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| Number | Title | Issue Date |
| 8172981 | Separating lignin from black liquor by precipitation, suspension and separation A method for controlling the sodium and sulphur balance of a pulp mill while separating lignin from black liquor, and also a lignin product or an intermediate lignin product obtainable by the method. The present invention also provides use of a lignin product or an ... | 05/08/2012 |
| 7699958 | Method for improving separation of carbohydrates from wood pulping and wood or biomass hydrolysis liquors A method for separating carbohydrates from pulping liquors includes the steps of providing a wood pulping or wood or biomass hydrolysis pulping liquor having lignin therein, and mixing the liquor with an acid or a gas which forms an acid upon contact with water to i... | 04/20/2010 |
| 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 |
| 7384501 | Method for improved turpentine recovery from modern cooking plants A method for the preparation of pulp by means of alkaline cooking, in which method spent liquor is transferred to pressurized tanks, and at least one liquor is expanded corresponding to a temperature difference of 1 to 5° C. The generated steam is led to turpentine... | 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 |
| 7351306 | Cooking of cellulose pulp in a cooking liquor containing pre-evaporated black liquor The method is for cooking of cellulose pulp in which the raw material, preferably in the form of chips, undergoes a successive elevation of temperature towards the cooking temperature while the chips are first impregnated with an impregnation liquor followed by cook... | 04/01/2008 |
| 7294225 | Process for production of synthesis gas in combination with the maintenance of the energy balance for a pulp mill A process (44) for the production of pulp and paper (28), recycling of cooking chemicals (3, 29), combustion of biomass (30, 37) and generation of heat and electric energy (27, 40) comprising a pulp and paper mill (28), in t... | 11/13/2007 |
| 7270794 | Process for recovering useful products and energy from siliceous plant matter In the process disclosed herein, siliceous plant matter is steeped in water, soaked in an aqueous solution containing a solute which solubilizes inorganic oxides, soaked in an aqueous solution containing an oxidizing solute, rinsed, dried and thermally pyrolyzed to ... | 09/18/2007 |
| 7229558 | Chromatographic separation method A method for fractionating a solution into two or more fractions. More particularly the invention relates to a method for fractionating a solution by a chromatographic simulated moving bed (SMB) process in which the dissolved substances present in the feedstock are ... | 06/12/2007 |
| 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 |
| 7183339 | Method for making dimensionally stable composite products from lignocelluloses This invention relates to a process for making dimensionally stable reconstituted composite products from lignocellulosic material. By treating lignocellulose with high pressure steam to decompose and hydrolyze the hemicellulose, cellulose and lignin fractions of th... | 02/27/2007 |
| 7097738 | Process for producing pulp The invention relates to a process for producing pulp from a fibre-based raw material using, as the cooking reagent, a solvent mixture which is based on organic acids and also contains furfural. The method is applicable to herbaceous plants, in particular. ... | 08/29/2006 |
| 7029553 | Urea sulfate and urea hydrochloride in paper and pulp processing The present invention relates to the use of urea sulfate or urea hydrochloride, or both, in process streams in the paper and pulping industries to control pH, to bring about flocculation or precipitation of various materials, and to replace all or part of the sulfur... | 04/18/2006 |
| 6955743 | Method for producing furfural, acetic acid and formic acid from spent pulp-cooking liquor The invention relates to a process for recovering and producing chemicals in a pulp production process where organic chemicals, such as formic acid and acetic acid, are used as cooking chemicals. The process of the invention is based on regeneration of cooking acids... | 10/18/2005 |
| 6939439 | Batch process for producing chemical pulp by removing and reintroducing calcium-containing spent liquor in the digester Methods for producing chemical pulp from lignocellulose-containing material in processes for kraft pulp production are disclosed including charging the lignocellulose-containing material to a digester, initially treating the lignocellulose-containing material with a... | 09/06/2005 |
| 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 |
| 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 modification step. Preferred EFA products and uses are described. ... | 06/07/2005 |
| 6821382 | Method and arrangement for cleaning contaminated condensate including a combined stripper/condenser A method and apparatus for cleaning condensate, produced during the production of cellulose pulp, including evaporation of spent liquor, utilizing a cleaning plant having several condensers, coupled in series. Process steam from the last evaporation stage and unclea... | 11/23/2004 |
| 6752903 | 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 through a filtration media to improve the overall efficiency of the process. ... | 06/22/2004 |
| 6632327 | Process for treating spent, waste, alkaline digestion liquor from paper pulping operations and product A water soluble, surface active, polymeric agent is mixed with digestion liquor, preferably with an additional surface active defoamer coagulant agent prior to or during acidification of the alkaline digestive liquor. This results in an easily separable, ... | 10/14/2003 |
| 6540871 | Method for processing black liquor sediment An apparatus and method are provided to reduce the size of solid clumps of material and thereby permit reuse of the material. In particular, the apparatus and method allow for reuse of sediment accumulated in a storage area for paper pulping byproducts. T... | 04/01/2003 |
