| Patents for D21C 11 - Regeneration of pulp liquors (4,054) |
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| 03/31/2005 | US20050067120 refining crude soybean oils, then oligomerization, mixing the soybean oil oligomer with surfactants to form an emulsion andmixing the emulsion with recycled paper pulp to improve absorbent product properties |
| 03/30/2005 | CN1195119C Method for extracting papermaking black liquor |
| 03/30/2005 | CN1194903C Microfiltration film separation technology for straw pulp balck liquor |
| 03/30/2005 | CN1194902C Microfiltration film separation and reuse technology for papermaking intermediate waste water |
| 03/24/2005 | US20050061457 Process for preparing purified fractions of hemicellulose and cellulose-hemicellulose complexes from alkali treated fiber and products made by the process |
| 03/24/2005 | US20050061217 System for controlling the flow pattern of a recovery boiler |
| 03/23/2005 | CN1598130A Technology for mfg, high whiteness paper making filling light calcium carbonate recovered from lime mud |
| 03/22/2005 | CA2222661C Implementation of dissolved solids profiling |
| 03/22/2005 | CA2171748C Preparation of cooking liquor containing sulphite |
| 03/17/2005 | WO2005024125A1 Chemimechanical desilication of nonwood plant materials |
| 03/15/2005 | US6866748 Process for preparing polysulfides using clarified white liquor |
| 03/15/2005 | CA2159856C Method of reducing scaling of heat transfer surfaces in an evaporation plant of a sulphate cellulose mill |
| 03/10/2005 | US20050051287 Chemimechanical desilication of nonwood plant materials |
| 03/08/2005 | CA2224824C Method for producing polysulfides by electrolytic oxidation |
| 03/03/2005 | WO2005019526A2 System and method for controlling a processor including a digester utilizing time-based assessments |
| 03/03/2005 | US20050045291 Without using oxygen or other pressurized gas; maintaining brightness; reducing pollutant content of waste water |
| 03/02/2005 | CN1587508A Method for producing light calcium carbonate product with white mud |
| 03/02/2005 | CN1587507A Acid separated filtrate treating method for paper-making black liquor |
| 03/02/2005 | CN1587501A Method for producing pulp by potassium containing compound as steaming preparation with cellulose containing raw material |
| 02/23/2005 | EP0734469B1 Implementation of dissolved solids profiling |
| 02/23/2005 | CN1583573A Nanometer titanium dioxide colloid microparticle flow aiding filter aid and preparing method thereof |
| 02/17/2005 | US20050034824 System and method for controlling a processor including a digester utilizing time-based assessments |
| 02/16/2005 | CN1580388A Rice straw pulp lignin production process |
| 02/09/2005 | EP1504154A1 Method of producing energy at a pulp mill |
| 02/09/2005 | EP0991809B1 Process for treating spent, waste, alkaline digestion liquor from paper pulping operations and product |
| 02/08/2005 | CA2193516C Process for washing gas formed by gasifying black liquor |
| 01/19/2005 | CN1185035C Waste steam recovering and utilziing method for atmospheric evaporation in imine puling process |
| 01/18/2005 | CA2174447C A method for burning secondary sludge in a recovery boiler |
| 01/13/2005 | WO2005003449A1 Method of utilising unreacted carbon from black-liquor gasification |
| 01/12/2005 | CN2670417Y Defoaming apparatus of papermaking black liquor storage tank |
| 01/12/2005 | CN1563568A Zero discharge technique for treating waste fluid from paper mill by using subtraction method |
| 01/06/2005 | WO2004088033A3 Recycling of sulphur in a pulp production process |
| 01/05/2005 | EP0666831B1 Process associated with the gasification of cellulose spent liquors |
| 01/05/2005 | CN1182907C Strong expression blade type filter |
| 01/04/2005 | CA2144827C Method for adjusting the s/na ratio in a sulphate pulp mill |
| 12/30/2004 | US20040265205 Brine separation in tall soap oil preparation |
| 12/29/2004 | CN2666979Y Direct heat exchanging straw pulp paper-making black liquor alkali recovering equipment |
| 12/22/2004 | CN2665193Y Apparatus for producing cement additive from paper making black liquor modified lignin |
| 12/14/2004 | US6830696 Treatment of spent pulping liquor with lignin separation to recover alkali pulping chemicals in manufacture of paper pulp |
| 12/09/2004 | WO2004106624A1 Method for producing pulp and lignin |
| 12/09/2004 | US20040244925 Acid catalyst hydrolysis of wood chips; recyclization of catalyst |
| 12/08/2004 | CN1179089C Process for recovering organic acid from bleaching liquors |
| 12/07/2004 | US6827912 A pressure vessel where the gasification of fuel, residual and waste materials can be carried out in an entrained-bed type gasification reaction |
| 12/03/2004 | CA2452145A1 Method for producing pulp and lignin |
| 12/01/2004 | EP1482087A1 A process of recovering alkali from black liquor of papermaking |
| 12/01/2004 | EP1481124A1 Process for producing furfural, formic acid and acetic acid from spent pulp-cooking liquor |
| 11/30/2004 | US6824646 Utilizing a waste water delivered from an enzyme treatment step as a liquid medium of an alkali-oxygen bleaching step; hemicellulose treatment returned to a preceeding alkali-oxygen bleaching step, without deteriorating the bleaching |
