Login| Sign Up| Help| Contact|

Patent Searching and Data


Matches 551 - 600 out of 2,187

Document Document Title
WO/1995/034712A1
A chip feeding system for a continuous digester provides for a greater rate of delivery of chip slurry to the digester, and is much less expensive than conventional chip feeding systems, typically being only 40-50 % of the height of the ...  
WO/1995/032331A1
Method of stepwise delignification of lignocellulose fiber material by digestion with sulphidic alkaline liquor comprising kraft cooking of wood chips with white liquor. White liquor is distributed during digestion. Ex-digestion liquor i...  
WO/1995/029288A1
An aqueous anthraquinone dispersion utilizable as a pulp digestion aid is produced by dispersing an anthraquinone in water in the presence of a rosin treated with a polyvalent metal to improve the dispersibility of the anthraquinone and ...  
WO/1995/027099A1
This method is a predigestion step (A) for spray-depositing a high-temperature digestion chemical liquid on a raw material for pulp fed into a predigestion hopper (12) while recovering residual digestion chemical liquid immediately, and ...  
WO/1995/026438A1
A method for oxidative degradation of lignin and polysaccharide fragments dissolved during polyoxometalate delignification or bleaching of wood pulp, wood fiber or pulp or fiber obtained from a non-woody plant. The method comprises the s...  
WO/1995/023891A1
A method for improving pulp brightness utilizes a combination of a distributed total white liquor charge during the warm fill, hot fill and cooking stages of a batch cooking process and low cooking temperatures during the cooking stage. ...  
WO/1995/023256A1
Disclosed is a method for improving the kraft pulping and chemical recovery processes. In the method non-traditional pulping chemicals are generated on site and used in addition to the traditional pulping chemicals. The additional active...  
WO/1995/023257A1
The present invention relates to a process for continuous cooking of chemical pulp, in which the chips are fed into a chip chute (3), which is arranged on top of a high pressure feeder (4) for passing the chips into a downstream, pressur...  
WO/1995/021959A1
A delignification process suitable for fertilization and for the processing of a field plant material consists of (a) the heating of a raw material comprising cellulose fiber and lignin for 30-420 min at a temperature of 100-160 �C tog...  
WO/1995/021960A1
The invention relates to an enhanced process for integrating production of agro-fibres in field plant energy production. The process involves separating the cellulose fibres from lignin, comprising (a) heating a raw material containing c...  
WO/1995/021961A1
The present invention relates to a method for optimizing the liquor-to-wood ratio, especially in a pre-impregnation vessel and a continuous digester, when producing chemical pulp. The method is based on a transfer circulation with the ai...  
WO/1995/020065A1
Process for preparing pulp from ligning-containing cellulosic material are disclosed including a prehydrolysis step followed by neutralizing hydrolysate and the prehydrolyzed cellulosic material in the reactor with alkaline neutralizing ...  
WO/1995/020066A1
An improved absorbency material for absorbency applications comprised of a cellulosic fibrous material wherein said cellulosic fibrous material such as pulp is a cold alkali solution treated material at a treatment temperature of less th...  
WO/1995/018260A1
A process for the preparation of free sugars, lignin, lignin by-products, and cellulose pulp using recyclable solvents which have lower critical solution temperatures.  
WO/1995/018261A1
The present invention relates to a method and a device for continuously producing pulp in which finely divided fibre material, preferably wood chips, is impregnated in a first vessel (1), preferably by being fed in at the top (2) and fed...  
WO/1995/013419A1
Digester systems for producing paper pulp from comminuted cellulosic fibrous material take into account the level of dissolved organic materials (DOM), such as lignin, hemi-cellulose, and cellulose, maintaining the DOM level at about 100...  
WO/1995/012708A1
Paper pulp and paper products, and methods of making same, of fibers from reclaimed 100 % cotton denim scrap material from the manufacture of clothing and the like, some of which fibers may retain the dye of the reclaimed material and al...  
WO/1995/000698A1
During the production of kraft pulp, by kraft cooking, one or more hemicellulose-rich extractions are treated to separate and remove a significant portion of the hemicellulose. This may be accomplished by treating the extraction with an ...  
WO/1994/029510A1
The present invention pertains to a process for modifying, breaking down or bleaching lignin, material containing lignin or like substances using oxidation catalysts and suitable oxidizing agents wherein these catalysts are used in combi...  
WO/1994/029425A2
A multicomponent system for use in detergent substances consists of oxidation catalysts and suitable oxidizing agents and aliphatic, cycloaliphatic, heterocyclic or aromatic compounds containing NO, NOH or (A).  
WO/1994/028236A1
A process for the production of a waste-based cellulosic pulp useful for the manufacture of paper and paperboard whether used in admixture with virgin pulp or as the sole pulp component, comprising the steps: a) digesting a waste cellulo...  
WO/1994/025137A1
The invention concerns aqueous anti-foaming agent dispersions whose dispersed phase contains fatty alcohols, ketones and, optionally, naturally occurring and/or synthetic waxes with particular metling points. The preferred application of...  
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...  
WO/1994/024362A1
