Procedure for delignification of sulphate pulp

Details Procedure for delignification of sulphate pulp Procedure for delignification of sulphate pulp

D - Textiles, Paper

21

C

9/17

D21C 9/00 (2006.01) D21C 9/10 (2006.01)

Patent

CA 1268906

ABSTRACT In the manufacture of bleached sulphate pulp a chemical cellulose pulp is delignified with an alkaline polysulphide solution after cooking but before any bleaching. According to the invention the pulp is treated after digestion at a temperature of 100-160 °C with a solution containing 0.2-0.6 mol/l effective alkali, 0.5-5 per cent by weight sulphur of the weight of the pulp in the form of polysulphide, i.e. Na2Sx, where x is 2 or higher, and in the presence of a stabilizer for polysulphide.

500799

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