| Patents for D21C 3 - Pulping cellulose-containing materials (5,020) |
|---|
| 12/04/1990 | CA1277110C Method for cooking control of lignocelluloses by ftir spectroscopy |
| 11/20/1990 | US4971658 Method of intensifying the washing of a fiber suspension |
| 11/20/1990 | US4971657 Combined process for thermally and chemically treating lignocellulose-containing biomass and for producing furfural and cellulose-containing fiber masses |
| 11/13/1990 | CA1276067C Method for molding 1,4,4a,9a-tetrahydroanthraquinone |
| 11/06/1990 | CA1275760C Method of manufacturing bleached chemimechanical and semichemical fibre pulp by means of a two-stage impregnation process |
| 11/06/1990 | CA1275758C Method for controlling alkaline pulping process |
| 10/30/1990 | US4966650 Solvent extraction |
| 10/27/1990 | CA2015538A1 Process and device for continuous cooking of cellulose |
| 10/16/1990 | CA1275286C Method for extracting the chemical components from dissociated lignocellulosic material |
| 09/28/1990 | WO1990011401A1 Improved method of producing pulp |
| 09/18/1990 | US4957599 Alkaline extraction, peroxide bleaching of nonwoody lignocellulosic substrates |
| 09/04/1990 | CA1273454A1 Process for the manufacture of cellulose pulps and cellulose pulps obtained thereby |
| 08/28/1990 | US4952277 Process for producing kraft pulp for paper using nonionic surface active agents to improve pulp yield |
| 08/23/1990 | DE3905311A1 Anthraquinone/surfactant mixtures, production and use thereof |
| 08/15/1990 | CN1044686A Manufacturing method of liner boards for leather cases by use of mao bamboos (or mu bamboos, sundry bamboos) and accompanied with waste papers, aristate stems, wheatgrasses, rice straws |
| 08/15/1990 | CN1044661A Separating method of vegetable cellulose and non-cellulose |
| 08/08/1990 | CN1009119B Pure flax tissue paper for making fuse |
| 08/07/1990 | US4946946 Acidification and agitation of solution; precipitation |
| 08/07/1990 | CA1272354A1 Methods for producing low fines content pulp |
| 07/31/1990 | US4944841 Procedure for controlling alkaline pulping processes |
| 07/20/1990 | WO1990008221A1 A method in the manufacture of cellulose pulp |
| 07/20/1990 | CA2045497A1 Method in the manufacture of cellulose pulp |
| 07/17/1990 | US4941944 Production of lignin and sugars by cooking, comminution |
| 06/27/1990 | EP0374700A2 Process for preparing mechanical pulp and for paper containing said pulp |
| 06/27/1990 | EP0056409B1 Pulping of lignocellulose with aqueous alcohol and alkaline earth metal salt catalyst |
| 06/19/1990 | US4935366 Method of obtaining cellulase deficient strains of white-rot fungi |
| 06/13/1990 | EP0250422B1 Process for preparing bleached pulp from lignocellulosic raw material |
| 06/13/1990 | CN1042958A Manufacturing technique of a medium-grade toilet paper made entirely from wheat straw |
| 06/05/1990 | CA1269806A1 Method of enhancing the cooking of wood chips for pulp production |
| 05/29/1990 | CA1269502A1 Mixing oxygen gas with medium consistency pulp in a pump discharge |
| 05/23/1990 | CN1042388A Process and apparatus for manufacture of plup for paper, board, fiberboard and similar products |
| 05/08/1990 | CA1268760A1 Method for producing cellulose triacetate from mercerized or unmercerized bleached cellulose produced from dissociated lignocellulosic material |
| 05/08/1990 | CA1268605A1 Method of controlling alkaline pulping by means of a rapid analyzer measuring organic and inorganic cooking liquor components |
| 04/25/1990 | EP0364632A1 Production of lignin |
| 04/25/1990 | CA2001188A1 Multiple charge chlorine bleaching to reduce formation of chlorinated dioxins and furans |
| 04/18/1990 | CN1041413A Semi-chemical wood pulp from shrub mechanical mill and pulping process thereof |
| 04/17/1990 | CA1267859A1 Method of obtaining cellulase deficient strains of white-rot fungi |
| 04/10/1990 | US4916242 Combined process for thermally and chemically treating lignocellulose-containing biomass and for producing furfural |
| 03/22/1990 | WO1990002836A1 Supercritical delignification of wood |
| 03/22/1990 | WO1990002835A1 Method of making chemi-mechanical pulp from hardwood |
| 03/14/1990 | CN1040408A Process of pulping and papermaking using false indigo stem as raw material |
| 03/13/1990 | US4908098 Method for extracting the chemical components from dissociated lignocellulosic material |
| 03/06/1990 | US4906331 Method of enhancing the cooking of wood chips for pulp production |
| 02/27/1990 | US4904342 Process for pulping lignocellulose-containing material |
| 02/22/1990 | DE3927183A1 Controlling alkali digestion of cellulosic material - by determining volatile acid concn. ratio in liquor |
| 02/13/1990 | US4900399 Method of manufacturing bleached chemi-mechanical and semichemical fibre pulp by a two-stage impregnation process |
