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| Number | Title | Issue Date |
| 7604711 | Method to optimize temperature profiles displacement batch cooking Method and apparatus for batch displacement digester systems to increase tank farm vessel temperatures for more efficient delignification rates by mitigating the formation of flow channels in the chip bed, minimizing the vertical temperature gradient in the digester... | 10/20/2009 |
| 7282115 | 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 to improve the overall efficiency of the process. ... | 10/16/2007 |
| 7241363 | Methods to decrease scaling in digester systems One aspect of this invention relates to a method and digester for reducing the deposition of calcium-based scale in a wood chip digester including extraction from the digester of first and second quantities of cooking liquor having respective first and second calciu... | 07/10/2007 |
| 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 |
| 7182835 | Two-stage chlorine bleaching process with filtrate recirculation Methods for bleaching chemical pulp are disclosed including dewatering the pulp to a concentration of from 25 to 40%, bleaching in a first chlorine dioxide stage, followed by a second alkaline bleaching stage, followed by a third chlorine dioxide bleaching stage, de... | 02/27/2007 |
| 7156952 | Method and arrangement for oxygen delignification of cellulose pulp The invention relates to a method and arrangement for alkaline oxygen delignification of cellulose pulp. By adding alkali in the final phase of the oxygen delignification one can ensure that an optimal predetermined end-pH is obtained. This provides advantages in th... | 01/02/2007 |
| 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 |
| 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 |
| 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 |
| 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 |
| 6699357 | Process for continuous cooking of pulp The invention relates to a process for continuous cooking of wood chips at elevated pressure and temperature in a vertical digester (1) for production of chemically dissolved pulp. Fiber material and cooking liquor are introduced at the top of the digeste... | 03/02/2004 |
| 6605180 | Process for continuous cooking of pulp Fiber material and cooking liquor are introduced at the top of the digester and pulp is discharged from the bottom of the digester, via a line in which the pulp is maintained at substantially the same pressure level, to a pressurized wash. More than 50% o... | 08/12/2003 |
| 6468390 | Method for continuous cooking of lignocellulosic fiber material A method for continuous cooking of lignocellulosic fiber material, comprising the steps of sequentially (a) in a first stage, impregnating the fiber material in an impregnation liquid comprising alkali metal hydroxide, and thereafter withdrawing (14, 514)... | 10/22/2002 |
| 6458242 | Ozone bleaching process using oxalic acid addition Processes are disclosed for bleaching pulp with ozone in an environmentally friendly bleaching plant. The processes include removing a first filtrate from the pulp, bleaching the treated pulp with ozone, washing the bleached pulp with a washing liquid to ... | 10/01/2002 |
| 6315863 | Chlorine dioxide pulp bleaching process having reduced barium scaling by recycling post-chlorination waste filtrate Collection of a post-chlorination washer filtrate and recycle thereof to acidify a wood pulp stream entering the initial chlorine dioxide bleaching stage is provided in order to reduce the formation of barium scale.... | 11/13/2001 |
| 6315862 | Process for bleaching pulp with adsorption of metals A process for bleaching pulp, in which, after fiber liberation, a first filtrate containing metals, principally in ionic form, is separated off from the pulp, and supplied downstream to the pulp flow after a bleaching stage.... | 11/13/2001 |
| 6210527 | Pulp bleaching method wherein an ozone bleaching waste stream is scrubbed to form an oxygen containing stream A method for producing bleached wood pulp in which wood chips are digested in polysulfide liquor to produce brown stock pulp. The brown stock pulp is washed to produce washed brown stock wood pulp and weak black liquor and the washed wood pulp is then del... | 04/03/2001 |
| 6103058 | Method for the continuous cooking of pulp This invention relates to a new and improved way of continuously cooking fiber material in an over loaded digester, wherein temperatures and alkaline levels are controlled to be maintained within specific levels in different zones of the digesting process... | 08/15/2000 |
| 5980689 | Method of separating metal ions from pulp using a chelating agent Methods for separating metal ions from pulp material are disclosed including treating the pulp with a chelating agent to produce a pulp flow with dissolved metal ions, washing that pulp flow prior to bleaching with hydrogen peroxide or ozone and mixing th... | 11/09/1999 |
| 5688367 | Method of monitoring and recovering oxygen-rich gas from ozone bleaching A method and installation for bleaching a lignocellulosic pulp with ozone, while recovering an oxygen-rich gas which may be recycled or re-used. Bleaching of the pulp with ozone is preferably carried out under conditions in which ingress of air is prevent... | 11/18/1997 |
| 5643410 | Batch process for preparing kraft pulp in a batch digesting process Methods for discharging spent cooking liquors from a batch digester containing cooked lignocellulose-containing material in spent cooking liquor are disclosed, including supplying a first portion of washing liquid to the digester to displace a first porti... | 07/01/1997 |
| 5587049 | Process for delignifying raw cellulosic material impregnated with monopersulphuric acid A process for delignifying raw cellulose which comprises a preliminary treatment for impregnating raw cellulose with a monopersulphuric acid solution, a successive filtration without washing with recycle of the filtered liquid to the first step, and a tre... | 12/24/1996 |
| 5525195 | Process for high consistency delignification using a low consistency alkali pretreatment Unbleached pulp is washed with an aqueous alkaline solution in a wash press to substantially uniformly distribute a first amount of alkaline material throughout the pulp. The consistency of the pulp exiting the wash press is above about 18%, preferably be... | 06/11/1996 |
