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Patent Searching and Data


Matches 701 - 750 out of 2,338

Document Document Title
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...  
WO1991005103A3  
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...  
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/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/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...  
WO/1990/002835A1
Manufacture of chemi-mechanical pulp from hardwood intended for wood-containing printing paper, especially wood-containing fine paper. The wood material in the form of chips is impregnated in one or two steps at a temperature below 80�...  
WO/1990/002836A1
An improved wood pulping process characterized by the delignification (12) of wood (11) in a solvent (13) wherein the solvent is under supercritical conditions.  
WO/1989/012716A1
Process for producing pulp suitable as raw material for paper, board or fiberboards etc. A pumpable alkaline slurry of fibrous raw material is conducted through a pressurized tube system by the use of pulp pumps, the pressure increasing ...  
WO/1989/009547A1
A non-woody biomass is delignified through extrusion technology, utilizing hydrogen peroxide and an alkali agent, to break down complex biomass materials. The process is useful in forming a higly absorbant fiber material for use as a die...  
WO/1988/007988A1
Disclosed are tetraphenyl porphyrins which are beta-substituted by fluoro or chloro and/or bear electronegative substituents on the phenyl including one or two water solubilizing substituents. The new porphorins are particularly suitable...  
WO/1988/003190A1
A process and apparatus for transforming and/or extracting lignin or its decomposition products from lignin-cellulosic materials. For this purpose, a redox potential in the 200-500 mV range is set by adding oxidizing and/or reducing agen...  
WO/1987/007314A1
Procedure for prebleaching cellulose pulp obtained by a chemical process. The cellulose pulp is treated with a phenol solution at elevated temperature, whereafter the cellulose pulp is, possibly after washing, bleached by single or multi...  
WO/1987/003022A1
Mechanical pulp intended for coated light weight paper (LWC), magazine paper or the like made as follows. Impregnation and preheating of the material, refining in a double-disc refiner, bleaching, refining in a single-disc refiner and sc...  
WO/1987/002721A1
Method for the separation of gases from the cooking liquor of cellulosic pulp during cooking, in which method cooking liquor and, along with it, gases and extract materials are passed through a screen (4) placed on the wall of the digest...  
WO/1987/001402A1
A method for the production of cellulosic pulp comprises defibration of a fibrous raw material consisting of wood chips, straw, bagasse, reed or the like. The fibrous raw material is impregnated by an aqueous solution of sodium carbonate...  
WO/1986/005529A1
Lignocellulosic raw material is pulped with a cooking liquor containing organic peroxyacids, such as peroxyformic acid or peroxyacetic acid, and the defibred pulp is bleached with an alkaline solution containing hydrogen peroxide, the pH...  
WO/1986/002393A1
A process of manufacturing cellulose pulp from wood by division with sulphite cooking liquor containing additions of sulphide and in the presence of a quinonoide or hydroquinonoide compound. According to the invention, the mole ratio bet...  
WO/1986/001843A1
A method of obtaining cellulase deficient strains which have great ability to degrade lignin at the same time. The method comprises crossing a homokaryotic cellulase deficient mutant of a white-rot fungus having a full sexual cycle with ...  
WO/1985/004409A1
Procedure for recovery of soluble carbohydrates present in wood, in connection with the alkaline cellulose digesting process. According to the invention, recovery of carbohydrates takes place at the initial phase of the cellulose digesti...  
WO/1985/002423A1
Method for the production of cellulose by the batch cooking process, wherein the digester is filled with chips and cooking liquor, and the batch is cooked at elevated temperature and pressure in order to obtain a delignified cellulose pu...  
WO/1985/000133A1
Chemical treatment of bulky organic materials, in particular straw and other biomass, with volatile chemicals, such as NH3, SO2, HF, HCl, which is added to the material before, during or after a (semi)continuous compression, in particula...  
WO/1984/004937A1
A process for the chemical pulping of lignocellulosic material, wherein said lignocellulosic material is subjected to an alkaline nitrate cooking procedure at a pH of 11 to 13,5 in the presence of an aluminium salt.  
WO/1984/003527A1
Preparation of cellulose pulp by treating lignocellulose material such as wood, bagasse, etc. in solid phase after impregnation with a chemical reactant, the quantity of aqueous solution during such treatment being very much reduced, fro...  
WO/1984/003304A1
Comminuted cellulosic or starch containing materials, which may or may not contain lignin, are partially or totally hydrolysed or saccharified by an improved organosolv process using an aqueous acetone solvent mixture containing a small ...  
WO/1984/003286A1
Raw sugar-beet pulp impregnated with acidified water is subjected to a succession of alternated compressions and decompressions. This mechanical stress causes a sort of retting of the pulp fibers, that is to say an effect such that they ...  

Matches 701 - 750 out of 2,338