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Matches 551 - 600 out of 1,026

Document Document Title
WO/1995/021961
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/1995/020065
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/1995/020066
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/1995/018260
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/1995/018261
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/1995/013419
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/1995/012708
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/1995/000698
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/1994/029510
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/1994/029425
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/1994/028236
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/1994/025137
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/1994/025668
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/1994/024362
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/1994/024363
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/1994/023120
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/1994/020670
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/1994/019533
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/1994/018382
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/1994/012719
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/1994/011566
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/1994/011565
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/1994/011567
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/1994/011564
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/1994/009203
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/1994/002680
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/1994/001769
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/1993/024621
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/1993/022490
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/1993/022492
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/1993/022493
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/1993/020279
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/1993/016227
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/1993/015261
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/1993/014260
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/1993/012287
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/1993/009059
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/1993/004232
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/1992/020856
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/1992/018638
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...  
WO/1992/017592
The present invention provides the cloning and expression of purified and isolated DNA molecules, obtainable from fungi, which encode enzymes having arabinan-degrading activity. The present invention also provides DNA constructs containi...  
WO/1992/015751
Waste cellulosic material, for example corrugated paperboard is cooked in an aqueous alkaline cooking liquor (26) to produce a brownstock pulp having a kappa number lower than that of the waste material; combustion of organic materials (...  
WO/1992/013849
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...  
WO/1992/013960
White-rot fungi are grown on a sugar beet pulp substrate. By-products of fungal growth, such as lignin-degrading enzymes, can be recovered from the culture. The culture or enzymes recovered from the culture can be used to degrade aromati...  
WO/1992/008842
A process for delignifying and optionally bleaching nonwoody lignocellulosic substrates to produce a dietary fiber suitable for human consumption is disclosed. The process involves (a) an optional first step of treating the substrate wit...  
WO/1992/007994
A pulp preparation process in which pulp treatment is expanded to include in-digester treatments (Figures 7, 8, 9) previously performed outside of the digester (12) in discrete process equipment. Specifically, a manner for in-digester bl...  
WO/1992/005309
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...  
WO/1991/018864
The invention relates to a process for the recovery of a lower aliphatic acid, such as formic acid, from chemical pulp. A pulp which contains formic acid is first vacuum evaporated at 70-100 �C, and ultimately the vacuum-evaporated pul...  
WO/1991/018863
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...  
WO/1991/018145
A process for delignifying and bleaching a lignocellulosic pulp without the use of elemental chlorine by partially delignifying the pulp to a K No. of about 10 or less and a viscosity of greater than about 13 cps; and further delignifyin...  

Matches 551 - 600 out of 1,026