Method for alkaline hydrogen peroxide bleaching of paper pulp
A hydrogen peroxide and pulp bleaching technology, applied in the field of pulp and paper making, can solve problems such as low bleaching efficiency, and achieve the effect of improving bleaching effect and improving whiteness
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Embodiment 1
[0023] Masson pine groundwood pulp (SGW) unbleached pulp, whiteness 50% ISO, put in a polyethylene plastic bag and put it in a water bath for hydrogen peroxide bleaching, add chitosan (85% degree of deacetylation) 2kg / ton pulp, H 2 o 2 30kg / ton of pulp, 20kg / ton of sodium hydroxide, 20kg / ton of sodium silicate, pulp concentration 25%, bleaching temperature 75°C, bleaching time 1.5h, bleached pulp brightness 72% ISO.
[0024] Control experiment 1-1: As described in Example 1, the difference is that chitosan is not added in the bleaching process, and other conditions are the same, and the brightness of the obtained bleached pulp is 69% ISO.
[0025] Control experiment 1-2: as described in embodiment 1, the difference is that chitosan is not added in the bleaching process, but the EDTA that adds 2kg / ton pulp, other conditions are identical, the brightness of gained bleached pulp is 70%ISO .
Embodiment 2
[0027] Unbleached pulp after poplar PRC-APMP first stage refining, whiteness 54%ISO, in polyethylene plastic bag and put in water bath and carry out hydrogen peroxide bleaching, add chitosan (deacetylation degree 85%) )1kg / ton pulp, H 2 o 2 50kg / ton pulp, sodium hydroxide 25kg / ton pulp, sodium silicate 30kg / ton pulp, pulp concentration 25%, bleaching temperature 80°C, bleaching time 2.0h, pulp brightness after bleaching 80% ISO.
[0028] Control experiment 2-1: As described in Example 2, the difference is that chitosan is not added in the bleaching process, and the whiteness of the obtained bleached pulp is 77% ISO.
[0029] Control experiment 2-2: As described in Example 2, the difference is that chitosan is not added in the bleaching process, but DTPA of 2 kg / ton of pulp is added, and the brightness of the resulting bleached pulp is 78.5% ISO.
Embodiment 3
[0031]Poplar CTMP unbleached pulp, whiteness 52% ISO, put in polyethylene plastic bag and put in water bath and carry out hydrogen peroxide bleaching, the bleaching medicine that adds is as follows: Chitosan (deacetylation degree 90%) 2kg / ton Pulp, H 2 o 2 40kg / ton pulp, sodium hydroxide 25kg / ton pulp, sodium silicate 25kg / ton pulp, pulp concentration 30%, bleaching temperature 80°C, bleaching time 1.5h, pulp brightness after bleaching 81% ISO.
[0032] Control experiment 3-1: As described in Example 3, the difference is that when no chitosan is added in the bleaching process, the whiteness of the obtained bleached pulp is 78.5% ISO.
[0033] Control experiment 3-2: as described in embodiment 3, the difference is that chitosan is not added in the bleaching process, but EDTA of 4 kg / ton pulp is added, and the brightness of the resulting bleached pulp is 79.5% ISO.
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