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7615134 |
Method and arrangement of impregnating chips
The method and an arrangement are for improved impregnation of chips in association with the manufacture of chemical cellulose pulp. Un-steamed chips are fed into an impregnation vessel ( 30 ) in...
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7566380 |
Continuous digester with fluid circulation
The arrangement concerns an improved design for at least one of the cooling, dilution and washing at the bottom of a continuous digester for the production of cellulose pulp. By arranging at least...
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7547374 |
Method for impregnating chips in a continuous digestion system
A method for impregnating chips in a continuous digestion system with an impregnation vessel and a digester. The digestion system has a heat exchanger arranged between a first return line and a...
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7540938 |
Method and system for energy savings in TMP by high temperature LC/MC refining of pulp
A method for recovering heat from a pulp refining process comprising: discharging pressurized pulp from a high pressure refiner, wherein the pressurized pulp comprises a pressurized slurry of...
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7501043 |
Steam treatment of chips with the addition of an acid liquid
The method is for the pre-treatment of chips that are fed to a sulphate cooking process. Through the addition of an acidic fluid to the steam treatment step, a very high ionic concentration of...
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7455749 |
Gas phase continuous digester having an inverted top separator with liquor injection
A method for adding cooking liquor into a vapor phase continuous digester for producing chemical cellulose pulp from cellulose chips including: introducing a slurry of the cellulose chips from a...
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7445691 |
Impregnation of chips with an acid liquid prior to a sulphate pulping process
The method is for pre-treatment of chips that are fed to a sulphate cooking process. Through acidification of the chips in an acidic treatment fluid with a subsequent draining of free treatment...
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7402224 |
Method for producing paper pulp, lignins, sugars and acetic acid by frantionation of lignocellulosic vegetable material in formic/acetic acid medium
A method for producing paper pulp from a lignocellulosie vegetable raw material. The method includes contacting the raw material with a mixture of formic acid and acetic acid (in an amount more...
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7381303 |
System and method for controlling a thermo-mechanical wood pulp refiner
Thermomechanical pulp is an important process for producing fibrous mass used in papermaking. A two-level control strategy that stabilizes and optimizes the refining process has been developed. The...
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7381302 |
Method and arrangement for impregnating chips
The method and an arrangement are for improved impregnation of chips in association with the manufacture of chemical cellulose pulp. Un-steamed chips are fed into an impregnation vessel ( 30 ) in...
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7374637 |
Method of bleaching cellulose pulp with a main conduit for wash liquor and filtrate
The method is for bleaching cellulose pulp in a bleach line that has at least two bleaching steps. The filtrate distribution is led up through the bleaching line counter-currently to the flow of...
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7351306 |
Cooking of cellulose pulp in a cooking liquor containing pre-evaporated black liquor
The method is for cooking of cellulose pulp in which the raw material, preferably in the form of chips, undergoes a successive elevation of temperature towards the cooking temperature while the...
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7351305 |
Method and a digester for the continuous cooking of wood raw material to cellulose pulp
The digester and method are for the continuous cooking of pulp. At least two withdrawal positions ( 11 E, 11 D) for cooking fluid are arranged at different heights in the digester ( 10 ). The...
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7303649 |
Removal of inorganic elements from wood chips
In a process of treating wood chips for reduction of the concentration of undesirable inorganic elements prior to cooking in a production line for chemical pulp, the wood chips, having entrapped...
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7285179 |
Continuous digester for cellulose pulp including method and recirculation system for such digester
The continuous digester is for producing chemical pulp to a process for operating this digester and to a feedback system for the cooking liquid. By means of implementing cooking zones 1st, 2nd,...
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7279070 |
Method for the continuous cooking of wood raw material for cellulose pulp
The invention concerns a simplified method for the continuous cooking of wood raw material in the form of sawdust for the production of cellulose pulp, The method does not require any thickening...
