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AssigneeBASF Wyandotte Corporation
InventorsJoseph V. Otrhalek, Gilbert Stephen Gomes, Gunther Hans Elfers
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As a tall-oil-soap skimming aid, there is added to black liquor resulting from the pulping of coniferous trees a terpolymer of (a) an alpha-beta-unsaturated acid, (2) an alkylate of an alpha-beta-unsaturated acid, and (3) allyl alcohol. The acid contains 3 to 4 carbon atoms and comprises about 60 to about 88 percent by weight of the terpolymer. The alkylate comprises about 6 to 28 parts by weight of the terpolymer, being an ester of the abovementioned acids, the ester having an alkyl portion containing 1 to 18 carbon atoms. Allyl-alcohol units are present in the terpolymer to an extent of 4.5 to 20 weight percent. The terpolymer can be produced by free-radical polymerization in accordance with the customary procedures. With the use of such a copolymer, the proportion of tall oil recovered from black liquor is very substantially increased.
A method of recovering tall-oil soap from a black liquor from a sulfate kraft pulping step, produced in the pulping of wood from a coniferous tree, said method comprising mixing with said liquor about 10 to 500 parts by weight, per one million parts by weight of said liquor, of a terpolymer consisting essentially of units which are:
Dependencies are inferred from the claim text.