Matches 1 - 50 out of 205 1 2 3 4 5 >
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7303649 Removal of inorganic elements from wood chips  
In a process of treating wood chips for reduction of the concentration of undesirable inorganic elements prior to cooking in a production line for chemical pulp, the wood chips, having entrapped...
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....
6824646 Process for oxygen bleaching and enzyme treating lignocellulosic pulp with liquid treatment and recovery  
Lignocellulose pulp is bleached by bleaching a pulp in aqueous alkali solution with oxygen and treating the pulp with a hemicellulase, while a liquid fraction delivered from the enzyme treatment...
6746568 Treatment of filtrates from peroxide bleaching of pulp  
A method in bleaching of pulp is described, in which the pulp is subjected to a peroxide bleaching step, whereupon the pulp is washed and the washing liquid from the washing is separated from the...
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...
6562191 Process for producing pulp with a mixture of formic acid and acetic acid as cooking chemical  
A process based on formic acid cooking for producing pulp from herbaceous plants and deciduous trees by using acetic acid as an additional cooking chemical. The obtained pulp can be used in fine...
6544384 Pretreatment of chips before cooking  
The strength properties of chemical cellulose pulp (particularly kraft pulp) are improved by substituting a cold impregnation soak for conventional impregnation procedures. After steaming, wood...
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...
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...
6315861 Process for conditioning ozone gas recycle stream in ozone pulp bleaching  
A method for conditioning an ozone gas recycle stream in an ozone pulp bleaching process. The method includes the steps of providing an oxygen containing feed gas to an ozone generator; generating...
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...
6261413 Continuously guiding liquids in a digester during pulp digestion  
The present invention relates to a process for continuously guiding a liquid when digesting pulp in a digester, wherein liquid used in a process step can circulate between containers or tanks...
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...
5993601 Process for producing polysulphide by means of oxidizing sulphide in spent liquors from kraft cellulose cooking  
The invention relates to a process for producing polysulphide by means of oxidizing sulphide in spent liquors from kraft cellulose cooking. The process is characterized in that green liquor is...
5944951 Method for reusing spent gas from an ozone bleaching reactor  
A method for reusing spent gas from an ozone bleaching reactor includes steps for removing lint from the spent gas, compressing it, passing it through a reactor in which hydrocarbons and carbon...
5938892 Process for recycling bleach plant filtrate  
A process for bleaching wood pulp is provided comprising subjecting the wood pulp, after brown stock washing, to an oxygen delignification stage, a washing sequence, a first chlorine dioxide...
5853535 Process for manufacturing bleached pulp including recycling  
A process for bleaching wood pulp is provided comprising subjecting the wood pulp, after brown stock washing, to an oxygen delignification stage, a washing sequence, a first chlorine dioxide...
5788813 Clarifying and/or filtering of green liquor and an apparatus therefore  
A method and apparatus for treating green liquor from a sulphate pulp mill enhances the clarification of the green liquor and may easily be integrated into existing pulp mills. A first portion of...
5779856 Cooking cellulose material using high alkali concentrations and/or high pH near the end of the cook  
Chemical (typically kraft) pulp having enhanced intrinsic fiber strength and bleachability compared to pulp produced using conventional or modified kraft cooking is produced by using high alkali...
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...
5676795 Process for the production of viscose pulp  
The present invention relates to a process for producing viscose pulp from lignocelluloses, such as hardwood, softwood or annual plants, in which process the lignocellulose is treated in a digester...
5645728 Hydrogen peroxide recovery from colored aqueous solutions  
A method of recovering hydrogen peroxide from colored aqueous solutions is disclosed. The solution is brought in contact with a non-ionic size-exclusion chromatography resin made up of packed...
5639347 Method of controlling of metals in a bleach plant, using oxidation  
A method and apparatus facilitate removal of metals from acidic liquids containing dissolved metals (such as pulp mill bleach plant washer filtrate) by oxidizing the liquid with ozone, hydrogen...
5635026 Cooking cellulose material with high alkali concentrations and/or high pH  
Chemical (typically kraft) pulp having enhanced intrinsic fiber strength and bleachability compared to pulp produced using conventional or modified kraft cooking is produced by using high alkali...
5562830 Calcium carbonate scale controlling method  
A method of inhibiting corrosion and scale formation and deposition in aqueous systems by adding a combination of a polyepoxysuccinic acid or salts thereof and a phosphonocarboxylic acid or salts...
5509999 Treatment of bleach plant effluents  
The removal of bleaching chemical-consuming metals from treatment fluids in a cellulose pulp mill is facilitated by treating the pulp in an acidic or neutral stage to dissolve metals, washing or...
5472567 Method of chemically reacting a slurry with a gas  
A number of different, efficient treatments of slurries and liquid with gas can be provided. A slurry or liquid is introduced into a first end of a vortex. A gas--such as a chemically reactive...
5468393 Methods of controlling scale formation in the presence of metal ions in aqueous systems  
A method of inhibiting scale formation in acidic aqueous systems where metal ions such as Al +3 and Fe +3 are present by employing a polyepoxysuccinic acid in combination with a metal ion binding...
5407583 Controlling scale in black liquor evaporators  
An anionic/cationic polymer mixture comprising: (a) a polyanion selected from polyacrylic acid, polymethacrylic acid, and polymaleic anhydride, each optionally copolymerized with each other, or...
