Login| Sign Up| Help| Contact|

Patent Searching and Data


Matches 601 - 650 out of 2,219

Document Document Title
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...  
WO1992008842A3  
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...  
WO/1992/017592A1
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/1992/015751A1
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/1992/013849A1
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...  
WO/1992/013960A1
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/1992/008842A2
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/1992/007994A1
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/1992/005309A1
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...  
WO/1991/018864A1
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/1991/018863A1
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...  
WO/1991/018145A1
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...  
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...  
WO/1991/012367A1
An absorbent, chemithermomechanical pulp produced from lignocellulosic material with a wood yield above 88 %, a low resin content < 0.15 %, a long fibre content above 70 %, a short fibre content below 10 % and a shive content below 3 %. ...  
WO/1991/010774A1
Cellulose pulp, preferably sulphate pulp, from softwood, characterized in that it: (i) has a limit viscosity which lies beneath 900 cm3/g (ii) has a kappa number which is beneath 12, preferably beneath 10, such as beneath 8, and (iii) ha...  
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...  
WO/1991/006700A1
Mechanical and chemimechanical cellulose pulp, particularly paper pulp, is produced at a low energy input by disintegrating and beating wood material in one or more stages. Acccording to the invention, a substance capable of forming comp...  
WO/1991/006702A1
An apparatus and method for use in a batch digesting process to quantitatively displace fluids in the digester (10) by pumping into the digester (10) under pressure a first volume of displacing fluid at the upper end (22) and a second vo...  
WO1991005103A3  
WO/1991/005103A2
An apparatus and method for treating cellulosic wood chips in a digestion process for the liberation of pulp in a caustic hydroxide solution at high pressures and temperatures by delivering preconditioned wood chips to a first chamber (1...  
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...  
WO/1991/005102A1
In a process for manufacturing chemo-mechanical and/or chemo-thermo-mechanical wood pulps, raw materials containing lignocellulose, such as wood shavings, wood chips, pre-ground wood or sawdust, are first impregnated with an aqueous alco...  
WO/1990/011401A1
Alkaline pulping (such as Kraft) processes for various lignocellulosic materials, such as coniferous or desiduous wood chips, into pulp is improved by adding relatively small amounts of a specific digestive additive such as sodium alpha-...  
WO/1990/008221A1
The present invention solves the problem of delignifying technical cellulose pulp in a selective manner which will result in very low residual contents of lignin in the pulp and a correspondingly high quantity of lignin dissolved in spen...  

Matches 601 - 650 out of 2,219