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Class 162/41 - Recirculation (includes separation from fibers)


Subclass of Class 162 - Paper making and fiber liberation
Definition: Processes in which the used fiber liberation or treating
No. of patents: 68
Last issue date: 04/17/2012


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NumberTitleIssue Date
8157955Method and system for the large scale collection of ligno-cellulosic biomass
A system for collecting ligno-cellulosic biomass over a large area to enable the commercial refining of biomass from 2,500 to in excess of 50,000 tons of biomass per day to produce ethanol or other products. The biomass is collected at a series of collection points ...
04/17/2012
8057635Method and system for the large scale collection, preparation, handling and refining of ligno-cellulosic biomass
A system for collecting ligno-cellulosic biomass over a large area to enable the commercial refining of biomass from 2,500 to in excess of 50,000 tons of biomass per day to produce ethanol or other products. The biomass is collected at a series of collection points ...
11/15/2011
7445691Impregnation 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 fluid before subsequent steaming or wet-steaming, a high concentration o...
11/04/2008
7396434Catalytic reactor process for the production of commercial grade pulp, native lignin and unicellular protein
A continuous and batch system to produce cellulose, native lignin and unicellular protein from any form of vegetation in a closed process. The biomass is mixed in the impregnate solution of nitric acid and/or ammonium hydroxide and water. After a period of time at r...
07/08/2008
7364640Chemimechanical desilication of nonwood plant materials
A process for removing silica from nonwood plant materials involving both chemical and mechanical action is described. The silica-rich epidermal cells are liberated mechanically by a pre-pulping and low-consistency refining step and subsequently removed from the pul...
04/29/2008
7309401Top separator for gas phase and hydraulic phase continuous digesters and method for converting digester
A continuous digester for producing chemical cellulose pulp from cellulose chips including: a digester vessel with an upper section attached to a top separator and said vessel at least partially filled with the cellulose chips and a liquor; a top separator at least ...
12/18/2007
7297225Process for high temperature peroxide bleaching of pulp with cool discharge
A process for high temperature peroxide bleaching of pulp in which pulp is retained at high temperature and pressure to increase bleaching activity but in which the pulp is cooled prior to discharge from the pressure vessel below the flash point thereby resulting in...
11/20/2007
7285179Continuous 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, 3rd, 4th and 5th down through the digester, that have a successively dec...
10/23/2007
7282115Method for mitigating the interference caused by high-molecular weight-by-products in pulping processes
Separation of dissolved and colloidal high molecular weight organic by-products from liquors or filtrates in a cellulosic pulping process to improve the overall efficiency of the process. ...
10/16/2007
7279070Method 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 stages and can be carried out with a minimum of process equipment. The ...
10/09/2007
7270725Pretreatment 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 while the chips are first treated in a pre-treatment zone in which t...
09/18/2007
7241363Methods to decrease scaling in digester systems
One aspect of this invention relates to a method and digester for reducing the deposition of calcium-based scale in a wood chip digester including extraction from the digester of first and second quantities of cooking liquor having respective first and second calciu...
07/10/2007
7217338Process 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 process liquid is fed. The chips are impregnated at a predetermined impreg...
05/15/2007
6752903Method for mitigating the interference caused by high-molecular weight by-products in pulping processes
Separation of dissolved and colloidal high molecular weight organic by-products from liquors or filtrates in a cellulosic pulping process through a filtration media to improve the overall efficiency of the process. ...
06/22/2004
6746568Treatment of filtrates from peroxide bleaching of pulp
A method in bleaching of pulp is described, in which the pulp is subjected to a peroxide bleaching step, whereupon the pulp is washed and the washing liquid from the washing is separated from the pulp in the form of a filtrate. The method is characterised in that th...
06/08/2004
6551462System for feeding comminuted fibrous material
A system and method for feeding comminuted cellulosic fibrous material such as wood chips to the top of a treatment vessel such as a continuous digester provide enhanced simplicity, operability, and maintainability by eliminating the high pressure transfe...
04/22/2003
6514379Procedure for arranging water circulations in integrated paper mill
A procedure for arranging water circulations in an integrated paper mill, the paper making process of which having three partly separate process phases concerning the water circulations (I, II, III). In the first phase, the fiber raw material is pretreate...
02/04/2003
6413367Treatment of cellulosic material with a chelating agent prior to alkaline delignification
A process for the production of pulp using alkaline delignification is disclosed, wherein cellulosic material is initially treated with steam, and a chelating agent is added in connection with the steam treatment. The end pH of the steam treatment stage i...
07/02/2002
6361649Method 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 digester (4), the impregnation vessel and the digester being con...
03/26/2002
6332950Method in connection with the pretreatment of comminuted fibrous material
A method in connection with the pretreatment of comminuted fibrous material intended for chemical cellulose pulp production. The fibrous material is fed through a low pressure system that has a gas phase part followed by a liquid phase part. The liquid ph...
12/25/2001
6325889Hydraulic vessel system having a downwardly feeding separator
A new and improved way of continuously cooking fiber material, wherein temperatures and alkaline levels are controlled to be maintained within specific levels in different zones of the digesting process in order to optimize chemical consumption and heat-e...
