| Patents for D21C 3 - Pulping cellulose-containing materials (5,020) |
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| 11/15/2000 | EP1052326A1 Use of oxidized white liquor in a kraft mill digester |
| 11/15/2000 | CN1273618A Method for processing straw into pulp and paper product therefrom |
| 11/14/2000 | US6146495 Kraft process for the production of wood pulp by adding a copolymer of 1,2-dihydroxy-3-butene antiscalant |
| 11/14/2000 | US6146494 Modified cellulosic fibers and fibrous webs containing these fibers |
| 11/11/2000 | CA2307486A1 Use of oxidized white liquor in a kraft mill digester |
| 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 |
| 10/31/2000 | US6139689 Apparatus for digesting pulp in a displacement batch digester that uses displacement liquor having a sufficient hydrostatic head |
| 10/31/2000 | US6139683 Extraction of celluloses from lignocelluloses, the extraction is carried out by means of heating with aqueous acetic acid under pressure and the addition of formic acid, whereby there is obtained a cellulose with a low residual lignin content |
| 10/25/2000 | CN1271038A Rice and wheat straw replacing and digesting technoloy and equipment |
| 10/24/2000 | US6136145 Method for treating pulp in an indirect heat exchanger in connection with bleaching |
| 10/19/2000 | WO2000061858A1 Method for separating lignocellulose-containing biomass |
| 10/19/2000 | WO2000061276A1 Aqueous fractionation of biomass based on novel carbohydrate hydrolysis kinetics |
| 10/17/2000 | US6132556 Varying the flow rate of liquor extracted from the pressure-control extraction to maintain the pressure in the digester at a desired superatmospheric level while maintaining a uniform and stable material movement in the counter-current |
| 09/27/2000 | CN1267762A Mechanical grass plants (wheat straw cornstalk, rice straw & Chinese silvergrass stalk) pulping technology |
| 09/26/2000 | US6123810 Pulping composition containing aminoalkoxylsilanes and a pulping process using the composition |
| 09/26/2000 | US6123808 Distribution of dilution liquor to the discharge of a cellulose pulp digester |
| 09/26/2000 | US6123807 Method for the continuous cooking of pulp |
| 09/20/2000 | EP1036236A1 Pulp production method and apparatus |
| 09/20/2000 | CN1267344A Method for recovery of formic acid |
| 09/13/2000 | CN1266123A Method for treating waste paper |
| 09/13/2000 | CN1266122A Process for preparing Chinese cassia tree dissolving pulp |
| 09/08/2000 | WO2000051708A1 Polyester water-based defoamer |
| 09/05/2000 | US6113742 Digester having screening arrangement for isothermal cooking of fibrous material |
| 09/05/2000 | CA2128241C Pulp bleaching apparatus and method |
| 08/31/2000 | WO2000050689A1 Method for producing cellulose |
| 08/29/2000 | US6110323 Recycling the agricultural waste by hydrolysis and delignifying, forming an absorbent material |
| 08/17/2000 | WO2000047812A1 Process for oxygen pulping of lignocellulosic material and recovery of pulping chemicals |
| 08/16/2000 | CN1263183A Method for raising paper pulp yield and its equipment |
| 08/15/2000 | US6103059 Process for delignification of a lignin containing pulp |
| 08/15/2000 | US6103057 Heating cellulosic material and hot cooking liquor remaining after liquor withdrawal results in superatmospheric pressure inside the digester which is reduced by withdrawing vapor and transferring withdrawn vapor to turpentine recovery unit |
| 08/09/2000 | EP1026312A1 Method and apparatus for pulp yield enhancement |
| 08/09/2000 | EP1025305A1 Chemical method for lignin depolymerization |
| 08/08/2000 | US6098658 Method and apparatus for filling a pulp tower |
| 08/02/2000 | CA2297586A1 Method and apparatus for pulp yield enhancement |
| 07/28/2000 | CA2295268A1 Effluent treatment in process for cellulosic fibrous aggregate preparation |
| 07/26/2000 | EP1021613A1 Method for processing straw into pulp and paper product therefrom |
| 07/19/2000 | CN1260343A Easily dispersive anthraquinone and its production and application methods |
| 07/18/2000 | CA2195297C Two-stage kraft cooking |
| 07/15/2000 | CA2295786A1 Removal of anthraquinone from tall oil and tall oil fractions |
| 07/12/2000 | EP0824616B1 A process for rapid acid hydrolysis of lignocellulosic material and hydrolysis reactor |
| 07/11/2000 | US6086712 DOM control in cellulose pulp production |
| 07/06/2000 | WO2000039390A1 Kraft wood fibers for carboxyalkyl cellulose |
| 07/04/2000 | US6084061 Removal of anthraquinone from tall oil and tall oil fractions |
| 06/29/2000 | DE19859847A1 Medium-density fiberboard production for chipboard and fiberboard involves sealing plates of used fibers or chippings with lignin-dissolving chemicals in an autoclave and pressing |
| 06/28/2000 | EP1012375A1 Process and apparatus for treatment of fibrous raw material |
| 06/15/2000 | WO2000034568A1 Method of obtaining alpha dissolving pulp from chips |
