| Patents for D21C 11 - Regeneration of pulp liquors (4,054) |
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| 10/01/2003 | CN2576313Y Upper-floating-matter filtering apparatus for black liquid from paper making |
| 09/30/2003 | US6627170 Process for preparing calcium carbonate |
| 09/24/2003 | EP1345684A1 Improvements to oxidising processes by oxygen transfer within a liquid medium in a reactor under pressure |
| 09/12/2003 | WO2003074781A1 Process for producing furfural, formic acid and acetic acid from spent pulp-cooking liquor |
| 09/10/2003 | CN2571821Y Multi-function black liquor treating device for paper making |
| 09/10/2003 | CN1441117A Technological process of recovering white clay to produce stuffing calcium carbonate |
| 09/04/2003 | US20030164227 Method for improved turpentine recovery from modern cooking plants |
| 08/27/2003 | EP1337315A2 Method for the treatment of waste gas from a cellulose plant |
| 08/27/2003 | CN1438385A Waste-liquid treatment method for straw pulp paper-making |
| 08/26/2003 | CA2217694C Heat recovery from spent digester cooking liquor |
| 08/21/2003 | US20030157017 Polysulfide measurement methods using colormetric techniques |
| 08/20/2003 | CN1436895A Comprehensive utilization method of pulping potash black liquor in paper-making process |
| 08/20/2003 | CN1436894A Improved alkali recovering process from paper-making black liquor |
| 08/19/2003 | CA2277833C A process for the separation of sulphides from pulping liquors using amphoteric resins |
| 08/14/2003 | WO2003066961A1 A process of recovering alkali from black liquor of papermaking |
| 08/13/2003 | CN1435530A Method for extracting papermaking black liquor |
| 08/07/2003 | US20030145961 Process for recovering organic acids from bleaching liquors |
| 08/06/2003 | CN1117189C Process for recovering alkali and energy from black liquor containing silicate |
| 07/31/2003 | WO2003062524A1 Cooking of cellulose pulp in a cooking liquor containing pre-evaporated black liquor |
| 07/30/2003 | EP1330572A1 A cooking process using hot black liquor |
| 07/30/2003 | CN1116476C Method of reducing chlorion, potassium and other method ions in paper pulp and chemicals recovering system |
| 07/30/2003 | CN1116475C Method for bleaching waste water of making paper |
| 07/23/2003 | CN1115435C Acidifying sulfate pulp-making process |
| 07/17/2003 | WO2003057980A1 Polysulfide measurement methods using colorimetric techniques |
| 07/17/2003 | CA2473507A1 Polysulfide measurement methods using colorimetric techniques |
| 07/16/2003 | CN1114731C Papermaking pulp-liquor separating technology and diffusion washing single net vacuum filter press thereof |
| 07/10/2003 | US20030127030 Method and apparatus for sodium recovery in a semi-chemical pulping operation |
| 07/09/2003 | CN1114011C Alkaline pulping process of wheat straw without drainage of black liquid |
| 07/09/2003 | CN1114010C Alkali recovery process for black paper-making liquid of grass pulp |
| 07/09/2003 | CN1114009C Method for closed circulation treating waste water, waste gas in papermaking plant |
| 07/01/2003 | US6585880 Method for recovering chemicals in a process of producing pulp by kraft process |
| 06/27/2003 | CA2415239A1 Method and apparatus for sodium recovery in a semi-chemical pulping operation |
| 06/26/2003 | US20030116290 Continuous process for controlled evaporation of black liquor |
| 06/25/2003 | EP0844982B1 Method for oxidation of waste liquors containing organic matter |
| 06/18/2003 | EP1319103A1 Process for recovering organic acids from bleaching liquors |
| 06/18/2003 | CN1425090A Method for obtaining/recuperating by extraction carboxylic acids from waste liquors derived from pulp production |
| 06/17/2003 | US6578529 Arrangement for feeding black liquor into a recovery boiler |
| 06/11/2003 | CN1423012A Pulp-making method of raising fiber-recovering quality |
| 06/10/2003 | CA2098289C Distillation apparatus |
| 06/04/2003 | EP1005586B1 Method for the recovery of formic acid |
| 06/04/2003 | CN1110452C Method for recovering, treating and closed-loop circulating waste water of papermaking |
| 05/28/2003 | CN1420230A Alkali revovery by enriching sodium salt oxygen-controlled combustion method |
| 05/27/2003 | CA2074347C Method for controlling the sodium carbonate concentration of green liquor in the dissolving tank |
| 05/22/2003 | WO2003042452A1 System for controlling the flow pattern of a recovery boiler |
| 05/22/2003 | CA2467101A1 System for controlling the flow pattern of a recovery boiler |
| 05/21/2003 | CN1109160C Batch process for preparing improved kraft pulp |
| 05/21/2003 | CN1109157C Method for preparing alkaline solutions contg. aromatic polymer |
| 05/20/2003 | CA2072479C Batch process for preparing kraft pulp |
| 05/15/2003 | US20030089473 Bleaching pulp |
| 05/14/2003 | CN1108412C Method of separating impurities from lime and lime sludge and method of causticizing green liquor containing impurities, such as silicon in two stages |
| 05/07/2003 | EP1308555A2 Dissolved solids control in pulp production |
