Ethoxylated alcohol and dialkylphenol surfactants as Kraft pulping additives for reject reduction and yield increase
AssigneeBetz PaperChem, Inc.
InventorsTien-Feng Ling, Theresa D. Hancock
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Abstract
A method for enhancing the penetration of cooking liquor into wood chips to form a Kraft pulp which comprises adding to the cooking liquor specific surfactants such as ethoxylated dialkylphenols and ethoxylated alcohols.
Claims6
A method for enhancing the penetration of cooking liquor into wood chips, the method comprising cooking wood chips in a Kraft liquor to form a Kraft pulp and including at least two surfactants having the general formula:
- R--O(CH.sub.2 CH.sub.2 O).sub.n H
- where n is an integer from 1 to 50 and R is oleyl in at least one of said surfactants, and R is isostearyl in at least one other of said surfactants, said method resulting in the formation of a microemulsion, an increase in pulp yield and a decrease in reject levels.
A method for enhancing the penetration of cooking liquor into wood chips, the method comprising cooking wood chips in a Kraft liquor to form a Kraft pulp and including at least two surfactants having the general formula:
- ##STR3## where n is an integer from 1 to 50 and R is nonyl in each of said surfactants, said method resulting in the formation of a microemulsion, an increase in pulp yield and a decrease in reject levels.
Dependencies are inferred from the claim text.