| 6409882 | Tall oil refining improvement In a tall oil refining operating plant, a warm water loop is disclosed for cooling the tall oil heads fraction extracted from the crude tall oil, rather than the conventional use of cold water. This avoids condensation and the subsequent solidification of... | 06/25/2002 |
| 6245196 | Method and apparatus for pulp yield enhancement The process of the present invention purposefully precipitates a portion of the dissolved lignin onto pulp fibers to improve pulp yield of unbleached pulp. The resulting retention of lignin on the pulp creates an increase in pulp yield. Washing the pulp i... | 06/12/2001 |
| 6183597 | Method of producing a pulp from cellulosic material using formic acid and hydrogen peroxide A process for producing a pulp from cellulose-containing material, wherein the material is reacted with formic acid as the solvent, and cooked at approximately the boiling temperature of the solvent, whereby return condensation is used. Annual plants, dec... | 02/06/2001 |
| 6179958 | Method for continuous cooking of cellulose-containing fibre material A method for cooking chips, involving steaming the chips, impregnating the chips with impregnating liquid in an impregnation vessel, which impregnating liquid comprises fresh cooking liquid and spent liquor, extracting spent liquor from the impregnation v... | 01/30/2001 |
| 6165316 | Method and plant for separating soap from black liquor using a pressure screen An alkaline cellulose pulp pulping process treats soap and fiber-containing liquids to separate fibers from the liquids prior to further treatment of the liquids (e.g. by evaporation and combustion, or by cooking to produce tall oil). Black liquor contain... | 12/26/2000 |
| 6132555 | Method and arrangement for increasing evaporation capacity of a multi-stage evaporator of spent liquor in a pulp mill A method and arrangement for increasing evaporation capacity in a multi-stage evaporation plant of spent liquor of a pulp mill. The method includes increasing the pressure of vapor discharged from an evaporation stage by a separate booster, and supplying ... | 10/17/2000 |
| 6110323 | Methods of refining agricultural residues to absorbent cellulose, xylose, and plant nutrient liquor, and products produced by such methods A method of creating a number of separate product streams from an agricultural waste material, comprising: providing a starting material consisting of an agricultural waste material; hydrolyzing the starting material with an acid solution at atmospheric p... | 08/29/2000 |
| 6024833 | Process for removing metals and recovering a chelating agent from a bleach plant waste liquor Provided is a process for removing metals from a bleaching plant spent liquor and recovering a chelating agent which includes the steps of: heating a spent liquor containing a chelate comprising metals bound in a chelating agent to a temperature of at lea... | 02/15/2000 |
| 5989387 | Method for controlling chloride concentration in the flue gas of a recovery boiler A method for adjusting the chlorine equilibrium in a sulphate cellulose process, wherein part of the chlorine contained in the cycle is separated and removed. In the method, strong odour gases from the sulphate cellulose process are introduced into a soda... | 11/23/1999 |
| 5907066 | Treating methanol-containing waste gas streams A method wherein a methanol-containing waste gas stream, such as a pulp mill waste stream which contains methanol and other waste products, including methyl mercaptans, is passed in contact with a catalyst comprising certain supported metal oxides in the ... | 05/25/1999 |
| 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 recycled for reuse. This results in significant solvent and en... | 08/04/1998 |
| 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 single-phase mixture of alcohol, water and a water-immiscible ... | 03/24/1998 |
| 5730838 | Process for extracting pure, coarse grain silicic acid crystals from spent lye A process is disclosed for extracting pure, coarse-grain silicic acid crystals from silicic acid-containing spent lye in cellulose production, comprising adding coarse-grain silicic acid to alkalized spent lye, lowering the pH of the alkalized spent lye t... | 03/24/1998 |
| 5730877 | Method for fractionating a solution The invention relates to a method for fractionating a solution by a chromatographic simulated moving bed method in which the liquid flow is effected in a system comprising at least two sectional beds in different ionic forms. The fractions enriched with d... | 03/24/1998 |
| 5707490 | Method of recovering energy from waste liquors from pulp processes A method of recovering energy from waste liquors from cellulose pulp processes produces high quality superheated steam, a savings in material costs is achieved, and the utilization factor of the pulp mill is improved (that is the number of shutdowns for s... | 01/13/1998 |
| 5662774 | Adjusting the sulphur balance of a sulphate cellulose plant by heat treating black liquor in a last evaporation stage The invention relates to a method of adjusting the sulphur balance of a sulphate cellulose plant, in which method black liquor is concentrated and heat treated by keeping it at a temperature higher than the cooking temperature for a certain time period to... | 09/02/1997 |
| 5660685 | Gasifying black liquor with recycling of generated hydrogen sulphide gas to the gasifier A method of preparing a digesting liquor having high sulphidity from a spent liquor obtained from digesting cellulosic fiber material, optionally without a conventional causticizing step is provided. Thermal decomposition of the spent liquor is conducted ... | 08/26/1997 |
| 5637225 | Method for fractionating sulphite cooking liquor The invention relates to a method for the fractionation of sulphite cooking liquor by a chromatographic simulated moving bed system in which the liquid flow is effected in a system comprising at least two chromatographic sectional packing material beds. I... | 06/10/1997 |
| 5635024 | Process for separating lignins and dissolved organic compounds from kraft spent liquor Digestion liquor is used in the paper pulping process to dissolve lignins and free the cellulose fiber from raw wood chips. After pulping, spent digestion liquor is laden with lignins. Heretofore, it was known that lignins could be coagulated by acidifica... | 06/03/1997 |
