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US 6,649,023 B1Granted
Process for digesting woodchips and digester additives
AssigneeAshland Inc.
InventorsGeorge K. Wai, Abdul Q. Khan
Life of this patent
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Abstract
The invention relates to a process for digesting woodchips used in papermaking. The process employs a digester additive, which is a mixture of (a) a polyglycoside, and (b) a polyoxyalkylene glycol. The digester additives are compatible and stable at elevated temperatures in the highly alkaline white liquor used in the digestion of wood chips into pulp. The invention also relates to the digester additive compositions.
Claims7
A digester additive comprising:
- (a) a polyglycoside, and
- (b) a polyoxyalkylene glycol,
- wherein the weight ratio of (a) to (b) is from about 10:90 to 90:10.
Dependencies are inferred from the claim text.