| Patents for D21C 3 - Pulping cellulose-containing materials (5,020) |
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| 01/03/1989 | US4795604 Method for molding 1,4,4a,9a-tetrahydroanthraquinone |
| 12/27/1988 | US4793898 Predefibering lignocellulose with peroxy(formic or acetic)acid |
| 12/13/1988 | US4790905 Solid phase cooking |
| 12/06/1988 | US4789429 Method of making mechanical pulp |
| 11/30/1988 | EP0293309A1 Process for producing chemithermomechanical pulps |
| 11/29/1988 | US4787959 Process for preparing chemical paper pulps by cooking, intermediate grinding and a final alkaline peroxide delignification |
| 11/22/1988 | US4786365 Digesting wood |
| 11/17/1988 | EP0291495A2 Combined process for the thermal and chemical treatment of lignocellulose-containing biomasses and for the production of furfural |
| 11/17/1988 | EP0291494A2 Combined process for the thermal and chemical treatment of lignocellulose-containing biomasses and for the production of furfural |
| 11/16/1988 | CN88100989A Pulping process |
| 10/26/1988 | EP0287960A2 A process for the production of a hemicellulose hydrolysate and special pulp |
| 10/25/1988 | US4780182 Determining and comparing light absorption and consistency |
| 10/20/1988 | WO1988007988A1 Porphyrins, their syntheses and uses thereof |
| 10/19/1988 | CN88101244A Pure flax tissue paper for making fuse |
| 10/19/1988 | CN87101324A Pulpifying technology and its fabricative equipments for making high strength corrugated raw paper with cotton fagot by means of imine method |
| 10/04/1988 | CA1242552A1 Method of bringing a digester up to cooking temperature |
| 09/28/1988 | EP0284585A2 Improved process for preparing pulp for paper making |
| 09/28/1988 | EP0283589A1 Dietary fiber and method of making |
| 09/27/1988 | US4773966 Oxidative degradation of lignin with inorganic metal complexes |
| 09/20/1988 | CA1242191A1 Alkaline peroxide treatment of nonwoody lignocellulosics |
| 09/20/1988 | CA1242055A1 Sawdust pumping, and processing |
| 09/13/1988 | CA1241859A1 Chip presteaming and air washing |
| 08/30/1988 | US4767500 With blowing, washing and bleaching steps; alkaline sulfite, alcohol solvent, quinone redox catalyst |
| 08/23/1988 | CA1240813A1 Absorbent vegetable material and process for making same |
| 08/17/1988 | EP0128170B1 Primary battery system |
| 08/17/1988 | CN85107578B Technology of chemical machinery method of pulpmaking with reed to make paperplate |
| 08/16/1988 | US4764252 Process for pulping lignocellulosic material with a preoxidized alkaline sulfide pulping liquor containing a cyclic organic compound |
| 08/16/1988 | US4764251 Method for the impregnation and cooking of lignocellulosic material by a batch cooking using spent impregnation liquor from a previous batch |
| 08/16/1988 | CA1240456A1 Mechanical pulping |
| 08/10/1988 | CN87102581B Imine method of using whole bamboo pulp manufacturing kraft box board |
| 08/09/1988 | US4762591 Apparatus for reacting lignocellulosic material with a gas phase comprising a nitrogen oxide and oxygen under controlled gas pressure |
| 07/27/1988 | CN87101264A Chemically degummed mothod to remove wood element for cannabis with high efficiency |
| 07/13/1988 | EP0273915A1 Method of making mechanical pulp |
| 07/13/1988 | CN87101508B Urea process for making paper pulp |
| 07/06/1988 | EP0273759A2 Procedure for recirculating phenol in a lignocellulosic materials digestion process |
| 06/21/1988 | US4752357 Colorimetric analysis of sample |
| 06/14/1988 | US4750973 Process for reducing carbohydrate losses in the sulfate pulping of wood by pretreating the wood with oxygen and nitrogen oxides |
| 06/14/1988 | CA1237930A1 Continuous digester system |
| 05/24/1988 | US4746401 Process for extracting lignin from lignocellulosic material using an aqueous organic solvent and an acid neutralizing agent |
| 05/10/1988 | US4743339 Method for controlling the digestion of pulp by IR spectroscopy |
| 05/10/1988 | US4742814 Process for production of xylitol from lignocellulosic raw materials |
| 05/05/1988 | WO1988003190A1 Process for producing cellulose from lignin-containing raw materials |
| 05/05/1988 | DE3636208A1 Verfahren zur delignifizierung und bleichung von lignicellulosehaltigem bzw. ligninhaltigem material bzw. lignin durch enzymatische behandlung Process for the delignification and bleaching of lignocellulosic material or lignicellulosehaltigem or lignin by enzymatic treatment |
| 04/06/1988 | EP0263040A1 Process for bleaching lignocellulosic materials |
| 04/06/1988 | EP0262988A2 Manufacture of pulp |
| 04/06/1988 | CN87106132A Process of manufacturing papers for books and periodicals of offset printing |
| 04/05/1988 | US4735683 Process for preparation of potassium salts from pulp of lignocellulosic materials |
| 04/05/1988 | CA1234802A1 Process for producing wood pulp utilizing an s-triazine additive, and an improved wood pulp and paper containing an s-triazine |
