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7182836 |
Method for delignifying lignocellulosic raw materials
The invention relates to a method for delignifying lignocellulosic raw materials by using sulfites in the presence of an alkaline component, especially sodium hydroxide or sodium carbonate or a...
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7081183 |
Method of deresinating pulp using alkyl alcohol alkoxylate surfactants
This invention is a method of reducing the resin content of chemical pulps comprising heating wood chips in an aqueous alkaline medium in the presence of an effective deresinating amount of an...
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6923887 |
Method for hydrogen peroxide bleaching of pulp using an organic solvent in the bleaching medium
Disclosed is a method for pulp bleaching. The method comprises the steps of providing a pulp sample for bleaching, the pulp sample stemming from a pulp producing process, providing a bleaching...
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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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6740199 |
Process for digesting woodchips with a sultaine and a polyglycoside
The invention relates to a process for digesting woodchips used in papermaking. The process employs digester additive, which comprises a sultaine or mixtures of a sultaine with a nonionic...
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6719880 |
Process for producing paper and absorbent products of increased strength
A process for producing paper and absorbent products of increased strength includes extracting wood particulates with a solvent selected from methanol, ethanol, and acetone at a pressure less than...
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6706144 |
Method of dewatering pulp
A method of dewatering an aqueous cellulosic pulp slurry comprising adding to an aqueous slurry of washed cellulosic pulp an effective dewatering amount of a mixture of one or more nonionic...
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6649023 |
Process for digesting woodchips and digester additives
The invention relates to a process for digesting woodchips used in papermaking. The process employs a digester additive, which is a mixture of (a) a polyglycoside, and (b) a polyoxyalkylene glycol....
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6641699 |
Chemical wood pulping process with reduced pitch and VOC emissions
A chemical wood pulping process having reduced volatile organic compound emissions includes extracting wood particulates with solvent at a pressure less than 50 psi to reduce naturally-occurring...
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6599326 |
Inhibition of pulp and paper yellowing using hydroxylamines and other coadditives
Chemical pulps or papers, especially kraft pulps or papers, which may still contain traces of lignin, have enhanced resistance to yellowing when they contain an effective stabilizing amount of a...
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6596908 |
Process for the recovery of low molecular weight phenols, furfural, furfuryl alcohol and/or cellulose or cellulose-rich residues
A process for the recovery of furfural, furfuryl alcohol, low molecular weight phenols and/or cellulose or a cellulose-rich material from a lignocellulosic material comprising: feeding a carrier...
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6524435 |
Method and composition for dispersing hydrophobic particles in aqueous suspensions
A method of dispersing hydrophobic particles in aqueous suspensions comprising adding to the suspension an effective amount of an ethylene oxide-propylene oxide block copolymer, wherein the...
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6500303 |
Inhibition of pulp and paper yellowing using nitroxides, hydroxylamines and other coadditives
Pulps or papers, especially chemimechanical or thermomechanical pulps or papers, which still contain lignin, have enhanced resistance to yellowing when they contain an effective stabilizing amount...
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6432262 |
Method of bleaching recycled papers with hydrogen peroxide stabilized with a methylolhydantoin
A method of stabilizing hydrogen peroxide in an aqueous solution, such as a circulating water slurry, comprising a peroxide, such as hydrogen peroxide. The aqueous solution may include organic...
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6364999 |
Process for producing a wood pulp having reduced pitch content and process and reduced VOC-emissions
Paper and absorbent products having reduced pitch content and enhanced properties, including increased tensile index, tear index, burst index, Scott Bond, smoothness, and stiffness. Further, pulps...
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6217711 |
Method of treating condensates
A method of treating cellulose pulp mill condensates having an MeOH content using an evaporator and a steam stripper having a reboiler, comprising: (a) Collecting a feed liquor stream having at...
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5914004 |
Method of producing pulp for paper manufacture
The present invention is related to a method of producing paper pulp from a fibrous raw material. According to the invention, such pulpwood is used in which the content of phenol compounds or...
