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8007636 |
Method of treating cellulose fibres with chlorine dioxide and an alkyl cellulose derivative
The present invention relates to methods of modifying cellulose fibers and of producing paper which methods include providing a pulp suspension of cellulose fibers and adding a cellulose derivative...
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7824556 |
Methods for making chlorous acid and chlorine dioxide
Chlorous acid is generated from a chlorite salt precursor, a chlorate salt precursor, or a combination of both by ion exchange. The ion exchange material facilitates the generation of chlorous acid...
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7585387 |
Chemical oxidation for cellulose separation with a hypochlorite and peroxide mixture
An oxidative solution (Ox-B, a solution of no less than 5:1 sodium hypochlorite: hydrogen peroxide) was found to remove both lignin and hemicellulose from sugarcane bagasse. After treatment the...
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7377993 |
Methods for reducing fluorescence in pulp and paper
Methods for reducing, and in some cases eliminating, fluorescence in pulp and paper, as well as the resulting articles, are provided. The methods destroy fluorescent activity of agents (e.g.,...
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7264690 |
Catalyzer for clean pulping and process for using the same
A catalyzer for clean pulping includes sodium salicylate, anion silicate softener, cooking aids, liquid(gaseous) chlorine and water. A process for using the catalyzer for clean pulping includes the...
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6902649 |
Enhanced fiber additive; and use
The disclosure provides a process of modifying a seed based fiber (SBF) to form an enhanced fiber additive (EFA). The process includes an acid treatment step and optionally at least one fiber...
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6777103 |
Fiber cement composite material using biocide treated durable cellulose fibers
A fiber cement composite material providing improved rot resistance and durability, the composite material incorporating biocide treated fibrous pulps to resist microorganism attacks. The biocide...
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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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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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6273994 |
Method and device for measuring bleach requirement, bleachability, and effectivenss of hemicellulase enzyme treatment of pulp
The present invention relates to a device and method for measuring the bleach requirement and bleachability of pulp in a pulp mill. The invention enables pulp mill operators to better control...
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6235154 |
Chlorine dioxide bleaching in the presence of an aldehyde
A method which enhances the effectiveness of chlorine dioxide bleaching of lignocellulosic materials. It is effected by adding to the chlorine dioxide bleaching stage an aldehyde compound at a...
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6228213 |
Production of microcrystalline cellulose by reactive extrusion
This process involves feeding cellulose into an extruder with an acid solution. The extruder is comprised of a screw and a barrel. The screw is rotated so as to pressurize the cellulose, and the...
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5900113 |
Method of using fluorescent tracers to monitor chlorine dioxide in pulp and paper processes
The present invention provides a method of monitoring a papermaking system and unit operations contained therein to optimize the overall papermaking process. The method comprises employing a...
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5662773 |
Process for preparation of cellulose acetate filters for use in paper making
The present invention discloses a process for treating filter rods comprising cellulose acetate tow waste comprising the steps of: a. cutting said filter rods so that fiber of said cellulose...
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5618385 |
Method of peroxide bleaching of pulp using a peroxide decomposing inactivator
Chlorine dioxide is used to stabilize hydrogen peroxide in bleach liquor at alkaline pH. This is thought to be aided by the destruction of enzymes (especially catalase) produced by bacteria. The...
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5574088 |
Increasing the resistance of fiber material to oxidizing agents
A composition for increasing the resistance of polyamide fibers or polyester fibers to oxidizing agents comprising an organosiloxane modified with amino groups, melamine formaldehyde resin, a...
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5554535 |
White-rot fungus and uses thereof
The white rot fungus Scytinostroma galactinum strain F361 and mutants thereof are particularly effective in selectively grading the lignin component of lignin-containing materials, particularly...
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5358864 |
Cloning and expression of xylanase genes from fungal origin
Methods and expression constructs are provided for the cloning and overexpression of xylanases of fungai origin in a selected microbial host cell. Xylanases of fungal origin generally have lower pH...