The present invention relates to a digester for continuous cooking, under elevated pressure and temperature, of fibre material in a vertical digester (1), where fibre material and cooking liquid are fed into the top of the digester, used...  
WO/1994/024363A1
The present invention relates to a scraper device, preferably a bottom scraper arranged at the bottom of a continuous digester for pulp production, which scraper comprises at least one scraper arm (12), preferably arranged with shovel me...  
WO/1994/023120A1
Chemical pulp is produced from hardwood chips in a simplified manner utilizing a continuous digester. An inverted top separator is provided in the circulatory loop between the high pressure feeder and the top of the continuous digester f...  
WO/1994/020670A1
A process is disclosed for producing chemomechanical and/or chemothermomechanical wood products from lignocellulosic raw materials, such as wood chips. The raw materials are impregnated with a SO2-containing solution and then subjected t...  
WO/1994/019533A1
The present invention relates to a straining device in association with the displacement of liquid through a pulp bed preferably in connection with the withdrawal of cooking liquid in a continuous digester (1) for producing chemical pulp...  
WO/1994/018382A1
A method for producing chemi-thermomechanical pulps (CTMPs), wherein wood chips are dipped in chemical reagents; the chips are mechanically defiberized (primary refining) in a pressurised steam atmosphere to give a raw pulp; and said pul...  
WO/1994/012719A1
A process is disclosed for producing viscose from lignocelluloses such as those of deciduous trees, coniferous trees or annual plants. The lignocellulose is first processed in a digester with saturated steam to cause the preliminary hydr...  
WO/1994/011566A1
The present invention relates to a digester for continuous cooking under raised pressure and temperature of fibre material in a vertical digester (1), where input of fibre material and cooking liquid takes place at the top of the digeste...  
WO/1994/011565A1
The present invention relates to a digester for continuous cooking under raised pressure and temperature of fibre material in a vertical digester (1), where input of fibre material and cooking liquid takes place at the top of the digeste...  
WO/1994/011567A1
The present invention relates to a digester for continuous cooking, under elevated pressure and temperature, of fibre material in a vertical digester (1), where fibre material and cooking liquid are fed into the top of the digester, used...  
WO/1994/011564A1
The present invention relates to a digester for continuous cooking under raised pressure and temperature of fibre material in a vertical digester (1), where input of fibre material and cooking liquid takes place at the top of the digeste...  
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...  
WO/1994/002680A1
Non-gas fluid (45), such as a cellulose pulp slurry (e.g. kraft pulp), a liquid containing dissolved solids, etc. is treated with electromagnetic radiation, such as ultraviolet light from a mercury arc lamp, or a laser UV light source. T...  
WO/1994/001769A1
A direct monitoring and control method is provided for on-line measurement of effective alkali, carbonate, sulfate and thiosulfate concentrations in process liquors for the production of kraft pulp. The control method eliminates frequent...  
WO/1993/024621A1
The structure of the T. reesei xln1 and xln2 genes and the primary structure of proteins are described. Enzyme preparations enriched in hemicellulase enzymes are described. Such enzyme preparations may also be partially or completely def...  
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...  
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...  
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...  
WO/1993/020279A1
Solvent pulping is practised using ethanol, methanol, formic acid, or the like by passing the organic solvent countercurrent to the cellulosic fibrous material (wood) being adjusted into paper pulp. The process may be batch or continuous...  
WO/1993/016227A1
Kraft pulp (33) is bleached to a brightness of about 90 CPPA or greater, without the use of chlorinated organic compounds that has commercially acceptable strength properties. During production of the kraft pulp it is subjected to extend...  
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...  
WO/1993/014260A1
An apparatus and method for bleaching high consistency lignocellulosic pulp using ozone supplied in an ozone containing gas. The bleaching reactor apparatus according to the invention is a generally cylindrical vessel (42A, 42B) with a r...  
WO/1993/012287A1
Process for the manufacture of bleached paper pulp having a bleaching index number greater than 55 (photovolt scale). The process consists in combining a preliminary pulp fibre protection phase, involving the use of calcium carbonate to ...  
WO/1993/009059A1
The present invention relates to a fluid reservoir, chiefly a reservoir whose purpose is to constitute a buffer, wherein the liquid level varies substantially, comprising an inlet conduit (1) for liquid, an outlet conduit (2) for liquid,...  
WO/1993/004232A1
A process for the continuous digestion of cellulosic fiber material, comprising impregnation with impregnating liquid consisting of at least one fresh digesting liquor, in a closed impregnating system and subsequent digestion with digest...  
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...  
WO/1992/018638A1
The invention provides a process for hydrolysis of water-insoluble ester in the presence of a lipase derived from a strain of $i(Humicola, Candida antarctica, Pseudomonas, Chromobacterium) or $i(Aspergillus) at pH 3-7, characterized by t...  

Matches 551 - 600 out of 2,187