Oxygen bleaching of pulp in presence of high-silica protector

Details Oxygen bleaching of pulp in presence of high-silica protector Oxygen bleaching of pulp in presence of high-silica protector

D - Textiles, Paper

21

C

8/78.1

D21C 9/10 (2006.01)

Patent

CA 1062858

OXYGEN BLEACHING OF PULP IN PRESENCE OF HIGH-SILICA PROTECTOR Abstract of the Disclosure The disclosed colloidal high silica protector materials protect carbohydrates in chemical cellulosic pulps from oxidative attack during oxygen bleaching in alkaline media at elevated temperatures and superatmospheric pressure. These protector materials are useful in processes which produce high yields of semi-bleached and fully bleached pulps. The preferred bleach sequences for fully bleached pulps begin with an O stage, e.g. O-D-H, O-D, ODED, and OH, as well as OCEDED, OCED, OCDEDED, etc. A fully bleached kraft pulp of this invention compares favorably in virtually all respects to a fully bleached kraft pulp obtained by the environmentally objectionable chlorine bleach sequences. The preferred protectors are high silica water glass compositions wherein the silica/sodium oxide ratio is at least 1.6, preferably at least about 2.0 on a weight/weight basis.

234066

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