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WO/1994/025668A1 |
Kraft pulp of increased strength and bleachability may be produced with decreased consumption of effective alkali, and at a lower H factor, by keeping the dissolved organic material (DOM) concentration low substantially through the entir...
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WO/1994/023124A1 |
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 (1) with liquid slag extraction and the ex...
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WO/1994/023122A1 |
A method of treating process water containing metal ions in connection with bleaching pulp of ligno-cellulose-containing material. The process water is brought into contact with an alkaline liquid, which preferably also contains sulphide...
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WO/1994/023123A1 |
A method for reusing spent gas from an ozone bleaching reactor (130) includes steps for removing lint from the spent gas, compressing it, passing it through a reactor (130) in which hydrocarbons and carbon monoxide are destroyed by oxida...
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WO/1994/021857A1 |
The removal of bleaching chemical-consuming metals from treatment fluids in a cellulose pulp mill is facilitated by treating the pulp in an acidic or neutral stage to dissolve metals, washing or thickening the pulp to produce a filtrate ...
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WO/1994/020677A1 |
A method of separating sulphur compounds out of a gas containing carbon dioxide and hydrogen sulphide, in a gas washing system, said gas being obtained by gasification of spent cellulose liquor. According to the invention the gas washing...
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WO/1994/020419A1 |
In an electrochemical treatment the cationogenous components are removed from the cellulose waste lye containing lignin sulphonates in the anode space. Lignin sulphonic acids are produced from the waste lye.
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WO/1994/020675A1 |
In minimizing effluents from a cellulose pulp mill, liquid effluents from a bleach plant are concentrated, and then incinerated to produce a residue including sodium, sulfate, and sodium chloride. This residue is distilled with sulfuric ...
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WO/1994/020676A1 |
The invention relates to a method for cleaning the flue gases of a recovery furnace. According to the method, the flue gases are contacted with a scrubbing liquid in a flue gas scrubber (3) in order to absorb the sulfur and nitrogen comp...
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WO/1994/019091A1 |
A process and an apparatus in black-liquor evaporation for the selective removal, by liquid absorption, of hydrogen sulphide from the generated gas (3) containing hydrogen sulphide as well as carbon dioxide, are disclosed. In the process...
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WO/1994/017240A1 |
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 cooking liquor containing dissolved pot...
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WO/1994/016140A1 |
The invention relates to a method for lime sludge reburning in a fluidising bed. The method is characterized in that a cooling medium (10) is injected immediately above the fluidising bed (3). The invention also comprises means for perfo...
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WO/1994/015020A1 |
Chlorine dioxide for a cellulose pulp mill bleach plant is produced by concentrating (evaporating) liquid effluents from the bleach plant to a concentration level high enough for incineration, incinerating the concentrated effluents to p...
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WO/1994/012829A1 |
The invention relates to a system and a device for firing fuel supplied into the furnace as solid or fluid particles (1), which consist e.g. of spent liquors from the pulp industry and the organic content of which is partly burnt as char...
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WO/1994/012720A1 |
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 used cooking chemicals are recovered in...
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WO/1994/012723A1 |
When producing green liquor for later manufacture of cooking liquor, it is endeavoured that the green liquor shall be readily clarified and/or readily filtered. This endeavour is achieved with the present invention, which relates to a me...
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WO/1994/011570A1 |
A method for controlling the gas recycle loop of an ozone bleaching process wherein an ozone generator (18) produces an ozone containing gas from an oxygen containing feed gas (74) and delivers the ozone containing feed gas to an ozone r...
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WO/1994/011571A1 |
The invention relates to acidification of soap, wherein the acidification is performed with a sodium bisulphite solution produced by absorbing the SO2 entrained in the flue gases obtained from the combustion of odour gases derived from a...
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WO/1994/010085A1 |
The present invention relates to a process for producing hydrogen peroxide, preferably intended for use in the bleaching of pulp, in which the hydrogen gas necessary for producing the hydrogen peroxide is generated wholly or partly by th...
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WO/1994/009204A1 |
The invention relates to a process for dividing up the sulphide content of green liquor into a sulphide-rich part and a sulphide-poor part by crystallizing out sodium carbonate (Na2CO3). The crystallization of the sodium carbonate is eff...
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WO/1994/009203A1 |
A conventional continuous digester is modified so as to provide a countercurrent cook throughout the entire height of the digester. Instead of connecting an upper mid-point extraction screen to a flash tank, that screen is closed off and...
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WO/1994/009205A1 |
An apparatus for use in the pulp industry for recovering heat in the spent liquor recovery boiler, whereby the boiler walls (12, 14) are formed of water-cooled tubes connected to the water/steam circulation system of the boiler. Supply o...
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WO/1994/009206A1 |
A method and apparatus for use in the pulp industry for recovering heat in the spent liquor recovery boiler, whereby the boiler walls (12, 14) are formed of water-cooled tubes connected to the water/steam circulation system of the boiler...
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WO/1994/007797A1 |
The specification describes a process for recovering alkali metal hydroxides from an organic liquor such as black liquors derived from pulping wood chips. The organic liquor is burned in a fluidised bed combustion furnace containing flui...
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WO/1994/007595A1 |
The specification describes a process for pelletising particles of an alkali metal ferrite with an aqueous binder such as a black liquor derived from pulping wood chips. The particles are ground and fed to a microgranulator in measured q...
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WO/1994/005595A1 |
Aqueous suspensions of colloidal particles which particles are both silica based anionic particles and swollen particles of clays of smectite type which are expandable in water and a process for the preparation thereof. The suspensions a...