| 11/25/2004 | WO2004088032A3 Method for recycling sulphur in a pulp production process |
| 11/23/2004 | US6821384 Producing industrial raw materials from filter accumulation of soda recovery unit in sulfate cellulose mill; leaving no disposable waste |
| 11/23/2004 | US6821382 Method and arrangement for cleaning contaminated condensate including a combined stripper/condenser |
| 11/17/2004 | CN1546789A Improved lime mud recovering process and its application for producing neutral glue blending paper |
| 11/11/2004 | US20040221779 System for feeding combustion air in a soda recovery boiler |
| 11/04/2004 | WO2004013409A9 Apparatus and method for treating black liquor |
| 11/04/2004 | US20040216854 Arundo donax composite panel |
| 11/03/2004 | CN1542218A Alkali recovery device for straw pulp papermaking black liquor |
| 11/03/2004 | CN1174144C Process for producing cellulose pulp and fertiliser containing potassium |
| 10/27/2004 | EP1470287A1 Cooking of cellulose pulp in a cooking liquor containing pre-evaporated black liquor |
| 10/27/2004 | CN1540093A Recovery unit for black liquor of paper making from straw pulp |
| 10/21/2004 | WO2004090225A1 Purification of alkaline washing liquid |
| 10/21/2004 | DE19729710B4 Vorrichtung zum Eindicken von Flüssigkeiten Apparatus for thickening liquids |
| 10/20/2004 | EP1468140A1 Polysulfide measurement methods using colorimetric techniques |
| 10/20/2004 | CN1538005A Low-cost black liquor treating and alkali recovery technology |
| 10/14/2004 | WO2004088033A2 Recycling of sulphur in a pulp production process |
| 10/14/2004 | WO2004088032A2 Method for recycling sulphur in a pulp production process |
| 10/07/2004 | US20040194900 Method for recovery of pulping chemicals in an alkaline sulphite pulping process and for production of steam |
| 10/05/2004 | US6799526 Methods of improving productivity of black liquor recovery boilers |
| 09/29/2004 | EP1462565A1 Method for producing a plant nutrition composition from a biopulp filtrate and a formulated plant nutrition so produced |
| 09/29/2004 | EP1337315B1 Method for the treatment of waste gas from a cellulose plant |
| 09/29/2004 | CN1532171A Formula and prepn process of plant nutrition liquid prepared by using plant fiber biological pulping recovery liquid |
| 09/22/2004 | EP1161592B1 Process for oxygen pulping of lignocellulosic material and recovery of pulping chemicals |
| 09/21/2004 | US6793809 Pipe system for receiving and transporting lime sludge from a white liquor filter |
| 09/21/2004 | CA2148856C Process for treating waste water effluent |
| 09/21/2004 | CA2116260C Method of inhibiting calcium oxalate scale deposition |
| 09/15/2004 | EP1456464A1 System for controlling the flow pattern of a recovery boiler |
| 09/15/2004 | EP1456135A2 Process for recovering and recycling compounds contained in effluents of the delignification and bleaching in pulp mills |
| 09/15/2004 | CN1528976A Cotton pulp black liquor treating method nad electrolysis apparatus thereof |
| 09/14/2004 | US6790313 Regenerative thermal oxidizer process and so2 scrubbing |
| 09/14/2004 | US6790246 Apparatus for gasification of spent liquor |
| 09/10/2004 | WO2004046456A8 Method and arrangement in making of mechanical pulp |
| 09/08/2004 | EP0668983B2 A furnace |
| 09/02/2004 | WO2004074415A1 Crude tall oil recovery in alkaline pulp mills |
| 09/02/2004 | US20040168785 Method for kraft waste reclamation |
| 08/25/2004 | EP1448845A2 Production of pulp from cellulosic fibrous raw materials and recovery of chemicals and energy from pulp liquors |
| 08/25/2004 | EP1109750B1 Process and product for the inhibition of scale in harsh systems |
| 08/25/2004 | CN1163407C Method for producing polysulfide by use of electrolytic oxidation |
| 08/24/2004 | US6780211 Understoichiometric; from chemical pulp production under centrifugal force; nozzle for combustion; separation; outlet is arranged concentrically |
| 08/24/2004 | CA2236479C Process for purifying condensate while evaporating waste liquors |
| 08/12/2004 | US20040154760 Extraction, crushing, splitting; multistage process; contorlling temperature |
| 08/11/2004 | EP1444395A1 Process for leaching electrical filter ash from a recovery boiler |
| 08/05/2004 | US20040149185 Combustion air system for recovery boilers, burning spent liquors from pulping processes |
| 08/04/2004 | EP1442107A1 Brine separation in tall soap oil preparation |
| 08/04/2004 | CN2630297Y Apparatus for treating papermaking waste water |
| 08/03/2004 | US6770168 Process for oxygen pulping of lignocellulosic material and recorvery of pulping chemicals |
| 07/22/2004 | WO2004038092A3 Systems and methods for generating polysulfides |
| 07/21/2004 | CN1514921A Combustion air system for recovery boilers, burning spent liquors from pulping process |
| 07/20/2004 | CA2120297C Evaporator operating on falling film principle |
| 07/15/2004 | US20040134794 oxidizing sodium sulfide in kraft cooking liquor; by-product inhibition |
| 07/14/2004 | CN1512006A Production and application of black liquid separating agent for straw pulp paper-making |
| 07/13/2004 | US6761799 Vapor generated during concentration used to preheat combustion air; evaporation |
| 07/13/2004 | US6761798 Method for forming an Arundo donax paper product |