| 02/07/1990 | CN1039458A Method for separating short cotton fibres from cottenseed shells |
| 01/30/1990 | US4897155 Method for producing low fines content pulp by subjecting cellulosic chips to low frequency compression-relaxation cycles |
| 01/23/1990 | US4895619 Method of delignification of cellulosic fiber material |
| 01/23/1990 | US4895618 Method of controlling alkaline pulping process |
| 01/17/1990 | EP0351330A1 Process for manufacturing bleached chemithermomechanical pulps |
| 01/16/1990 | CA1264403A1 Process for preparing cellulose pulp from lignocellulosic material while removing high molecular weight substances from the pulping liquor |
| 01/09/1990 | US4892941 Porphyrins |
| 12/28/1989 | WO1989012716A1 Process and apparatus for the manufacture of pulp for paper, board, fiberboard and similar products |
| 12/26/1989 | US4889591 Crotalaria juncea paper pulps |
| 12/20/1989 | EP0346836A2 Process and apparatus for the continuous production of 2-furaldehyde, cellulose and lignine from lignocellulosic materials |
| 12/12/1989 | US4886577 Method and apparatus for mixing oxygen gas with medium consistency pulp in a pump discharge |
| 12/06/1989 | EP0344462A1 Continuous cooking pulp quality enhancements |
| 11/29/1989 | CN1037559A Method for producing double gummed paper with full-reed pulp |
| 10/31/1989 | CA1262503A1 Process of making cellulose pulp |
| 10/19/1989 | WO1989009547A1 Delignification of non-woody biomass |
| 10/18/1989 | EP0337653A2 Improved alkaline peroxide treatment of nonwoody lignocellulosic substrates |
| 10/04/1989 | EP0335242A2 Process and preservative for fodder preservation |
| 10/04/1989 | CN1036058A Medium-dense milling method for making cotton stalk pulp and pulp with other mixed materials |
| 09/26/1989 | US4869783 High-yield chemical pulping |
| 09/13/1989 | EP0097716B1 High bulk pulp, filter media utilizing such pulp, related processes |
| 08/22/1989 | US4859283 Delignification, bleaching to form edible materials |
| 08/22/1989 | US4859282 Acidification with aqueous mineral or organic acid |
| 08/16/1989 | EP0327576A1 Process for producing cellulose from lignin-containing raw materials. |
| 08/15/1989 | US4857145 Process for making a pulp from bamboo |
| 08/09/1989 | CN1034595A Improved nscmp pulping process |
| 08/02/1989 | EP0325891A1 Process for obtaining bleached cellulose pulp |
| 08/02/1989 | CN2042087U High-efficiency straw-pulp machine |
| 08/01/1989 | US4853084 Method for controlling alkaline pulping process |
| 08/01/1989 | US4853082 Process for the activation and delignification of cellulose pulp |
| 07/25/1989 | US4851082 Pulping process |
| 07/18/1989 | US4849052 Batch digester multi-stage pulping process |
| 06/27/1989 | US4842877 Chelation; extrusion with hydrogen peroxide and alkali |
| 06/27/1989 | US4842689 Method for controlling sulphite pulping and hydrolytic processes by means of rapid furfural analyzer |
| 06/20/1989 | CA1255948A1 Batch digester multi-stage pulping process |
| 06/14/1989 | EP0136325B1 Method for treating lignocellulose materials to obtain cellulose |
| 06/06/1989 | USRE32943 Solubilizing, stabilizing |
| 06/06/1989 | US4836893 Apparatus for treatment of fiber material |
| 06/06/1989 | CA1255058A1 Process for preparation of potassium salts from pulping of lignocellulosic materials |
| 06/06/1989 | CA1255057A1 Method of controlling sulphite pulping and hydrolytic processes by means of a rapid furfural analyzer |
| 05/24/1989 | CN1033085A No-alkaline and no-pollution process for making cotton pulp |
| 05/09/1989 | CA1253861A1 Process for the preparation of anthraquinone |
| 05/03/1989 | EP0313730A1 Apparatus and methods for reducing the formation of scale in pulping operations |
| 05/02/1989 | US4826568 Digestion of wood fragments to produce a paper pulp |
| 05/02/1989 | US4826567 Process for the delignification of cellulosic substances by pretreating with a complexing agent followed by hydrogen peroxide |
| 05/02/1989 | US4826566 Rapid disolution of lignin and other non-carbohydrates from ligno-cellulosic materials impregnated with a reaction product of triethyleneglycol and an organic acid |
| 04/05/1989 | EP0309998A2 A method in the activation of lignocellulosic material with a gas containing nitrogen dioxide |
| 03/14/1989 | US4812206 Process for bleaching lignocellulosic matter |
| 03/07/1989 | CA1250704A1 Pulping process |
| 03/07/1989 | CA1250702A1 System and process for sulfonating mechanical pulp fibers |
| 02/21/1989 | US4806475 Alkaline peroxide treatment of agricultural byproducts |
| 02/14/1989 | CA1249904A1 Oxygen alkali extraction of cellulosic pulp |
| 01/25/1989 | CN1030624A Bamboo as pulp making fiber |
| 01/24/1989 | US4799994 Process for cooking and bleaching pulp |
| 01/17/1989 | US4798651 Process for preparing pulp for paper making |