Method and pulping composition for the selective delignification

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...

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162 72, 162 77, D21C 320

Patent

active

045978301

ABSTRACT:
A pulping liquor for the delignification of lignocellulosic materials is disclosed which avoids the use of sodium hydroxide and so avoids degradation of substantial portions of the cellulose component, and simultaneously avoids the use of sulphide or other environmental pollutants. The cooking process employing this liquor can advantageously include recycling of the liquor to provide sustained delignification from the same original liquor provided, and distillation of spent liquor to recover the essential components thereof.
The liquor is comprised of alcohol, an amine and water, each present in amount of 1-12 parts by volume. The liquor is further used in the presence of a quinone and/or azine catalyst.

REFERENCES:
patent: 3585104 (1971-06-01), Kleinert
patent: 3980677 (1976-09-01), Hohmann et al.
patent: 4178861 (1979-12-01), Vanderhock et al.
Green et al., "Alkaline Pulping in Aqueous Alcohols and Amines"; TAPPI May 1982, vol. 65, No. 5, p. 133.

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