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Class Information
Number: 162/35
Name: Paper making and fiber liberation > Processes of chemical liberation, recovery or purification of natural cellulose or fibrous material > With regeneration, reclamation, reuse, recycling or destruction of digestion fluid > With destruction of organic ingredient in or smelting of liquor > Residue converted into liquor different from original liquor
Description: Processes in which waste liquor is subjected to a destruction of contained organic material or is smelted and subsequently the residue is reconstituted into a cellulose liberation liquor which is chemically different than that originally employed for treating the fibrous material.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7553394 |
Method for removing potassium from ash produced in a kraft pulping process recovery boiler using a Na-type cation exchange organic resin |
Jun. 30, 2009 |
| 7291245 |
Process for causticizing green liquor in chemical recovery from black liquor in alkaline pulping |
Nov. 6, 2007 |
| 5938892 |
Process for recycling bleach plant filtrate |
Aug. 17, 1999 |
| 5853535 |
Process for manufacturing bleached pulp including recycling |
Dec. 29, 1998 |
| 5738758 |
Process for the conversion of calcium sulfide |
Apr. 14, 1998 |
| 5667633 |
Method of producing white liquor streams of high and low sulphidity |
Sep. 16, 1997 |
| 5582683 |
Method for the recovery of chemical values from black liquor in multiple streams of different chemical values |
Dec. 10, 1996 |
| 5507912 |
Kraft pulping process wherein sulphide-rich and sulphide-lean white liquors are generated |
Apr. 16, 1996 |
| 4762590 |
Causticizing process |
Aug. 9, 1988 |
| 4728393 |
Methods for obtaining deicers from black liquor |
Mar. 1, 1988 |
| 4508593 |
Process for recovery of sulfur dioxide liberated in the chemical pulping of lignocellulosic material |
Apr. 2, 1985 |
| 4507172 |
Kraft pulping process |
Mar. 26, 1985 |
| 4481072 |
Method for recovery of wastewater residues |
Nov. 6, 1984 |
| 4388197 |
Procedure for separating finely divided matter from a suspension by filtering |
Jun. 14, 1983 |
| 4347102 |
Elimination of potassium compounds from sodium-based pulped cycles |
Aug. 31, 1982 |
| 4334956 |
Method of reutilizing kraft spent liquor |
Jun. 15, 1982 |
| 4153502 |
Process for the production of polysulphide pulping liquor from pulp mill recovery smelt |
May. 8, 1979 |
| 4113553 |
Sodium sulfide pulping with hydrogen sulfide generation |
Sep. 12, 1978 |
| 4098639 |
Process for reducing the requirement of fresh chemicals without increasing emissions in the pulping of cellulosic material |
Jul. 4, 1978 |
| 4073678 |
High yield semichemical wood pulping process |
Feb. 14, 1978 |
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