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| Number | Title | Issue Date |
| 7540938 | Method and system for energy savings in TMP by high temperature LC/MC refining of pulp A method for recovering heat from a pulp refining process comprising: discharging pressurized pulp from a high pressure refiner, wherein the pressurized pulp comprises a pressurized slurry of fibers and liquid; introducing at least the liquid from the pressurized pu... | 06/02/2009 |
| 7311877 | Inhibition of corrosion in fluid systems The present invention provides an effective method of inhibiting corrosion on metallic surfaces in contact with a fluid contained in an industrial system, which includes adding to such fluid an effective corrosion controlling amount of a phosphoglyceride compound, o... | 12/25/2007 |
| 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 |
| 7229526 | Method and apparatus for the feeding of fibers A system for feeding fibres from a fibre separation step at a first pressure to a drying step at a second, lower pressure, the system comprising a sluice feeder (3) provided between the fibre separation step and the drying step. At least an outlet (14)... | 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 |
| 7112256 | Method for continuous cooking of chemical pulp to improve heat economy A method for the continuous cooking of chemical pulp with the aim of achieving improved heat economy in a digester system having a vessel (1) for impregnation and a vessel (2) for cooking the impregnated cellulose chips. A part of the black liquor (... | 09/26/2006 |
| 7005034 | Method in connection with the production of mechanical pulp A method in connection with the production of mechanical pulp from a cellulose containing material wherein the material is processed in at least one refining step to produce pulp. According to the invention, the pulp is fractionated (4), after a first refinin... | 02/28/2006 |
| 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 |
| 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 |
| 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 |
| 6761799 | Method and arrangement for combusting black liquor The present invention relates to a method and an arrangement for use in connection with the combustion of black liquor. In the method the black liquor is concentrated in a multi-effect evaporation plant in order to obtain black liquor at a suitable dry-solids conten... | 07/13/2004 |
| 6596908 | Process for the recovery of low molecular weight phenols, furfural, furfuryl alcohol and/or cellulose or cellulose-rich residues A process for the recovery of furfural, furfuryl alcohol, low molecular weight phenols and/or cellulose or a cellulose-rich material from a lignocellulosic material comprising: feeding a carrier gas into a reaction chamber to facilitate a fluidised bed ef... | 07/22/2003 |
| 6524436 | Flash tank steam economy improvement By the utilization of a jet ejector (such as a thermocompresser) in a cellulose chemical pulp mill, it is possible to effectively increase the utilization of steam. The volume of steam from a flash tank which flashes black liquor from a pulp digester may ... | 02/25/2003 |
| 6464826 | Method for producing and treating wood fiber Method is disclosed for treating wood chips including a heater for preheating the wood chips in the presence of steam, a beater to mechanically process the wood chips into wood fibers, a cyclone for separating the wood fibers from steam and volatile organ... | 10/15/2002 |
| 6419788 | Method of treating lignocellulosic biomass to produce cellulose A multi-function process is described for the separation of cellulose fibers from the other constituents of lignocellulosic biomass such as found in trees, grasses, agricultural waste, and waste paper with application in the preparation of feedstocks for ... | 07/16/2002 |
| 6383342 | Cluster rule compliance with reduced steam consumption A method and system for handling foul condensate containing Hazardous Air Pollutants (HAPs) in a cellulose pulp mill has enhanced energy efficiency and lower cooling water usage, while complying with the Cluster Rules and other environmental regulations. ... | 05/07/2002 |
| 6375795 | Minimization of malodorous gas release from a cellulose pulp mill feed system The release of malodorous TRS-containing gases from a comminuted cellulosic fibrous material feed system for a digester is minimized utilizing a particular arrangement associated with a pressure isolation device. Material is fed through the pressure isola... | 04/23/2002 |
| 6350348 | Batch cooking with black liquor pretreatment A method of cooking pulp in an alkaline batch process (using one or more batch digesters) improves pulp bleachability. The wood material is supplied to the digester; the cellulosic material is pre-treated in the digester with a first liquor, the first liq... | 02/26/2002 |
| 6332950 | Method in connection with the pretreatment of comminuted fibrous material A method in connection with the pretreatment of comminuted fibrous material intended for chemical cellulose pulp production. The fibrous material is fed through a low pressure system that has a gas phase part followed by a liquid phase part. The liquid ph... | 12/25/2001 |
| 6306252 | Heat recovery from spent digester cooking liquor Steam (preferably clean steam) having less noncondensible gases than steam produced by conventional black liquor flashing is produced from hot black liquor from a digester of a pulp mill. A heat exchanger is utilized and the hot black liquor is passed thr... | 10/23/2001 |
