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7988820 |
Method for cleaning and/or cooling a liquor gun in a chemical recovery boiler
An apparatus for cleaning and cooling a liquor nozzle, the nozzle including at least a liquor tube for feeding liquor and chemicals into a furnace of a recovery boiler. The apparatus includes an...
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7850822 |
System and method of wet oxidation of a viscose process stream
A wet oxidation process is used to control the concentration of reduced sulfur compounds from a viscose process. The wet oxidation process oxidizes the reduced sulfur compounds to convert such...
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7806127 |
Smelt spout enclosure for chemical recovery boilers
An enclosure for a smelt spout of a chemical recovery boiler comprises a skirt having a central region through which smelt flowing from the smelt spout falls into a dissolving tank. The central...
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7575657 |
Method and apparatus for reducing the amount of sludge produced in a pulp and/or paper mill
Method and apparatus for reducing the amount of sludges produced in a pulp and/or paper mill. The sludge produced in a pulp and/or paper mill as a result of waste water treatment is conveyed to...
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7553394 |
Method for removing potassium from ash produced in a kraft pulping process recovery boiler using a Na-type cation exchange organic resin
In the process for producing kraft pulp, performing a potassium ion removal step of flowing an aqueous solution containing ashes recovered from a combustion exhaust gas generated in a black...
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7501042 |
Method and arrangement in connection with a chemical recovery boiler
The present invention relates to a method in connection with smelt removal form a recovery boiler, whereby the smelt is removed from the boiler via a smelt spout surrounded outside the boiler by a...
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7465372 |
Method for treatment of spent liquor
Method for treatment of spent liquor at a pulp mill, in which method at least a part of the spent liquor flow arriving from the evaporation plant is taken to a pyrolysis reactor, wherein it is...
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7351306 |
Cooking of cellulose pulp in a cooking liquor containing pre-evaporated black liquor
The method is for cooking of cellulose pulp in which the raw material, preferably in the form of chips, undergoes a successive elevation of temperature towards the cooking temperature while the...
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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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7291245 |
Process for causticizing green liquor in chemical recovery from black liquor in alkaline pulping
The improved process is achieved by introducing depuration of green liquor and lime before causticization and two special causticization steps in causticization procedure of conventional chemical...
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7231714 |
Corrosion-resistant exterior alloy for composite tubes
An austenitic Ni—Cr—Fe alloy is provided as an exterior tube material for improved cracking and corrosion resistance of composite tubes used to construct the lower furnace section of kraft rec...
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7097738 |
Process for producing pulp
The invention relates to a process for producing pulp from a fibre-based raw material using, as the cooking reagent, a solvent mixture which is based on organic acids and also contains furfural....
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6946057 |
Alkaline process for the manufacturing of pulp using alkali metaborate as buffering alkali
The present invention relates to a new and environmentally sound process for the manufacturing of a chemical pulp from lignocellulosic material with an integrated recovery system for recovery of...
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6799526 |
Methods of improving productivity of black liquor recovery boilers
Methods of increasing the throughput of recovery boilers equipped with at least three levels of injection of air with oxygen enrichment of the air in at least one air level. In one method, a black...
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6790313 |
Method of cleaning sulfide contaminated condensates
A method to remove sulfides and other volatile contaminants from liquor vapor condensate in a pulp manufacturing process, where the mentioned liquor vapor condensate is fed into a stripper, which...
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6770168 |
Process for oxygen pulping of lignocellulosic material and recorvery of pulping chemicals
A substantially sulfur free process for the manufacturing of a chemical pulp with an integrated recovery system for recovery of pulping chemicals is carried out on in several stages involving...
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6761799 |
Method and arrangement for combusting black liquor
The present invention relates to a method and an arrangement for use in connection with the combustion of black liquor. In the method the black liquor is concentrated in a multi-effect evaporation...
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6578529 |
Arrangement for feeding black liquor into a recovery boiler
The present invention relates to an arrangement for introducing black liquor into a furnace of a recovery boiler, said arrangement comprising an elongated tube having an interior surface and an...
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6503369 |
Process for producing cellulose and fertilizer by-product
The invention relates to a process for producing cellulose and a fertilizer by-product by using a closed cycle of cooking chemicals and process waters. In the process of the invention, the pulp is...
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6425974 |
Process for treating wastewater from a bleach plant
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...
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6425976 |
Method for black liquor gasification in recovery boilers
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...
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6348129 |
Treatment of pulp mill condensate with ozone
An aqueous stream such as pulp mill condensate containing one or more sulfur compounds is treated by (a) reacting an aqueous feed stream containing TRS contaminant selected from the group...
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6336994 |
Totally chlorine free bleaching process using recovered filtrate
The present invention relates to a process for producing pulp which is cooked under alkaline conditions and which is bleached without using chlorine-containing bleaching chemicals, in which process...
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6319358 |
Electrolytic causticizing of smelt from a kraft recovery furnace
An electrochemical process is provided for treatment of molten kraft smelt produced from black liquor in a kraft recovery boiler. Treated smelt can be contacted with water to produce white liquor...
