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WO/2000/011263A1 |
The present invention relates to a method of preventing scale formation in a pulping process of chemical pulp. The method comprises at least the following steps: a) comminuted cellulosic fibrous material is treated with cooking liquor at...
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WO1999055627A9 |
Stable oxidizing biocide formulations containing bromine are provided for biofouling control in industrial water systems. The formulations contain at least one stable oxidizing bromine compound that is prepared from at least one oxidizin...
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WO/2000/003083A1 |
The invention relates to a process for enhancing the concentration of the fibre derived dissolved and colloidal substances in process water that comes from mechanical pulping. According to the invention, process water is treated with enz...
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WO/2000/001879A1 |
This invention relates to a method for cleaning unclean condensate, emanated when producing cellulose pulp including evaporation of spent liquor under utilization of a cleaning plant having several condensers, coupled in series, characte...
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WO/1999/066119A1 |
Composite panels and pulp, and paper products of the pulp, are produced from Arundo donax. In the fabrication of the composite panels, Arundo donax is comminuted (20) to a suitable size, combined with a binder (40, 50), and consolidated ...
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WO/1999/063152A1 |
Method and improving causticizing efficiency in the conventional lime recausticization portion of alkaline pulping processes, such as are commonly used in the pulping and bleaching of wood and non-wood cellulose fiber materials. An aqueo...
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WO/1999/062818A1 |
A method for producing a polysulfide which comprises introducing a solution containing a polysulfide ion to an anode chamber of an electrolysis vessel having an anode chamber equipped with a porous anode having a physically continuous, t...
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WO/1999/063151A1 |
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 i...
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WO/1999/057365A1 |
A scrubbing process and apparatus for a pulp mill in which total reduced sulphur (TRS) compounds are scrubbed from non-condensible effluent gases (NCG). A scrubbing tower is fed by the NCG and by suitable alkaline liquid for chemical int...
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WO/1999/053133A1 |
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 pulp in the form of a filtrate. The metho...
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WO/1999/049129A1 |
A method for the extraction, from a highly tannic woody material, of a tannic substance contained therein, and/or for the production of a usable lignocellulose product in particle form, comprises the following successive steps: a first f...
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WO/1999/047745A1 |
A method for reducing detrimental nitrogen compounds of a pulp mill. In the method, the ammonia contained in weak odor gases is combusted into nitrogen oxide by supplying the weak odor gases to the combustion zone for strong odor gases i...
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WO/1999/047746A1 |
A method of reducing NO¿X? compounds in the odour gases of a recovery boiler. In the method, ammonia in the odour gases is separated before they are combusted, the ammonia being then introduced into a boiler at the pulp mill or into a s...
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WO/1999/046443A1 |
A method of papermaking having zero liquid discharge. A pulp slurry (1) is produced from recycled cellulosic material and the slurry contains suspended cellulosic fiber material, solid contaminants and dissolved water soluble solids. The...
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WO/1999/045192A1 |
The present invention relates to a method for treating process water containing metal ions, in connection with bleaching of lignocellulosic pulp. According to the invention, the method is characterised by the steps of a) adjusting the Mg...
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WO/1999/042526A1 |
A lignin based colloidal dispersion into lubricating oil or bitumen is prepared from black liquor residue. In one process, in the first step, the black liquor is converted from its aqueous colloidal system to an anhydrous colloidal dispe...
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WO/1999/040034A1 |
A method and apparatus for the treatment of the 5th Effect combined evaporator condensate generated by kraft process pulp mills. The method includes the removal from effluents of organic compounds that result in BOD, COD and toxicity by ...
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WO1999019561B1 |
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 intro...
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WO/1999/037853A1 |
The present invention solves the problem concerning the emission of considerable quantities of nitrogen oxides in the combustion of gases generated from stripper gases and/or generated methanol, and relates to a method of processing cond...
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WO/1999/027180A1 |
Method and device for removal of soda melt from a soda recovery boiler in conjunction with shutdown of the soda recovery boiler, in which method the supply of lye into the boiler is interrupted and, if necessary, the pile of congealed so...
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WO/1999/027179A1 |
The present invention relates to a method for bleaching cellulose in a closed system in one or more stages using Caro's acid. The method is characterized in that to maintain the sulphur and sodium balance, the production of Caro's acid, ...
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WO/1999/023481A1 |
The invention relates to a method for measuring the properties of a stack (15) that viscous molten salt forms on the bottom of a soda recovery unit (14) while black liquor is burned therein, and for measuring the corrosion of the materia...
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WO/1999/020827A1 |
The invention relates to a process system and a method for preliminary treatment of disintegrated cellulose-containing material, preferably wood chips, prior to pulp digestion. The process system and the method according to the invention...
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WO/1999/019668A1 |
A method and an arrangement for reducing emissions of nitrogen oxides in a combustion apparatus provided with a tubular furnace. The method comprises burning odour gases at first sub-stoichiometrically, and subsequently supplying additio...
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WO/1999/016539A1 |
A continuous dynamic mixing assembly (61) includes a mixing chamber (16) having an inner wall which is generally symmetrical about a central axis. At least one first fluid inlet (18) introduces first fluid material into the mixing chambe...
