Pulping with an alkaline liquor containing a cyclic keto...

Details Pulping with an alkaline liquor containing a cyclic keto... Pulping with an alkaline liquor containing a cyclic keto...

D - Textiles, Paper

21

C

9/16

D21C 3/02 (2006.01) D21C 3/22 (2006.01)

Patent

CA 1110412

ABSTRACT Lignocellulosic materials, e.g., wood, bagasse, straw, reeds, and other plants and crops can be de- lignified effectively by soda-type pulping with an alkaline liquor containing small quantities of both ethylenediamine or like diamine compound, and a cyclic keto compound, e.g., anthraquinone or 2-methyl-anthra- quinone. The diamine is not effective, in the absence of the quinone significantly to affect pulping rate, yield or physical strength properties of the pulp. Nevertheless, in the presence of the cyclic keto com- pound, the diamine either reduces the amount of cyclic keto compound required to achieve the desired pulping rate and the yield, or improves the physical strength properties of the delignified pulp to kraft-like values. Pulping rates comparable to kraft are achieved and the pulps thereby obtained have excellent physical properties, especially tear strength.

308838

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