Method of improving the homogenity at periodical digestion...

Details Method of improving the homogenity at periodical digestion... Method of improving the homogenity at periodical digestion...

D - Textiles, Paper

21

C

9/2

D21C 3/00 (2006.01) D21C 3/22 (2006.01)

Patent

CA 1081908

ABSTRACT OF THE DISCLOSURE A method of improving homogeneity in batch digestion of ligno- cellulose containing material in a digester, the circulation system of which is designed so that the cooking liquid is drawn off from the digester via a strainer girdle, heated in a calorisator and returned to the top and bottom, respectively, of the digester. During the heating phase the digester is subjected to boiling-up brought about by periodically heating only from below by a substantial supply of heat via the bottom circulation with a cooking liquid flow of 1-15m3/minute, preferably .3-8m3/minute, at the same time as the top circulation is held closed and pressure drop in the digester is prevented. The number of the boilings-up and the time intervals are adjusted to the digestion schedule in question, so that the greatest possible heat homogeneity in the digester is obtained during the entire part of the digesting process when delignification takes place.

249635

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