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7520958 |
Modified kraft fibers
A method of producing a modified pulp comprising treating wood chips in an extraction process to remove hemicellose to form treated wood chips; and subjecting said treated wood chips to chemical or...
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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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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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7368036 |
Xylanase treatment of chemical pulp
The present invention discloses methods of bleaching chemical pulp that use xylanase enzymes after chemical bleaching. The method comprises the steps of carrying out a chlorine dioxide stage to...
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7294227 |
Method and system for the treatment of pulp prior to ozone bleaching
A system for treating pulp comprises a dewatering device ( 2 ) for dewatering the pulp to a fiber concentration of at least 20%, a closed pulp-shredding vessel ( 16 ) for shredding the dewatered...
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7282115 |
Method 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.
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7267744 |
Pulp treatment and process
This invention provides a process for treating chemical woodpulp, or chemical cellulose including cotton linter, including the step of applying an electron processing technology (EPT) step to...
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7214291 |
Method for the modification of cellulose fibres
The invention relates to a method for the modification of cellulose fiber with the object of increasing the strength properties of the pulp. Cellulose derivative, preferably in the form of CMC, is...
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7189306 |
Process of treating lignocellulosic material to produce bio-ethanol
This invention relates to a process of treating a lignocellulosic material to produce bio-ethanol. The process includes the steps of: (a) exposing the lignocellulosic material to conditions...
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7182835 |
Two-stage chlorine bleaching process with filtrate recirculation
Methods for bleaching chemical pulp are disclosed including dewatering the pulp to a concentration of from 25 to 40%, bleaching in a first chlorine dioxide stage, followed by a second alkaline...
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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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7097740 |
Method and screen for screening at least two pulp mixtures
The invention relates to a method and a screen for screening two or more pulp mixtures with different roughness. The screen comprises a first screen cylinder and a second screen cylinder. A coarse...
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7090744 |
Process for making composition for conversion to lyocell fiber from sawdust
A process for making a composition for conversion to lyocell fiber where the process comprises pulping a raw material in a digester to provide an alkaline pulp, wherein the raw material comprises...
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7083704 |
Process for making a composition for conversion to lyocell fiber from an alkaline pulp having low average degree of polymerization values
The present invention provides compositions, useful for making lyocell fibers, having a high hemicellulose content, a low copper number and including cellulose that has a low average degree of...
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7022837 |
Cellulose ethers and method of preparing the same
The present inventors have discovered that the solution rheology of cellulose ethers prepared from cellulose pulp is altered by mercerizing and recovering cellulose pulp before preparing the...
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7014684 |
Method for the treatment of waste gas from a cellulose plant
A process and a device for cleaning waste gas from pulp production, especially for cleaning waste gases from a bleaching reactor. Aerosols contained in the waste gas are removed and the gaseous...
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6946057 |
Alkaline process for the manufacturing of pulp using alkali metaborate as buffering alkali
The present invention relates to a new and environmentally sound process for the manufacturing of a chemical pulp from lignocellulosic material with an integrated recovery system for recovery of...
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6942754 |
Process for producing xylooligosaccharide from lignocellulose pulp
Xylooligosaccharide is produced from a lignocellulose pulp by enzyme-treating a lignocellulose pulp with hemicellulase, filtering the resultant reaction mixture to separate a liquid fraction from...
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6861023 |
Process for making lyocell fiber from sawdust pulp
A process for making lyocell fibers including the steps of pulping raw material in a digester to provide an alkaline pulp, wherein the raw material includes sawdust in an amount greater than 0% up...
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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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6824646 |
Process for oxygen bleaching and enzyme treating lignocellulosic pulp with liquid treatment and recovery
Lignocellulose pulp is bleached by bleaching a pulp in aqueous alkali solution with oxygen and treating the pulp with a hemicellulase, while a liquid fraction delivered from the enzyme treatment...
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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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6776876 |
Method of treating cellulosic pulp to remove hexenuronic acid
Chemical cellulose pulp produced by alkaline delignification and having a kappa number of under 24 (e.g. 14 or below) having hexenuronic acid is treated to remove at least 50% of the hexenuronic...
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6773547 |
Process for the bleaching of low consistency pulp using high partial pressure ozone
Provided is a process for bleaching pulp with ozone. The process involves preparing a slurry of cellulosic pulp having a consistency in fibers of from 1 up to 5 weight %. Such a low consistency...
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6770168 |
Process for oxygen pulping of lignocellulosic material and recorvery of pulping chemicals
A substantially sulfur free process for the manufacturing of a chemical pulp with an integrated recovery system for recovery of pulping chemicals is carried out on in several stages involving...
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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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6733625 |
Method and apparatus for treating pulp
The present invention relates to a method of treating chemical pulp in order to optimize the consumption of bleaching chemicals and to improve the quality of the pulp. Especially the invention...
