4 heures tout en etant agitee, et avec apport d'oxygene, apres quoi la pate cuite est lavee.Process for the production of paper pulp from a fibrous plant material containing cellulose such as coniferous wood, hardwood, straw, bagasse etc, the fibrous material being treated in several stages. In a first step, the fibrous material is impregnated with a sodium hydroxide solution in which the material is soaked and partially disintegrated by mechanical work. In a second step, the excess alkaline solution is extracted by pressure until the sodium peroxide content in the raw dough is at least equal to 15 kgs per tonne BD of dough. In a third step, the dough material is subjected to an additional disintegration with the addition of a solution of sodium carbonate so as to obtain a suspension which can be pumped and having a sodium carbonate content of 150-400 kgs per ton BD pulp. In a fourth step, the suspension is subjected to a baking process at a temperature of at least 100 C for 1-4 hours while being stirred, and with the addition of oxygen, after which the cooked dough is washed.
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT81902585T ATE18782T1 (en) | 1980-09-22 | 1981-09-21 | PROCESS FOR MAKING PAPER PULP. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT8024818A IT1209352B (en) | 1980-09-22 | 1980-09-22 | PROCESS FOR THE PRODUCTION OF CHEMICAL CELLULOSE AND / OR PAPER PASTES, AS WELL AS THE PLANT AND ITS COMPONENTS FOR THE IMPLEMENTATION OF THE INDICATED PROCESS |
IT24818 | 1980-09-22 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0060277A1 true EP0060277A1 (en) | 1982-09-22 |
EP0060277B1 EP0060277B1 (en) | 1986-03-26 |
Family
ID=11214834
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81902585A Expired EP0060277B1 (en) | 1980-09-22 | 1981-09-21 | Process to produce pulps |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0060277B1 (en) |
BR (1) | BR8108805A (en) |
DK (1) | DK155192C (en) |
IT (1) | IT1209352B (en) |
WO (1) | WO1982001019A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU624941B2 (en) * | 1987-06-26 | 1992-06-25 | Betz International, Inc. | Method of enhancing the cooking of wood chips for pulp production |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2684697B1 (en) * | 1991-12-09 | 1996-05-03 | Toulouse Inst Nat Polytech | PROCESS FOR THE MANUFACTURE OF BLEACHED PAPER PULP. |
IN177634B (en) * | 1992-04-06 | 1997-02-15 | Process Improvement Systems Pbc | |
KR20010077423A (en) * | 2000-02-01 | 2001-08-20 | 방윤혁 | Method of manufacturing a regenerated cellulose fiber from the rice straw |
RU2447219C2 (en) * | 2007-12-05 | 2012-04-10 | Схандонг Фуйин Папер Энд Енвиронментал Протектион Текхнологи Ко., Лтд | Paper products from straw of cereals of natural colour and their fabrication technique |
EP2374930B1 (en) * | 2008-12-09 | 2016-05-18 | Shandong Fuyin Paper & Environmental Protection Technology Co., Ltd | Raw paper and production method and application thereof |
US8795469B2 (en) * | 2010-06-25 | 2014-08-05 | Prairie Paper Ventures Inc. | Method for preparing nonwood fiber paper |
EP3209830A4 (en) | 2014-10-24 | 2018-07-25 | Teknologian tutkimuskeskus VTT Oy | Method of processing and fractionating biomass and use of fractions thus obtained |
GB2534589A (en) * | 2015-01-28 | 2016-08-03 | Innovia Films Ltd | Process |
CN116497619A (en) * | 2023-05-17 | 2023-07-28 | 岳阳林纸股份有限公司 | Natural color chemimechanical pulping process for camphorwood sodium hydroxide |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE374769B (en) * | 1970-04-03 | 1975-03-17 | Mac Millan Bloedel Ltd | |
SE355614B (en) * | 1970-05-13 | 1973-04-30 | Mo Och Domsjoe Ab | |
JPS5130601B2 (en) * | 1972-01-17 | 1976-09-02 | ||
US4045279A (en) * | 1972-01-17 | 1977-08-30 | Toyo Pulp Co., Ltd. | Process for the manufacture of pulp using sodium carbonate and oxygen |
SE373896B (en) * | 1972-07-05 | 1975-02-17 | Mo Och Domsjoe Ab | |
GB1449828A (en) * | 1973-04-26 | 1976-09-15 | Canadian Ind | Oxygen pulping process |
-
1980
- 1980-09-22 IT IT8024818A patent/IT1209352B/en active
-
1981
- 1981-09-21 BR BR8108805A patent/BR8108805A/en unknown
- 1981-09-21 WO PCT/SE1981/000273 patent/WO1982001019A1/en active IP Right Grant
- 1981-09-21 EP EP81902585A patent/EP0060277B1/en not_active Expired
-
1982
- 1982-05-21 DK DK231182A patent/DK155192C/en active
Non-Patent Citations (1)
Title |
---|
See references of WO8201019A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU624941B2 (en) * | 1987-06-26 | 1992-06-25 | Betz International, Inc. | Method of enhancing the cooking of wood chips for pulp production |
Also Published As
Publication number | Publication date |
---|---|
IT1209352B (en) | 1989-07-16 |
