RECOVERY OF PERFORMED COOKING SOLUTIONS AT OXIDATIVE-ORGAN-SOLVENT WARNES IN NEEDRE PLANT RAW MATERIALS
Abstract
The possibility of recovering the spent cooking solution with the replacement of the missing amount of lignifying reagents in the oxidative-organic solvent cooking of non-woody plant raw materials (rice husk) with preliminary alkaline treatment and the production of technical pulp with desired properties is shown. Analysis of scientific and patent information revealed that two methods of regeneration are used for regeneration of spent cooking solutions during oxidation-organosolve cooking: azeotropic distillation and return of part of the spent cooking solution for re-cooking with the completion of the missing amount of reagents. For the oxidation-organosolvent cooking non-wood plant materials the most promising is the second option. To avoid the preservation of mineral components in industrial pulp, non-wood plant materials are subjected to alkaline treatment. It has been established that to obtain technical pulp with recovery of the spent cooking solution, it is required two times less acetic acid and 1.7 times fresh water as compared to oxidation-organic solvent cooking under standard conditions with a constant amount of caustic soda.
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