Peroxide brightening/bleaching is an important unit operation for pulp and paper mills producing value‐added paper grades containing bleached mechanical pulps. In this paper, a number of process innovations have been discussed. They include: hydrosulphite assisted chelation process, the so‐called Qy process; DTPA spray; PN2process; PMprocess; Mg(OH)2‐based peroxide process. It will be shown that these processes can improve the peroxide brightening/bleaching processes in terms of (1) decreasing the production cost, (2) improving the product quality, and (3) decreasing the environmental impact.
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Yonghao Ni (2005) studied this question.
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