| Patents for D21C 11 - Regeneration of pulp liquors (4,054) |
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| 08/15/1978 | US4106978 Method of preventing explosions using a smelt water explosion inhibitor |
| 08/15/1978 | CA1036723A1 Method or reducing the emission of organic substances from cellulose plants |
| 07/04/1978 | US4098673 Agglomeration |
| 07/04/1978 | US4098639 Process for reducing the requirement of fresh chemicals without increasing emissions in the pulping of cellulosic material |
| 06/06/1978 | US4093508 Process for recovering chemicals from the waste liquors of sulfate cellulose digestion and the waste waters of bleaching |
| 04/18/1978 | US4085000 Method of recovering tall-oil soap from kraft black liquor |
| 03/21/1978 | US4079585 Method and apparatus for removing volatile fluids |
| 03/14/1978 | US4079001 Process for the purification of industrial effluents |
| 02/28/1978 | US4076576 Method and apparatus for the evaporation of liquids |
| 02/14/1978 | US4073727 Process for the oxidation of waste liquors arising from the manufacture of paper pulp |
| 02/14/1978 | US4073678 High yield semichemical wood pulping process |
| 01/31/1978 | US4071612 Process for the incineration of contaminated salt-bearing solutions |
| 01/31/1978 | US4071398 Chemical concentration by sequential activated carbon adsorption and fractionation |
| 01/24/1978 | US4070233 Delignifying |
| 01/10/1978 | US4067767 Liquid phase coking of spent kraft pulping liquors |
| 11/15/1977 | US4058433 Conversion of sulfur in blank liquor to eliminate odorous emissions and facilitate the collection of sulfate soaps |
| 10/11/1977 | US4053352 Method for producing oxidized white liquor |
| 09/20/1977 | US4049787 Process for separating sulphur in the form of hydrogen sulphide from clarified green liquor obtained from the combustion of waste liquor |
| 09/20/1977 | US4049490 Electrodialysis of bleaching effluent |
| 09/20/1977 | US4049489 Method of producing pulp and burning waste liquor obtained thereby |
| 08/30/1977 | US4045368 Pitch, oxidation |
| 08/02/1977 | US4039372 Bleach plant filtrate recovery |
| 07/12/1977 | US4035228 From pulping process |
| 06/21/1977 | US4030968 Disposal of paper pulp mill sludge |
| 05/10/1977 | US4022653 Process for separating soap from black liquor |
| 04/05/1977 | US4016180 Chemical concentration by adsorption |
| 03/29/1977 | US4014296 Plant for burning fuels producing a liquid combustion residue |
| 03/22/1977 | US4013516 Apparatus and process for the pyrolysis of waste solids concentrates |
| 03/08/1977 | US4011129 Converting sodium sulfate to sodium sulfide |
| 03/08/1977 | US4011047 Smelt spout for recovery boiler |
| 02/08/1977 | US4007082 Kraft mill recovery system |
| 01/25/1977 | US4004966 Combustion, flue gas, absorption, ammonia, ammonium monosulfite-bisulfite |
| 01/11/1977 | US4002525 Chemical recovery from waste liquors utilizing indirect heat exchangers in multi-stage evaporation plus contact steam stripping |
| 12/28/1976 | US4000264 Method of recovering sodium hydroxide from sulfur free pulping or bleaching waste liquor by mixing ferric oxide with condensed waste liquor prior to burning |
| 12/28/1976 | US4000034 Pulping lignocellulose, countercurrent washing in a column |
| 12/21/1976 | US3998732 Method for purifying water of organic compounds not readily biodegradable |
| 12/14/1976 | US3997439 Zirconyl chloride |
| 12/14/1976 | US3997300 Black liquor oxidation apparatus |
| 12/07/1976 | US3996097 Kraft mill recovery system |
| 11/09/1976 | US3990969 Purification of waste water from sulphate pulp bleaching plants |
| 10/26/1976 | US3988198 Method for treating hemi caustic effluents |
| 10/26/1976 | US3987641 Freeze concentration recovery process for wood pulping |
| 10/19/1976 | US3986951 Aluminum compounds, precipitation, chlorine, sodium chloride, hydroxide, and hypochlorite |
| 10/19/1976 | US3986923 Removal of dissolved salts from sulphide liquors |
| 08/17/1976 | US3975268 Method of largely eliminating volume change in a resin bed due to changes in the pH of liquid equipment by use of resin mixtures with compensating properties |
| 07/13/1976 | US3969184 Digestion odor control |
| 06/01/1976 | US3960648 Method for treating pulp-containing waste liquors |
| 05/25/1976 | US3959068 Process and apparatus for recovery of sulfur from a polysulfide pulping operation |
| 05/04/1976 | US3954552 Removal of sodium chloride from pulp mill systems |
| 04/13/1976 | US3950217 Evaporation, deposits, separation |
| 03/23/1976 | US3945880 Leaching |
| 03/16/1976 | US3944462 Coking of waste kraft pulping liquors at lowered pH |
| 03/02/1976 | US3941634 Method for the preparation of paper containing plastic particles |
| 01/13/1976 | US3932584 Method for purifying hydrogen sulfide-containing gas |