| Patents for D21C 1 - Pretreatment of the finely-divided materials before digesting (1,872) |
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| 11/11/2001 | CA2345762A1 Feeding comminuted fibrous material |
| 11/11/2001 | CA2345759A1 Metal removal from comminuted fibrous material during feeding |
| 11/08/2001 | US20010037865 Producing pulp (cellulose sulfate) with continuous digester system, controlling temperature and alkaline levels |
| 10/30/2001 | CA2184706C Impact of temperature and alkali charge on pulp brightness |
| 10/17/2001 | EP1144756A1 Kraft wood fibers for carboxyalkyl cellulose |
| 10/17/2001 | EP0837965B1 Impregnation of fiber material |
| 09/05/2001 | EP1130155A1 Pulping process |
| 09/04/2001 | US6284095 Minimization of malodorous gas release from a cellulose pulp mill feed system |
| 08/28/2001 | US6280575 Frusto-conical outlet for a cellulose material treatment vessel |
| 08/28/2001 | US6280567 Pre-impregnating cellulose-containing material in process vessel with sulphur-containing alkaline liquor; feeding to sloping steaming vessel; separating liquor; steaming; passing liquor through heat exchanger; dividing; flashing; condensing |
| 08/16/2001 | WO2001059203A2 Pulping process |
| 08/16/2001 | WO2001059202A2 Pulping process |
| 08/16/2001 | US20010013398 Photochemical irradiation coupling of furfural with halogen-ated furfural in presence of an acid scavenger such as poly-vinyl pyridine; conversion to such as diacid, dialcohol, dioxirane, diamide, diamine, diimine, dioxime, divinyl |
| 08/16/2001 | CA2399772A1 Pulping process |
| 08/16/2001 | CA2399723A1 Pulping process |
| 07/25/2001 | EP1070174A4 Eucalyptus biokraft pulping process |
| 07/19/2001 | US20010008177 Minimization of malodorous gas release from a cellulose pulp mill feed system |
| 07/10/2001 | US6258207 Alkaline peroxide mechanical pulping of non-woody species |
| 07/07/2001 | CA2330409A1 Metal extraction prior to chelation in chemical pulp production |
| 06/19/2001 | US6248208 Pretreatment of chips before cooking |
| 06/13/2001 | EP0796367B1 Production of prehydrolyzed pulp |
| 06/13/2001 | CN1298986A Aldehyde modified cellulose pulp for prepn. of high strength paper products |
| 06/13/2001 | CN1298984A Grass pulp without pollution and method for reclaiming its by-product |
| 06/05/2001 | US6241851 Treatment of cellulose material with additives while producing cellulose pulp |
| 05/30/2001 | EP1056902A4 Process for production of chemical pulp from herbaceous plants |
| 05/10/2001 | WO2001032715A1 Process for the production of organic products from lignocellulose containing biomass sources |
| 05/03/2001 | US20010000588 Improved separator system for producing pulp with the aid of continuous digester systems |
| 05/02/2001 | EP1095184A1 Method of producing lignocellulosic pulp from non-woody species |
| 04/24/2001 | CA2166618C Pulp production |
| 04/18/2001 | EP1092058A1 Method for selectively delignifying lignocellulosic materials |
| 04/12/2001 | WO2001025531A1 Process for preventing scaling of heat transfer surfaces |
| 04/10/2001 | US6214171 Top separator in a continuous digester system |
| 04/10/2001 | US6214164 Prewashing, crushing, delignifying |
| 03/21/2001 | EP0782642B1 Method and apparatus for the continuous production of cellulosic pulp |
| 03/21/2001 | EP0754257B1 Method of enhancing biopulping efficacy |
| 03/21/2001 | CN1288084A Method for prodn. of paper pulp by using banana tree as raw material |
| 03/20/2001 | US6203662 Transporting fiber material and transport liquid to impregnation zone; heating; separating, withdrawing transport liquid; supplying cooking liquor; cooking; withdrawing hot black liquor; transferring; separating; recovering |
| 03/15/2001 | DE19856582C1 Verfahren zur Gewinnung von Chemiezellstoff aus Hackschnitzeln A process for the production of chemical pulp from wood chips |
| 03/14/2001 | CN2423312Y Horizontal ultra-high hydraulic pulper |
| 03/01/2001 | WO2001014631A1 Composition for increasing the mass absorption of polar systems in hydrophobic-hydrophilic hybrid materials |
| 03/01/2001 | DE19939866A1 Zusammensetzung zur Erhöhung der Massenaufnahme von polaren Systemen in hydrophob-hydrophilen Hybridmaterialien Composition for increasing the mass uptake of polar systems in hydrophobic-hydrophilic hybrid materials |
| 02/28/2001 | EP0866808B1 Methods and apparatus for the extraction of phytochemicals from fibrous plants |
| 02/21/2001 | CN2420317Y Mechanical pulp making equipment by using rice and wheat straw |
| 02/17/2001 | CA2316111A1 Aldehyde modified cellulose pulp for the preparation of high strength paper products |
| 01/30/2001 | US6179958 Method for continuous cooking of cellulose-containing fibre material |
| 01/24/2001 | EP1070174A1 Eucalyptus biokraft pulping process |
| 01/23/2001 | US6176971 Passing hot spent chemical cellulose pulping treatment liquor to a reboiler, then pressurization of the resulting steam for subsequently steaming chips to be pulped |
| 01/23/2001 | US6176970 Delignification of wood pulp |
| 01/09/2001 | US6171494 Hydraulic vessel system having a downwardly feeding separator |
