Method of deresinating pulp using alkyl alcohol alkoxylate...

Details Method of deresinating pulp using alkyl alcohol alkoxylate... Method of deresinating pulp using alkyl alcohol alkoxylate...

2006-07-25

2006-07-25

Hug, Eric (Department: 1731)

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Treatment with particular chemical

C162S076000, C162S077000, C162S090000, C162S017000

Reexamination Certificate

active

07081183

ABSTRACT:
This invention is a method of reducing the resin content of chemical pulps comprising heating wood chips in an aqueous alkaline medium in the presence of an effective deresinating amount of an alkyl alcohol alkoxylate of formula RO[(CH2CHCH3O)x(CH2CH2O)y]M wherein R is C4to C40alkyl; x is 1–50; y is 0–100 and M is H or an alkali metal, a cooking liquor comprising sodium hydroxide and sodium sulfite and the alkyl alcohol alkoxylate and a deresinated pulp prepared according to the method.

REFERENCES:
patent: 3909345 (1975-09-01), Parker et al.
patent: 5250152 (1993-10-01), Ling et al.
patent: 5298120 (1994-03-01), Blackstone
patent: 5501769 (1996-03-01), Blackstone et al.
patent: 5728265 (1998-03-01), Saint Victor et al.
patent: 5871663 (1999-02-01), Turner
patent: WO 99/20828 (1999-04-01), None

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