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| Number | Title | Issue Date |
| 7887672 | Method for making natural cellulosic fiber bundles from cellulosic sources A method for extracting such natural cellulosic fiber bundles from natural cellulose sources selected from the group consisting of cornhusk, cornstalk, switchgrass leaves, switchgrass stems, rice straw, sorghum leaves, sorghum stems, soybean straw, wheat straw, cott... | 02/15/2011 |
| 7396434 | Catalytic 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 |
| 7390378 | Method of curling fiber and absorbent sheet containing same A method of providing papermaking fibers with durable curl comprising: a) introducing papermaking fiber into a rotatable drum adapted for operation at elevated pressure; b) rotating the drum containing the papermaking fiber while maintaining: i) the fiber in aqueous... | 06/24/2008 |
| 7384502 | Process for impregnating, refining, and bleaching wood chips having low bleachability to prepare mechanical pulps having high brightness Wood chips having low bleachability are impregnated with a chemical liquor at a pH range of 7-12 in aqueous solution and the chemical liquor from the impregnated chips is drained, whereby extractives contained in the chips and consuming bleaching agents can be remov... | 06/10/2008 |
| 7364640 | Chemimechanical 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 |
| 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 pulp, and an outlet pipe (22) from the pulp-shredding ... | 11/13/2007 |
| 7285184 | Cellulosic fiber pulp and highly porous paper products produced therefrom A cellulosic pulp, method of producing the pulp, and associated paper product produced therefrom produced by providing mercerized cellulosic fibers and depositing a hemicellulose coating upon the mercerized fibers. The hemicellulose is deposited upon the fibers by c... | 10/23/2007 |
| 7226525 | Process for producing very low COD unbleached pulp A pulp product that has a low COD is comprised of an unbleached pulp that is soaked and washed in alkaline water for a sufficient time so that the COD after soaking and washing is less than or equal to 3.0 kg/1000 kg of dry pulp. The pulp is produced by repetitively... | 06/05/2007 |
| 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 added in association with alkali cooking and/or delignification of ce... | 05/08/2007 |
| 7195695 | Cross-linked cellulose fibers and method of making same The invention provides a method for preparing cross-linked cellulosic fibers. A sheet of cellulosic fibers treated with a caustic solution under non-mercerizing conditions is cross-linked with a solution containing polymeric polycarboxylic acid cross-linking agents.... | 03/27/2007 |
| 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 including a pH not less than about 8, and steam at a first pressure, to prod... | 03/13/2007 |
| 7186316 | Method for preparing pulp from cornstalk Disclosed is a method for preparing paper pulp from cornstalks comprising the steps of cooking, washing, screening, thickening, bleaching, beating and drying performed under moderate conditions which have little noxious effects on the environment. By using cornstalk... | 03/06/2007 |
| 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 mixture thereof in an aqueous solution at a high temperature and high pr... | 02/27/2007 |
| 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 optimal predetermined end-pH is obtained. This provides advantages in th... | 01/02/2007 |
| 7094318 | Chemically cross-linked cellulosic fiber and method of making same The present invention relates to cross-linked cellulosic fiber having improved absorbency characteristics when compared to conventional cross-linked fibers. The cross-linked cellulosic fiber is obtainable by reacting pulp in the sheet or fluff form with one or more ... | 08/22/2006 |
| 7094317 | Process of manufacturing and using highly refined fiber mass The present invention comprises an improved method for refining cellulose that produces a highly refined cellulosic material. The method comprises soaking raw material from primarily parenchymal cell wall structures in an aqueous solution which need not contain an a... | 08/22/2006 |
| 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 sawdust in an amount greater than 0 % up to 100 %; and contacting the ... | 08/15/2006 |
| 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 polymerization (D.P.) and a narrow molecular weight distribution. Further... | 08/01/2006 |
| 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 alkyl alcohol alkoxylate of formula RO[(CH2CHCH3O) | 07/25/2006 |
| 7081184 | Process for making a very low COD unbleached pulp A process for making a pulp product that has a low COD is comprised of soaking and washing pulp in alkaline water for a sufficient time so that the COD after soaking and washing is less than or equal to 2.0 kg/1000 kg of dry pulp. The process includes repetitively s... | 07/25/2006 |
| 7074300 | Cellulose fiber-based compositions and their method of manufacture The present invention comprises an improved method for refining cellulose that produces a highly refined cellulosic material. The method comprises soaking raw material in a mild NaOH using reduced temperatures and pressures, and refining the material with a plate re... | 07/11/2006 |
