METHOD OF EXTRACTION OF LARCH WOOD CHIPS

摘要

FIELD: textiles, paper.SUBSTANCE: method of extraction of larch wood chips using the batch-operated boiler for cooking sulphate cellulose includes extraction of wood chips with water at elevated temperature with subsequent processing of the extract. Extraction is carried out in two consecutive stages with use of black liquor at the second stage at its estimated elapsed time as the extract. Water extraction is carried out with fresh water in the mode of extractant recirculation with automatic measurement during the extraction of the electrical conductivity of the extract and automatic calculation on the measured data of the derivative of this parameter of time. With a reference value of the electrical conductivity derivative of time the second stage is followed using automatic system of process control.EFFECT: increased level of removal of organic matter from wood chips without its mechanical breakdown, and the possibility of carrying out the extraction process in the automatically controlled mode.3 cl, 1 dwg