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WO/2008/141121A1 |
A method of monitoring and inhibiting scale precipitation and deposition from spent liquor in pulp mill evaporators and concentrators is disclosed. The method includes connecting a black liquor deposition monitor to a pulp mill evaporato...
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WO/2008/129117A1 |
A method for burning chlorine-containing liquors in a chemical recovery boiler at a pulp mill, wherein the recovery boiler includes spent liquor sprayers for feeding spent liquor and a number of combustion air levels including: increasin...
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WO/2008/118071A1 |
The invention concerns an arrangement for positioning equipment in association with an opening in a boiler wall. The arrangement comprises a rotation mechanism (26, 34, 35) that rotates the equipment around a virtual rotation axis (27) t...
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WO/2008/104074A1 |
The present invention relates to a composition comprising water, more than 30 % w/w of calcium hydroxide, and ≥ 0.2 % w/w dispersant. A process for preparing such a composition is also disclosed. The composition which can be in the for...
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WO/2008/079072A1 |
There is disclosed a method for recovering a low sodium content lignin from spent kraft cooking liquor without the use a of strong mineral acid for acidulation comprising the steps of acidulating a spent kraft cooking liquor with carbon ...
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WO/2008/063123A1 |
The invention concerns an arrangement and a method for the leaching of electrical filter ash that contains potassium and chlorides. The electrical filter ash undergoes mixing in the invention with leaching fluid in a first recirculation ...
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WO/2008/057031A1 |
The invention concerns a method and equipment for the evaporation of hot black liquor obtained from a digestion process during the production of cellulose pulp, where the black liquor is led to a multistage evaporation line with at least...
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WO/2008/046959A1 |
The invention is related to a method for emptying a furnace floor in a soda recovery boiler when the soda recovery boiler is being shut down. The emptying may be started while smelt is still flowing in smelt spouts. The floor is emptied ...
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WO/2008/044984A1 |
The disclosure relates to an apparatus for cleaning an opening (1) in the wall (2) of a soda recovery boiler (3), and an outlet spout (4), the apparatus comprising a carrier (5) for a cleaning device (6) and drive means (7). The carrier ...
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WO/2008/018358A1 |
An agent for accelerating the dehydration of lime mud, comprising a polyoxyethylene polyoxypropylene alkyl ether represented by the general formula (1) as an active ingredient: R1O[CH2CH(CH3)O]m[CH2CH2O]n (1) wherein R1 represents a line...
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WO/2008/006190A1 |
The process for preparing a refinery feedstock from black liquor soap comprising adding excess alcohol (preferably methanol) to black liquor soap. Acid is then added to the mixture to drop the pH of the mixture to approximately 2 to conv...
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WO/2007/136889A1 |
A cleaning apparatus for cleaning a smelt spout of a boiler is provided. The boiler includes a boiler wall defining an outlet port for discharging molten smelt and the smelt spout is positioned with respect to the outlet port so that the...
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WO/2007/135184A2 |
The invention relates to a method for the catalytic oxidation of sulfide (S2-) to sulfate (SO4 2-), particularly alkali metal sulfides, alkaline earth metal sulfides, transition metal sulfides, and ammonium sulfide to the respective sulf...
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WO/2007/120091A1 |
The present invention provides a method for extracting polymeric pentose, preferably xylan, from a polymeric pentose containing liquid/slurry, preferably black liquor, comprising the following steps: a) providing a polymeric pentose cont...
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WO/2007/090926A1 |
An improved method for treating lignocellulosic material, including a prehydrolysis-mass transfer process, which produces a concentrated hydrolysate volume during the time required for the hydrolysis itself. The improved process comprise...
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WO/2007/090925A1 |
An improved method for treating lignocellulosic material, including a prehydrolysis-mass transfer process, which produces a concentrated hydrolysate volume following steam hydrolysis. The improved process comprises the heating of the dig...
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WO/2007/075574A1 |
The present invention relates to thermoset and polyareneazole pulp for use as reinforcement material in products including for example fluid seals and friction materials, as a processing aid including its use as a thioxotrope, and as a f...
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WO/2007/073333A1 |
The invention concerns a system and a method for the generation of steam in a digester plant for the production of chemical cellulose pulp. The pressure of hot, pressurised black liquor from a digester (4) is reduced in a first step (11 ...
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WO/2007/065241A1 |
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 acid and/or ammonium hydroxide and water...
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WO/2007/067127A1 |
In the production of pulp and paper, impure process liquids arise and there is a need to purify the same in an efficient way at an acceptable cost. The present invention makes this possible and consists of a method for the purification o...
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WO/2007/030078A2 |
A chemical reactor and a method for arranging a ceramic barrier in a gasifying reactor, which reactor is arranged to convert high energy organic waste of black liquor type with a large amount of organic or inorganic alkali metal compound...
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WO/2007/006150A1 |
A direct monitoring method is provided for the online measurement of the concentration of individual polysulphide species, e.g. trisulphide, tetrasulphide and inactive polysulphide, in process liquors used in the production of kraft pulp...
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WO/2006/126929A1 |
A device for cleaning an opening (2) in the wall (1) of a soda recovery boiler has a carrier (5) with an elongate cleaning device (4) which is insertable in the opening. The carrier has or is connected to drive means for executing a clea...
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WO/2006/111608A1 |
A spent liquor recovery boiler in the pulp and paper industry including a water/steam circulation system having superheaters, said circulation system being connected to a steam turbine comprising a high-pressure part, and a furnace for b...
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WO/2006/085762A1 |
The invention is directed to a process for the conversion of cellulosic biomass, in particular lignocellulose-containing biomass into fermentable sugars. The invention is further directed to apparatus suitable for carrying out such proce...
