FIELD: textiles, paper.
SUBSTANCE: method includes the use of three batch-operated boilers for kraft process, consistently linked together by a liquid phase, carrying out a two-stage extraction in them - with water on the first stage and the black liquor on the second, and the aqueous extract is removed from the boilers by its displacement by the black liquor, and the black liquor is removed by its displacement by the cooking liquor. The whole process of extraction and filling the boilers with the cooking liquor is carried out in an automatically controlled manner following the sensor signals of filling the boilers with extractants and the cooking liquor.
EFFECT: high level of extraction from the chips of components harmful for subsequent cooking is achieved to obtain an aqueous extract with high content of arabinogalactan and flavonoids.
6 cl
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