Method and arrangement of impregnating chips

Details Method and arrangement of impregnating chips Method and arrangement of impregnating chips

2007-03-27

2009-11-10

Halpern, Mark (Department: 1791)

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Continuous chemical treatment or continuous charging or...

C162S019000, C162S052000, C162S068000, C162S237000

Reexamination Certificate

active

07615134

ABSTRACT:
The method and an arrangement are for improved impregnation of chips in association with the manufacture of chemical cellulose pulp. Un-steamed chips are fed into an impregnation vessel (30) in which a fluid level (LIQ_LEV) is established under the highest level (CH_LEV) of the chips. An improved impregnation arrangement for the chips is obtained by the addition of impregnation fluids (BL1/BL2/BL3) with increasing temperatures at different heights (P1, P2, P3), and by the establishment of a counter-flow zone (Z1) in the uppermost part of the impregnation vessel. The requirement for steaming may in this way be dramatically reduced while at the same time the amount of expelled waste gases may be minimized. A major part of the volatile compounds present in the wood are bound to the impregnation fluid (REC) that is withdrawn.

REFERENCES:
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patent: 5256255 (1993-10-01), Fagerlund
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patent: 1154622 (1983-10-01), None
patent: 523850 (2004-05-01), None
Sven Rydholm, “Continuous Pulping Processes”, Technical Association of the Pulp and Paper Industry, 1970, p. 144.

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