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| Number | Title | Issue Date |
| 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 |
| 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 |
| 7073974 | Process and apparatus for highway marking A system for forming and applying a coherent refractory mass on the surface of a road wherein one or more non-combustible materials are mixed with one or more metallic combustible powders and an oxidizer, igniting the mixture so that the combustible metallic particl... | 07/11/2006 |
| 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 |
| 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 |
| 6663749 | Method for regenerating sodium hydroxide by partial autocausticizing sodium carbonate containing smelt by reaction with borate A method is provided for the use of borates in the recausticization of alkali-containing liquors such as those produced in the chemical and semi-chemical pulping of wood and in the oxidation and bleaching of wood pulp. Sodium hydroxide is regenerated from... | 12/16/2003 |
| 6348128 | Method of increasing the causticizing efficiency of alkaline pulping liquor by borate addition A method is provided for improving causticizing efficiency in the conventional lime recausticization portion of an alkaline pulping process. Such processes are commonly used in the pulping and bleaching of wood and non-wood cellulose fiber materials. The ... | 02/19/2002 |
| 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 |
| 5635027 | Method of reducing the viscosity of a black liquor A method of recycling sodium-based salts used for digesting wood in a digester during the manufacture of pulp and paper. The method comprises collecting a black liquor from the digester, concentrating the black liquor, and adding a salt to the black liquo... | 06/03/1997 |
| 4778813 | Polymeric quaternary ammonium compounds, their preparation and use Novel capped polymeric quaternary ammonium compositions formed by reacting ionene type polymers with tertiary amines are useful as microbicides, corrosion inhibitors, debonding agents, flocculants, softeners, and demulsifiers.... | 10/18/1988 |
| 4767500 | Sulfite cooking method for the production of cellulose from materials containing lignocellulose with recovery of the cooking chemicals A sulphite cooking process is described for the production of pulp from materials containing lignocelluloses, with recovery of the cooking chemicals, in which the cooking, the blowing, the washing and the bleaching are performed sucessively. The waste liq... | 08/30/1988 |
| 4735683 | Process for preparation of potassium salts from pulp of lignocellulosic materials Described herein is a process for producing potassium salts from potassium-based liquors for pulping of lignocellulosic material. The process comprises the steps of (a) digesting lignocellulosic material with a potassium-base aqueous cooling liquor to obt... | 04/05/1988 |
| 4597830 | Method and pulping composition for the selective delignification of lignocellulosic materials with an aqueous amine-alcohol mixture in the presence of a catalyst A pulping liquor for the delignification of lignocellulosic materials is disclosed which avoids the use of sodium hydroxide and so avoids degradation of substantial portions of the cellulose component, and simultaneously avoids the use of sulphide or othe... | 07/01/1986 |
| 4504356 | Continuous process of removing silica from spent pulping liquors A continuous process of removing silica from spent pulping liquors (black liquors) which have been obtained by the alkaline digestion of annual plants. The spent liquor is preconcentrated and contacted with a CO2 -containing gas. The CO2 | 03/12/1985 |
| 4486394 | Alkali regeneration process The invention relates to an improvement in a method of regenerating alkaline or alkaline earth metal oxides or hydroxides from solution particularly in delignification processes wherein a suitable transition metal such as ferric oxide is burnt with the so... | 12/04/1984 |
| 4248662 | Oxygen pulping with recycled liquor Fibrous material is pre-steamed, impregnated with alkali liquor, refined, and then oxygen pulped at a low consistency (about 3 to 8 percent solids) using an alkali liquor which contains boron compounds. The pulping step of the process is carried out in st... | 02/03/1981 |
| 4116759 | Preparation of liquor for delignification or alkali treatment by autocaustization, and the preparation of pulp with this liquor A method for the regeneration of pulping or bleaching chemicals from spent liquor containing salts of polybasic organic acids. The liquor is evaporated and then burned so that organic matter will be discharged as carbon dioxide and water, and a carbonate ... | 09/26/1978 |
| 4070233 | Process of the pulping of bleaching of vegetable material A pulping process which includes the steps of oxidizing vegetable materials with an oxidizing chemical selected from the group comprising Cl2, Cl2 O,ClO.sub. 2, Mg(ClO)2, Mg(ClO2)2 Mg.(ClO.sub. 3) | 01/24/1978 |