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7270725 |
Pretreatment of chips with white liquor prior to a treatment with black liquor
The method is for the manufacture of cooked cellulose pulp in which the starting material, preferably chips, undergoes a successive increase in temperature towards cooking temperature. This is done...
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7252739 |
Method for distributing cellulose pulp of low and medium consistency in order to form a uniform pulp web
The method is for distributing cellulose pulp that has a 2-12% consistency. A manifoid housing is in fluid communication with distributor housing. The distributor housing has holes that are...
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7229524 |
Feeding arrangement for feeding of chips to chip bins
The invention relates to a feed arrangement for feeding chips to chip bins ( 1 ) in the production of cellulose pulp in continuous digesters ( 16 ), in which the chip bin is constituted by a...
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7217338 |
Process for continuously cooking chemical cellulose pulp
The process is for continuously cooking chemical pulp in a digester system consisting of at least one vessel for impregnating and cooking comprising an inlet into which a mixture of chips and...
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7156952 |
Method and arrangement for oxygen delignification of cellulose pulp
The invention relates to a method and arrangement for alkaline oxygen delignification of cellulose pulp. By adding alkali in the final phase of the oxygen delignification one can ensure that an...
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7112256 |
Method for continuous cooking of chemical pulp to improve heat economy
A method for the continuous cooking of chemical pulp with the aim of achieving improved heat economy in a digester system having a vessel ( 1 ) for impregnation and a vessel ( 2 ) for cooking the...
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7105076 |
Gas phase continuous digester having an inverted top separator with liquor injection
A continuous digester is disclosed for producing chemical cellulose pulp from cellulose chips, comprising: a continuous digester vessel having a lower section filled with the cellulose chips and an...
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RE39208 |
Method of treating material in a continuous digester
A comminuted cellulosic fibrous material treatment vessel assembly includes a substantially vertical vessel having a top, bottom, and outlet, and through which the material flows in a flow...
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6986828 |
Process for producing low DP microcrystalline cellulose
A process for producing microcrystalline cellulose. The process comprising the following steps:
a) preparation of a pulp by repulping, b) pressing of the pulp obtained in a), c) decompaction...
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6966970 |
Method for supplying washing liquid to a process for cooking cellulose pulp
The invention relates to a method for supplying washing liquid to a digester ( 1 ) for cellulose pulp and a subsequent diffuser washing device ( 2 a, 2 b). A high, disturbance-free production...
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6881298 |
Process for loading fibers with calcium carbonate in a plurality of reactors
For a process and an apparatus for loading fibers contained in a pulp suspension with calcium carbonate, a calcium oxide and/or a medium containing calcium hydroxide is fed to the pulp suspension,...
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6841036 |
Process for the oxygen delignification of pulp in two stages with higher pressure in the second stage
A system and process for the oxygen delignification of pulp consisting of a lignocellulose-containing material that has a mean concentration of 8-18% pulp consistency. The oxygen delignification...
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6808596 |
System for the oxygen delignification of pulp consisting of lignocellulose-containing material
The system is for the oxygen delignification, in at least two reaction stages, of pulp that consists of lignocellulose-containing material having a mean concentration of 8%-18% pulp consistency....
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6736934 |
Method of pretreating pulp in an acid tower prior to bleaching with peroxide
The present invention relates to a method of pretreating, by acidification and chelation, of pulp to be bleached with peroxide. Especially, the invention relates to intensifying, and at the same...
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6716307 |
Process and system for the removal of scale build-up
A method to remove scale build-up in a vessel having at least one screen is described and involves placing a cover inside the vessel such that it is located beneath at least one screen to separate...
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6699357 |
Process for continuous cooking of pulp
The invention relates to a process for continuous cooking of wood chips at elevated pressure and temperature in a vertical digester ( 1 ) for production of chemically dissolved pulp. Fiber material...
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6620292 |
Cellulose production from lignocellulosic biomass
A multi-function process is described for the separation of cellulose fibers from the other constituents of lignocellulosic biomass such as found in trees, grasses, agricultural waste, and waste...
