FIELD: paper-and-pulp industry.
SUBSTANCE: preparation of white alkali liquors finding use, for example, in sulfate pulping process, involves exposing oxidized white alkali liquor, which is obtained by oxidation of white alkali liquor with oxygen-containing gas in presence of lime sludge and/or manganese dioxide, to controlled temperature. Controlled temperature provides increase in concentration of UV-detectable (at 285 or 286°C) polysulfide or visible light-detectable (at 416 nm) polysulfide, while weight ratio of UV-detectable polysulfide to gravimetrically measured polysulfide or visible light-detectable polysulfide to gravimetrically measured polysulfide is also raised.
EFFECT: increased percentage of active polysulfide in total polysulfide, which can be used to increase yield of cellulose in sulfate pulping process.
44 cl, 11 tbl, 13 ex
| Title | Year | Author | Number |
|---|---|---|---|
| IMPROVEMENT OF ACTIVE POLYSULPHIDE GENERATION | 2005 |
|
RU2367593C2 |
| METHOD FOR PREPARING ALKALINE COOKING SOLUTION FOR PRODUCING CELLULOSE POLYSULFIDE | 0 |
|
SU1112081A1 |
| METHOD FOR SULPHATE PULPING USING POLYSULPHIDE (VERSIONS) | 2008 |
|
RU2424387C1 |
| METHOD OF PRODUCING CELLULOSE PULP | 2012 |
|
RU2606867C2 |
| METHOD OF PREPARING SODIUM POLYSULPHIDE SOLUTION FOR PULP DIGESTION | 0 |
|
SU907118A1 |
| METHOD OF PREPARING SODIUM POLYSULPHIDE SOLUTION FOR PULP DIGESTION | 0 |
|
SU1326692A1 |
| HETEROGENEOUS CATALYST FOR OXIDATION OF INORGANIC AND / OR ORGANIC COMPOUNDS | 2019 |
|
RU2699228C1 |
| METHOD OF PREPARING POLYSULFIDE OF ALKALI METAL FOR DIGESTING CELLULOSE-CONTAINING PRIMARY MATERIAL | 0 |
|
SU1093739A1 |
| METHOD OF PRODUCING FIBROUS SEMIFINISHED MATERIAL | 0 |
|
SU1130634A1 |
| CELLULOSE PRODUCTION METHOD | 2018 |
|
RU2808813C2 |