DK155192B (en) | 1989-02-27 |
EP0060277B1 (en) | 1986-03-26 |
DK155192C (en) | 1989-07-10 |
WO1982001019A1 (en) | 1982-04-01 |
BR8108805A (en) | 1982-08-24 |
IT8024818A0 (en) | 1980-09-22 |
DK231182A (en) | 1982-05-21 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5595628A (en) | Production of pulp by the soda-anthraquinone process (SAP) with recovery of the cooking chemicals | |
US9683329B2 (en) | Methods of producing a paper product | |
US4248662A (en) | Oxygen pulping with recycled liquor | |
US4076579A (en) | Pulping of lignocellulosic material by sequential treatment thereof with nitric oxide and oxygen | |
WO1996041052A1 (en) | Modified organosolv pulping | |
EP0060277A1 (en) | Process to produce pulps. | |
JP2010144273A (en) | Method for producing chemical pulp of lignocellulose material | |
US4248663A (en) | Pulping with an alkaline liquor containing a cyclic keto compound and an amino compound | |
US3919041A (en) | Multi-stage chlorine dioxide delignification of wood pulp | |
US3707437A (en) | Pulping and bleaching of wood chips in a single stage with tertiary butyl hydroperoxide | |
EP0022881B1 (en) | Accelerated pulping process | |
US4113553A (en) | Sodium sulfide pulping with hydrogen sulfide generation | |
US2962413A (en) | Method of producing cellulosic pulp | |
WO1999020827A1 (en) | Process system and method for preliminary treatment of disintegrated cellulose-containing material prior to pulp digestion | |
CA1177609A (en) | Process to produce pulps | |
AU7587981A (en) | Process to produce pulps | |
US3490993A (en) | Process of treating lignocellulosic material with organomercaptan | |
US3773611A (en) | Two-stage sodium sulfite-oxygen pulping | |
US3520773A (en) | Alkaline pulping processes with chemical pretreatment | |
KR20010049536A (en) | Oxygen delignification of lignocellulosic material | |
US4787959A (en) | Process for preparing chemical paper pulps by cooking, intermediate grinding and a final alkaline peroxide delignification | |
JPH11217783A (en) | Production of pulp having low resin content | |
RU2135665C1 (en) | Pulp preparation method | |
US1830461A (en) | Production of pulp, etc. | |
EP0012775B1 (en) | Process for pulping ligno-cellulosic material |
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: 19820608 |
|
AK | Designated contracting states |
Designated state(s): AT DE FR GB NL SE |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT DE FR GB NL SE |
|
REF | Corresponds to: |
Ref document number: 18782 Country of ref document: AT Date of ref document: 19860415 Kind code of ref document: T |
|
ET | Fr: translation filed | ||
REF | Corresponds to: |
Ref document number: 3174191 Country of ref document: DE Date of ref document: 19860430 |
|
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 | ||
REG | Reference to a national code |
Ref country code: GB Ref legal event code: 732 |
|
NLS | Nl: assignments of ep-patents |
Owner name: FRANCO NARDI TE CERVIGNANO DEL FRIULI, ITALIE. |
|
NLT1 | Nl: modifications of names registered in virtue of documents presented to the patent office pursuant to art. 16 a, paragraph 1 |
Owner name: SUNDS DEFIBRATOR INDUSTRIES AKTIEBOLAG TE SUNDSVAL |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: TP |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: 732 |
|
NLS | Nl: assignments of ep-patents |
Owner name: NACO .P S.R.L. TE CERVIGNANO DEL FRIULI, ITALIE. |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: TP |
|
EAL | Se: european patent in force in sweden |
Ref document number: 81902585.9 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20000907 Year of fee payment: 20 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: AT Payment date: 20000911 Year of fee payment: 20 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 20000918 Year of fee payment: 20 Ref country code: FR Payment date: 20000918 Year of fee payment: 20 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 20000925 Year of fee payment: 20 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20001026 Year of fee payment: 20 |
|
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 EXPIRATION OF PROTECTION Effective date: 20010920 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION Effective date: 20010921 Ref country code: AT Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION Effective date: 20010921 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY Effective date: 20010929 |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: PE20 Effective date: 20010920 |
|
NLV7 | Nl: ceased due to reaching the maximum lifetime of a patent |
Effective date: 20010921 |
|
EUG | Se: european patent has lapsed |
Ref document number: 81902585.9 |