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6582554 |
Continuous digester having a sectioned top separator with multiple liquor extraction ports
A method is disclosed for extracting liquor from a cellulose slurry for a continuous digester comprising the steps of: providing the cellulose slurry of liquor and chips of cellulose fiber material...
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6576084 |
Method of pretreating pulp with yield or strength-enhancing additive
Chemical pulp is produced from a slurry of comminuted cellulosic fibrous material using a beneficial additive such as AQ, or polysulfide. In the first treatment zone the effective alkali...
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6572734 |
Method for treatment of loose material
A pre-treatment device for wood chips for pulping comprises a tube through which the wood chips fall into a digester. Steam is injected into the tube through rings of nozzles, which are angled...
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6544384 |
Pretreatment of chips before cooking
The strength properties of chemical cellulose pulp (particularly kraft pulp) are improved by substituting a cold impregnation soak for conventional impregnation procedures. After steaming, wood...
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6533896 |
Method for the production of precleaned pulp
A method for preparing pulp from lignin-containing cellulosic material is disclosed, including a step for acid cleaning of the lignocellulosic material, followed by alkaline delignification. The...
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6475338 |
Method of minimizing transition metal ions during chemical pulping in a digester by adding chelating agent to the digester
The production of chemical (e.g., kraft) cellulose pulp much more suited to totally chlorine free or elemental chlorine free bleaching is produced by reducing the bleaching chemical consumability...
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6468390 |
Method for continuous cooking of lignocellulosic fiber material
A method for continuous cooking of lignocellulosic fiber material, comprising the steps of sequentially (a) in a first stage, impregnating the fiber material in an impregnation liquid comprising...
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6454900 |
Method for two-stage oxygen delignification of chemical pulp
Methods for oxygen delignification of a pulp are disclosed, including initially delignifying the pulp at a delignification temperature of less than 90° C., adding oxygen to the pulp so that the...
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6447645 |
Feeding cellulose material to a treatment vessel
A feed system for a cellulose pulp treating vessel (such as a continuous digester) is not limited by the required L/W ratio of the pump feeding a wood chip slurry to a high pressure transfer...
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6419788 |
Method of treating lignocellulosic biomass to produce cellulose
A multi-function process is described for the separation of cellulose fibers from the other constituents of lignocellulosic biomass such as found in trees, grasses, agricultural waste, and waste...
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6361649 |
Method for the continuous cooking of chemical pulp
A method in connection with continuous cooking of chips, comprising impregnation of the chips with impregnation liquid in an impregnation vessel ( 3 ) and cooking of the impregnated chips in a...
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6350348 |
Batch cooking with black liquor pretreatment
A method of cooking pulp in an alkaline batch process (using one or more batch digesters) improves pulp bleachability. The wood material is supplied to the digester; the cellulosic material is...
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6344112 |
Screen having inclined slots for a digester
A screen used in the production of cellulose pulp may be mounted in a digester to minimize traditional screen problems (including clogging) without introducing new problems. The screen comprises a...
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6325888 |
Method for pulping sawdust
Chemical cellulose pulp is made from sawdust utilizing a static down-flow retention vessel. By adding steam and cooking liquor to a flow of sawdust a heated slurry, at a cooking temperature of...
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6322665 |
Reactive compounds to fibrous webs
Methods for making high wet performance webs. A polymeric anionic reactive compound is applied heterogenously to a cellulosic fibrous web followed by curing of the compound to crosslink the...
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6319357 |
Method for two-stage oxygen bleaching and delignification of chemical pulp
Methods for oxygen delignification of a pulp are disclosed, including initially delignifying the pulp at a delignification temperature of less than 90° C., adding oxygen to the pulp so that the...
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6280567 |
System and method for treatment of cellulose-containing material prior to pulp digestion
The invention relates to a process system and a method for preliminary treatment of disintegrated cellulose-containing material, preferably wood chips, prior to pulp digestion. The process system...
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