D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 3/02 (2006.01)
Patent
CA 2312403
The invention relates to a system and a process for the oxygen delignification of pulp consisting of lignocellulose-containing material whose mean concentration is 8-18% pulp consistency, in at least two stages. The invention is characterized in that the oxygen delignification takes place in a first stage with a short dwell time of approx. 3-6 minutes, at a low temperature of approx. 85°C and under a low pres- sure of approx. 0-4 bar, followed by a concluding stage with a longer dwell time of approx. 50-90 minutes, at a higher temperature of approx. 100°C and under a higher pressure of approx. 8-10 bar. This makes it possible, in an industrial process, to exploit the kinetics of the oxygen deligni- fication in an optimal manner for the purpose of obtaining a selective oxygen delignification at low installation cost and at low operating cost.
Dahllof Hakan
Ragnar Martin
Gl&v Management Hungary Kft
Kvaerner Pulping Ab
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