Bleaching process

Details Bleaching process Bleaching process

D - Textiles, Paper

21

C

D21C 9/16 (2006.01)

Patent

CA 2278399

A process is provided herein for peroxide bleaching of pulp using magnesium oxide or magnesium hydroxide as a substitute for caustic soda. The process includes the first step of treating pulp using a peroxide bleaching solution comprising a peroxide and at least one of magnesium oxide and magnesium hydroxide. The process includes the next step of maintaining the concentration of Mn to less than 10 ppm and the concentration of Fe to less than 20 ppm by selecting a chelating agent and adding the selected chelating agent to the peroxide bleaching solution in accordance with the following criteria, namely (a) monitoring a concentration of Mn in the peroxide bleaching solution and, when the Mn concentration is greater than 10 ppm, adding a chelating agent which is selected from the group consisting of DTMPA, DTPA, EDTA and HEDTA, and (b) monitoring the concentration of Fe in the peroxide bleaching solution and, when the Fe concentration is greater than 20 ppm, adding a chelating agent which is selected from the group consisting of an alkali, metal silicate and DTPMPA. In this way, a maximum target ISO brightness of 80 is achieved.

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