| 6284095 | Minimization of malodorous gas release from a cellulose pulp mill feed system The release of malodorous TRS-containing gases from a comminuted cellulosic fibrous material feed system for a digester is minimized utilizing a particular arrangement associated with a pressure isolation device. Material is fed through the pressure isola... | 09/04/2001 |
| 6258206 | Process for purifying condensate while evaporating waste liquors A process for evaporating spent liquor or other waste liquids from cellulose cooking, The evaporation is performed in a multiplicity of evaporators which are coupled in series and in which the evaporation is driven using the liquor steam. The condensates ... | 07/10/2001 |
| 6221207 | Oxygen delignification of pulp in two stages with low pressure steam heating between stages Methods for oxygen delignification of chemical pulps are disclosed including contacting the chemical pulp with oxygen first in an upstream reactor vessel and then in a downstream reactor vessel. The upstream reactor vessel is maintained at pressures of gr... | 04/24/2001 |
| 6217711 | Method of treating condensates A method of treating cellulose pulp mill condensates having an MeOH content using an evaporator and a steam stripper having a reboiler, comprising: (a) Collecting a feed liquor stream having at least 50% of the pulp mill MeOH. (b) Feeding the feed liquor ... | 04/17/2001 |
| 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 |
| 6176971 | Heat economy enhancements for the recovery and use of energy obtained from spent cooking liquors Useable steam, e.g. substantially clean useable steam, is produced from a chemical cellulose pulping system hot spent treatment liquor (e.g. black liquor) with optimum energy efficiency by passing the spent liquor to a reboiler, and then pressurizing (e.g... | 01/23/2001 |
| 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 |
| 6136145 | Method for treating pulp in an indirect heat exchanger in connection with bleaching A method of treating pulp and an apparatus for practicing the method are particularly suitable for the bleaching of medium consistency pulp when bleaching stages of varying temperature are used. Chemical pulp is treated in such a way that the pulp is allo... | 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 |
| 6113739 | Process for washing gas formed by gasifying black liquor Process for recovering chemicals and energy from black liquor, where the black liquor is gasified with CO, CO2, CH4, H2, and H2 S, in gaseous form, and Na2 CO3, NaOH and Na2 S, in the... | 09/05/2000 |
| 6071380 | Method of papermaking having zero liquid discharge A method of papermaking having zero liquid discharge. A pulp slurry is produced from recycled cellulosic material and the slurry contains suspended cellulosic fiber material, solid contaminants and dissolved water soluble solids. The pulp slurry is subjec... | 06/06/2000 |
| 6047649 | Method and arrangement in cooling medium circulation of a recovery boiler The object of the present invention is a method in cooling medium circulation, whereby the recovery boiler comprises a furnace limited by wall tubes provided with cooling medium circulation and substantially horizontal floor tubes; a supply system for com... | 04/11/2000 |
| 5962676 | Processes for the modification and utilization of bacterial cellulose Treatment of gelatinous bacterial cellulose by breaking up gelatinous cellulose into a micro-fiber form and then evaporating water from the result with application of heat. The evaporation can be achieved by heating to a temperature above 100 degrees Cent... | 10/05/1999 |
| 5961784 | Method for reducing the consumption of fresh water in a paper mill by means of a cooling tower A method for reducing the consumption of fresh water and energy in a paper mill in which fresh water is passed into the paper mill for various needs, and a cooling tower is utilized for cooling water heated in the papermaking process. All fresh waters or ... | 10/05/1999 |
| 5961781 | Process for recovering heat energy by condensation of vapor and dilution of sodium hydroxide using a condensing heat exchanger scrubbing system A process of improving the heat efficiency by condensation of vapor in concentrated chemical solutions, according to which vapor and a concentrated chemical solution are introduced into an absorber comprising a cooler/condenser. In accordance with the inv... | 10/05/1999 |
| 5958183 | River water heat exchanger for cooling process liquid in a paper-making machine A heat exchanger cools a process liquid in a paper-making machine using a source of cooling water. A first tank includes a plurality of first walls. A first inlet is connected to at least one of the first walls and the source and receives the cooling wate... | 09/28/1999 |
| 5944950 | Process for the final evaporation of black liquor The process for the final evaporation has at least two evaporation appliances. These appliances are coupled in series with respect to the black liquor and in parallel with the live steam (primary steam), which drives the evaporation, and with the secondar... | 08/31/1999 |
| 5882477 | Continuous digester with a low temperature gas-phase A cellulose pulp continuous digester (e.g. for producing kraft pulp) is operated so that it has the advantages of a hydraulic digester yet has a gas-filled zone over the liquid level. A slurry of chips and cooking liquor is introduced into the top of the ... | 03/16/1999 |
| 5855737 | Process for regenerating a liquid created in the kraft process for pulping wood, while simultaneously obtaining high energy efficiency An apparatus and process for regenerating a liquid from a spent liquid containing sodium compounds created during kraft processing for pulping wood while simultaneously obtaining energy. Regeneration begins by gasifying said sodium compounds in a gasifica... | 01/05/1999 |