12/04/2001
6277240Method for continuously pulping cellulosic fibrous material
In the production of chemical pulp, such as kraft pulp, it is possible to reduce the amount of ancillary equipment, and/or the size of the continuous digester vessel, while achieving enhanced uniformity of treatment by avoiding "hang ups". Instead of prov...
08/21/2001
6241851Treatment of cellulose material with additives while producing cellulose pulp
Chemical cellulose pulp (e.g. kraft pulp) is produced with enhanced strength and/or yield using a strength or yield enhancing additive such as polysulfide or anthraquinone or its equivalents or derivatives, and in a manner that allows effective recovery/r...
06/05/2001
6235151Inhibiting scaling in alkaline waste liquor evaporators
Calcium carbonate scaling is inhibited in a multi-stage alkaline waste liquor evaporation plant in a chemical cellulose pulp mill having a bleaching plant. Calcium-containing effluent from the bleaching plant is treated together with alkaline waste liquor...
05/22/2001
6203662Method for the continuous cooking of pulp in a digester system having a top separator
This invention relates to a new and improved way of continuously cooking fiber material, wherein temperatures and alkaline levels are controlled to be maintained within specific levels in different zones of the digesting process in order to optimize chemi...
03/20/2001
6174411Continuous digester with inverted top separator
A cellulose pulp continuous digester (e.g. for producing kraft pulp) is operated so that it has an inverted top separator and is hydraulically filled to above the level of the inverted top separator, and may be substantially completely hydraulically full....
01/16/2001
6159336Method and device for the continuous cooking of pulp
This invention relates to a new and improved way of continuously cooking fiber material, wherein temperatures and alkaline levels are controlled to be maintained within specific levels in different zones of the digesting process in order to optimize chemi...
12/12/2000
6132556Method of controlling pulp digester pressure via liquor extraction
A method of controlling the pressure of a vertical continuous comminuted cellulosic fibrous material (wood chip) digester is provided using a pressure-control extraction in a zone relatively insensitive to changes in the flow rate of liquid introduction o...
10/17/2000
6123807Method for the continuous cooking of pulp
This invention relates to a new and improved way of continuously cooking fiber material, wherein temperatures and alkaline levels are controlled to be maintained within specific levels in different zones of the digesting process in order to optimize chemi...
09/26/2000
6123808Distribution of dilution liquor to the discharge of a cellulose pulp digester
In a pulp treatment vessel, such as a kraft pulp continuous vertical digester, a cellulose slurry is caused to flow in the vessel interior in a flow path. A substantially annular void is formed at at least one point along the flow path, and dilution or tr...
09/26/2000
6103058Method for the continuous cooking of pulp
This invention relates to a new and improved way of continuously cooking fiber material in an over loaded digester, wherein temperatures and alkaline levels are controlled to be maintained within specific levels in different zones of the digesting process...
08/15/2000
6030492Impregnation of cellulose-containing material with black liquor in a single vessel digester
The present invention relates to a method for continuous cooking of kraft pulp in a single-vessel system (1), preferably a single-vessel hydraulic digester, with chips being conveyed from a high-pressure feeder (2) in a transfer line (2A, 4A) to a first e...
02/29/2000
5980689Method of separating metal ions from pulp using a chelating agent
Methods for separating metal ions from pulp material are disclosed including treating the pulp with a chelating agent to produce a pulp flow with dissolved metal ions, washing that pulp flow prior to bleaching with hydrogen peroxide or ozone and mixing th...
11/09/1999
5925216Method of continuous pulping in a digester with high black liquor usage in the impregnation stage
The present invention provides a method for continuously cooking kraft pulp in a digester having the steps of: feeding chips into an inlet of a digester; supplying black liquor to an impregnation zone of the digester in an amount such that the black liquor mak...
07/20/1999
5882477Continuous digester with a low temperature gas-phase
A cellulose pulp continuous digester (e.g. for producing kraft pulp) is operated so that it has the advantages of a hydraulic digester yet has a gas-filled zone over the liquid level. A slurry of chips and cooking liquor is introduced into the top of the ...
03/16/1999
5824187Method for the continuous cooking of pulp
The present invention relates to a method for continuously producing pulp in which finely divided fiber material, preferably wood chips, is impregnated in an impregnation vessel (10), preferably by being fed in at the top (14) and fed out from the bottom ...
10/20/1998
5716497Method and device for the continuous cooking of pulp
A novel method and device for the production of pulp by a continuous cooking process is provided wherein hot impregnated chips are fed into the top of a countercurrent steam digester which has a bottom outlet and at least one draw off screen girdle for re...
02/10/1998
5705032Black liquor viscosity control
Black liquor is subjected to high shear to cause a breakdown of macromolecules contained therein and provide a reduction in viscosity, thereby improving the processability of the black liquor and enabling the solids content to be increased....
01/06/1998
5676795Process for the production of viscose pulp
The present invention relates to a process for producing viscose pulp from lignocelluloses, such as hardwood, softwood or annual plants, in which process the lignocellulose is treated in a digester at first with saturated steam to prehydrolyze hemicellulo...
10/14/1997
5674359Continuous cooking of cellulosic fibrous material with cold alkali impregnation
The pretreatment of cellulosic fibrous material is adjusted to improve pulp strength. The cellulosic material is initially pretreated with a low temperature alkaline liquid (e.g. 80°-110° C.), and then with a higher temperature (but still below cooking ...
10/07/1997
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