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5876559 |
Deinking of impact and non-impact printed paper by an agglomeration process
Deinking of impact and nonimpact printed paper is accomplished by repulping the printed paper in an alkali aqueous medium containing a deinking composition comprising one or more nonionic...
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5871614 |
Process for reducing anthraquinone requirements in pulping of lignocellulosic material
An improved process for delignification of lignocellulosic raw material, such as wood chips, for the production of cellulose pulps for use in the manufacture of paper or paperboard and an improved...
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5865948 |
Method for steaming comminuted cellulosic fibrous material during continuous solvent pulping
A continuous solvent pulping process is practiced with oxygen free gas (e.g. nitrogen) purges of all major treatment vessels during the time when the process is arrested or terminated. The wood...
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5788812 |
Method of recovering furfural from organic pulping liquor
This invention provides for the recovery of lignin and other by-products from the pulping of fibrous plant material. In accordance with this invention, solvents and filtrates are recovered and...
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5730837 |
Method of separating lignocellulosic material into lignin, cellulose and dissolved sugars
A method for separating lignocellulosic material into (a) lignin, (b) cellulose, and (c) hemicellulose and dissolved sugars. Wood or herbaceous biomass is digested at elevated temperature in a...
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5685953 |
Ozone bleaching with an organic solvent and mineral acid
A bleached pulp having a high viscosity for a given permanganate number is formed by pretreating never dried pulp with an organic solvent medium to produce a treated pulp composed of said never...
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5681427 |
Apparatus for treating pulp produced by solvent pulping
An apparatus and process for the solvent pulping and washing of pulp using vessels purged of oxygen free gas when the process is arrested or terminated. The washing is accomplished by first...
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5672244 |
High temperature deinking method using an alkylene oxide adduct
In the deinking of feed waste papers comprising magazines and newspapers at a weight ratio of magazine to newspaper of from 5/95 to 60/40, a reclaimed pulp with excellent qualities can be obtained...
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5632860 |
Method of controlling foam in aqueous systems
A method for controlling foam in the papermaking operation comprising a polyether surfactant and polyethoxylated sorbitol hexaoleate.
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5609723 |
Oxygen bleaching process for cellulocis pulps with a polyhydric alcohol cellulose protector
An improved oxygen bleaching process wherein the pulp is bleached in an aqueous organic medium wherein a polyhydric alcohol constitutes between 10 and 70% by weight of the medium to produce a pulp...
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5607544 |
Process and agent for the oxidative bleaching of wood pulp and for deinking waste paper
The present invention provides a process for the oxidative bleaching of wood pulps and for deinking waste paper by means of hydrogen peroxide and a stabilizing agent, wherein, as stabilizing agent,...
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5575893 |
Felt conditioner for deinked recycled newsprint papermaking system
A method for conditioning the felts in a papermaking process utilizing deinked secondary fiber in the furnish by adding a felt conditioner consisting of from 5-33% of a nonionic surfactant, from...
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5562862 |
Polybutene-based foam control composition for aqueous systems
A stable defoamer composition and method of defoaming an aqueous system is disclosed. The composition comprises an alcohol alkoxylate, at least one surfactant having a melting point less than 20°...
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5527427 |
High solids black liquor of reduced viscosity and viscosity reduction method for high solids black liquor
A high solids black liquor which has solids content of at least 65% by weight of liquor is mixed with a viscosity reducing additive prior to firing in a chemical recovery furnace. The additive is...
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5507913 |
Solvent recovery in pulp bleaching with ozone
A process for bleaching pulp by impregnating the pulp with an aqueous organic solvent medium and then bleaching in an ozone stage (Z stage) to form a bleached pulp characterized in that organic...
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5500082 |
Deinking of xerographic printed wastepaper using long chain alcohol
Disclosed is a method of removing ink from xerographically printed paper. The method comprises pulping said printed paper in an aqueous slurry at a non-acidic pH to a consistency of about 8% or...
