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8172981 |
Separating lignin from black liquor by precipitation, suspension and separation
A method for controlling the sodium and sulphur balance of a pulp mill while separating lignin from black liquor, and also a lignin product or an intermediate lignin product obtainable by the...
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8038840 |
Process for refining and producing cellulose, lignin and xylose from biomass material
A process for refining and producing cellulose, lignin and xylose from biomass material comprises the following steps: pulverizing and screening the biomass material; and then dipping the biomass...
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7699958 |
Method for improving separation of carbohydrates from wood pulping and wood or biomass hydrolysis liquors
A method for separating carbohydrates from pulping liquors includes the steps of providing a wood pulping or wood or biomass hydrolysis pulping liquor having lignin therein, and mixing the liquor...
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7686964 |
Method and device for washing of lime mud
The method and an arrangement are for dewatering and washing lime slurry before the dewatered lime mud is passed to a lime mud kiln. The lime slurry is dewatered in a pressurized lime mud filter of...
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7396434 |
Catalytic reactor process for the production of commercial grade pulp, native lignin and unicellular protein
A continuous and batch system to produce cellulose, native lignin and unicellular protein from any form of vegetation in a closed process. The biomass is mixed in the impregnate solution of nitric...
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7384501 |
Method for improved turpentine recovery from modern cooking plants
A method for the preparation of pulp by means of alkaline cooking, in which method spent liquor is transferred to pressurized tanks, and at least one liquor is expanded corresponding to a...
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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...
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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...
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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....
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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...
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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,...
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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...
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6540871 |
Method for processing black liquor sediment
An apparatus and method are provided to reduce the size of solid clumps of material and thereby permit reuse of the material. In particular, the apparatus and method allow for reuse of sediment...
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6409882 |
Tall oil refining improvement
In a tall oil refining operating plant, a warm water loop is disclosed for cooling the tall oil heads fraction extracted from the crude tall oil, rather than the conventional use of cold water....
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6245196 |
Method and apparatus for pulp yield enhancement
The process of the present invention purposefully precipitates a portion of the dissolved lignin onto pulp fibers to improve pulp yield of unbleached pulp. The resulting retention of lignin on the...
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6183597 |
Method of producing a pulp from cellulosic material using formic acid and hydrogen peroxide
A process for producing a pulp from cellulose-containing material, wherein the material is reacted with formic acid as the solvent, and cooked at approximately the boiling temperature of the...
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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...
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6165316 |
Method and plant for separating soap from black liquor using a pressure screen
An alkaline cellulose pulp pulping process treats soap and fiber-containing liquids to separate fibers from the liquids prior to further treatment of the liquids (e.g. by evaporation and...
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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...
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6110323 |
Methods of refining agricultural residues to absorbent cellulose, xylose, and plant nutrient liquor, and products produced by such methods
A method of creating a number of separate product streams from an agricultural waste material, comprising: providing a starting material consisting of an agricultural waste material; hydrolyzing...
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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...
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5989387 |
Method for controlling chloride concentration in the flue gas of a recovery boiler
A method for adjusting the chlorine equilibrium in a sulphate cellulose process, wherein part of the chlorine contained in the cycle is separated and removed. In the method, strong odour gases from...
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5788812 |
Method of recovering furfural from organic pulping liquor
This invention provides for the recovery of lignin and other by-products from the pulping of fibrous plant material. In accordance with this invention, solvents and filtrates are recovered and...
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5730837 |
Method of separating lignocellulosic material into lignin, cellulose and dissolved sugars
A method for separating lignocellulosic material into (a) lignin, (b) cellulose, and (c) hemicellulose and dissolved sugars. Wood or herbaceous biomass is digested at elevated temperature in a...
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5730838 |
Process for extracting pure, coarse grain silicic acid crystals from spent lye
A process is disclosed for extracting pure, coarse-grain silicic acid crystals from silicic acid-containing spent lye in cellulose production, comprising adding coarse-grain silicic acid to...
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5707490 |
Method of recovering energy from waste liquors from pulp processes
A method of recovering energy from waste liquors from cellulose pulp processes produces high quality superheated steam, a savings in material costs is achieved, and the utilization factor of the...
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5662774 |
Adjusting the sulphur balance of a sulphate cellulose plant by heat treating black liquor in a last evaporation stage
The invention relates to a method of adjusting the sulphur balance of a sulphate cellulose plant, in which method black liquor is concentrated and heat treated by keeping it at a temperature higher...
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5660685 |
Gasifying black liquor with recycling of generated hydrogen sulphide gas to the gasifier
A method of preparing a digesting liquor having high sulphidity from a spent liquor obtained from digesting cellulosic fiber material, optionally without a conventional causticizing step is...
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5637225 |
Method for fractionating sulphite cooking liquor
The invention relates to a method for the fractionation of sulphite cooking liquor by a chromatographic simulated moving bed system in which the liquid flow is effected in a system comprising at...