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6706143 |
Minimizing chlorinated organics in pulp bleaching processes
The invention relates to methods for reducing the amount of halogenated organics produced during a halogen bleaching process for lignocellulosic pulp fibers. According to the disclosed invention,...
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6699358 |
Method for brightening chemical pulp with hydrogen peroxide using a magnesium compound in silicate solution
A method for brightening chemical pulps with less than 18% lignin utilizing a magnesium compound in a sodium silicate solution to form a higher percentage of high molecular weight silicates. Such...
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6679972 |
Process for the bleaching of a pulp suspension by separating calcium from lignin
A process for the bleaching of lignin present in pulp fibers in an aqueous environment such as a pulp suspension. The invention also relates to a process for producing paper or board from pulp...
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6660128 |
Oxidase process for pulp
A method for selectively delignifying lignocellulosic materials and bleaching of pulp and dyes using a combination of an oxidative enzyme and a metal complex. More specifically, the process...
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6627041 |
Method of bleaching and providing papermaking fibers with durable curl
A process for bleaching high bulk cellulosic fiber and producing a durable elevated curl index includes: (a) concurrently bleaching, heat treating and convolving cellulosic fiber pulp at elevated...
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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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6605181 |
Peroxide bleach sequence including an acidic bleach stage and including a wash stage
A method and device for bleaching chemical paper pulp or dissolving wood pulp, which has been cooked and delignified without employing chlorine-containing chemicals, comprising a bleaching sequence...
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6579412 |
Process for ozone bleaching of low consistency pulp
Provided is a process for bleaching pulp with ozone. The process involves preparing a slurry of cellulosic pulp having a consistency in fibers of from 1-5 weight %. Such a low consistency slurry is...
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6579411 |
Bleaching medium consistency pulp with ozone
A method of bleaching cellulose pulp with ozone includes pumping cellulose pulp in form of a fiber suspension having a consistency range of 5 to 25% with a high-consistency pump to a fluidizing...
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6569284 |
Elemental-chlorine-free bleaching process having an initial Eo or Eop stage
The specification discloses an improved bleaching sequence which provides significant reduction in filtrate volumes and amounts of absorbable organic halide (AOX), color, and chemical oxygen demand...
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6547923 |
Process for bleaching medium consistency pulp with ozone using a pressurized fluidizing mixer
A method of bleaching cellulose pulp with ozone includes pumping cellulose pulp in form of a fiber suspension having a consistency range of 5 to 25% with a high-consistency pump to a fluidizing...
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6514380 |
Treatment of chemical pulp
Chemical pulp is produced by cooking comminuted cellulosic fibrous material (e.g. wood chips) in a continuous digester or batch digesters or produce brown stock, and washing the brown stock in a...
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6491788 |
Process for making lyocell fibers from alkaline pulp having low average degree of polymerization values
The present invention is directed to a process for making a lyocell fiber by contacting an alkaline pulp having cellulose and at least about 7% hemicellulose under alkaline conditions with an...
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6458242 |
Ozone bleaching process using oxalic acid addition
Processes are disclosed for bleaching pulp with ozone in an environmentally friendly bleaching plant. The processes include removing a first filtrate from the pulp, bleaching the treated pulp with...
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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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6432266 |
Process for bleaching chemical pulp simultaneously with chlorine dioxide, peroxide and a reaction catalyst
A process for bleaching chemical pulp for paper manufacturing comprising delignifying and bleaching chemical pulp which has been treated by cooking by simultaneous use of chlorine dioxide, a...
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6432263 |
Process for increasing the water retention capacity in fibrous webs
Process for increasing the water retaining ability of fibrous paper stocks. The process includes knead dispersing a fibrous paper stock having a stock concentration of at least about 20% and a...
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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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6398908 |
Process for acid bleaching of lignocellulose-containing pulp with a magnesium compound
A process for delignification and bleaching of chemically digested lignocellulose-containing pulp. In a first embodiment, the pulp is acid treated at a pH of between about 1 and about 6, whereupon...
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6387211 |
Methods for reducing fluorescence in paper-containing samples
The present invention provides methods for reducing fluorescence in a paper-containing sample. Methods for destroying fluorescent whitening agents in a paper-containing sample are also provided.
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6379495 |
Process for the production of cellulose paper pulps by biodelignification of vegetative masses
Process for the production of cellulose paper pulps from vegetable masses, comprising the steps of mixing and conditioning a vegetative mass suitable to form a culture medium with an inoculum...
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6375797 |
Bleaching chemical pulp in a PkDQ-Po Sequence
In a method and apparatus for treating pulp, a peroxide treatment of chemical pulp, i.e., both sulphite pulp and kraft pulp, is used to quickly reduce the Kappa number of the pulp. The method...
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6358363 |
Method and apparatus for bleaching pulp using two fluidizing mixers
A method and apparatus for bleaching medium consistency pulp with ozone using at least 2 fluidizing mixers to mix ozone and carrier gas into the pulp. The method is particularly applicable when the...
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