Why Asian Pulp Producers Are Investing in Ozone Bleaching

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  • アジアのパルプ生産者がオゾン漂白への投資を進める理由
  • アジア ノ パルプ セイサンシャ ガ オゾン ヒョウハク エ ノ トウシ オ ススメル リユウ

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Abstract

<p>There are now more than 23 pulp mills globally that are producing almost 10 million tons per year of ozone bleached pulp. The pulp is made up of both hardwood and softwood, and final products range from fluffed pulp to dissolving pulp, to printing and writing grades. New mega-mills under construction have now chosen ozone as a bleach chemical, while mills that have been using ozone for a few years are installing extra ozone capacity so that they can convert their total production to Z-ECF or TCF bleaching.</p><p>Ozone use in conjunction with chlorine dioxide, the so called ECF light or Z-ECF sequences have proven to be the most economical while still improving pulp quality and reducing the impact of the bleach plant on the environment. The high bleaching efficiency of ozone allows a drastic reduction in the consumption of expensive bleaching chemicals-chlorine dioxide in ECF bleaching and hydrogen peroxide in TCF bleaching, and sodium hydroxide in both cases. The implementation of ozone bleaching also results in the reduction of steam requirements during the bleaching process.</p>

Journal

  • JAPAN TAPPI JOURNAL

    JAPAN TAPPI JOURNAL 71 (9), 1006-1009, 2017

    JAPAN TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY

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