Method and apparatus for continuously pulping cellulosic...

Details Method and apparatus for continuously pulping cellulosic... Method and apparatus for continuously pulping cellulosic...

D - Textiles, Paper

21

C

D21C 7/14 (2006.01) D21C 3/24 (2006.01) D21C 7/12 (2006.01)

Patent

CA 2282065

In the production of chemical pulp, such as kraft pulp, it is possible to reduce the amount of ancillary equipment, and/or the size of the continuous digester vessel, while achieving enhanced uniformity of treatment by avoiding "hang ups". Instead of providing vertical counter-current flow of liquid and comminuted cellulosic fibrous material being treated in the lower half of the digester, the counter-current flow may be a cross flow, that is substantially horizontal (e.g. radial) while the flow of the chip column is vertical. Regardless of the configuration of the digester vessel, a single pump may be utilized for all of the recirculations, or only a few pumps for all of the recirculations.

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