Home

Primary Examiner: Lindsay, Jr., Robert L.
Assistant Examiner: Alvo, Steve
Attorney:

Next ten patents ordered by date:

Process of preventing formation of resinous deposits in the manufacture of paper and the like
Removal of radioactive contamination from a nuclear reactor coolant
Nuclear reactor fuel rod
Absorber element for pebble-bed reactors
Clarification of xanthan gum
Free-flowing enzyme composition
Method for purification and recovery of urokinase
Process for producing 4-thiouracil
Reactor for stabilized microbes having photometabolic activity
Bacteriological transfer loop

Translate:
En
De
Es
Fr
It
Pt
Ja
Ko
Zh

Title: Method for improving heat economy in the batchwise digestion of lignocellulosic material by adjusting the level of free digestion liquor

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.

Do you think this is a good invention? Vote now:

Votes so far: For:(0) Against:(0)
Other info:

Inventors: Olson, Ulf Torbjorn (Moliden, SW)
Hagglund, Erik Olof Sture (Ornskoldsvik, SW)

Application Number: 515736
Filing Date: 1974-10-17
Publication_date: 1977-03-01
Assignee: Mo och Domsjo (Ornskoldsvik, SW)
Primary Class(es): 162/49 162/61
Other Classes:
US Patent Ref:

2909239	Jan, 1956	Bennett	162/238.
3159527	Dec, 1964	Helland	162/61.
3210237	Oct, 1965	Madison	162/61.
3215588	Nov, 1965	Kleinert	162/19.
3764464	Oct, 1973	Samuelson	162/65.
3785920	Jan, 1974	Vohansen	162/246.

Other Refs: Other References: "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.