| 05/07/2003 | EP1308554A2 Dissolved solids control in pulp production |
| 05/07/2003 | CN1107763C Process and equipment for cyclically treating paper-making sawage by chemical and physical synchronization method |
| 04/30/2003 | CN2547757Y Papermaking black liquor thickening apparatus |
| 04/23/2003 | EP1304412A2 Process for bleaching lignocellulosic pulp |
| 04/17/2003 | WO2003031545A1 Brine separation in tall soap oil preparation |
| 04/17/2003 | WO2003031348A2 Process for recovering and recycling compounds contained in effluents of delignification and bleaching processes in pulp mills |
| 04/17/2003 | US20030070627 Direct contact evaporator replacement |
| 04/16/2003 | EP1302529A1 Brine separation in tall soap oil preparation |
| 04/16/2003 | EP0698139B1 Dissolved solids control in pulp production |
| 04/16/2003 | CN1105688C Biological acid process for separating lignin from alkaline papermaking black liquor |
| 04/10/2003 | WO2002059417A3 Heat treatment of polysulphide containing white liquors |
| 04/09/2003 | CN1408945A Process for treating waste water of paper-making |
| 04/09/2003 | CN1408944A Process for treating waste water of paper-making |
| 04/08/2003 | CA2253856C Method and plant for separating soap from black liquor |
| 04/03/2003 | WO2003027384A1 Method for recovery of pulping chemicals in an alkaline sulphite pulping process and for production of steam |
| 04/02/2003 | CN1104524C Dissovlved solids control in pulp production |
| 04/01/2003 | US6540871 Shredding to reduce the size of by-product solid clumps from a pulping process; the material can be reused again in papermaking process; capable of being burned to provide heat that can be used in another process |
| 03/27/2003 | US20030059362 Slaking a quick lime containing calcium carbonate at a specific level with a white liquor to prepare a milk of lime or soda pulp to continuously add a green liquor |
| 03/27/2003 | US20030056910 Method to lower the release of hazardous air pollutants from kraft recovery process |
| 03/26/2003 | CN1103619C Scale preventing method for the concentration process of solution of liquid mixture |
| 03/20/2003 | US20030053946 Kraft waste reclamation and methodology |
| 03/13/2003 | US20030049194 Method for producing calcium carbonate |
| 03/12/2003 | EP1290272A1 Thermal conversion of biomass to valuable fuels, chemical feedstocks and chemicals |
| 02/27/2003 | WO2003016616A1 Process for leaching electrical filter ash from a recovery boiler |
| 02/27/2003 | US20030037892 Preparation of chemical pulp and xylose, utilizing a direct acid hydrolysis on the pulp |
| 02/25/2003 | US6524436 Flash tank steam economy improvement |
| 02/25/2003 | CA2126444C Separating arrangement and method for counteracting foam formation |
| 02/20/2003 | WO2003014467A2 Production of pulp from cellulosic fibrous raw materials and recovery of chemicals and energy from pulp liquors |
| 02/20/2003 | CA2455187A1 Paper plant - method and apparatus for producing pulp from cellulosic fibrous raw materials and recovering chemicals and energy from pulp liquors |
| 02/19/2003 | CN2536637Y Papermaking black liquid full recovery devices |
| 02/19/2003 | CN1397684A Process for treating and reclaiming black paper-making liquid generated by alkali pulping |
| 02/11/2003 | US6517793 Ammonia in the odor gases is separated before combustion and reacts with nitrogen oxides forming water and nitrogen; pulp mill |
| 02/11/2003 | US6517699 Method for producing polysulfides by means of electrolytic oxidation |
| 02/06/2003 | US20030024806 Plasma whirl reactor apparatus and methods of use |
| 02/05/2003 | EP1144757B1 A method of cleaning sulfide contaminated condensates |
| 02/05/2003 | CN1395639A Bleaching pulp |
| 02/05/2003 | CN1395543A Method for producing calcium carbonate |
| 02/05/2003 | CN1100915C Method for recovery of formic acid |
| 02/04/2003 | US6514379 Procedure for arranging water circulations in integrated paper mill |
| 01/30/2003 | US20030019594 Grass fiber pulp has lighter color than the pulp produced from woods, only need a smaller amount of chemical bleach be added to bleach the pulp to a desired whiteness; papermaking; high strength fibers |
| 01/30/2003 | US20030019593 Improving the process efficiency by filtering the by-products from liquor or filtrate stream; purification; papermaking |
| 01/22/2003 | CN1392911A Process for recovering organic acid from bleaching liquors |
| 01/22/2003 | CN1391968A Waste steam recovering and utilziing method for atmospheric evaporation in imine puling process |
| 01/16/2003 | US20030010265 Arrangement for cleaning, airflow control and pushing away melt in air ports of incineration boilers |
| 01/14/2003 | CA2220325C Recovery boiler |
| 01/08/2003 | CN2529896Y Residual liquid reclaiming appts. for pulping by alcohol process |
| 01/07/2003 | US6503369 Process for producing cellulose and fertilizer by-product |
| 01/02/2003 | EP1268925A1 Method for improved turpentine recovery from modern cooking plants |
| 12/31/2002 | US6500301 Apparatus for gasification of spent liquor |