METHOD TO PRODUCE SULFATE CELLULOSE Russian patent published in 2011 - IPC D21C3/02 D21C3/26 D21C11/00 D21C11/04 D21C11/06 

FIELD: textile, paper.

SUBSTANCE: method includes feeding raw materials into a boiling pot and its compaction. Supply of boiling liquid, increased temperature and pressure to working parameters. Soaking the pot content at the specified temperature. Blowing the mass into a blowing reservoir. Removal of boiling vapours and discharge of non-condensed gases by ejection. Removal of boiling vapours during blowing is carried out via a three-stage system of condensation in a counterflow mode. Upstream the three-stage system of condensation, the boiling vapours are mixed with spent alkali in a mixing condenser, and the mixture is heated up to 80-90°C. The heated spent alkali is supplied to a boiling pot arranged at the charging stage for preliminary heating of the process chips.

EFFECT: reduced power inputs due to recuperation of blowing vapours heat in the mixing condenser and using this heat for heating of alkali, which makes it possible to considerably reduce the required surface of condensation in the heat exchanger.

1 dwg, 1 ex