Pressurized peroxide bleaching

Details Pressurized peroxide bleaching Pressurized peroxide bleaching

D - Textiles, Paper

21

C

D21C 9/16 (2006.01)

Patent

CA 2132057

ABSTRACT OF THE DISCLOSURE Paper pulp, typically having a consistency of about 8-20%, is mixed with hydrogen peroxide and bleached at superatmospheric pressure (typically about 25-150 psig). When bleaching at superatmospheric pressure, and at a temperature of about 80-140°C (preferably about 90-110°C), brightness comparable to atmospheric bleaching for three hours can be obtained in 45-60 minutes for a given peroxide charge (e.g. 1-4 kg per ton of pulp). Bleaching can take place in a reaction vessel having overpressure provided by a gas, such as substantially pure oxygen, or nitrogen.

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