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5470433 |
Process for the delignification of cellulose fiber raw materials using alcohol and alkali
A process for the delignification of cellulose fiber plant raw material for the production of pulp using separate impregnating and delignifying stages, each using alcohol and alkali. The process...
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5405498 |
Method for improving pulp washing efficiency
A process for enhancing pulp washing efficiency is disclosed. An anionic surfactant is added within the washing or pulping operation to enhance the removal of lignin and spent cooking chemicals...
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5342483 |
Process for deinking paper using water-soluble alcohols
A process for deinking wastepaper by combining a water-miscible organic solvent with inked paper to create a solvent/paper slurry, agitating the solvent/paper slurry to assist in releasing ink from...
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5338405 |
Production of fiber pulp by impregnating the lignocellulosic material with an aqueous alcoholic SO.sub.2 solution prior to defibration
In a process for manufacturing chemo-mechanical and/or chemothermal-mechanical wood pulps, raw materials containing lignocellulose, such as wood shavings, wood chips, pre-ground wood or sawdust,...
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5283002 |
Antifoam/defoamer composition and method of use thereof in aqueous systems
A composition comprising a β-branched aldol ether alcohol having the structure: ##STR1## wherein X=5 to 8, at least one surfactant and water which is useful to prevent or reduce foam present in...
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5252183 |
Process of pulping and bleaching fibrous plant material with tert-butyl alcohol and tert-butyl peroxide
A process for producing bleached pulp from a fibrous plant material (e.g., wood), wherein the material is contacted with an alcohol solvent in a pulping zone to extract lignin from the fibrous...
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5188707 |
Process for chemically hardening wood
A method of hardening wood using a pulping agent for the chemical separation of lignin from cellulose in the wood without damage to either component. The pulping agent comprises the reaction...
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5127993 |
Method of enhancing green liquor semi-chemical pulp production
The present invention is directed to the use of certain ethoxylated compounds to increase the yield of green liquor semi-chemical pulping processes, the compound have the following structures:...
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5041192 |
Supercritical delignification of wood
An improved wood pulping process for the delignification of wood in a solvent wherein the solvent is a supercritical fluid under supercritical conditons and contains a delignification agent such as...
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4966650 |
Method for fractionation of lignins from steam exploded lignocellulosics to provide fractions with different properties
The chemical components of lignocellulosic material which have been dissociated by a steam explosion process can be extracted from the mixture of components using a solvent extraction process. 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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4952277 |
Process for producing kraft pulp for paper using nonionic surface active agents to improve pulp yield
A process for making paper and linerboard, employing certain nonionic surface active agents to increase the yield of kraft pulping. The surface active agents having the structural formula ##STR1##...
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4941944 |
Method for continuous countercurrent ogranosolv saccharification of comminuted lignocellulosic materials
A method for the continuous countercurrent production of lignins and sugars from wood and other ligno cellulosic materials by organosolv delignification or saccharification at elevated temperatures...
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4941943 |
Process for preparing sodium carboxy-methyl cellulose
The invention relates to a method and an equipment for preparing NaCMC, in which (a) cellulose is slushed in the reaction medium until a consistency of c. 5-15%, preferably 5-10%, (b) the fibre...
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4908099 |
Process to dissociate and extract the Lignin and the Xylan from the primary wall and middle lamella or lignocellulosic material which retains the structural integrity of the fibre core
A process for the separation of the fibres from each other in lignocellulosic (straw, bagasse, wood) composites, and at the same time to dissociate the Lignin and the Xylan in the middle lamella...
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4908098 |
Method for extracting the chemical components from dissociated lignocellulosic material
The chemical components of lignocellulosic material that have been dissociated by a stream explosion process can be extracted from the mixture of components using a solvent extraction process. The...
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4904342 |
Process for pulping lignocellulose-containing material
A process for the pulping of lignocellulose-containing material, wherein the material is contacted with a pulping medium containing at least 75% by weight of a solvent system, which solvent system...
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