| Patents for D21C 3 - Pulping cellulose-containing materials (5,020) |
|---|
| 10/24/2002 | US20020155292 Lyocell fiber from sawdust pulp |
| 10/24/2002 | US20020153108 Use of an aqueous unsaturated solution containing an ionic mixture of ammonium and magnesium bisulphite salts fully dissociated for wood delignification |
| 10/24/2002 | DE10119182A1 Continually-operated cellulose digester is inclined to the horizontal with lower inlet and upper outlet |
| 10/22/2002 | US6468390 Impregnating fibers with alkali metal hydroxide, withdrawing spent liquid, cooking and reintroducing hemicellulose rich fraction which is precipitated onto fibers to improve yield and beatability of pulp |
| 10/17/2002 | WO2002081816A1 Wood chip treatment |
| 10/17/2002 | US20020148575 Cellulose production from lignocellulosic biomass |
| 10/17/2002 | US20020148573 Method for removing wax from a pulp furnish |
| 10/17/2002 | US20020148050 Fibers characterized by pebbled surfaces and variable cross sections and diameters produced by centrifugal spinning, melt blowing or spunbonding; low gloss, reduced tendency to fibrillate and enhanced dye receptivity |
| 10/16/2002 | EP1249531A2 Method of producing pulp for paper manufacture |
| 10/16/2002 | CN1092631C Easily dispersive anthraquinone and its production and application methods |
| 10/15/2002 | US6464828 Polyester water-based defoamer |
| 10/15/2002 | US6464827 For manufacture of paper; sodium hydroxide and sodium sulfide |
| 10/10/2002 | US20020144794 Oxidizing a white liquor with oxygen gas in the presence of lime mud, manganese dioxide or both, to a controlled temperature to increase the concentration of ultraviolet or visible radiation absorption |
| 10/09/2002 | CN1092268C Production method of south Africa Hibiscus cancellatus paper pulp |
| 10/03/2002 | US20020139497 Metal extraction prior to chelation in chemical pulp production |
| 10/03/2002 | US20020139496 Prehydrolyzing hardwood chips with water, kraft cooking, bleaching and caustic treatment |
| 10/02/2002 | EP1245723A1 Method for recovering chemicals in a process of producing pulp by kraft process |
| 10/02/2002 | EP1245721A1 Digestion method for pulp |
| 10/02/2002 | CN1372038A Pulping technology of directional catalyzing separating grass fibre |
| 10/01/2002 | US6458245 CTMP-process |
| 09/26/2002 | WO2002075044A1 Continuous digester for cellulose pulp including method and recirculation system for such digester |
| 09/26/2002 | WO2002075043A1 Method for producing pulp |
| 09/26/2002 | WO2002075042A2 Method for separating hemicelluloses from a biomass containing hemicelluloses |
| 09/25/2002 | EP1242677A1 Pulping process for corn stover and other nonwood fibrous materials |
| 09/25/2002 | EP1242674A1 Process for preventing scaling of heat transfer surfaces |
| 09/25/2002 | CN1371439A Pulping process for corn stover and other nonwood fibrous materials |
| 09/19/2002 | US20020129912 Delignifying chips of a lignocellulosic material in a sulfite pulping; bleaching fibrous material which is performed exclusively with chlorine-free reagents and comprises bleaching with oxidant in presence of base |
| 09/18/2002 | EP1240511A1 Determination of kappa number in chemical pulps by raman spectrometry |
| 09/12/2002 | DE10109502A1 Removal of hemicellulose from biomaterial, especially wood pulp, involves extraction by treatment with an aqueous solution of metal complex, e.g. nickel tris-2-aminoethyl-amine di-hydroxide |
| 09/11/2002 | EP1238141A1 Fibers from plant seeds and use |
| 09/11/2002 | CN1368577A Paper pulp made of banana tree and its technology |
| 09/10/2002 | US6447639 Process for controlling a digester using real time measurement of moisture content and species of wood |
| 09/10/2002 | US6447614 Raw material for use in the preparation of pectin and related compounds, and a method for the preparation of same |
| 09/10/2002 | CA2197312C Enhancements in pulping with dissolved solids control |
| 09/05/2002 | US20020121349 Process for controlling a digester using real time measurement of moisture content and species of wood |
| 09/05/2002 | US20020121348 Process for digesting woodchips and digester additives |
| 09/03/2002 | US6444314 High hemicellulose content of at least 5%, a low lignin content as measured by a kappa number less than 2.0; enhanced dye-binding properties and a reduced tendency to fibrillate. |
| 08/27/2002 | US6440547 Lyocell film made from cellulose having low degree of polymerization values |
| 08/27/2002 | US6440523 Lyocell fiber made from alkaline pulp having low average degree of polymerization values |
| 08/22/2002 | US20020115181 Enzymatic polypeptide for use in paper making and animal feeds |
| 08/22/2002 | US20020112828 Process for digesting woodchips and digester additives |
| 08/20/2002 | CA2049322C Process for preparing kraft pulp |
| 08/15/2002 | US20020108728 Continuous digester |
| 08/01/2002 | WO2002059417A2 Heat treatment of polysulphide containing white liquors |
| 07/31/2002 | CN1361327A Clean production process of making grass pulp |
| 07/30/2002 | US6425975 Process for concentrating soluble and colloidal substances in process waters |
| 07/30/2002 | CA2104962C Recycling waste cellulosic material |
| 07/25/2002 | US20020096276 Absorbent products and methods of preparation thereof |
| 07/25/2002 | DE10064131A1 Vollgebleichter Sulfit-Zellstoff, Verfahren zu seiner Herstellung und daraus hergestellte Produkte Vollgebleichter sulfite pulp, process for its production and products made from |
| 07/24/2002 | EP0823004B1 Impregnation of cellulose-containing material with black liquor in a single vessel digester |
