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| Number | Title | Issue Date |
| 7465372 | Method for treatment of spent liquor Method for treatment of spent liquor at a pulp mill, in which method at least a part of the spent liquor flow arriving from the evaporation plant is taken to a pyrolysis reactor, wherein it is pyrolysed at a temperature of 300-800° C. in order to separate evaporabl... | 12/16/2008 |
| 7371307 | Kraft pulp yield by heat treatment of polysulphide liquors generated by oxidation Oxidized white liquor is heat treated to increase the concentration of polysulphide measured at 285 or 286 nm (PSUV) or measured at 416 nm (PSVIS) and the PSUV/PSGR or PSVIS/PSGR ratio, whereby the co... | 05/13/2008 |
| 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 |
| 7341102 | Flue gas injection for heavy oil recovery A variety of methods for thermal recovery of natural gas and bitumen from a formation containing the latter. In general, the methods incorporate a series of existing, but previously uncombined technologies. A modified flue gas from the steam generators conventionall... | 03/11/2008 |
| 7332002 | Low sulfur coal additive for improved furnace operation The present invention is directed to additives for coal-fired furnaces, particularly furnaces using a layer of slag to capture coal particles for combustion. The additive(s) include iron, mineralizer(s), handling aid(s), flow aid(s), and/or abrasive material(s). The... | 02/19/2008 |
| 7300542 | Method for inhibiting calcium salt scale Compositions and method of improving inhibition of calcium salt scale formation under the conditions found in chemical pulp processes in which an effective amount of selected phosphonates or phosphonate blends is admixed with the black liquor composition recovered f... | 11/27/2007 |
| 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 |
| 7279017 | Method for converting heavy oil residuum to a useful fuel A method for enabling the use of heavy oil residuum by conversion to a useful product. The method, in one embodiment, involves the use of a heavy oil residuum which is substantially non flowable. The viscosity of the residuum is reduced by heat or a combination of h... | 10/09/2007 |
| 7270726 | Method for the production of green liquor The method is for production of green liquor in association with a causticizing process during recovery of chemicals in manufacture of sulphate pulp. A smelt (14) of chemicals principally consisting of Na2S and Na2CO3 from a soda boiler ... | 09/18/2007 |
| 7231714 | Corrosion-resistant exterior alloy for composite tubes An austenitic Ni—Cr—Fe alloy is provided as an exterior tube material for improved cracking and corrosion resistance of composite tubes used to construct the lower furnace section of kraft recovery boilers. The alloy consists of essentially, on a weight-% basis,... | 06/19/2007 |
| 7179437 | Feeding device and process and feeding system which utilize the feeding device Feeding device for feeding burned lime to a reaction vessel for causticizing a soda liquor to caustic soda. The feeding device, in its upper part, comprises an inlet for a slurry of the burned lime and the soda liquor for formation of said slurry inside said feeding... | 02/20/2007 |
| 7172677 | Method for inhibiting calcium salt scale Compositions and method for improving inhibition of calcium salt scale formation under the conditions found in chemical pulp processes in which an effective amount of selected phosphonates or phosphonate blends is admixed with the aqueous digester composition in a c... | 02/06/2007 |
| 7097739 | Method for the production of improved pulp Compositions and method for improving properties of pulp produced or reducing the digester cycle time in alkaline chemical pulping processes in which an effective amount of at least one selected phosphonate or carboxylate compound or mixtures thereof is admixed with... | 08/29/2006 |
| 6945181 | Method for combusting an organic waste concentrate containing alkali metal compounds under oxidative conditions The invention relates to a method for combusting an organic waste concentrate, which contains alkali metal compounds, under oxidative conditions for recovering the alkali metal compounds as alkali metal carbonates. According to the invention, the combustion i... | 09/20/2005 |
| 6890404 | Composition for the production of improved pulp Compositions and method for improving properties of pulp produced or reducing the digester cycle time in alkaline chemical pulping processes in which an effective amount of at least one selected phosphonate or carboxylate compound or mixtures thereof is admixed with... | 05/10/2005 |
| 6887345 | Process and device for evaporating liquids, for example black liquor from cellulose cooking, which contain solid and dissolved substances The present invention relates to a process and a device for evaporating liquids, for example black liquor from cellulose cooking, which contain solid and dissolved substances which are to be concentrated. The liquid is heated to close to boiling temperature in a hea... | 05/03/2005 |
| 6875414 | Polysulfide measurement methods using colormetric techniques Methods of converting a sulfide in a composition to polysulfide are described, one method comprising the steps of exposing the composition to conditions and for a time sufficient to cause conversion of at least a portion of the sulfide, to polysulfide to form a modi... | 04/05/2005 |
| 6869503 | Composition for inhibiting calcium salt scale Compositions and method of improving inhibition of calcium salt scale formation under the conditions found in chemical pulp processes in which an effective amount of selected phosphonates or phosphonate blends is admixed with the black liquor composition recovered f... | 03/22/2005 |
| 6821384 | Process for the treatment of fly ash, using hydrochloric acid The invention relates to a process for the treatment of fly ash accumulating in the electro-filter of the soda recovery unit in a sulfate cellulose mill, the ash containing primarily Na sulfate, Na chloride, Na carbonate and K sulfate, to produce industrial raw mate... | 11/23/2004 |
| 6797125 | Method of treating condensates The present invention relates to a method of treating condensates containing compounds, which are more volatile than water, in an evaporation plant, where liquid, such as effluent liquid from a pulp or paper mill is evaporated in multiple effects and where condensat... | 09/28/2004 |
