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Patent Searching and Data


Matches 551 - 600 out of 2,539

Document Document Title
WO/1998/012143A1
This invention concerns a process for cleaning wastewater and recirculating water in paper production, de-inking and bleaching of pulp. This process involves adsorption of water-soluble anionic compounds and compounds dispersed in water ...  
WO/1998/012378A1
A method for reducing emissions of detrimental nitrogen compounds from the chemical cycle of a pulp mill. The method comprises supplying ammonia-containing vent gases separated from salt smelt to the furnace of a boiler (1, 10) at a poin...  
WO/1998/012473A1
Reduction of slagging is improved by targeting slag-reducing chemicals in a furnace with the aid of computational fluid dynamic modeling. Chemical utilization and boiler maintenance are improved.  
WO/1998/010137A1
Continuous measurements are made of a characteristic of the individual components of green liquor fed to a slaker and white liquor exiting from the slaker. The liquor component measurements provide a precise characterization of the liquo...  
WO/1998/002692A1
The present invention relates to a method for eliminating toxic organic substances, wherein said method comprises submitting these substances to combustion in the presence of concentrated processed black liquor. The liquor is obtained du...  
WO/1997/047935A1
The invention concerns a heat exchanger, for use in particular in connection with the process outlets at paper, pulp and board mills, which heat exchanger comprises a number of substantially parallel tubes (11) or equivalent, fitted in a...  
WO/1997/042371A1
The present invention relates to a method and apparatus for intensifying an alkaline pulping process in which a soap-containing fraction is separated from black liquor and treated further in order to separate fibers from the fraction pri...  
WO/1997/042372A1
A process and system for making polysulfides or orange liquor for use in the paper pulping industry are disclosed. The process comprises the steps of forming a slurry comprised of a white liquor and a catalyst or catalysts, introducing a...  
WO/1997/041294A1
A method of continuously producing paper pulp by integrating the process steps of impregnating fiber material and boiling the impregnated fiber material, the boiling being commenced with digesting liquor containing white liquor of high s...  
WO/1997/041295A1
A method for producing polysulfides, which comprises introducing a solution containing sulfide ions into an anode compartment of an electrolytic cell comprising the anode compartment provided with a porous anode, of which at least the su...  
WO/1997/037944A1
The invention relates to a method for essentially complete oxidation of a concentrated liquor (33) containing oxidable organic matter, comprising the following steps performed unter substantial superatmospheric pressure. According to the...  
WO/1997/036043A1
Process for extracting chemicals and energy from black liquor which is obtained during the production of paper pulp by means of the chemical digestion of fibre raw material, in which the black liquor is gasified in a reactor at a pressur...  
WO/1997/035063A1
A method for recovering methanol from sulfur-based wood pulping process vapors (22), which contain at least methanol and dimethyl disulfide. The method involves three steps. The first step consists of introducing the vapors into a first ...  
WO/1997/023686A1
The disclosure relates to a process for the removal of solid CaS (64) from a gas stream in which the CaS has been formed and then the conversion of that solid CaS (64) by reaction with an aqueous NaOH solution (68) to produce solid Ca(OH...  
WO/1997/023687A1
The black liquor (10) from a kraft pulping process is gasified in a fluidized bed reactor (12) in the presence of solid calcium compounds (CaO, CaCO3, Ca(OH)2) which react with the sulfur compounds (H2S, COS) to produce solid CaS. The so...  
WO/1997/023283A1
A method of producing carbohydrate complexes and/or hydrocarbon complexes from organic material(s) which comprises the steps of (i) preparing a dense mixed phase of organic particulate materials entrained with a gas (such as steam) [the ...  
WO/1997/022752A1
Process for preparation of white liquor. Black liquor is burned and the smelt is dissolved to make a green liquor. The green liquor is pressure filtered before it is causticised to produce white liquor. The white liquor is pressure filte...  
WO/1997/021869A1
The invention relates to a process for combusting black liquor in recovery boilers where the intention is to obtain flue gases which have a low content of nitrogen oxides (NOx). The invention is characterized in that ammonia is supplied ...  
WO/1997/019891A1
A novel catalyst has been developed for increasing the rate of oxidizing sulfides, particularly sulfides present in pulping liquor and, in turn, improving the efficiency in paper pulping processes. According to the invention, a sulfide c...  
WO/1997/019220A2
The invention relates to the paper pulp industry, specifically to a process for preparing a pulp cooking solution used for obtaining a fibrous semi-finished product. This involves saturating a solution of sodium carbonate in waste water ...  
WO/1997/016592A1
The invention relates to a process for evaporating spent liquor or other waste liquids from cellulose cooking. The evaporation is performed in a multiplicity of evaporators which are coupled in series and in which the evaporation is driv...  
WO/1997/016380A1
Pulping chemicals and hemicellulose are recovered from a starting solution essentially free of lignin but containing a mixture of hemicellulose and caustic by electrolysing this solution in the anolyte compartment of an electrolytic cell...  
WO/1997/010501A1
A rapid method is provided for the on-line determination of sodium sulfide concentration and/or percent sulfidity in green liquors or smelt solutions used for the production of either kraft or sulfite pulp. The method eliminates manual s...  
WO/1997/007867A1
The invention relates to a liquid distributor for an evaporator, particularly meant for a film evaporator treating liquid suspensions containing solids. The distributor comprises a channel array (3, 4) that distributes the liquid (8) fed...  
WO/1997/006305A1
A method for reprocessing an ozone-containing gas present in a pulp bleaching plant comprising the steps of supplying the ozone-containing gas to a scrubber and reducing the ozone concentration of the gas as the gas flows through the scr...  
