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| Number | Title | Issue Date |
| 8038842 | Method for vapor phase pulping with alcohol, sulfur dioxide and ammonia A method for the fractionation of lignocellulosic materials into cellulose, hemicelluloses and lignin in a batch or continuous process in a treatment with vaporous mixture of aliphatic alcohol, sulfur dioxide and water. Cooking conditions are varied to get different... | 10/18/2011 |
| 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 |
| 7163564 | Method for brightening virgin mechanical pulp A method for brightening virgin mechanical pulp. The method comprises combining: (i) an aqueous solution comprising sodium borohydride and sodium hydroxide; and (ii) an aqueous solution comprising sodium bisulfite, in a chemical mixer and adding output of the chemic... | 01/16/2007 |
| 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 |
| 7018509 | Elimination of alum yellowing of aspen thermomechanical pulp through pulp washing This invention relates to an improved process for manufacturing bleached thermomechanical aspen pulp having reduced yellow after treatment with aluminum based chemicals such as alum which are used in paper making processes. In this improved process the pulp is washe... | 03/28/2006 |
| 7001484 | Peroxide bleaching of wood pulp using stabilizers and sodium hydrosulfide reducing agent A process for peroxide bleaching of mechanical or high yield pulp, the process comprising adding to a pulp slurry at least one stabilizer for stabilizing low valency states of transition metal ions in the slurry; subsequently adding caustic soda to said slurry simul... | 02/21/2006 |
| 6998015 | Method for reducing alkaline darkening of mechanical pulp containing a calcium carbonate filler A method is disclosed for reducing or inhibiting alkaline darkening of mechanical pulp caused by the presence of calcium carbonate filler during production; the method comprises adding a sulfite, or sulfur-containing reducing agent, especially a sulfite to the mecha... | 02/14/2006 |
| 6758942 | Process for bleaching pulp or paper A process for bleaching substantially lignin-free pulp or paper in a single-stage bleaching process or multi-stage bleaching process; comprising contacting said substantially lignin-free pulp or paper with an aqueous reductive bleaching solution comprising hy... | 07/06/2004 |
| 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 particulate pitch and volatile organic compound content with... | 11/04/2003 |
| 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 temperature and pressure at high consistency generally unde... | 09/30/2003 |
| 6623599 | Process for producing a paper web having calcium carbonate filler by introducing carbon dioxide to the pulp A papermaking process wherein calcium carbonate is included in a pulp suspension. The dissolution of the calcium carbonate in the papermaking system is substantially retarded by the introduction of carbon dioxide to said pulp suspension. The invention als... | 09/23/2003 |
| 6602385 | Method of improving the brightness of calcium carbonate filled paper A method of improving the brightness of calcium carbonate filled paper. The filled paper is dried and then bleached with an aqueous solution of a bleaching agent. The process may be used on all grades of paper that contain filler and is particularly usefu... | 08/05/2003 |
| 6447645 | Feeding cellulose material to a treatment vessel A feed system for a cellulose pulp treating vessel (such as a continuous digester) is not limited by the required L/W ratio of the pump feeding a wood chip slurry to a high pressure transfer device, the feed system may be kept at a low temperature to mini... | 09/10/2002 |
| 6428653 | Method of bleaching with formamidine sulfinic acid using a reducing agent to eliminate residual peroxide A process for final bleaching cellulose-containing pulp which has been subjected to previous bleaching with a peroxide compound. The process involves the sequential steps of exposing the pulp to an amount of a reducing agent in order to eliminate residual... | 08/06/2002 |
| 6348127 | Process for production of chemical pulp from herbaceous plants A process for production of chemical fibrous pulp for making paper, paperboard and other fibrous products from herbaceous plants, such as kenaf. Pulp from the herbaceous plant is made by a process which involves densification of pieces of all or part of t... | 02/19/2002 |
| 6325892 | Method of delignifying sulphite pulp with oxygen and borohydride A single stage method delignification process for pulps, preferably sulphite pulps. The improvement to conventional oxygen delignification process comprises in situ addition of a reducing agent substantially non-reactive with oxygen. The end result is a p... | 12/04/2001 |
| 6267841 | Low energy thermomechanical pulping process using an enzyme treatment between refining zones A low energy thermomechanical pulping process which employs an enzyme treatment stage between two low energy thermomechanical stages.... | 07/31/2001 |
| 6103059 | Process for delignification of a lignin containing pulp A process for modifying, breaking down or bleaching lignin, material containing lignin or like substances uses oxidation catalysts and suitable oxidizing agents wherein these catalysts are used in combination with aliphatic, cycloaliphatic, hetercyclic or... | 08/15/2000 |
| 6007678 | Process for delignification of lignocellulose-containing pulp with an organic peracid or salts thereof A process for the delignification and bleaching lignocellulosic-containing pulp, in which the pulp is delignified with an organic peracid or salts thereof, treated with a complexing agent, washed and subsequently bleached with a chlorine-free peroxide con... | 12/28/1999 |
| 5607546 | CTMP-process An absorbent, chemithermomechanical pulp produced from lignocellulosic material with a wood yield above 88%, a low resin content | 03/04/1997 |
| 5607547 | Method for reduced sulfur dioxide formation in refiner bleaching A method for eliminating the formation of sulfur dioxide in a refiner bleaching process is disclosed wherein a selected amount of a carbonate is added to the refiner contents at approximately the same time that sodium dithionite is added.... | 03/04/1997 |