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5330620 |
Bleaching pulp with chloric acid
A process for bleaching pulp which employs chloric acid as the oxidizing agent, in the absence of a transition metal catalyst.
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5273625 |
Method of treating bleached pulp on a washer with calcium ions to remove sodium ions
Method for treating chemically treated cellulosic pulp that contains sodium ions wherein the pulp is subjected to an ion exchange with a cation (preferably calcium) having a higher valence than the...
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5139613 |
Process for preparing a paper pulp using carbon dioxide as an acidifying agent for a bleached pulp
A process for souring chemical or mechanical cellulosic pulp using carbon dioxide to obtain proper acidification of the pulp slurry. The souring is performed after a single or a multistage...
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5013404 |
Process for alkaline peroxide bleaching of wood pulp using a quaternary amine as additive
A process for alkaline hydrogen peroxide bleaching of mechanical wood pulp which employs a quaternary amine compound, such as (3-chloro-2-hydroxypropyl)trimethyl ammonium chloride, in the...
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4956048 |
Method of alcohol washing brownstock pulp prior to a chlorination bleaching stage
In the method of chemical pulping of wood including a chlorination stage pulp bleaching step followed by alkaline extraction, a method of reducing the amount of dioxins and furans produced thereby...
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4740212 |
Process and composition for bleaching cellulosic material with hypochlorous acid
A process and composition especially suited for bleaching wood pulp characterized by the use of hypochlorous acid in combination with chlorine dioxide and/or a nitrogen compound having the...
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4702807 |
Electrochemical process for bleaching wood pulp using chlorate and a redox catalyst
An electrochemical process for delignification and bleaching of pulp fibers is disclosed. The process involves the use of metallic chlorates and vanadium catalysts in the presence of an electric...
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4537656 |
Method for delignifying or bleaching cellulose pulp wherein chlorine is added to recycle liquor to regenerate chlorine dioxide
A method for delignifying and/or bleaching cellulose pulp adds to the cellulose pulp a liquid which contains chlorine dioxide, causes the pulp to react with the chlorine dioxide over a selected...
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4487656 |
Process for bleaching paper pulp using melamine as a viscosity stabilizer
A process for maintaining pulp viscosity while enhancing brightness during the bleaching stage or stages of pulp preparation in the manufacture of paper comprising adding an effective amount of...
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4484980 |
Process for bleaching paper pulp using caffeine or guanine as a viscosity stabilizers
A process for maintaining pulp viscosity during the bleaching stage or stages of pulp preparation in the manufacture of paper comprising adding an effective amount of caffeine or guanine prior to...
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4480089 |
Modified cellulose products by bleaching
Modified cellulose products for use as carrier vehicles in forming cosmetics, pharmaceutical preparations, insecticides, etc. are prepared by treating a minimum weight ratio of about 10:1 of...
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4444621 |
Process and apparatus for the deresination and brightness improvement of cellulose pulp
A process and apparatus are provided for the deresination and brightness improvement of cellulose pulp, by adjusting the pulp concentration to within the range from about 15 to about 35%; adding...
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4298428 |
Use of additives in pulp bleaching processes to preserve pulp strength
Improved pulp strength and brightness of chemically produced pulp can be obtained by treating the pulp with the addition of 0.05-0.5% based on the weight of the dry fiber of certain amine materials...
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4295928 |
Phenolic compounds as viscosity preservatives during hypochlorite pulp bleaching
Improved pulp strength and brightness of chemically produced pulp can be obtained by treating the pulp with the addition of 0.05-0.5% based on the weight of the dry fiber of certain aromatic...
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4255233 |
Use of polyacrylic acid in pulp bleaching processes to preserve pulp strength and aid in brightness
Improved pulp strength and brightness of chemically produced pulp can be obtained by treating the pulp with the addition of 0.05--0.5% based on the weight of the dry fiber of polyacrylic acid...
