METHOD TO PRODUCE SULFATE CELLULOSE Russian patent published in 2011 - IPC D21C3/02 D21C11/06 B01D53/48 B01D53/52 

FIELD: textile, paper.

SUBSTANCE: method includes stages of raw materials loading, its compaction, supply of cooking liquor, increase of temperature and pressure up to working parameters, soaking of the boiler content at the specified temperature, blowing of mass into a blow tank and removal of boiling vapours in process of blowing from the blow tank. Boiling vapours are removed during boiling through a three-stage condensation system in a counterflow mode. At the inlet of the first stage the temperature of a cooling agent - a solution of calcium chloride is maintained within the range of 40-50°C. At the inlet of the second stage the temperature is maintained within the limits of 17-27°C. At the inlet of the third stage the temperature is maintained below 0°C. The line of boiling vapours removal is isolated from environment by a mechanical lock in the beginning and by a hydraulic lock in the end. Removal of non-condensed vapours is carried out by means of ejection.

EFFECT: prevention of hazardous emissions into atmosphere and catching precious components from steam and gas mixture.

1 dwg