| 03/29/1988 | US4734162 Hardwood pulp having a tactile sense of softness, and tissue paper webs thereof |
| 03/23/1988 | CN86105428A Low pallution method for preparation of cotton pulp under normal pressure |
| 02/16/1988 | CA1232785A1 Apparatus for treating lignocellulosic material with a gas phase |
| 02/03/1988 | CN85104046B Process for pulp making using grasses as raw materials |
| 01/12/1988 | US4718979 Method for rapid determination of the contents of lignin, monosaccharides and organic acids in the process solutions of sulfite pulping |
| 01/07/1988 | EP0250422A1 Process for preparing bleached pulp from lignocellulosic raw material. |
| 01/05/1988 | US4717672 Oxidation sensor |
| 01/05/1988 | US4717451 Process for the preparation of anthraquinone dispersions and their use in alkaline wood digestion processes |
| 12/22/1987 | CA1230592A1 Organosolv process for hydrolytic decomposition of lignocellulosic and starch materials |
| 12/15/1987 | CA1230208A1 Process for preparing pulp for paper making |
| 12/15/1987 | CA1230207A1 Method for the production of cellulose by the batch cooking process |
| 12/08/1987 | CA1230171A1 Device for monitoring black liquor oxidation |
| 12/03/1987 | WO1987007314A1 Procedure for prebleaching chemical cellulose pulps |
| 11/25/1987 | CN87104051A Improvement of the appearance and color of chinese yun nan pine sulfate pulp |
| 11/24/1987 | US4708771 Papermaking |
| 11/24/1987 | CA1229454A1 Aqueous solution containing sulphur dioxide and sodium in high percentages, its manufacture and use |
| 11/19/1987 | EP0245536A2 Method of controlling the degree of digestion of lignocellulose-containing materials |
| 11/19/1987 | EP0245238A1 Method for the separation of gases from the cooking liquor of cellulosic pulp |
| 11/19/1987 | DE3616051A1 Method of monitoring the digestion of lignocelluloses with the aid of FTIR spectroscopy |
| 11/18/1987 | CN87102581A Imine method of using whole bamboo pulp manufacturing kraft box board |
| 10/13/1987 | US4699691 Pulping; papermaking |
| 10/08/1987 | DE3641785A1 Process for producing pulp |
| 09/30/1987 | CN87101508A Urea process for making paper pulp |
| 09/15/1987 | CA1226705A1 Chemithermomechanical pulping process employing separate alkali and sulfite treatments |
| 09/01/1987 | US4690731 Delignification, lignocellulose, digestion, sulfite liquors, black liquor, multistage |
| 08/26/1987 | CN86102407A Fuzz fibres slurrying process for solving pollution |
| 08/25/1987 | US4689117 Thermomechanical digestion process for enhancing the brightness of cellulose pulp using bleachants |
| 08/18/1987 | CA1225636A1 Method for continuous countercurrent organosolv saccharification of wood and other lignocellulosic materials |
| 07/21/1987 | US4681935 Digestion, filtration, reverse osmosis, circulation |
| 06/24/1987 | EP0226227A2 Chip presteaming and air washing |
| 06/23/1987 | CA1223106A1 Control of active alkali in black liquor |
| 06/16/1987 | US4673460 Using ethoxylated alkylphenol, sulfonated fatty acid |
| 06/16/1987 | EP0225638A1 A method for delignification of pulp |
| 06/16/1987 | CA1222898A1 Process for continuous digestion of finely-divided material |
| 06/09/1987 | CA1222603A1 Polution free pulping process using recycled wash effluent from multiple bleach stages to remove black liquor and recovering sodium hydroxide from the black liquor |
| 06/03/1987 | EP0224470A1 Process for producing cellulose pulp from fibrous plant material |
| 06/02/1987 | US4670098 Delignification, separation |
| 05/21/1987 | WO1987003022A1 Method of making mechanical pulp |
| 05/07/1987 | WO1987002721A1 Method for the separation of gases from the cooking liquor of cellulosic pulp |
| 05/06/1987 | CN85107578A Technology of chemical machinery method of pulpmaking with reed to make paperplate |
| 04/28/1987 | CA1221183A1 Water-soluble or water-dispersible graft polymers, their preparation and their use |
| 03/31/1987 | CA1219733A1 Gaseous reaction apparatus and process |
| 03/24/1987 | US4652341 Accelerated lignin nitration process using aluminum compounds |
| 03/12/1987 | WO1987001402A1 Method for producing of cellulosic pulp |
| 03/11/1987 | EP0213376A1 Process for the delignification of cellulosic materials |
| 03/10/1987 | US4649113 Alkaline peroxide treatment of nonwoody lignocellulosics |
| 03/10/1987 | CA1218808A1 Nonsulphur chemimechanical pulping process |
| 03/04/1987 | EP0212329A1 Process for the delignification of cellulosic materials |
| 03/04/1987 | CN85106196A Utilize chinese alpine rush for making nitrocellulose |
| 02/25/1987 | EP0211558A2 Process for digesting lignocellulosic material |
| 02/25/1987 | CN86105219A Process for digesting lignocellulosic material |
| 02/25/1987 | CN86104368A Process for preparation of potassium salts from pulping of lignocellulosic materials |