| 5462641 | Process for bleaching pulp with adsorption of metals A process for bleaching pulp, in which, after fiber liberation, a first filtrate containing metals, principally in ionic form, is separated off from the pulp, and supplied downstream to the pulp flow after a bleaching stage.... | 10/31/1995 |
| 5460696 | Oxygen delignification method incorporating wood pulp mixing apparatus An oxygen delignification method and apparatus in which a charge of heated wood pulp is reacted with oxygen in the presence of a charge of caustic soda in a plurality of reaction stages located between mixing stages in which caustic is mixed with the wood... | 10/24/1995 |
| 5415734 | Process for bleaching pulp without using chlorine containing chemicals A process is disclosed for bleaching pulp without chlorine containing chemicals and for greatly reducing total washing filtrate discharge, comprising the steps of: 1) sending pulp that has been subjected to continuous digestion, oxygen-delignification and... | 05/16/1995 |
| 5409570 | Process for ozone bleaching of oxygen delignified pulp while conveying the pulp through a reaction zone A process for delignifying and bleaching a lignocellulosic pulp without the use of elemental chlorine or chlorine-containing compounds by oxygen delignifying the pulp to a K No. of about 14 or less and a viscosity of greater than about 10 cps and thereaft... | 04/25/1995 |
| 5296097 | Method for reducing contaminants in pulp prior to ozone bleaching A process for conditioning an ozone gas recycle stream in an ozone pulp bleaching process, wherein the level of carbon dioxide in the recycle stream is controlled to allow full capacity operation of the ozone generator. Carbon dioxide concentration is ide... | 03/22/1994 |
| 5277760 | Process for the manufacture of pulp for paper, and fiberboard products using alkaline cooking chemical and oxygen in a closed, continuous and pressurized tube system Process for producing pulp suitable as raw material for paper, board or fiberboards and similar products. A pumpable alkaline slurry of fibrous raw material is conducted through a pressurized tube system by the use of pulp pumps, the pressure increasing i... | 01/11/1994 |
| 5236553 | Continuous cooking with reduced horsepower and pulp degradation In the continuous cooking of comminuted cellulosic fibrous material (e.g. wood chips) to produce paper pulp, the material passes upwardly in an impregnation vessel which is within and concentric with a continuous digester and open at the top to digester p... | 08/17/1993 |
| 5217574 | Process for oxygen delignifying high consistency pulp by removing and recycling pressate from alkaline pulp Unbleached pulp is combined with an aqueous alkaline solution while in a state of low consistency to distribute a first amount of alkaline material substantially uniformly throughout the pulp. The consistency of the pulp is then increased to above about 1... | 06/08/1993 |
| 5211811 | Process for high consistency oxygen delignification of alkaline treated pulp followed by ozone delignification A process for delignifying and bleaching a lignocellulosic pulp without the use of elemental chlorine by partially delignifying the pulp to a K No. of about 10 or less and a viscosity of greater than about 13 cps; and further delignifying the partially de... | 05/18/1993 |
| 5188708 | Process for high consistency oxygen delignification followed by ozone relignification A process for delignifying and bleaching a lignocellulosic pulp without the use of elemental chlorine by partially delignifying the pulp to a K No. of about 10 or less and a viscosity of greater than about 13 cps; and further delignifying the partially de... | 02/23/1993 |
| 5183535 | Process for preparing kraft pulp using black liquor pretreatment reaction Processes for prepariing kraft pulp are disclosed. The processes include pretreating cellulosic material or chips with spent cooking liquor at the temperature of about 20° to 100° C., followed by heating the impregnated chips at the temperature of from ... | 02/02/1993 |
| 5173153 | Process for enhanced oxygen delignification using high consistency and a split alkali addition Unbleached pulp is combined with an aqueous alkaline solution while in a state of low consistency to distribute a first amount of alkaline material substantially uniformly throughout the pulp. The consistency of the pulp is then increased to above about 2... | 12/22/1992 |
| 5145557 | Chlorine-free bleaching method for dissolving-grade pulps using an OP-Z-P sequence A three-stage bleaching process for dissolving grade pulp utilizes the sequence OP(alkaline)-Z-P and the off gas from the Z-stage is delivered to the alkaline (OP)-stage whose parameters are controlled to fully react all of the oxygen of the off gas. The ... | 09/08/1992 |
| 5143580 | Process for reducing the amount of halogenated organic compounds in spent liquor from a peroxide-halogen bleaching sequence A process for delignification and bleaching of chemically digested lignocellulose-containing pulp for reduced formation and discharge of halogenated organic compounds, while preserving the pulp quality, where the prebleaching with halogen-containing bleac... | 09/01/1992 |
| 5118389 | Two-stage peroxide bleaching process using different amounts of peroxide on different portions of mechanical pulp A continuous two-stage peroxide bleaching process operated in a single bleach plant for producing a bleached pulp of high brightness, having a second stage bleaching step using a high charge of peroxide followed by a washing stage to recover the residual ... | 06/02/1992 |
| 5089086 | Process for continuous cooking of cellulose The invention relates to a process for continuous cooking of cellulose. In the process, wood chips (11) are impregnated (1) with cooking lye (10), after which the wood chips impregnated with cooking lye is mixed (27) with spent liquor (18) in order to tra... | 02/18/1992 |
| 5085734 | Methods of high consistency oxygen delignification using a low consistency alkali pretreatment A method for the production of delignified wood pulp is provided which result in said pulp's having improved delignification ratios. In accordance with preferred embodiments, brownstocks are substantially uniformly treated with aqueous alkaline solution w... | 02/04/1992 |
