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WO/1993/006298A1 |
The invention relates to a method of producing sodium hydroxide in a pulp mill without causticizing. This is accomplished by converting the sodium carbonate, formed in the boiler in the combustion of black liquor, into carbon monoxide an...
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WO/1993/006297A1 |
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, such as sodium and sulphur. The present...
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WO/1993/005228A1 |
The present invention relates to a method for the combustion of waste liquids in connection with recovering of chemicals from the waste liquid, preferably black liquor from pulp production whereby the liquid (5A) is injected at a given l...
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WO/1993/004000A1 |
Sodium hydroxide is formed from sodium sulphate by a three step operation comprising converting the sodium sulphate to sodium sulphide (26), converting the sodium sulphide to sodium bicarbonate (36), and converting the sodium bicarbonate...
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WO/1993/003815A1 |
The present invention relates to the direct electrolysis of tall oil soap (TOS) to produce crude tall oil (CTO). An aqueous tall oil soap solution (22) generated in a kraft wood-pulping process is placed in contact with an anode (34) in ...
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WO/1993/001890A1 |
The present invention relates to a process for the separation of melt and preferably also solid particles from a gas flow, wherein the said flow arises from the gasification of spent liquor from pulp production, preferably black liquor, ...
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WO/1993/002249A1 |
The present invention relates to a process for the extraction of chemicals and energy from cellulose spent liquors, preferably black liquor obtained in the sulphate cellulose process, wherein the spent liquor is introduced into a gasific...
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WO/1992/021815A1 |
A method of recovering energy and chemicals from a spent liquor which, after thickening to a dry content of 50-90 %, is fed into a reaction chamber (1) in which a plurality of temperature zones are maintained, said method comprising the ...
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WO/1992/020857A1 |
The invention concerns a process for the removal of lignin from lignocellulose-containing material, the bleaching of lignocellulose-containing material (i.e. the enzymatic de-inking of recycled paper) and/or the treatment of waste water ...
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WO/1992/020856A1 |
This invention relates to producing white liquor in a sulphide-lean stream and a sulphide-rich stream to obtain improved efficiencies in a kraft pulp digesting process such as the Kamyr modified continuous cooking process. In a kraft pul...
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WO/1992/018690A1 |
Method of recovering energy from waste liquors from pulp processes, wherein the waste liquor is burned in a waste liquor recovery boiler and energy is recovered from the flue gases, which are formed by producing saturated or partially su...
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WO/1992/016688A1 |
The invention relates to a method of firing black liquor in recovery boilers where the intention is to get fumes having a low content of nitrogen oxides (NOx). The invention is characterized in that a part of the combustion air is added ...
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WO/1992/013804A1 |
A continuous soap skimmer (200) arranged to skim a light phase foamy or viscous material from a heavy phase liquid, the soap skimmer (200) comprising a top float (201) arranged to float partially or completely submerged in the light phas...
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WO/1992/013994A1 |
A method and apparatus for treating black liquor generated in a sulfate pulping process to recover energy and chemicals therefrom includes heating (4) the black liquor (2) at a temperature and for a time period to produce substantial vol...
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WO/1992/013849A1 |
Filtrates from the bleaching and delignification of the pulp are recycled for reuse in pulping, separation, and recovery of lignin (66) and other by-products which results in significant energy savings and mitigation if not the eliminati...
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WO/1992/010265A1 |
The invention relates to a distillation apparatus (1) which is suitable in particular for the distillation of sea water into fresh water. The apparatus comprises a plurality of flat, bag-like elements (3) formed from a thin film material...
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WO/1992/010264A1 |
The invention relates to a distillation apparatus (1) which is suitable in particular for the distillation of sea water into fresh water. The apparatus comprises a plurality of flat, bag-like elements (3) formed from a thin film material...
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WO/1992/009742A1 |
In a chemicals recovery plant in a sulphate pulp mill, in order to provide green liquor with improved sedimentation and filtration properties, there is passed, from a flow (10) of slaked lime and green liquor between a lime slaker (9) an...
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WO/1992/005309A1 |
A process for the continuous mass-production of chemical pulp from cellulosic material without adversely affecting the global environment and natural resources. The process comprises the step of digesting cellulosic material with a cooki...
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WO/1992/005118A1 |
A process for removal of adsorbable organic chlorine (AOX) in which the acid-soluble AOX present in kraft chlorination (CD) effluents (12) are destabilized and converted to inorganic chloride by pH shift using the alkalinity and acidity ...
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WO/1991/019042A1 |
The present invention relates to a process for the preparation of a solution of sodium compounds formed together with a gas containing carbon monoxide, carbon dioxide and hydrogen gas, at partial combustion of cellulose spent liquors, th...
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WO/1991/018863A1 |
The invention relates to a process to a process for the recovery of lower aliphatic acids, such as formic acid, and sugars from the spent cooking liquor from a pulping process carried out with these same acids, lignin having been removed...
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WO/1991/019041A1 |
The present invention relates to a process for partial combustion of cellulose spent liquors using a burner equipped with a liquor lance and an atomizing nozzle, which burner is connected to a reactor operating at pressures in the range ...
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WO/1991/017395A1 |
An apparatus for detecting the presence of carryover particles in an upper region of a furnace, such as a smelt bed boiler (10), includes plural spaced apart detectors (52). These detectors monitor discrete portions of the interior of th...
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WO/1991/017307A1 |
A method of bleaching cellulose pulp in several steps comprising a chlorine/chlorine dioxide step, an alkaline extraction step and at least one chlorine dioxide step. Directly after the extraction step clean water is supplied to the pulp...