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5635024 |
Process for separating lignins and dissolved organic compounds from kraft spent liquor
Digestion liquor is used in the paper pulping process to dissolve lignins and free the cellulose fiber from raw wood chips. After pulping, spent digestion liquor is laden with lignins. Heretofore,...
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5628872 |
Method for bleaching pulp with hydrogen peroxide recovered from cellulosic spent liquor
The process for producing hydrogen peroxide, used in the bleaching of pulp, uses the hydrogen generated wholly or partly by the gasification or partial combustion of cellulose spent liquors used in...
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5589030 |
Method for preparing vanillin from old newsprint
This invention relates generally to a method for extracting lignosulfonate for the manufacture of vanillin and other specialty chemicals. Specifically, the invention relates to a method for...
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5562804 |
Method for adjusting the sulphur/sodium ratio in the flue gases of a soda recovery boiler
A method for adjusting the sulphur/sodium ratio in a soda recovery boiler when strong sulphurous odour gases are burned therein. According to the method, sodium is introduced into the soda recovery...
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5518582 |
Method of affecting the sulphur content and/or sulphur compound composition of a melt in a recovery boiler
The sulphur content and/or the sulphur compound composition of a melt in a recovery boiler of a pulp mill is adjusted by bringing a gas into contact with the melt. The gas may be a gaseous sulphur...
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5489363 |
Pulping with low dissolved solids for improved pulp strength
Kraft pulp of increased strength (e.g. at least about 15% greater tear strength at a specified tensile for fully refined pulp, and as much as about 27%) is produced by keeping the dissolved organic...
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5480512 |
Method of controlling sulfidity of a sulfate pulp mill
To decrease the sulfur emissions of a sulfate pulp mill, and achieve other advantages, black liquor is heated at a temperature higher than the cooking temperature of the sulfate cook (e.g. between...
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5450892 |
Alkaline scrubber for condensate stripper off-gases
This invention relates to an alkaline scrubber for condensate stripper off-gases. In particular, this invention relates a process for selectively removing hydrogen sulfide and methyl mercaptan from...
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5374333 |
Method for minimizing pulp mill effluents
Apparatus for a pulp and paper mill, and methods of acting on liquid effluents produced in the mill, which minimizes the discharge of polluting gaseous and liquid effluents to the environment....
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5326433 |
Multi-level sulfide content white liquor production and utilization in cellulose pulping
Paper pulp (e.g. kraft pulp) is produced utilizing at least two different supplies of cooking liquor, one having low sulfide content, and the other high sulfide content. The high sulfide content...
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5277759 |
Method of controlling sulfidity of a sulfate cellulose mill
To decrease the sulfur emissions of a sulfate cellulose mill, black liquor is heated before the last effect of the evaporation at a temperature higher than the cooking temperature of the sulfate...
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5198074 |
Process to produce a high quality paper product and an ethanol product from bamboo
A method of producing high quantities of ethanol and a high quality pulp to produce a variety of papers. The method comprises preparing the bamboo by chipping, shredding and washing. This bamboo...
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5100511 |
Method for the manufacture of products containing fibers of lignocellulosic material
A method for the manufacture of products containing fibers of lignocellulosic material which involves the disintegration of a lignocellulosic material into fibers and forming and pressing of the...
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5096540 |
Method for recycling sulfur dioxide from sulfite pulping liquors
Combined acidification and evaporative concentration of sulfite based chemical and sulfite based semichemical spent liquors expel massive amounts of gaseous sulfur dioxide and water vapor from the...
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5061343 |
Recovery of NaOH and other values from spent liquors and bleach plant effluents
Oxidized weak black liquor or effluents from alkaline bleaching stages, particularly oxygen delignification and/or ozone and/or hydrogen peroxide bleaching effluents are treated in process stages...
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5049236 |
Lignin derived quinonic compound mixtures useful for the delignification of cellulosic materials
A method for the preparation of a mixture of fused ring quinone type compounds from lignin and lignin-derived substances. The mixture of fused ring quinone compounds has been found useful in the...
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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...
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4988799 |
Lignosulfonate based pharmacologic agent with anti-coagulant and anti-thrombotic activity
A lignosulfonate useful pharmacologically as an anti-thrombotic that inhibits deep venous thrombophlebitis without effecting blood coagulation, and which causes no apparent increased bleeding or...
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4971657 |
Combined process for thermally and chemically treating lignocellulose-containing biomass and for producing furfural and cellulose-containing fiber masses
A process for the thermal and chemical treatment of lignocellulose-containing biomass and for the production of furfural and cellulose-containing fiber masses. In order to ensure a high yield of...
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4966650 |
Method for fractionation of lignins from steam exploded lignocellulosics to provide fractions with different properties
The chemical components of lignocellulosic material which have been dissociated by a steam explosion process can be extracted from the mixture of components using a solvent extraction process. The...
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4964995 |
Supercritical separation process for complex organic mixtures
A process is disclosed for separating low molecular weight components from complex aqueous organic mixtures. The process includes preparing a separation solution of supercritical carbon dioxide...
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