WO/1997/003928A1
The present invention relates to a process for treating settlings formed during the biological purification of municipal and industrial waste water and may be used in various fields of industry, in particular in paper and pulp production...  
WO/1997/003245A1
A method of separating impurities from lime or the calcium carbonate or the lime sludge produced in the chemical recovery system of a pulp mill whereby lime sludge or lime is dissolved in a solution containing carbonate or hydrocarbonate...  
WO/1997/002383A1
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 firstly enriched in sulphide and then oxidized.  
WO/1997/002382A1
The invention consists of a method for producing polysulphide by means of oxidizing sulphide in spent liquors from kraft cellulose cooking. It is characterized by green liquor sludge being used as a catalyst during the oxidation.  
WO/1996/038627A2
The invention described in the specification relates to a process and apparatus for the reduction of adsorbable organic halide (AOX), chemical oxygen demand (COD) and color bodies from the filtrates generated in a chlorine compound-conta...  
WO/1996/034235A1
A process of improving the heat efficiency by condensation of vapour in concentrated chemical solutions, according to which vapour and a concentrated chemical solution are introduced into an absorber comprising a cooler/condenser. In acc...  
WO/1996/032998A1
The invention relates to a falling-film evaporator for preferably evaporating spent liquor from chemical pulp cooking. It is characterized in that the tube system (8) consists, in contrast to a conventional falling-film evaporator, of ho...  
WO/1996/032532A2
An apparatus for introducing a low concentration, high-volume non-condensable gas into a chemical recovery steam generator furnace comprising: a plurality of gas inlet pipes, each gas inlet pipe having a source end and a nozzle end, in w...  
WO/1996/032531A1
Steam (preferably clean steam) having less noncondensible gases than steam produced by conventional black liquor flashing is produced from hot black liquor from a digester of a pulp mill. A heat exchanger (19) is utilized and the hot bla...  
WO/1996/029466A1
A high solids black liquor which has solids content of at least 65 % by weight of liquor is mixed with a viscosity reducing additive prior to firing in a chemical recovery furnace. The additive is an admixed compound consisting of monoet...  
WO/1996/027046A1
A plant for making paper pulp and particularly chemical pulp, including at least one impregnation station (25) for impregnating a material produced by crushing wood, a cooking station (20), and a paper pulp bleaching station (28), each o...  
WO/1996/026316A1
Black liquor is subjected to high shear to cause a breakdown of macromolecules contained therein and provide a reduction in viscosity, thereby improving the processability of the black liquor and enabling the solids content to be increased.  
WO/1996/025553A1
The invention relates to a method and an equipment for the processing of lignocellulose materials by continuous pressure hydrolysis, optionally in the presence of inorganic acid, by consequent expansion and separation of the hydrolysate ...  
WO/1996/025554A1
The present invention relates to a method of decreasing the silicon, phosphor and/or aluminium contents of the cooking chemicals in the recovery of chemicals in an alkali delignification process of cellulose-containing material. Melt con...  
WO/1996/025225A1
A process using an electrodialysis system employing cation-selective membranes and anion-selective membranes, particularly monovalent anion-selective membranes, is used to separate kraft pulping liquors into two streams; one that is rich...  
WO/1996/023566A1
Process for purification treatment of liquid (2), preferably condensate or another contaminated liquid obtained when producing paper or paper pulp, the liquid being introduced into a stripper device (1) at an admission point (C), and the...  
WO/1996/019282A1
Alkali metal hydroxide and acid are recovered from alkali metal salts by water-splitting. A two-compartment cell employs monovalent anion-selective membranes and bipolar membranes; a three-compartment cell (1) employs monovalent anion-se...  
WO/1996/016225A1
The invention relates to a device for dissolving smelt chemicals from recovery boilers, a so-called soda smelt dissolver, and to a process for such dissolution using the device. The device is characterized in that it consists of at least...  
WO/1996/015313A1
The present invention relates to a method for continuously cooking kraft pulp in a single-vessel system (1), preferably a single-vessel hydraulic digester, with chips (2) being fed in at a first end (3) of the digester (1), white liquor ...  
WO/1996/015318A1
A method of treating cellulose pulp which is subjected to an oxygen-delignification stage (3), a washing stage (4), an ozone-bleaching stage (1) and a further bleaching stage, for instance a peroxide-bleaching stage (7). A gas mixture of...  
WO/1996/014466A1
Method for complete combustion of aqueous cellulose bleach plant waste liquors, particularly waste liquors from bleaching processes comprising chlorine dioxide bleaching steps, wherein said cellulose bleach plant waste liquor is concentr...  
WO/1996/014468A1
Process for recovering chemicals and energy from spent liquor obtained when producing paper pulp by chemical delignification of fibrous raw material. The spent liquor is gasified in at least two reactors, a first and a second stream of s...  
WO/1996/014464A1
Method associated with bleaching chemical paper pulp, in which a pulp suspension is brought into contact with an ozone-containing gas, after which a residual gas (6), having a partially remaining ozone content, is separated off from the ...  
WO/1996/014467A1
Method of precipitating transition metals and alkaline earth metals out of bleaching department spent liquor from a chlorine-free bleaching process, in conjunction with producing lignocellulose-containing pulp, by means of supplying an a...  
WO/1996/014465A1
Method for recovering/purifying bleaching effluents from a bleaching plant (20) for cellulose fibre, in which bleaching filtrate (6) is supplied to a gas cooling system adherent to a plant (22) for partial or overstoichiometric combustio...  

Matches 551 - 600 out of 2,539