FIELD: chemistry.
SUBSTANCE: method involves evaporation of black liquor and obtaining a solution of soda, sodium sulphide and sulphate. Before evaporation, lignin is extracted from the black liquor. The lignin mother solution undergoes polythermal evaporation to 200-300 g H2O/100 g of dry sodium salts at temperature 60-150°C to obtain a soda-sulphate mixture, where a portion of sodium sulphate is reduced to sodium sulphide.
EFFECT: high production efficiency based on lowering power consumption on obtaining cellulose and eliminating the environmental hazard of the process of regenerating alkalis by removing the recovery boiler from the process.
2 cl, 1 dwg
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| METHOD OF ALKALI VAPORIZATION IN THE PRODUCTION OF CELLULOSE | 2017 |
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| METHOD FOR PREPARATION OF COOKING LIQUOR FOR CELLULOSE SULFATE DIGESTION | 1990 |
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RU2015236C1 |