| 7074301 | Chemically cross-linked cellulose fiber and method of making same The present invention relates to cross-linked cellulosic fiber having improved absorbency characteristics when compared to conventional cross-linked fibers. The cross-linked cellulosic fiber is obtainable by reacting pulp in the sheet or fluff form with one or more ... | 07/11/2006 |
| 7052578 | Process employing magnesium hydroxide in peroxide bleaching of mechanical pulp Wood pulp is bleached using hydrogen peroxide as the oxidative bleaching agent in the presence of magnesium hydroxide or magnesium oxide. The bleaching process is carried out in the presence of magnesium hydroxide as the predominant, and preferably essential, source... | 05/30/2006 |
| 7029554 | Method for brightening pulp with hydrosulfite solution generated from borohydride and bisulfite A method for brightening pulp at a pH from 4.5 to 9. The method comprises the steps of: (a) combining an alkali metal borohydride, an alkali metal hydroxide, an alkali metal bisulfite and phosphoric acid to form a reducing solution; and (b) adding the reducing solut... | 04/18/2006 |
| 6991705 | Process for stabilizing the PH of a pulp suspension and for producing paper from the stabilized pulp The invention relates to a process for stabilizing the pH of a pulp suspension with buffering agents and to a process for producing paper from a stabilized pulp suspension. The alkalinity of the pulp suspension is increased by a combination of an alkali metal hydrox... | 01/31/2006 |
| 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 pulping chemicals. The process is carried out in several stages involvi... | 09/20/2005 |
| 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 liquor comprising water and an organic component as solvent components co... | 08/02/2005 |
| 6923888 | Process for recovering organic acids from bleaching liquors The invention relates to a process for treating bleaching liquors from pulping processes based on organic acids. The process is characterized in that inorganic acid, such as nitric acid, phosphoric acid and/or sulphuric acid, is added into a bleaching liquor obtaine... | 08/02/2005 |
| 6913672 | Methods for analyzing boron-containing alkaline pulping liquors Chemical species (e.g., metaborate, carbonate, hydroxide and sulfide) in a boron-containing alkaline wood pulping liquor sample are determined quantitatively by (i) subjecting a first aliquot portion of the sample to a primary acid titration analysis to derive multi... | 07/05/2005 |
| 6899790 | Method of providing papermaking fibers with durable curl A process for producing high bulk cellulosic fiber exhibiting a durable elevated curl index includes: (a) concurrently heat treating and convolving cellulosic fiber pulp at elevated temperature and pressure at high consistency under conditions selected so as to prec... | 05/31/2005 |
| 6881299 | Refiner bleaching with magnesium oxide and hydrogen peroxide Methods of bleaching mechanical pulp under alkaline conditions with hydrogen peroxide. The methods include introducing a source of magnesium ions and hydroxyl ions to a refiner. The wood particulates are refined into a pulp in the presence of the magnesium ions and ... | 04/19/2005 |
| 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 to 100%; contacting the alkaline pulp including cellulose and at leas... | 03/01/2005 |
| 6814759 | Stable zeolite/cellulose composite materials and method of preparation Stable cellulosic fiber material for use in forming zeolite/cellulose composites is prepared by suspending loose cellulose fibers in an aqueous solution of sodium hydroxide, potassium hydroxide or sodium silicate, stirring the resulting suspension until it reaches a... | 11/09/2004 |
| 6797113 | Use of thinnings and other low specific gravity wood for lyocell pulps method The use of low specific gravity wood from thinning operations, for example, will produce a lower brownstock viscosity for a given kappa number target. A differential of 200-cP falling ball pulp viscosity has been detected from Kraft cooks of low and high specific gr... | 09/28/2004 |
| 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 treated fibers have biocides attached to inner and outer surfaces of i... | 08/17/2004 |
| 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 physical and chemical treatment of lignocellulosic material in order to in... | 08/03/2004 |
| 6752902 | Preparation of chemical pulp and xylose, utilizing a direct acid hydrolysis on the pulp The invention relates to a method of preparing chemical pulp and xylose by the use of alkaline or neutral cooking and post hydrolysis of the pulp by performing the post hydrolysis directly on the pulp by means of acid treatment. In the method of the invention, the x... | 06/22/2004 |
| 6743332 | High temperature peroxide bleaching of mechanical pulps A method of making bleached mechanical pulps is disclosed for pulping mills having a primary and a secondary refiner. A first step is to provide cellulosic materials, such as wood chips to refine into the pulp; the wood chips have an initial brightness level. A seco... | 06/01/2004 |
| 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 surfactant selected from the group consisting of (a) polyglycosides, (b) polyo... | 05/25/2004 |
| 6719878 | Method for avoiding mechanical damage of pulp A method for producing chemical pulp from cellulosic material by means of alkaline cooking, including cooking the material to pulp at cooking temperature in a digester, reducing the temperature at the end of the cook, substantially relieving the overpressure in the ... | 04/13/2004 |
