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Class Information
Number: 162/36
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 > Sulfur dioxide or sulfite containing spent liquor
Description: Processes in which the waste liquor from a cellulose digestion with a sulfite or sulfur dioxide is subjected to smelting or the destruction of a contained organic material.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 6876300 |
Electronic intelligent turn signal control system |
Apr. 5, 2005 |
| 6821382 |
Method and arrangement for cleaning contaminated condensate including a combined stripper/condenser |
Nov. 23, 2004 |
| 6348129 |
Treatment of pulp mill condensate with ozone |
Feb. 19, 2002 |
| 5820830 |
Waste recovery and utilization in the kraft recovery process |
Oct. 13, 1998 |
| 5759345 |
Process for treating sulphur-containing spent liquor using multi-stage carbonization |
Jun. 2, 1998 |
| 5730877 |
Method for fractionating a solution |
Mar. 24, 1998 |
| 5701829 |
Apparatus for recovering heat in a spent liquor recovery boiler |
Dec. 30, 1997 |
| 5637225 |
Method for fractionating sulphite cooking liquor |
Jun. 10, 1997 |
| 5635027 |
Method of reducing the viscosity of a black liquor |
Jun. 3, 1997 |
| 5320757 |
Method of inhibiting calcium oxalate scale deposition |
Jun. 14, 1994 |
| 5096540 |
Method for recycling sulfur dioxide from sulfite pulping liquors |
Mar. 17, 1992 |
| 4971657 |
Combined process for thermally and chemically treating lignocellulose-containing biomass and for producing furfural and cellulose-containing fiber masses |
Nov. 20, 1990 |
| 4941946 |
Process for decreasing the tendency to form deposits in plants for evaporating spent sulfite liquors |
Jul. 17, 1990 |
| 4891097 |
Method for regulating, the feeding-in or combustion conditions of concentrated spent liquors |
Jan. 2, 1990 |
| 4767500 |
Sulfite cooking method for the production of cellulose from materials containing lignocellulose with recovery of the cooking chemicals |
Aug. 30, 1988 |
| 4670098 |
Process for preparing cellulose pulp from lignocellulosic material while removing high molecular weight substances from the pulping liquor |
Jun. 2, 1987 |
| 4631129 |
Production of pure sugars and lignosulfonates from sulfite spent liquor |
Dec. 23, 1986 |
| 4601262 |
Energy balance process for the pulp and paper industry |
Jul. 22, 1986 |
| 4533433 |
Method of covering the chemical losses in pulp production |
Aug. 6, 1985 |
| 4522685 |
Method of operating a spent pulping liquor combustion apparatus |
Jun. 11, 1985 |
| 4508593 |
Process for recovery of sulfur dioxide liberated in the chemical pulping of lignocellulosic material |
Apr. 2, 1985 |
| 4486394 |
Alkali regeneration process |
Dec. 4, 1984 |
| 4481074 |
Process for the preparation of a sodium sulphite containing liquor |
Nov. 6, 1984 |
| 4456750 |
Method for controlling the alkalinity of feed circulation when prehydrolyzing wood chips |
Jun. 26, 1984 |
| 4431617 |
Methods for removing malodorous sulfur compounds from pulp mill flue gases and the like by using green liquor |
Feb. 14, 1984 |
| 4414060 |
Method for sulfite pulping using water-soluble molybdenum containing compounds |
Nov. 8, 1983 |
| 4347102 |
Elimination of potassium compounds from sodium-based pulped cycles |
Aug. 31, 1982 |
| 4336102 |
Method for recovery and reuse of ammonia in ammonia-base sulfite cooking liquors |
Jun. 22, 1982 |
| 4334956 |
Method of reutilizing kraft spent liquor |
Jun. 15, 1982 |
| 4303469 |
Process and apparatus for recovery of spent pulping liquors |
Dec. 1, 1981 |
| 4253911 |
Process for maintaining a low sodium chloride content in recycled sodium chemicals of sodium-based pulp manufacturing processes |
Mar. 3, 1981 |
| 4244779 |
Method of treating spent pulping liquor in a fluidized bed reactor |
Jan. 13, 1981 |
| 4241041 |
Methods for the recovery of sulfur components from flue gas and recycle sodium sulfite by reduction-smelting and carbonating to strip hydrogen sulfide |
Dec. 23, 1980 |
| 4227966 |
Method for combusting a mixture of spent magnesium sulphite digestion liquor and alkaline oxygen bleach liquor |
Oct. 14, 1980 |
| 4212702 |
Process for recovery of chemicals from pulping waste liquor |
Jul. 15, 1980 |
| 4155804 |
Removal of volatile organic components from spent sulfite effluent |
May. 22, 1979 |
| 4155848 |
Wet oxidation of wastes with circulation |
May. 22, 1979 |
| 4154643 |
Recovery process and apparatus for alkali metal-containing spent liquor |
May. 15, 1979 |
| 4153670 |
Method of treating an alkali metal sulfide liquor |
May. 8, 1979 |
| 4148684 |
Methods for recovery and recycling of chemicals from sodium sulfite and sodium bisulfite pulping operations |
Apr. 10, 1979 |
| 4141785 |
Process for recovery of chemicals from pulping waste liquor |
Feb. 27, 1979 |
| 4110154 |
Method for making a soluble sulfite additive for use in a pulp making process |
Aug. 29, 1978 |
| 4098639 |
Process for reducing the requirement of fresh chemicals without increasing emissions in the pulping of cellulosic material |
Jul. 4, 1978 |
| 4083930 |
Method of treating alkali metal sulfide and carbonate mixtures |
Apr. 11, 1978 |
| 4066543 |
Continuous process for non-catalytic oxidation of sulfite-containing waters |
Jan. 3, 1978 |
| 4035228 |
Recovery process and apparatus for alkali metal-containing waste liquor |
Jul. 12, 1977 |
| 3969184 |
Digestion odor control |
Jul. 13, 1976 |
| 3962080 |
Sodium sulfur oxides wastes disposal process |
Jun. 8, 1976 |
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