| Patents for D21C 11 - Regeneration of pulp liquors (4,054) |
|---|
| 07/08/1998 | CN1186779A New technology for treating waste water by lime causticization |
| 07/01/1998 | EP0850415A1 Determination of sodium sulfide and sulfidity in green liquors and smelt solutions |
| 06/30/1998 | US5773590 Acidification; cooking; separation using adjuvant |
| 06/30/1998 | US5771817 Recovery boiler |
| 06/25/1998 | WO1998027384A1 Method in a boiler, particularly a chemical recovery boiler |
| 06/25/1998 | WO1998016682A3 Process for the co-production of dissolving-grade pulp and xylan |
| 06/24/1998 | EP0848635A1 Liquid distributor for evaporator |
| 06/18/1998 | WO1998025853A1 Process for preparing calcium carbonate |
| 06/18/1998 | WO1998025852A1 Process for preparing calcium carbonate |
| 06/17/1998 | CN1184785A Method and equipment for quickly treating waste water for paper mill |
| 06/09/1998 | US5762758 Method of papermaking having zero liquid discharge |
| 06/04/1998 | WO1998023360A1 Treating methanol-containing waste gas streams |
| 06/04/1998 | CA2271723A1 Treating methanol-containing waste gas streams |
| 06/03/1998 | EP0844982A1 Method for oxidation of waste liquors containing organic matter |
| 06/03/1998 | EP0678130B1 Method for reburning of lime sludge in fluidised bed |
| 06/02/1998 | US5759345 Process for treating sulphur-containing spent liquor using multi-stage carbonization |
| 05/27/1998 | EP0843757A1 Method for reprocessing an ozone-containing gas present in a pulp bleaching plant |
| 05/22/1998 | WO1998021401A1 Segmented smelt spout |
| 05/20/1998 | EP0842125A1 Process for treating a surplus activated sludge |
| 05/20/1998 | CN1182149A Disposal method of papermaking black liquor |
| 05/19/1998 | US5752994 Black liquor gasifier |
| 05/15/1998 | CA2190443A1 Segmented smelt spout |
| 05/13/1998 | CN1181437A Method for burning siliceous spent liquor |
| 05/13/1998 | CN1181436A Alkali reclaiming method of using flue-gas acidized black liquid |
| 05/07/1998 | WO1998019003A1 Process for purifying ash which principally consists of sodium sulphate from a recovery boiler |
| 05/06/1998 | EP0839949A1 Method and arrangement for increasing evaporation capacity of a multi-stage evaporator of spent liquor in a pulp mill |
| 05/06/1998 | CN1180768A 一种草类纤维原料的“化学－机械”制浆系统 Kind of grass fiber raw materials, "Chemistry - Mechanical" pulping system |
| 05/05/1998 | US5746886 Method for the recovery of energy and chemicals from cellulose spent liquor containing potassium using a gasifier |
| 04/30/1998 | WO1998017857A1 Removal of metals from treatment fluids in a cellulose pulp mill |
| 04/29/1998 | EP0687247B1 Process for electrochemical treatment of cellulose waste lye |
| 04/23/1998 | WO1998016685A1 Falling-film evaporator with horizontal tubes for evaporating waste liquid from pulp production |
| 04/23/1998 | WO1998016684A1 Evaporation apparatus for evaporation of liquids, such as spent liquor from pulp cooking |
| 04/23/1998 | WO1998016682A2 Process for the co-production of dissolving-grade pulp and xylan |
| 04/23/1998 | CA2267985A1 Process for the co-production of dissolving-grade pulp and xylan |
| 04/21/1998 | US5741398 Heating at alkalinine ph |
| 04/21/1998 | US5740745 Process for increasing the effectiveness of slag control chemicals for black liquor recovery and other combustion units |
| 04/15/1998 | EP0835341A1 Method for producing polysulfides by electrolytic oxidation |
| 04/14/1998 | US5738758 Process for the conversion of calcium sulfide |
| 04/14/1998 | CA1339809C Oxidation of white liquor the presence of lime mud |
| 04/09/1998 | WO1998014657A1 Oxidation of disturbing metal ions in bleaching processes |
| 04/07/1998 | US5735331 Heat exchanging by expanding the green liquor to cool, circulating |
| 03/26/1998 | WO1998012473A1 Process for increasing the effectiveness of slag control chemicals for black liquor recovery and other combustion units |
| 03/26/1998 | WO1998012378A1 Method for reducing emissions of detrimental nitrogen compounds |
| 03/26/1998 | WO1998012143A1 Process for cleaning wastewater and recirculating water in paper production, de-inking and bleaching of pulp |
| 03/26/1998 | DE19638594A1 Verfahren zur Reinigung von Abwässern und Kreislaufwässern bei der Papierherstellung, dem Deinking und der Zellstoffbleiche A process for the purification of waste waters and circulation waters in papermaking, the deinking and pulp bleaching |
| 03/26/1998 | CA2266492A1 Method for reducing emissions of detrimental nitrogen compounds |
| 03/25/1998 | EP0831170A2 Improved process for recycling bleach plant filtrate |
| 03/24/1998 | US5730877 Method for fractionating a solution |
| 03/24/1998 | US5730838 Process for extracting pure, coarse grain silicic acid crystals from spent lye |
| 03/24/1998 | US5730837 Method of separating lignocellulosic material into lignin, cellulose and dissolved sugars |