| 06/14/2000 | EP1007571A1 A raw material for use in the preparation of pectin and related compounds, and a method for the preparation of same |
| 06/14/2000 | CN1256334A Stretchy paper producing process |
| 06/08/2000 | WO2000011260A3 Method for producing cellulose |
| 06/07/2000 | EP1005586A1 Method for the recovery of formic acid |
| 05/23/2000 | US6066356 Genetic engineering; animal feeds; foods |
| 05/18/2000 | WO2000028133A1 Treatment of cellulosic material with a chelating agent prior to alkaline delignification |
| 05/18/2000 | WO2000011259A3 Device for making cellulose |
| 05/18/2000 | CA2289325A1 Heat economy enhancements for the recovery and use of energy obtained from spent cooking liquors |
| 05/17/2000 | CN1253193A Production method of south Africa Hibiscus cancellatus paper pulp |
| 05/16/2000 | US6063238 Black liquor impregnation in digester |
| 05/11/2000 | WO2000025600A1 Method for processing straw pulp |
| 05/04/2000 | WO2000024962A1 Paper repulping method |
| 05/04/2000 | CA2348716A1 Paper repulping method |
| 05/03/2000 | CN1252111A Production of fibrous materials with improved properties |
| 05/02/2000 | US6057375 Use of alkoxylation products of epoxidized fats as antifoaming agents |
| 04/27/2000 | WO1999063149A8 Method for selectively delignifying lignocellulosic materials |
| 04/26/2000 | CA2282094A1 Pulp cooking with particular alkali profiles |
| 04/25/2000 | US6054019 Impregnation of fiber material in two subsequent concurrent impregnation zones |
| 04/19/2000 | EP0705327B1 Multicomponent bleaching system |
| 04/18/2000 | CA2138048C Determination and control of effective alkali in kraft liquors by ir spectroscopy |
| 04/13/2000 | WO2000020677A1 Delignified soybean hull fiber and methods of making and using |
| 04/12/2000 | EP0991808A1 Method and installation for the continuous preparation of paper pulp from lignocellulose textile fibres |
| 04/06/2000 | WO2000019004A1 Semi alkaline steam explosion treatment of fibrous material for the production of cellulose pulp |
| 04/05/2000 | CN1249372A Technology and equipment for non-pollution paper making with dry pulp |
| 04/02/2000 | CA2282065A1 Method and apparatus for continuously pulping cellulosic fibrous material |
| 03/30/2000 | WO2000017444A1 Pulping process without a recovery furnace |
| 03/30/2000 | CA2345394A1 Pulping process without a recovery furnace |
| 03/29/2000 | EP0988415A1 Modified cellulosic fibers and fibrous webs containing these fibers |
| 03/29/2000 | EP0988414A1 Method for continuous cooking in a single-vessel digester |
| 03/22/2000 | CN1247915A Acidifying sulfate pulp-making process |
| 03/22/2000 | CN1247914A Digestant for solving the problem of paper-making pollution |
| 03/15/2000 | EP0806978B1 Use of alkoxylation products of epoxidized fats as antifoaming agents |
| 03/15/2000 | CN1247248A Non-pollution pulping and paper-making technology with circulation of all waste liquid |
| 03/14/2000 | US6036817 Composition containing a polymethylalkyl siloxane for enhancing white liquor penetration into wood chips |
| 03/09/2000 | WO2000012810A1 Method for preparation of a fibrous stock out of herb-stemmed plants |
| 03/09/2000 | WO2000012436A1 Process for the inhibition of scale in harsh systems and novel antiscalants for same |
| 03/09/2000 | CA2340057A1 Process for the inhibition of scale in harsh systems and novel antiscalants for same |
| 03/08/2000 | CN1246557A Additives composite capable of reducing anthraquinone quantity demanded in process of pulping wood fibre material and method thereof |
| 03/08/2000 | CN1050164C Manufacture technology of sea-weed fibre |
| 03/02/2000 | WO2000011263A1 Method of preventing scaling |
| 03/02/2000 | WO2000011261A1 Method for precipitating hemicellulose onto fibres for improved yield and beatability |
| 03/02/2000 | WO2000011260A2 Method for producing cellulose |
| 03/02/2000 | WO2000011259A2 Device for making cellulose |
| 03/02/2000 | WO2000011239A1 Inhibition of corrosion in aqueous systems |
| 03/02/2000 | CA2339982A1 Inhibition of corrosion in aqueous systems |
| 03/01/2000 | EP0861347B1 Method of obtaining cellulose fibre material from a plant substrate containing calcium pectinate |
| 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 |
| 02/15/2000 | US6024837 Low temperature gas phase continuous digester |
| 02/09/2000 | EP0977918A1 A wood delignification chemical process using ammonium magnesium bisulphite as the active reagent |
| 02/08/2000 | US6022419 Hydrolysis and fractionation of lignocellulosic biomass |
| 02/03/2000 | WO2000005310A1 Cellulose fiber based compositions and film |
| 01/25/2000 | US6017415 Feeding waste paper/paperboard products made of cellulosic in non-pulp form, wood chips and cooking solution into a digester, cooking under pressure to form pulp, discharging cooking solution and pulp from digester, washing the solution |
| 01/20/2000 | WO2000003083A1 A process for concentrating soluble and colloidal substances in process waters |