Login| Sign Up| Help| Contact|

Patent Searching and Data


Matches 601 - 650 out of 1,027

Document Document Title
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...  
WO/1991/012368
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/1991/012367
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/1991/010774
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/1991/008337
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/1991/006700
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/1991/006702
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/1991/005103
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/1991/005104
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/1991/005102
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/1990/011401
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/1990/008221
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/1990/002836
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/1990/002835
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/1989/012716
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/1989/009547
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/1988/007988
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/1988/003190
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/1987/007314
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/1987/003022
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/1987/002721
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/1987/001402
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/1986/005529
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/1986/002393
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/1986/001843
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/1985/004409
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/1985/002423
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/1985/000133
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/1984/004937
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/1984/003527
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/1984/003286
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 ...  
WO/1984/003304
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/1984/002428
A battery system (10, 110) wherein an electrolyte solution of lithium hydroxide dissolved in seawater is circulated through a battery cartridge (11, 111). The system is placed under pressure. A portion of the electrolyte mixture is disch...  
WO/1983/003435
In a pulping process comprising: a step (2) of digesting a lignocellulosic substance (F) using a digesting liquid; steps (3, 4) of separating the digested product into pulp and a waste digesting liquid; steps (5, 9) of treating the waste...  
WO/1983/002469
The process involves selection of a lignin-containing fiber source, having a lignin content of at least about 10 %, and thermomechanically pulping the fiber source under temperature/pressure conditions of 300oF-350oF/ 50 psig- 120 psig a...  
WO/1983/002125
A method for delignifying ligno-cellulosic materials and efficiently separate from each other the constituents thereof. Said materials which optionally may be prehydrolized are heated in an aqueous acid medium in the presence of phenol c...  
WO/1983/001469
Preparation of polysulphide for treatment of wood chips so that the wood consumption is reduced in kraft digestion of paper pulp. In an impregnation stage the wood chips are caused to react with black liquor, or black liquor components c...  
WO/1982/003409
Comminuted cellulosic materials which may or may not contain lignin are partially or totally hydrolyzed or saccharified by an improved organosolv process using an aqueous acetone solvent mixture containing a small amount of an acidic com...  
WO/1982/002414
A silicon defoamer comprising silica or silicate made hydrophobic by treatment with a hydrophobic alcohol at a temperature above 100 C until the silica or silicate and the hydrophobic alcohol react, and the use of a defoaming composition...  
WO/1982/001901
Oxidized kraft white liquor is used as a pulping liquor, in excess, to give a residual spent liquor pH of more than 12 so that the resulting pulp quality and colour is equivalent to that of NSSC pulps.  
WO/1982/001902
Procede de pulpage du bois et de l'ecorce dans de l'acide formique avec une concentration d'au moins 35 , la concentration ideale se situant entre 65 et 90 , avec reflux a la pression atmospherique, pour produire de la pulpe de bois et d...  
WO/1982/001568
A method for manufacturing wood pulp which comprises pulping wood with a mixture of ethanol and sodium hydroxide and wood pulp manufactured in accordance with the method.  
WO/1982/001019
A process to produce pulp from vegetable, cellulose-containing fibrous material such as coniferous wood, hardwood, straw, bagasse etc., the fibrous material being treated in several stages. In a first stage the fibrous material is impreg...  
WO/1982/000483
A high yield of a high quality pulp is obtained by cooking fragmented lignocellulose material at a temperature of 180 to 240 C with a mixture of methanol or ethanol and water containing 80 to 98 percent by volume of the alcohol, the mixt...  
WO/1981/003505
Method for selectively defiberizing and delignifying lignocellulose employing a novel alkaline pulping system. The subject pulping system includes a pulping liquor comprising water, a water-miscible organic reagent, and a sulfide or bisu...  
WO/1981/000267
A process for making defibered pulp material comprising the steps of treating fibrous ligno-cellulosic material with aqueous nitric acid or nitrate salts having a nitrate ion concentration of about 0.001 to 9.0 wt.% and containing at lea...  
WO/1980/002574
A method of utilizing kraft black liquor by converting the black liquor to "green liquor" and then oxidizing the green liquor with air in the presence of a quinone compound or spent liquor from the kraft process, the soda semi-chemical p...  
WO/1980/000159
The process comprises the attacking of a cellulosic plant material, by separation of binding substances, such as lignin, by using amino organic compounds. In most of the known processes which use aqueous solutions or dispersions of the a...  
WO/1979/000152
Shelf life of silica based defoamer composition is improved by adding oil soluble resins and optionally aliphatic fatty acids to retard separation and to inhibit settling. The composition is useful in preventing foaming or in defoaming a...  
WO/1979/000119
Minced lignocellulose, such as wood, straw, bamboos, bagasse or any other structured vegetal material, is treated in a discontinuous or continuous process. The process consists in boiling this material in an acidified mixture of solvents...  

Matches 601 - 650 out of 1,027