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6287415 |
Arrangement in soda recovery boiler for removing melts for maintenance
Arrangement in a soda recovery boiler, comprising normal melt chutes (6) for removing molten salt from the recovery boiler (1). The recovery boiler (1) comprises an outlet (8), mounted in the wall...
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6261411 |
Process for kraft chemical recovery
A method of recovering chemicals from spent black liquor used in a kraft pulping process comprising organic materials having oxygen containing functional groups, the method comprising heating the...
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6183598 |
Process for recovering alkali and black liquor containing silicatae
The invention relates to a process for recovering alkali and heat from a black liquor (5) containing silicate from a soda cook of e.g. grass, reed, straw and bagasse. In the process the black...
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6162408 |
Process for purifying ash which principally consists of sodium sulphate from a recovery boiler
Ash from a recovery boiler is purified by leaching or evaporation-crystallizing contaminants such as, chlorides and potassium salts in water. The leaching or evaporation-crystallizing takes place...
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6143130 |
Polysulfide pulping process
A method for impregnation and chemical digestion of lignocellulosic material and recovery of pulping liquors. A spent impregnating or cooking liquor is withdrawn and sulphurous compounds are...
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6126782 |
Method for non-chlorine bleaching of cellulose pulp with a totally closed counter-current liquid circuit
A method for the manufacture of non-chlorine bleached pulp, from alkaline digested cellulose pulp, wherein a suspension of the cellulose pulp is subjected to a series to oxygen gas delignification...
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6113739 |
Process for washing gas formed by gasifying black liquor
Process for recovering chemicals and energy from black liquor, where the black liquor is gasified with CO, CO2, CH4, H2, and H2 S, in gaseous form, and Na2 CO3, NaOH and Na2 S, in the form of drops...
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6074521 |
Method of separating impurities from lime and lime sludge
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 so that lime sludge or lime is dissolved in a...
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6063237 |
Treatment of solid containing material derived from effluent or waste from wastepaper treating process
A method of treating solid-containing material contained in or produced from an effluent or waste from a process for the treating of waste paper. The solid-containing material includes constituents...
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6062547 |
Quench vessel for recovering chemicals and energy from spent liquors
Provided is a quench vessel containing at least two separate internal vessels. A receiving liquor is contained in the first internal vessel and a washing liquid bath is contained in a second...
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6039837 |
Method of bleaching pulp with ozone wherein the acidity is maintained with an acid solution prepared by electrolysis or electrodialysis
When closing the process of manufacturing cellulose pulp of high brightness, i.e. including the recovery of essentially all waste liquor, there is an untenable enrichment of certain basic elements,...
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6030493 |
Process for recovering chemicals and energy from cellulose spent liquor using multiple gasifiers
Provided is a process for recovering chemicals and energy from spent liquor obtained when producing paper pulp by chemical delignificatation of fibrous raw material. The spent liquor is gasified in...
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6027609 |
Pulp-mill recovery installation for recovering chemicals and energy from cellulose spent liquor using multiple gasifiers
A Pulp Mill Recovery installation for producing liquors containing different concentrations of recovered process chemicals or combustion gasses containing different concentrations of process...
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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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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...
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5984987 |
Black liquor gasification process
Aqueous black liquor is gasified in a molten salt by spraying the black liquor into an enclosed zone above the surface of a turbulent molten salt pool. The black liquor is dried by means of hot...
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5976319 |
Disrupting the flow from the smelt spout of a recovery boiler
The intensity of explosions as a result of hot (750-820 degrees C.) smelt from a pulp mill recovery boiler impacting cool (70-100 degrees C.) liquid in a dissolving tank is minimized by more...
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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...
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5922172 |
Combustion of black liquid and processing of lime sludge in a recovery boiler
A method of modifying the course of combustion when evaporated black liquor is burnt in the furnace cavity of a recovery boiler is described. The method implies that lime sludge is supplied to the...
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5879511 |
Recovery boiler operation with black liquor feed in separate liquid stream and solid stream
The present invention relates to a method of improving the operation of a boiler plant in a chemical pulp mill. At least part of the black liquor flow of the chemical pulp mill is divided into...
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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...
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5824275 |
Secondary and tertiary air nozzle for furnace apparatus
An air nozzle assembly for use in associated combustion apparatus which includes a first elongated housing having first and second axial extremities. The first axial extremity thereof is open to...
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5820729 |
Device and process for dissolving smelt from recovery boilers
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...
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5814189 |
Method for gasifying cellulose spent liquor to produce superheated steam and green liquor of low carbonate concentration
Provided is a novel process for the preparation of an aqueous solution of alkaline compounds from a generator gas, containing carbon monoxide, carbon dioxide, hydrogen and entrained alkaline...
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5759345 |
Process for treating sulphur-containing spent liquor using multi-stage carbonization
To recover the sodium-sulphur compounds following sodium-based pulp processing, e.g. the ASAM process or basic or acidic sodium sulphite processes, the waste liquor is burnt in a lye burning vat...
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5746886 |
Method for the recovery of energy and chemicals from cellulose spent liquor containing potassium using a gasifier
The present invention relates to a method for producing pulp cooked under alkaline conditions, in which method cellulose-containing material is brought into contact, in a digester, with an alkaline...
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