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4244780 |
Use of thiourea dioxide in pulp bleaching processes to preserve pulp strength and aid in brightness
Inproved pulp strength and brightness of chemically produced pulp can be obtained by treating the pulp with the addition of 0.05-0.5% based on the weight of the dry fiber of thiourea dioxide in the...
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4244777 |
Bleaching stilbene yellow dyed wood pulp
Chlorine dioxide is a specific bleaching agent for stilbene yellow dye which has been used to dye paper stock. Chlorine dioxide may be used in amounts as low as 0.25% based on the oven dry weight...
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4222818 |
Method for treatment of lignocellulosic material with chlorine
A pulp containing lignocellulosic fibers is treated with chlorine in two steps. In the first step, chlorine in the amount of 0.6-0.9 grams per gram of lignin in the fibers, is mixed in the gaseous...
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4207140 |
Method of producing groundwood pulp
A process is provided for preparing groundwood pulp from debarked pulpwood logs, which comprises grinding the logs under a superatmospheric pressure of a gas selected from the group consisting of...
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4160693 |
Process for the bleaching of cellulose pulp
A process is provided for the bleaching of cellulose pulp, particularly for the peroxide bleaching of high yield pulp, which comprises forming a suspension of lignocellulosic pulp material; mixing...
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4098639 |
Process for reducing the requirement of fresh chemicals without increasing emissions in the pulping of cellulosic material
A process is provided for reducing the requirement of fresh chemicals without increasing emissions in the pulping of cellulosic material with alkaline sodium- and sulfur-containing-sulfate pulping...
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4096029 |
Cellulosic pulp delignification using an acidic bromine-chlorine mixture
Efficient lignin removal from cellulosic pulp with decreased cellulose degradation is attained by replacing chlorine with an acidic bromine-chlorine mixture in acidic chlorination of the pulp.
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4093506 |
Method and apparatus for effecting even distribution and mixing of high consistency pulp and treatment fluid
Method and apparatus for the continuous distribution and mixing of high concentration pulp with at least one treatment fluid such as chlorine or chlorine dioxide. An enclosed housing has a...
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4042452 |
Process for washing cellulose pulp from alkali digestion wherein acid is added to the washing solution
A process for washing a cellulose pulp from alkali digestion, wherein the pulp is fed into a multistage washing system comprising several countercurrently coupled washers, acid is added to a...
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4039374 |
Bleaching of cellulosic pulp fibers with chlorine dioxide in the presence of a vanadium compound
Cellulosic pulp fibers are bleached with chlorine dioxide in the presence of a vanadium compound containing vanadium in the +4 or +5 oxidation state so as to attain a final pH of less than about...
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4008120 |
Process of delignification and bleaching a lignocellulose product
The delignification and bleaching of lignocellulosic products is effected by mixing an aqueous suspension of the lignocellulosic product with a chlorine-containing substance and an...
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3976538 |
Method for bleaching of cellulosic pulp
A first portion of bleaching liquid is passed through cellulosic pulp in a bleaching zone at a first level with respect to the pulp feed direction and withdrawn through transversely spaced strainer...
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3897301 |
Recovery of papermaking solids for reuse, with an active chlorine-bearing chemical
Fillers and fine fibers are reclaimed from a paper mill sewer in a process involving dewatering and chemical treatment, using an active chlorine-bearing chemical, such that the drainage rate of the...
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3878037 |
Method of enhancing the hypochlorite bleaching of pulp
The present invention is directed to pulp bleaching processes, and in particular compositions for use in the bleaching process to enhance the efficiency of the process. It was discovered that if a...
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3539445 |
REDUCTION OF IRON CONTENT IN BLEACHING FIBROUS CELLULOSE
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3499823 |
METHOD OF INHIBITING THE FORMATION OF FIBER-KNOTS IN PAPER PULP AND PRODUCT
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3579419 |
TREATMENT OF FLUFFED PULP FIBERS WITH GASEOUS CHLORINE
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