| 5591304 | Method for the use of enzymes in bleaching paper pulp A method and apparatus for treating wood pulp that includes incompletely washed brownstock, in which the brownstock is treated at a pH range of approximately 7.0 to 9.0 with a hemicellulase enzyme preparation that has a pH optimum below 6.0. Also, a metho... | 01/07/1997 |
| 5562803 | Sequential bleaching of de-inked paper pulp with sodium bisulfite, dithionite and borohydride Paper pulp, especially recycled paper pulp which has been deinked, is bleached in a synergistic two-stage process first with sodium bisulfite and then with sodium borohydride. The borohydride is preferably added in an aqueous mixture with sodium hydroxide... | 10/08/1996 |
| 5560805 | Enhanced decolorization of waste paper with selected amines A method for bleaching pulp containing pulp from color dyed waste paper, wherein the method comprises bleaching the pulp with a bleaching chemical, especially sodium hydrosulfite, in the presence of a selected ethoxylated amine.... | 10/01/1996 |
| 5460697 | Method of pulping wood chips with a fungi using sulfite salt-treated wood chips A method of making a wood pulp is disclosed. Wood is first chipped into wood chips. The wood chips are treated with an amount of sulfite salt sufficient to inhibit indigenous microorganism growth. The treated wood chips are introduced into a bioreactor an... | 10/24/1995 |
| 5338405 | Production of fiber pulp by impregnating the lignocellulosic material with an aqueous alcoholic SO2 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, are first impregnated with an aqueous alcoholic SO2 | 08/16/1994 |
| 5338402 | Process for preparing a bleached chemithermomechanical pulp A process for preparing chemithermomechanical pulp comprising subjecting a lignocellulosic substance from which said pulp is to be formed to the simultaneous action of a sulfite and a reducing agent that is more electronegative than the sulfite ion during... | 08/16/1994 |
| 5338403 | Hydrolysis of resin in pulp with an enzyme and a hydrosulfite Resin can be hydrolyzed enzymatically during the reductive bleaching (e.g. with sodium dithionite) commonly used in pulp manufacture. The enzyme treatment necessitates little or no change of commonly used bleaching conditions.... | 08/16/1994 |
| 5298118 | Preparation of bleached chemithermomechanical pulp Bleached chemithermomechanical wood pulp having a high degree of whiteness is economically prepared by mechanically disintegrating and chemically digesting lignocellulosic material with sulfite at a temperature of at least 100°C. under saturated water va... | 03/29/1994 |
| 5169555 | Pulp bleaching solution A sodium borohydride/sodium hydroxide solution for dithionite generation contains sufficient levels of diethylene triamine pentaacetic acid to chelate metals in the dithionate generation process and also in a pulp bleaching process.... | 12/08/1992 |
| 5143581 | Method of peroxide bleaching of pulp pretreated with a sequestering agent then with a sulphite and reducing agent A process for the manufacture of high-yield pulps bleached with the aid of hydrogen peroxide in alkaline medium, which consists in subjecting the pulp to be bleached successively to: (a) a pretreatment with the aid of a sequestering agent for metal ions, ... | 09/01/1992 |
| 5139617 | Process for the production of a hemicellulose hydrolysate and special high alpha cellulose pulp A process for the production of a hemicellulose hydrolysate and special pulp through two steps, the first step comprising the prehydrolysis of the material and the second step the dissolving of the lignin contained in the prehydrolyzed material. According... | 08/18/1992 |
| 5129987 | Process for bleaching mechanical wood pulp with sodium hydrosulfite and sodium hydroxide in a refiner A paper pulp refining and bleaching process wherein the pulp is treated in one or more refiners with a sodium hydrosulfite bleach liquor in the presence of a strong alkali such as NaOH, whereby the bleaching solution has an alkaline pH, preferably 10 to 1... | 07/14/1992 |
| 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 sodium hydroxide, sodium sulfide and/or sodium bisulfate.... | 08/20/1991 |
| 5041237 | Aqueous solution containing sulphur dioxide and sodium in high percentages, its manufacture and use An aqueous solution containing sulphur dioxide and sodium in high percentages is obtained by bringing sulphur dioxide into contact with a recirculating aqueous solution of sodium hydroxide and previously absorbed sulphur dioxide to obtain a ratio between ... | 08/20/1991 |
| 4922989 | Treatment of mechanical pulp to remove resin Resin is removed from mechanical pulps, such as TMP, CTMP, and the like, in a quick and simple manner. Mechanical pulp at a consistency of about 7-20 percent (preferably 8-15 percent) is subjected to high turbulence. The high turbulence may be effected by... | 05/08/1990 |
| 4919755 | Process for bleaching Process for bleaching of materials, at which an aqueous solution of borohydride containing borohydride corresponding to from 15 to 35 percent by weight of sodium borohydride and hydroxylic ions corresponding to not more than 10 percent by weight of NaOH i... | 04/24/1990 |
| 4897155 | Method for producing low fines content pulp by subjecting cellulosic chips to low frequency compression-relaxation cycles A method for producing low fines content pulp having successive treatment stages in each of which compressive and shearing forces are applied to the cellulosic fiber while simultaneously one or more chemicals are added. Gradual breakdown of the fibers is ... | 01/30/1990 |
| 4889593 | Method of determining rapidly the concentration of the total sulphur dioxide and the lignosulphonate present in sulphite pulping process liquors A method of rapid determination of the concentrations of the total sulphur dioxide and the lignosulphonate present in sulphite pulping process liquors. The lignosulphonates are separated from compounds which form the total sulphur dioxide by means of an i... | 12/26/1989 |
| 4863564 | Method of bleaching high yield pulp by using dithionite ion and excluding oxygen A method is described for increasing the brightness of reductively bleached high yield pulps, comprising bleaching the pulps with a reductive bleaching solution under anaerobic conditions and maintaining the bleached pulps under anaerobic conditions durin... | 09/05/1989 |
