D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
9/2
D21C 3/04 (2006.01) A23K 1/12 (2006.01) C13K 1/02 (2006.01) D21C 3/26 (2006.01)
Patent
CA 1173602
\ Abstract The process according to the invention is related to the production of high alpha-cellulose pulps suitable for chemical processing and special papers by means of a multi- stage cook. Steamed chips are prehydrolyzed by using a strong acid, e.g. sulfuric acid, whereby 20 to 30 % of the dry matter of the wood is dissolved under suitable process conditions. The pre- hydrolysis liquor is removed from the cooker by means of a counter-current wash, whereafter the chips are conveyed to the actual sulfate cook. The hydrolysate is separated with a high dry matter content and efficiently. In addition to this, the process is charac- terized in that the furfural content of the prehydrolysis liquor is very low, which makes the further processing of the prehydrolysis liquor easier.
391377
Arhippainen Bengt
Hanninen Elisa
Marttala Tapani
Metsavirta Aarre
Nikula Matti
Ahlstrom (a.) Osakeyhtio
Gowling Lafleur Henderson Llp
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