| 12/26/2000 | US6165317 Control of refined pulp quality by adjusting high temperature pre-heat residence time |
| 12/12/2000 | US6159336 Method and device for the continuous cooking of pulp |
| 12/06/2000 | EP1056902A1 Process for production of chemical pulp from herbaceous plants |
| 11/28/2000 | US6153052 Pulping process |
| 11/21/2000 | CA2171681C Improved pulping process |
| 11/09/2000 | DE19916347C1 Verfahren zum Auftrennen lignocellulosehaltiger Biomasse A method for separating lignocellulosic biomass |
| 11/07/2000 | US6143130 Impregnation, chemical digestion of lignocellulose; recovery of pulping liquors by withdrawing a spent polysulfide; converting to sulfur in an oxidation reactor; mixing the sulfur with sulfides to disulfide and recycling |
| 10/19/2000 | WO2000061858A1 Method for separating lignocellulose-containing biomass |
| 09/28/2000 | WO2000056973A1 Device and method of using explosive forces in a contained liquid environment |
| 09/28/2000 | CA2366288A1 Device and method of using explosive forces in a contained liquid environment |
| 09/26/2000 | US6123807 Method for the continuous cooking of pulp |
| 09/08/2000 | WO2000052256A1 Feed preconditioning for chemical pulping |
| 09/08/2000 | CA2363158A1 Feed preconditioning for chemical pulping |
| 08/22/2000 | US6106668 Steaming, slurrying, pressurization |
| 08/17/2000 | WO2000047812A1 Process for oxygen pulping of lignocellulosic material and recovery of pulping chemicals |
| 08/15/2000 | US6103294 Preservative for digestible food and beverage products |
| 08/15/2000 | US6103058 Controlling temperature and alkalinity |
| 08/09/2000 | CN2390909Y Straw-crumbling machine |
| 08/04/2000 | CA2297222A1 Minimization of malodorous gas release for a cellulose pulp mill feed system |
| 08/02/2000 | CN1261635A Super short period paper making process by using poplar and larch by hot jet and grinding wood to make pulp |
| 07/11/2000 | US6086717 Separator having a screen basket disposed in a digester |
| 07/06/2000 | WO2000039390A1 Kraft wood fibers for carboxyalkyl cellulose |
| 06/28/2000 | EP1012375A1 Process and apparatus for treatment of fibrous raw material |
| 06/21/2000 | EP1010805A1 Calcium removal in pulping |
| 06/21/2000 | DE19904349A1 Pulping used paper for recycling has a loosening stage where the hydrogen bridges are broken by steam or gas before a mechanical stirring stage to prepare a suspension for the separation of impurities |
| 06/15/2000 | WO2000034568A1 Method of obtaining alpha dissolving pulp from chips |
| 05/18/2000 | WO2000028133A1 Treatment of cellulosic material with a chelating agent prior to alkaline delignification |
| 05/18/2000 | CA2289325A1 Heat economy enhancements for the recovery and use of energy obtained from spent cooking liquors |
| 05/17/2000 | EP1001076A1 Process and plant for the production of paper pulp |
| 05/10/2000 | EP0874935B1 Process for producing pulp from lignocellulosic plants, and pulp obtained |
| 05/03/2000 | CN1252111A Production of fibrous materials with improved properties |
| 04/27/2000 | WO1999063149A8 Method for selectively delignifying lignocellulosic materials |
| 04/27/2000 | WO1999046444A8 Eucalyptus biokraft pulping process |
| 04/25/2000 | US6054019 Impregnation of fiber material in two subsequent concurrent impregnation zones |
| 04/12/2000 | EP0991808A1 Method and installation for the continuous preparation of paper pulp from lignocellulose textile fibres |
| 03/16/2000 | DE3990074C2 Verfahren zur Vorbehandlung von Zelluloserohmaterial A method for the pretreatment of cellulose raw material |
| 03/01/2000 | EP0981639A1 Method for producing cellulose derivatives |
| 02/29/2000 | US6030492 Continuous cooking of cellulose-containing fiber material by kraft process in single-vessel system, fiber material at start of cooking process being impregnated with black liquor for purpose of achieving pulp strength and energy efficiency |
| 02/22/2000 | CA2032256C Biological method of deinking printed wastepaper |
| 02/09/2000 | CN1243898A Method for decolouring unginned cotton of stiff cotton bolls |
| 12/23/1999 | WO1999066119A1 Arundo donax pulp, paper products, and particle board |
| 12/23/1999 | CA2339064A1 Arundo donax pulp, paper products, and particle board |
| 12/15/1999 | EP0963480A1 Method and device for the continuous cooking of chemical pulp |
| 12/09/1999 | WO1999063149A1 Method for selectively delignifying lignocellulosic materials |
| 12/09/1999 | CA2332897A1 Method for selectively delignifying lignocellulosic materials |
| 12/08/1999 | EP0961851A1 Process for producing fibrous materials with improved properties |
| 12/07/1999 | US5998197 The invention is judged of considerable importance in reducing the substantial amount of downtime caused by pitch deposits and accumulations in the pulp and paper and other industries which convert pulpwoods. |
| 11/30/1999 | CA2197455C Low-resident, high-temperature, high-speed chip refining |
| 11/30/1999 | CA2112771C Composition for producing paper and process for using same |
| 11/30/1999 | CA2009622C Process for reducing the pitch content in wood pulp |
| 11/29/1999 | CA2273379A1 Frusto-conical outlet for a cellulose material treatment vessel |