| 03/12/1998 | WO1998010137A1 Process and apparatus for controlling the efficiency of causticizing process |
| 03/10/1998 | US5725748 Process and installation for treating cellulose waste lye |
| 03/10/1998 | US5724895 Device for distribution of oxygen-containing gas in a furnace |
| 03/04/1998 | EP0720676A4 Improved method for bleaching lignocellulosic pulp |
| 03/04/1998 | EP0670000B1 Method for acidification of soap with sodium bisulphite solution |
| 03/04/1998 | CN1175294A Method to reduce silicon, phosphor and aluminium contents in green liquor |
| 03/04/1998 | CN1174913A Method for purifying black liquor in paper making and natural resource utilization |
| 03/04/1998 | CN1174818A No sewage discharge treatinent method for black liquor in paper making |
| 02/25/1998 | CN1174268A Treatment and recovery process of black liquor in papermaking mill |
| 02/17/1998 | US5718810 Methanol recovery using extractive distillation |
| 02/10/1998 | US5716496 Method and apparatus for treatment of black liquor |
| 02/10/1998 | US5715763 Combustion system for a black liquor recovery boiler |
| 02/04/1998 | EP0822288A2 Continuous digester for the implementaion of dissolved solids profiling |
| 02/04/1998 | EP0821611A1 Falling-film evaporator for spent liquor from chemical pulping, and process for manufacturing tube lamellae in the evaporator |
| 01/28/1998 | EP0820545A2 Process and apparatus for removing low concentration, high-volume non-condensable gases produced in a kraft pulping process |
| 01/22/1998 | WO1998002692A1 Method for eliminating toxic organic substances |
| 01/22/1998 | DE19729710A1 Evaporator for sugar-, starch- and paper industry solutions, comprising stacked heat exchange modules |
| 01/21/1998 | EP0672208B1 Method of bleaching pulp without using chlorine-containing chemicals |
| 01/21/1998 | EP0599917B1 Production of alkali metal hydroxide and regeneration of pulp liquors |
| 01/21/1998 | CN1170795A Batch process for preparing improved kraft pulp |
| 01/14/1998 | EP0593743B1 Production of cellulose by the soda-anthraquinone process (sap) with recovery of the boiling chemicals |
| 01/13/1998 | US5707490 Method of recovering energy from waste liquors from pulp processes |
| 01/07/1998 | EP0815316A1 High solids black liquor of reduced viscosity and viscosity reduction method for high solids black liquor |
| 01/07/1998 | EP0746650A4 Pulping of fibrous plant materials and recovery of resultant by-products |
| 01/07/1998 | CN2272026Y Double-screen filter-press multi-roller furnisher |
| 01/07/1998 | CN1169761A Process for washing gas formed by gasifying black liquor |
| 01/06/1998 | US5705032 Black liquor viscosity control |
| 01/06/1998 | US5705031 Clarification, filtration, dilution, caking |
| 01/05/1998 | CA2209583A1 Method and arrangement for treatment of black liquor |
| 12/30/1997 | US5702570 Process of producing sodium hydroxide from sodium sulphate in a pulp mill |
| 12/30/1997 | US5701829 Apparatus for recovering heat in a spent liquor recovery boiler |
| 12/30/1997 | CA2130087C Method and apparatus for improving the safety of a spent liquor recovery boiler |
| 12/23/1997 | US5700350 Processes of retaining chelant-containing effluent within pulp bleach plants |
| 12/23/1997 | CA2122893C Chemical recovery from kraft black liquor |
| 12/23/1997 | CA2117973C Non-baffled low pressure drop vacuum cooled inserted smelt spout |
| 12/18/1997 | WO1997047935A1 Heat exchanger |
| 12/18/1997 | CA2257207A1 Heat exchanger |
| 12/17/1997 | CN1167853A Patash-black liquor recovery pulping method |
| 12/10/1997 | EP0811090A1 Black liquor viscosity control |
| 12/09/1997 | CA2041536C Method for treatment and recycling of pulp mill bleach plant effluents |
| 12/03/1997 | EP0810321A1 Batch process for preparing improved kraft pulp |
| 12/02/1997 | US5693256 Consists of water insoluble liquids selected from mineral oil, vegetable oil and fatty acid ester; hydrophobic filler selected from silica, titania, ground quartz, silicon resin, waxes, ethylenealkylamide; polysiloxane and polysilicate |
| 12/02/1997 | US5693184 Reduction of salt scale precipitation by control of process stream pH and salt concentration |
| 12/02/1997 | CA2005982C Process for the prevention of scale formation in wood pulp production |
| 11/26/1997 | EP0692044A4 Method for reusing spent gas from an ozone bleaching reactor |
| 11/13/1997 | WO1997042372A1 Method and apparatus for making polysulfides by oxidizing sulfides |
| 11/13/1997 | WO1997042371A1 Method and plant for separating soap from black liquor |
| 11/06/1997 | WO1997041295A1 Method for producing polysulfides by electrolytic oxidation |
| 11/06/1997 | WO1997041294A1 Hydrogen sulphide pretreatment of lignocellulosic material in continuous pulping processes |
| 11/05/1997 | CN1163959A Non-pollution treatment and comprehensive utilization of paper pulp digesting black liquor using alkaline process and sulphate process |