Method for improving heat economy in the batchwise digestion of

Details Method for improving heat economy in the batchwise digestion of Method for improving heat economy in the batchwise digestion of

1974-10-17

1977-03-01

Lindsay, Jr., Robert L.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With testing, sampling or analyzing

162 61, D21C 712

Patent

active

040100669

ABSTRACT:
A method for improving heat economy in the batchwise digestion of lignocellulosic material especially when using a batch digester with a digestion or cooking liquor in which the digestion or cooking chemicals are dissolved, such as in sulphate, sulphite, bisulphite, oxygen, peroxide and ammonium hydroxide digestion processes, and also in the manufacture of high yield semichemical pulps.
A superatmospheric gas pressure is applied above the level of the liquor in a batch digester; the level of the digester liquor is determined after the liquor has been absorbed by a batch lignocellulosic material; the level of free digestion liquor is then adjusted to that level providing an amount including the absorbed liquor to digest the lignocellulosic material; and then the material is digested under the superatmospheric pressure to form cellulose pulp.

REFERENCES:
patent: 2909239 (1956-01-01), Bennett
patent: 3159527 (1964-12-01), Helland
patent: 3210237 (1965-10-01), Madison
patent: 3215588 (1965-11-01), Kleinert
patent: 3764464 (1973-10-01), Samuelson
patent: 3785920 (1974-01-01), Vohansen
"Autocook System Brings Full Automation to Batch Digesters," MacLeod Paper Trade Journal; Aug. 16, 1971.
Pulping Processes, Rhydholm, pp. 334-335, Interscience Publishers, New York, 1965.

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