5405497 Method of chemically reacting a liquid with a gas in a vortex  
A slurry or liquid is introduced into a first end of a vortex. A gas--such as a chemically reactive gas--is introduced from exteriorly of the vortex into contact with the slurry or liquid in the...
5403441 Method for controlling an ozone bleaching process  
A method for controlling the gas recycle loop of an ozone bleaching process wherein an ozone generator produces an ozone containing gas from an oxygen containing feed gas and delivers the ozone...
5401362 Control of metals and dissolved organics in the bleach plant  
Transition metals are removed from cellulose pulp and treatment fluids in a pulp mill. Medium consistency digested pulp is treated in an acidic stage, and then washed to produce a filtrate. The pH...
5368740 Methods of controlling scale formation in the presence of metal ions in aqueous systems  
A method of inhibiting scale formation in acidic aqueous systems where metal ions such as A1 +3 or Fe +3 are present by employing a polyepoxysuccinic acid in combination with a metal ion binding...
5352332 Process for recycling bleach plant filtrate  
A process for bleaching wood pulp is provided comprising subjecting the wood pulp, after brown stock washing, to an oxygen delignification stage, a washing sequence, a first chlorine dioxide...
5328564 Modified digestion of paper pulp followed by ozone bleaching  
Kraft pulp is bleached to a brightness of about 90 CPPA or greater, without the use of chlorinated organic compounds that has commercially acceptable strength properties. During production of the...
5246542 Evaporation and recovery process for bleached chemical thermo-mechanical pulp (BCTMP) effluent  
The invention disclosed here is a process or system for treating the effluent from a BCTMP pulp mill. The effluent is evaporated to produce a water condensate and a remaining waste product...
5174860 Low temperature recovery of kraft black liquor  
A kraft black liquor recovery system utilizing three separate reactors for liquor pyrolysis, sulfate reduction and carbon plus organics combustion, respectively. Oxidized black liquor is pyrolyzed...
5127992 Elimination of bleach effluents  
A process is provided for the treatment of an acidic aqueous effluent derived from a chlorine or chlorine compound bleaching process. The acidic effluent is reacted with a neutralizing base...
5082526 Process of producing kraft pulping liquor by the oxidation of white liquor in the presence of lime mud  
Sodium sulfide or hydrosulfide is oxidized to produce sodium polysulfide and sodium hydroxide. Under appropriate conditions, the oxidation may be pursued further to convert all the sodium sulfide...
5034094 Method of converting inorganic materials from kraft pulping liquor into pulping chemicals without passing them through a recovery furnace  
A process for increasing the pulp producing capacity of a kraft mill including the steps of removing at least a portion of the lignin from kraft black liquor and separating the lignin from the...
5013454 Method of removing organic substances from effluents from pulp and paper manufacturing processes  
A method of removing dissolved and colloidal macro-molecular organic substances from effluents from processes used in the manufacture of pulp and paper, wherein an acid sludge containing cellulose...
4915830 Pulp wash press  
An elongated, imperforate housing (2) has a slurry inlet port (5) at one end and a pulp discharge port (6) at the other end. A pressing section (2b) within the housing is in direct fluid...
4853082 Process for the activation and delignification of cellulose pulp  
A process is provided for the activation and delignification of cellulose pulp, which comprises: (1) subjecting chemical cellulose pulp to activation by reaction with nitrogen dioxide in the...
4842688 Method of removing macromolecular organic dissolved and colloidal material from wood processing industry effluents  
A method of removing macromolecular organic dissolved and colloidal compounds from the effluents of a paper and cellulose mill by using waste sludge containing fibers and chemicals. The sludge is...
4812207 Method of removing lignin from bleach plant effluents  
A method of removing lignin from bleach plant effluents by using cellulose fibres. The method comprises an acidous phase during which sludge containing cellulose fibres is added to the acidous...
4725335 Process for producing nitrogen oxides from aqueous waste cellulose pulp liquor containing nitrogen compounds  
A process is provided for producing nitrogen oxides from aqueous waste cellulose pulp liquors containing nitrogen compounds including oxygen linked to nitrogen in the molecule, which includes...
4595455 Method for controlling batch alkaline pulp digestion in combination with continuous alkaline oxygen delignification  
A method for batch pulp digestion with hydroxide-bearing cooking liquors in combination with continuous alkaline oxygen delignification is described. The brown stock washing plant and the connected...
4574032 Process for delignification of lignocellulosic material in the presence of anthraquinone in solution with white and black liquors  
A method of introducing anthraquinone into the kraft pulping process for the delignification of lignocellulosic material by dissolving or homogeneously dispersing the anthraquinone in a mixture of...
4537656 Method for delignifying or bleaching cellulose pulp wherein chlorine is added to recycle liquor to regenerate chlorine dioxide  
A method for delignifying and/or bleaching cellulose pulp adds to the cellulose pulp a liquid which contains chlorine dioxide, causes the pulp to react with the chlorine dioxide over a selected...
4508593 Process for recovery of sulfur dioxide liberated in the chemical pulping of lignocellulosic material  
A process is provided for the recovery of sulfur dioxide liberated in the chemical pulping of lignocellulosic material, which comprises (1) collecting sulfur dioxide-containing gas emitted...
Matches 1 - 50 out of 205 1 2 3 4 5 >