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US 6,551,452 B2Granted
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 woodchips into pulp. The invention also relates to the digester additive compositions.
Claims7
A process for digesting woodchips used in papermaking comprising:
- adding an effective digesting amount of a digester additive comprising a mixture of (a) a polyglycoside, and (b) a polyoxyalkylene glycol to a mixture comprising pulping woodchips and white liquor, wherein the active weight ratio of (a) to (b) is from 10:90 to 90:10.
Dependencies are inferred from the claim text.