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WO/1994/005850A1 |
Treatment of process water containing metal ions, in connection with the bleaching of pulp of lignocellulose-containing material. The process water is brought into contact with pulp at pH above 7 and a temperature of 50-120 �C. The pro...
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WO/1994/004747A1 |
The present invention relates to an environmental-friendly process for reducing the content of chloride in a liquor inventory of a chemical pulp mill. According to the invention, in a recovery system for pulping chemicals containing sulp...
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WO/1994/003673A1 |
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. Liquid effluents from the bleach plant (12) ...
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WO/1994/001617A1 |
The invention concerns a method for filtering a product formed in a causticization process, in which filtration process the product is subjected to separation of the filtrate from the solids. The product received from a causticization ta...
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WO/1994/001616A1 |
White liquor (14) is treated with oxygen (13) so as to oxidize all of the sulfur forms within the white liquor to sulfates. This allows the oxidized white liquor to be used in place of caustic in a cellulose pulp bleach plant. To treat c...
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WO/1993/025751A1 |
A black liquor gasification system (10) intended for use as a replacement for a Tomlinson cycle, Chemical Recovery Unit, and which operates at a temperature below the ash melting temperature thereby removing the potential for smelt-water...
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WO/1993/024704A1 |
This invention is a process for recovering chemicals and energy from cellulose waste liquors by partial oxidation of the cellulose waste liquor in a gas generator operating in a temperature range of 600-1500 °C and a pressure in the ran...
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WO/1993/024703A1 |
A process for recovering energy from a combustible gas generated by partial oxidation of cellulose waste liquor in a gas generator (A) operating in a temperature range of 600-1300 °C and a pressure in the range of 1-100 bar, cooling and...
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WO/1993/023502A1 |
The present invention relates to a device for thermal decomposition of stock, especially a spent liquor obtained from pulp manufacture, where the gas stream formed in this connection passes through a liquid bath, which device comprises a...
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WO/1993/023501A1 |
The present invention relates to a device for thermal decomposition of stock, especially a spent liquor obtained from pulp manufacture, where the gas stream formed in this connection passes through a liquid bath, which device comprises a...
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WO/1993/022493A1 |
Off gases (11) from black liquor heat treatment (10) evaporators, wood pulp digesters, etc. are treated to produce primarily hydrogen sulfide and sulfur free fuel gases such as methane, carbon monoxide, hydrogen, and ethylene. Then the h...
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WO/1993/022492A1 |
For the production of cellulose from wood and annual plants, a boiling process is proposed in which the boiling liquor contains free soda lye and sodium salts of the alkylbenzole sulphonic acids or aromatic and aliphatic carboxylic acids...
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WO/1993/022243A1 |
Wood-resin-containing process water or wastewater from the pulp industry is purified by adding, as flocculants, a high-molecular-weight polyethylene oxide and a water-soluble, non-ionic cellulose ether, suitably having a flocculation tem...
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WO/1993/022490A1 |
In order to recover inorganic chemicals from waste liquors in cellulose manufacturing processes it is proposed to separate the alkali or alkaline earth from the organic components by partial or complete oxidation in the aqueous phase wit...
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WO/1993/021118A1 |
The patent claims concern a method for a more efficient "wet combustion" of COD-containing effluents from industrial processes and municipal plants and for a more efficient COD-reduction by enzymes in aerobic and anaerobic biological cle...
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WO/1993/018226A1 |
The off gases from an ozone bleaching stage of a paper pulp mill are treated so as to simultaneously destroy ozone in the off gases, and remove fibers (32) entrained in the off gases without the need for an ozone thermal destruct system....
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WO/1993/017179A1 |
The invention relates to a method and apparatus for use in the pulp industry for improving the safety of a spent liquor recovery boiler, such as soda recovery boiler, whereby the boiler comprises, for recovering chemicals and energy, a f...
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WO/1993/014860A1 |
The present invention relates to a process and a device for the separation and purification of gas from a fibre suspension, especially residual gas after ozone delignification or pulp suspension, wherein the suspension together with the ...
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WO/1993/015261A1 |
Filtrates from the bleaching and delignification of the pulp are recycled for reuse in pulping, separation, and recovery of lignin and other by-products which results in significant energy savings and mitigation if not the elimination of...
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WO/1993/012889A1 |
The present invention relates to a cyclone, mainly for separating liquid from gas/vapour which is formed on pressure reduction of spent cooking liquid in connection with pulp production, comprising a casing (1), an inlet arrangement (2),...
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WO/1993/012288A1 |
A method of preparing digesting liquor having high sulphidity from a spent liquor obtained from digesting cellulosic fiber material, preferably without a conventional causticizing step is described, said method comprising thermal decompo...
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WO/1993/011297A1 |
Method of recovering energy from waste liquors from pulp processes, wherein the waste liquor is burned in a waste liquor recovery boiler (18) and energy is recovered from the flue gases by producing saturated or partially superheated ste...
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WO/1993/010416A1 |
A heat exchanger, evaporator made from the heat exchanger, and method of utilization thereof, take advantage of the thin yet strong and good heat exchange surface that is provided by a metal-plastic laminate. A laminate is typically eith...
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WO/1993/007333A1 |
A method of treating wastewater in pulp bleaching efficiently by decomposing and removing difficultly decomposable colored components and/or chlorinated phenols contained in the wastewater, which method comprises the use of a lignin-deco...
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