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Article: Hot peroxide bleaching.
- Article from:
- Canadian Chemical News
- Article date:
- January 1, 1998
- Author:
CopyrightCOPYRIGHT 1998 Chemical Institute of Canada. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Temperature control is vital to maximization of the peroxide bleaching process.
Hydrogen peroxide ([H.sub.2][O.sub.2]) bleaching of cellulosic fibers obtained from wood and non-wood materials is a fairly well known technology. Conventionally, hydrogen peroxide is used in the bleaching of high yield mechanical and chemi-mechanical pulps as a lignin retaining bleaching agent. Today, in paper recycling, the application of peroxide for improving the brightness of waste paper furnishes such as Mixed Office Waste (MOW) and Old Newsprint (ONP) is quite common. In chemical pulp bleaching, with the increased amount of chlorine dioxide substitution in the first stage, the use ...