| 07/24/2002 | CN1088129C Process of producing viscose fibre pulp with bamboo |
| 07/16/2002 | US6419788 Heating, pressurization |
| 07/16/2002 | CA2189899C Cooking cellulose material using high alkali concentrations and/or high ph near the end of the cook |
| 07/11/2002 | WO2002053829A1 Method for producing furfural, acetic acid and formic acid from spent pulp-cooking liquor |
| 07/11/2002 | US20020088576 A lignocellulose material is cooked by means of an alkaline cooking liquor containing polysulfides in the presence of a quinone-hydroquinone compound having an oxidation reduction potential value within a range of 0.12 to 0.25V |
| 07/11/2002 | US20020088572 Process for making lyocell fibers from alkaline pulp having low average degree of polymerization values |
| 07/11/2002 | US20020088568 Partial autocausticization of alkali liquors for wood pulping processes |
| 07/09/2002 | US6416621 Apparatus, process and pressure reactor for the treatment of solids with pressurized liquid gases |
| 07/09/2002 | CA2191207C Improved chip feeding for a continuous digester |
| 07/04/2002 | WO2002052101A1 Fully bleached sulfite chemical pulp, a process for the production thereof and products derived therefrom |
| 07/02/2002 | US6413367 Chelation and steaming cellulose and lignin derivatives containing metal impurities; pulping |
| 07/02/2002 | CA2050818C Impregnation with black liquor prior to white liquor introduction |
| 06/27/2002 | US20020081428 Molded bodies made from compositions having low degree of polymerization values |
| 06/27/2002 | US20020079071 Process for continuous cooking of pulp |
| 06/27/2002 | US20020079070 Process for continuous cooking of pulp |
| 06/20/2002 | US20020076556 Lyocell film made from cellulose having low degree of polymerization values |
| 06/05/2002 | CN1352716A Method for separating lignocellulose-containing biomass |
| 06/05/2002 | CN1352336A Method for producing cotton pulp big using lateral pipe continous steaming and bleaching process |
| 06/04/2002 | US6398914 Measuring spectral intensities |
| 05/30/2002 | WO2002042551A1 Method for alkaline batch cooking of fiber material |
| 05/30/2002 | WO2002042550A1 Method for alkaline cooking of fiber material |
| 05/30/2002 | US20020064654 High hemicellulose content of at least 5%, a low lignin content as measured by a kappa number less than 2.0; enhanced dye-binding properties and a reduced tendency to fibrillate. |
| 05/29/2002 | CN1085755C Paper-making pulping process without black liquid |
| 05/29/2002 | CA2363939A1 Method to improve kraft pulp brightness and bleachability and reduce bleaching effluent discharge |
| 05/28/2002 | CA2363793A1 Method to improve pulp yield and bleachability of lignocellulosic pulps |
| 05/23/2002 | US20020060382 Contacting cellulose and hemicellulose with a reducing agent and reducing the copper number |
| 05/23/2002 | US20020059994 Acid is added to the lignocellulosic material rendering the lignin insoluble; salts, especially sodium salts, are precipitated out of the process. |
| 05/15/2002 | EP1205597A1 Process for continuous cooking of pulp |
| 05/10/2002 | WO2002036876A1 A cooking process using hot black liquor |
| 05/10/2002 | CA2425381A1 A cooking process using hot black liquor |
| 05/09/2002 | US20020053640 Determination of ionic species concentration by near infrared spectroscopy |
| 05/08/2002 | EP1203841A1 Process for continuous cooking of pulp |
| 05/03/2002 | CA2357393A1 Process for continuous cooking of pulp |
| 04/30/2002 | US6379504 Adding steam and cooking liquor to flow of sawdust to produce heated slurry of sawdust and cooking liquor; passing heated slurry downwardly in static down-flow retention vessel, retaining slurry; cooling |
| 04/25/2002 | DE10049340C1 Verfahren zur Herstellung von Holocellulose durch Delignifizieren von lignocellulosehaltiger Biomasse A process for preparing holocellulose by delignifying lignocellulose-containing biomass |
| 04/23/2002 | CA2048618C A method of de-inking waste paper materials |
| 04/17/2002 | EP1196641A1 Preparation of chemical pulp and xylose, utilizing a direct acid hydrolysis on the pulp |
| 04/11/2002 | WO2002029155A1 Method for producing holocellulose by the delignification of a biomass containing lignocellulose |
| 04/11/2002 | US20020041961 Process for making a composition for conversion to lyocell fiber from an alkaline pulp having low average degree of polymerization values |
| 04/10/2002 | EP0834051B1 Method and apparatus for treating material which conducts heat poorly |
| 04/09/2002 | CA2069107C Process for the preparation of cooking liquors having high sulphidity for sulphate pulp cooking |
| 04/03/2002 | EP1192311A1 Foam-controlling process |
| 04/03/2002 | EP0823948B1 Method of producing a pulp of cellulosic material |
| 03/28/2002 | US20020037407 Readily cut into staple lengths and can be spun into yarns with excellent knitting and weaving characteristics and dyeability; cotton-like denier |
| 03/28/2002 | US20020036070 Cellulosic pulp having low degree of polymerization values |
| 03/27/2002 | EP1190137A1 Method for separating lignocellulose-containing biomass |
| 03/21/2002 | US20020034638 Lyocell fiber made from alkaline pulp having low average degree of polymerization values |
| 03/21/2002 | DE10041077A1 Verfahren zur Prozesskontrolle bei der Zellstoffherstellung Method for process control in pulp production |
| 03/20/2002 | EP1092058A4 Method for selectively delignifying lignocellulosic materials |
| 03/19/2002 | US6358904 Multicomponent bleaching system |