| 6790313 | Method of cleaning sulfide contaminated condensates A method to remove sulfides and other volatile contaminants from liquor vapor condensate in a pulp manufacturing process, where the mentioned liquor vapor condensate is fed into a stripper, which is part of a closed loop system including the stripper, a regenerative... | 09/14/2004 |
| 6719879 | Method for kraft waste reclamation A method for obtaining particulate calcium carbonate having an average particle size less than about 12 microns is provided. The method includes the steps of (1) withdrawing from a pulp mill a mixture containing calcium carbonate; (2) treating the mixture to remove ... | 04/13/2004 |
| 6691358 | Oxidized white liquor in an oxygen delignification process The invention refers to a method for an integrated treatment of cellulose pulp. The method includes the steps: providing said cellulose pulp (1), providing a determined quantity of white liquor (2) including alkali and sulphur components, providing an oxy... | 02/17/2004 |
| 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 |
| 6627784 | Highly efficient method of mixing dissimilar fluids using mechanically induced cavitation A method of mixing two or more dissimilar fluids such a gas and a liquid is provided. The method includes the steps of introducing one fluid into the other to form a mixture, inducing cavitation in the mixture to reduce at least one of the fluids to a lar... | 09/30/2003 |
| 6578529 | Arrangement for feeding black liquor into a recovery boiler The present invention relates to an arrangement for introducing black liquor into a furnace of a recovery boiler, said arrangement comprising an elongated tube having an interior surface and an exterior surface, through which tube the black liquor being f... | 06/17/2003 |
| 6511578 | Bleaching and delignifying cellulosic pulp using caroate/caro's acid solution The invention relates to a method of bleaching and/or delignifying cellulose, in which (a) a sodium hydroxide solution and a peroxydisulphate solution are first of all produced by electrolysis of a sulphate, (b) the peroxydisulphate solution is converted by hy... | 01/28/2003 |
| 6503369 | Process for producing cellulose and fertilizer by-product The invention relates to a process for producing cellulose and a fertilizer by-product by using a closed cycle of cooking chemicals and process waters. In the process of the invention, the pulp is bleached by at least partly using potassium hydroxide as a... | 01/07/2003 |
| 6451164 | Alkyleneamine composition for enhancing lime mud dewatering A process for de-watering lime mud in a Krafft pulping process is described. The process includes an improvement which comprises adding an effective water-removal rate enhancing amount of an alkyleneamine to the lime mud prior to filtration. The preferred... | 09/17/2002 |
| 6425976 | Method for black liquor gasification in recovery boilers The invention refers to a method for black liquor gasification in recovery boilers, of the type having a lower portion, referred to as a lower furnace and an upper portion, referred to as an upper furnace, black liquor sprayers for introduction of black l... | 07/30/2002 |
| 6319358 | Electrolytic causticizing of smelt from a kraft recovery furnace An electrochemical process is provided for treatment of molten kraft smelt produced from black liquor in a kraft recovery boiler. Treated smelt can be contacted with water to produce white liquor which can be re-used or recycled in the kraft process.... | 11/20/2001 |
| 6312560 | Use of alkyleneamines for enhancing lime mud dewatering A process for dewatering lime mud in a kraft pulping process is described. The process includes an improvement which comprises adding an effective amount of an alkyleneamine to the lime mud prior to filtration. The preferred alkyleneamine is ethyleneamine... | 11/06/2001 |
| 6294048 | Method for regenerating sodium hydroxide by partial autocausticizing sodium carbonate containing smelt by reaction with a 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... | 09/25/2001 |
| 6261411 | Process for kraft chemical recovery A method of recovering chemicals from spent black liquor used in a kraft pulping process comprising organic materials having oxygen containing functional groups, the method comprising heating the black liquor in the presence of lime at an elevated tempera... | 07/17/2001 |
| 6228214 | Method for black liquor gasification in recovery boilers The invention refers to a method for black liquor gasification in recovery boilers, of the type having a lower portion, referred to as a lower furnace and an upper portion, referred to as an upper furnace, black liquor sprayers for introduction of black l... | 05/08/2001 |
| 6183598 | Process for recovering alkali and black liquor containing silicatae The invention relates to a process for recovering alkali and heat from a black liquor (5) containing silicate from a soda cook of e.g. grass, reed, straw and bagasse. In the process the black liquor (5) is treated with a gas (6) containing carbon dioxide ... | 02/06/2001 |
| 6168685 | Process FOR oxidation of concentrated black liquor Concentrated black liquor formed in a kraft pulp mill process is treated to effect exothermal oxidation of black liquor solids, so as to heat the concentrated black liquor and consume a proportion of the black liquor solids. Such procedure eliminates the ... | 01/02/2001 |
| 6136144 | Method of removing sulfur from a process gas stream using a packed bed calcinator The present invention reduces the sulfur and odor emissions from a paper-making Kraft process by recovering the sulfur in the non-combustible gases (NGCs) emitted by the Kraft process. In a first embodiment of the invention, the NGCs are flamelessly oxidi... | 10/24/2000 |
| 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 |
| 6123806 | Process for kraft chemical recovery A method of recovering chemicals from spent black liquor used in a kraft pulping process comprising organic materials having oxygen containing functional groups, the method comprising heating the black liquor at an elevated temperature and at a correspond... | 09/26/2000 |
