High temperature peroxide bleaching of mechanical pulps
A method of making bleached mechanical pulps is disclosed for pulping mills having a primary and a secondary refiner. A first step (100) is to provide cellulosic materials, such as wood chips to refine into the pulp; the wood chips have an initial brightness level. A second step (102) is to provide...
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| creator | ROBERT T. HAMILTON ZEECHA L. BROOKS ANTHONY PARRISH ROGER O. CAMPBELL KAAREN K. HAYNES |
| description | A method of making bleached mechanical pulps is disclosed for pulping mills having a primary and a secondary refiner. A first step (100) is to provide cellulosic materials, such as wood chips to refine into the pulp; the wood chips have an initial brightness level. A second step (102) is to provide a bleaching liquor to the refining system of the pulp mill, wherein the liquor comprises an amount of hydrogen peroxide and an amount of alkali having greater than 0% to 100% magnesium hydroxide or soda ash or a combination thereof. A third step (104,106) is to hold the pulp with the bleaching liquor at a temperature in the range of about 85 DEG to about 160 DEG C and for about 2 to about 180 minutes. |
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| subjects | APPARATUS THEREFOR FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT PAPER-MAKING PRODUCTION OF CELLULOSE PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS REGENERATION OF PULPING LIQUORS TEXTILES TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKINGMACHINE |
| title | High temperature peroxide bleaching of mechanical pulps |
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