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WO/2006/056649A1 |
The present invention relates to a method of treating lime mud slurry being generated in a causticizing process in a pulp mill in a disc filter, in which method the lime mud is fed in the filter, thickened on the filter discs and removed...
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WO/2006/045884A1 |
A cooling system for air ports (4) and other ports in furnace walls (1) includes a cooling medium pumping system and ports provided with a cooling medium piping (3) or channels inside the metallic port material (2). The liquid flow gener...
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WO/2006/042901A1 |
The present invention relates to an arrangement and a method for enlarging a boiler, especially a chemical recovery boiler, and in that way for optimizing and simplifying a capacity increase. An object of the present invention is to prov...
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WO/2006/040402A1 |
An arrangement is disclosed for supplying an air jet form to the furnace of a recovery boiler, where the furnace has a front wall, a rear wall and side walls. Black liquor spraying devices are disposed on the furnace walls on one or seve...
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WO/2006/038863A1 |
The present invention provides a method for precipitating (separation) of lignin, using small amounts of acidifying agents, whereby a lignin product or an intermediate lignin product is obtained which can be used as fuel or chemical feed...
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WO/2006/037858A1 |
A method and an apparatus for preparing cellulose pulp, in which a lignin-containing raw material is impregnated with impregnation liquor and the impregnated raw material is cooked. The black liquor obtained by cooking is concentrated in...
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WO/2006/037857A1 |
A method and a device for preparing cellulose pulp, in which a lignin-containing raw material chopped into pieces, is impregnated with an alkaline, polysulfide-containing impregnation liquor and the thus impregnated lignin-containing raw...
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WO/2006/038072A1 |
It is intended to efficiently isolate lignin and alkali from an alkaline black liquor discharged in the papermaking/paper pulp mill industry and use a treated water as a clean water. An acid is added to the black liquor so as to adjust t...
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WO/2006/031175A1 |
The present invention provides a method for separation of lignin from black liquor comprising the following steps: a) Precipitation of lignin by acidifying black liquor and thereupon dewatering, b) suspending the lignin filter cake obtai...
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WO/2006/029478A2 |
A process for the treatment of an effluent stream from a pulp mill having one or more liquor streams and one or more recovery processes for recovering useful components from spent liquor, wherein the effluent stream is contacted with ani...
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WO/2006/019342A1 |
The present invention relate to a two-stage gasification process using a gas generator for the recovery of strongly alkaline chemicals and energy value from a cellulose spent liquor. The temperature in the first reaction zone of the gas ...
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WO2005116329A9 |
A method and an arrangement for cleaning at least one of filter sheets and filter cakes in a pressurised white liquor filter 101 with spray nozzles and driving fluid. The white liquor filter 101 is used in a causticizing process in which...
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WO/2005/118950A1 |
The invention relates to a method for producing a chemical conversion pulp, which comprises the following steps: obtaining a chemical pulp by conventional pulping methods, at least one alkaline pulping step, in which the chemical pulp is...
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WO/2005/118113A1 |
The present invention relates to a method for reducing nitrogen oxide emissions in combustion. Fuel is combusted in a first zone, whereby nitrogen oxides are generated. Supplementary fuel is fed in another zone under reducing conditions....
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WO/2005/116327A1 |
Methods for continuously producing pulp from lignocellulose-containing material in a digester are disclosed in which the porous lignocellulose-containing material is fed from the top to the bottom of the digester, liquor is pumped throug...
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WO/2005/100681A1 |
A method and an arrangement for dewatering and washing a lime slurry (106) before the dewatered lime mud is passed to a lime mud kiln (200). The invention is based on the dewatering of the lime slurry in a pressurised lime mud filter (10...
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WO/2005/092484A1 |
A system and a method for admixing a liquid-state medium to a liquid-state flow, comprising a pump (2) for transporting the liquid-state flow in a pipe (1) and an admixing device (4) for the liquid-state medium. A second pipe (3) with sm...
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WO/2005/075730A1 |
The object of the invention is to reduce foaming of black liquor. It is based on observation about the effect of colloidal neutral substances on the separation of soap. According to the method foaming of the black liquor is reduced by ad...
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WO/2005/064075A1 |
According to the invention, polysulfide is used in the manufacture of kraft pulp in the initial stage of a displacement batch process in order to improve the yield. Polysulfide-containing white liquor is added intermixed with the first l...
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WO/2005/059242A1 |
The invention relates to a method for handling a mixture of liquor and soap that is obtained in connection with pulp digestion. In the method according to the invention, the pressure and liquid level in a tank is measured, where after re...
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WO/2005/058969A1 |
The invention relates to a method for purifying aggregates that are contaminated with macromolecular carbohydrates and/or the degradation products thereof. The inventive method is characterized in that in at least one step of the method ...
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WO/2005/056917A2 |
The object of the present invention is a method and apparatus for improving the causticizing process where, in order to adjust the temperature of the green liquor prior to mixing of lime to the green liquor, the temperature of the weak l...
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WO/2005/054572A1 |
A method of treating spent alkaline pulping liquor (black liquor) includes the steps of providing black liquor having lignin therein. Phosphate comprising rock is contacted with an acid solution, wherein an acidulated phosphate rock slur...
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WO/2005/045126A1 |
A method is provided for treating black liquor particularly derived from nonwood pulp, by heating with an alkaline earth metal oxide in a toroidal fluidised bed reactor (304) at a temperature of above 650°C. The method may be used alone...
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WO/2005/038127A1 |
A device for charging a fiber material suspension (1) comprising cellulose fibers, comprising an arrangement (2) of machines for charging the fiber material suspension (1) with calcium carbonate, fed by flue gas (3) containing carbon dio...
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