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WO/1999/014423A1 |
The invention relates to a process for producing pulp from cellulosic fiber material with improved polysulfide regeneration alone or in combination with polysulfide cooking. The cellulosic fiber material is impregnated with polysulfide b...
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WO/1999/010595A1 |
The invention relates to a method for removing chemically bound formic acid from a material containing the same, in the presence of free formic acid. The method is characterized in that chemically bound formic acid is allowed to react to...
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WO/1999/004088A1 |
This invention relates to a method of oxidizing white liquor. The method involves introducing a solution containing white liquor (14) into a high intensity liquid/gas reactor (23); exposing the solution to an oxygen-containing gas (22); ...
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WO/1999/002771A1 |
When pulp is manufactured by so-called modified cooking methods, spent liquor is formed containing large amounts of calcium bound to the dissolved material. During evaporation calcium is liberated and precipitates on the heat transfer su...
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WO/1999/001612A1 |
The invention relates to a method for minimizing water use in a water circuit in a paper, cellulose or wood factory by adjusting the concentration of interfering substances. The inventive method is chiefly characterized in that the conce...
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WO/1998/055685A1 |
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...
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WO/1998/054400A1 |
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 ...
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WO/1998/051855A1 |
Scaling problems in, for instance, washing apparatus occur when using fully closed liquid flow patterns in the manufacture of bleached cellulose pulp. The present invention provides a solution to this problem, and relates to a method for...
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WO/1998/048102A1 |
A process for separating alkali compounds entrained in a superheated gas which has been formed from partial combustion of spent liquor from a cellulose pulping process, where at least cooling medium is injected into a gas/salt smelt mixt...
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WO/1998/045306A1 |
The separation of black liquor, containing lignin, from tall oil is enhanced by the addition of a separation aid. The separation aid is an alkylphenol-Formaldehyde resin ethoxylate, an ethanol amine condensate, or combination thereof.
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WO/1998/043017A1 |
A recovery boiler is provided that may be made larger than conventional soda recovery boilers which burn black liquor to produce energy and to recover chemicals for the kraft pulping process, by providing a particular substantially recta...
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WO/1998/042912A1 |
The invention relates to a method which enables the reliable and pure separation of aromatic polymers that are precipitable by acidification, as found in particular in waste water from cellulose production, from an alkaline solution. In ...
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WO/1998/039258A1 |
The process according to the present invention relates to the treatment of wastewater discharged from a bleach plant and more particularly treatment of bleach plant alkaline wash filtrate from treatment-steps and/or delignification/bleac...
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WO/1998/032915A1 |
A process using an amphoteric ion-exchange resin, also known as a 'snake-cage polyelectrolyte' resin, contained in an ion retardation unit (9) separates kraft white liquor (8) into sulphide-rich (12) and caustic-rich (10) components. The...
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WO/1998/029598A1 |
A method for the treatment of cellulose fibres in a pulp stream (22) comprises the following steps. A pulp is prepared (21). The pulp is subjected to a bleaching, comprising at least a bleaching step (25, 30) by the addition of an oxidiz...
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WO/1998/027384A1 |
The invention relates to a method for converting the capacity of a boiler, particularly a soda recovery boiler. When operating in the first efficiency range, the boiler is used in a way that the open space (10) is kept in radiation commu...
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WO/1998/025853A1 |
A process for preparing calcium carbonate wherein the causticizing step is utilized to prepare inexpensive spindle- or rice-grain-shaped calcium carbonate which can impart as a papermaking filler the properties useful for paper, such as ...
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WO/1998/025852A1 |
A process for preparing calcium carbonate wherein the causticizing step is utilized to prepare inexpensive spindle-shaped or acicular calcium carbonate which can impart as a papermaking filler the properties useful for paper, such as bul...
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WO/1998/023360A1 |
A method wherein a methanol-containing waste gas stream, such as a pulp mill waste stream which contains methanol and other waste products, including methyl mercaptans, is passed in contact with a catalyst comprising certain supported me...
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WO/1998/021401A1 |
A segmented smelt spout (12, 12') comprising an assembly of different casting shapes wherein one shape constitutes the base segment (30), which is installable in a chemical recovery unit (10), and the other shapes are a combination of st...
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WO/1998/019003A1 |
The present invention relates to purifying ash from a recovery boiler by leaching or evaporation-crystallizing contaminants such as, mainly, chlorides and potassium salts in water. The process is characterized in that the leaching or the...
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WO/1998/017857A1 |
A procedure in the manufacture of lignocellulose to remove non-process elements in the form of incrust forming alkaline earth metals and other metals and transition metals is described, the extraction with a combination of an organophili...
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WO/1998/016685A1 |
The invention comprises a falling-film evaporator for evaporating wast liquor from pulp cooking, comprising a tube system (4, 5) with horizontal tubes (4). The invention is characterized in that the tubes (4) are, at each tube end, mount...
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WO/1998/016682A2 |
Disclosed is a process for upgrading paper-grade wood pulp to dissolving grade pulp which is suitable for use in the preparation of viscose rayon, cellulose ethers and cellulose esters such as cellulose acetate. The process utilizes a se...
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WO/1998/016684A1 |
The invention relates to an evaporation apparatus for evaporationof, for example, spent liquor from pulp cooking. It comprises a vertical cylinder (1) with inlet and outlet openings for steam and liquid, and evaporation surfaces (3) in t...
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