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WO/1991/015665A1 |
A method and apparatus for generation of electricity by pressurized gasification of black liquor in a combined power plant. The gases produced in the gasification of black liquor are purified and introduced into a gas turbine for generat...
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WO/1991/015628A1 |
A method for treating a mechanical pulp plant effluent waste stream by freezing the effluent stream and separating frozen product. The frozen product contains between about 50 to 150 ppm chemical oxygen demand (COD), and may be reclaimed...
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WO/1991/014824A1 |
It has been found that certain chemicals such as peroxide may be concentrated in an aqueous solution by increasing the pH of a feed liquor to increase the amount of the chemical in an ionized form, i.e. increase the ionized fraction and ...
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WO/1991/012301A1 |
A process in thermally decomposing a carbonaceous raw material in order to recover a gas having industrial value as fuel or starting material for the production of chemicals, and inorganic components in solid and/or molten form is descri...
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WO/1991/012368A1 |
Processes for preparing kraft pulp are disclosed. The processes include pretreating cellulosic material or chips with spent cooking liquor at the temperature of about 20 to 100 �C, followed by heating the impregnated chips at the tempe...
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WO/1991/008337A1 |
The invention relates to a process for preparation, under reducing conditions, of cooking liquors having high sulphidity for sulphate pulp cooking, wherein the black liquor obtained in the cooking process is fed, after evaporation, compl...
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WO/1991/005104A1 |
A method of isolating lignin from a solvent pulping liquor containing lignin and a lower alcohol solvent, comprising the steps of: (1) continuously adding solvent pulping liquor to a stripping column, (2) heating the pulping liquor in th...
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WO/1990/015652A1 |
A thermal system includes a plurality of heat exchangers in series and the same number of flash tanks in series is interposed between two subsequent effects of a multiple effect evaporating system for surface black liquor. The liquor is ...
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WO/1990/014873A1 |
A condenser comprising cooled heat exchangers of some known construction for condensing a gas mixture so that most of the condensable gases in the first section are condensed and in the second section of a condenser a medium for absorbin...
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WO/1990/012637A2 |
A process for dealkalization or acidification of aqueous salt solutions or for the splitting of the salt of such solutions employs a water splitting system of bipolar membranes (3) in conjunction with ion selective membranes (2); a two-c...
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WO/1990/012146A1 |
The process relates to continuous treatment of a fiber pulp with a chemical solution by forming on a filter surface a bed of a fiber material suspension and by feeding it through one or several chemical treatment steps in which the chemi...
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WO/1990/010108A1 |
A method for recovering turpentine and heat in a TMP process in which woodchips are heated in a preheater (14) and the vent vapors (18) from the preheater are passed to the condensing vapor zone (20) of an evaporator condenser-reboiler (...
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WO/1990/006964A1 |
The invention relates to a lignin preparation prepared from black liquor derived from an alkali delignification process, such as the sulphate process, soda process or polysulphide process. The lignin preparation comprises mainly lignin a...
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WO/1990/002838A1 |
An apparatus and method of drying black liquor to a dry solids content of about 100 % in which water is evaporated from the black liquor by direct heat exchange contact with hot smelt from a recovery furnace in which the dried black liqu...
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WO/1990/001663A1 |
A process and apparatus for generating steam from wet fuel, wherein water is evaporated from the wet fuel by bringing the fuel into direct contact with superheated steam. The steam is superheated by bringing it into contact with a hot he...
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WO/1989/007480A1 |
A process is disclosed for separating low molecular weight components from complex aqueous organic mixtures. The process includes preparing a separation solution of supercritical carbon dioxide with an effective amount of an entrainer to...
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WO/1989/004395A1 |
A process for increasing the pulp producing capacity of a kraft mill including the steps of removing at least a portion of the lignin from kraft black liquor and separating the lignin form the aqueous phase. The next step is treating the...
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WO/1989/003911A1 |
A method of removing dissolved and colloidal macro-molecular organic substances from effluents from processes used in the manufacture of pulp and paper, wherein an acid sludge containing cellulose fibres and being acidified to a pH value...
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WO/1988/006203A1 |
Method for cleaning of green liquor from impurities consisting of solid particles. Caustic lime, corresponding to 0,5-10 % of the amount caustic lime necessary for complete causticizing of the green liquor, is added to the green liquor i...
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WO/1988/003191A1 |
When combusting sulfur-free soda black liquor in the presence of iron oxide in a fluidized bed reactor provided with a circulating bed, particle fraction of the size larger than 50 mum is separated from the flue gases and recycled to the...
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WO/1987/004738A1 |
A method of controlling one or more processes in connection with burning, slaking and causticizing lime, said processes comprising lime burning e.g. in a lime kiln (10), washing and filtering of lime sludge e.g. on a lime sludge filter (...
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WO/1987/003315A1 |
A method for decreasing the viscosity and improving the evaporability of a sulfate liquor from a cellulose cook. The temperature of the black liquor is raised above the cooking temperature, preferably to 170 - 190oC for splitting the mac...
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WO/1987/003314A1 |
Process for causticizing a water solution containing alkali carbonate with calcium oxide and hydroxide by bringing the water solution containing alkali carbonate into contact with the calcium oxide or hydroxide and by separating the alka...
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WO/1987/003023A1 |
Waste paper with a high lignin content is pretreated and delignified thereafter with oxygen (4). Prior to the oxygen step, the pulp (3) is dewatered whereby the main part of the white water (7) containing solved aluminium is used directl...
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WO/1986/007396A1 |
Process for recovering chemicals and energy from cellulose waste liquors preferably black kraft liquor obtained in a paper pulp sulphate process, comprising the following, three distinct and separate steps: In the first step the concentr...
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