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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Example Embodiment
[0022] Example 1:
[0023] Masson pine grinding stone ground wood pulp (SGW) unbleached pulp, brightness 50% ISO, in a polyethylene plastic bag and placed in a water bath for hydrogen peroxide bleaching, add chitosan (deacetylation degree 85%) 2kg / Ton pulp, H 2 O 2 30kg / ton of pulp, sodium hydroxide 20kg / ton of pulp, sodium silicate 20kg / ton of pulp, pulp concentration 25%, bleaching temperature 75℃, bleaching time 1.5h, bleached pulp whiteness 72%ISO.
[0024] Control experiment 1-1: As described in Example 1, the difference is that no chitosan is added during the bleaching process, and other conditions are the same. The whiteness of the obtained bleached pulp is 69% ISO.
[0025] Control experiment 1-2: As described in Example 1, the difference is that no chitosan is added during the bleaching process, but 2kg / ton pulp EDTA is added. Other conditions are the same. The whiteness of the obtained bleached pulp is 70% ISO .
Example Embodiment
[0026] Example 2:
[0027] The unbleached pulp of poplar PRC-APMP after the first stage of refining, with a brightness of 54% ISO, is placed in a polyethylene plastic bag and placed in a water bath for hydrogen peroxide bleaching, and chitosan is added (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℃, bleaching time 2.0h, bleached pulp whiteness 80%ISO.
[0028] Control experiment 2-1: As described in Example 2, the difference is that no chitosan is added during 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 no chitosan was added during the bleaching process, but 2kg / ton of DTPA was added, and the brightness of the obtained bleached pulp was 78.5% ISO.
Example Embodiment
[0030] Example 3:
[0031] Poplar CTMP unbleached pulp, whiteness 52%ISO, in a polyethylene plastic bag and placed in a water bath for hydrogen peroxide bleaching. The added bleaching chemicals are 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℃, bleaching time 1.5h, bleached pulp brightness 81%ISO.
[0032] Control Experiment 3-1: As described in Example 3, the difference is that when no chitosan is added during the bleaching process, the whiteness of the obtained bleached pulp is 78.5% ISO.
[0033] Control experiment 3-2: As described in Example 3, the difference is that when the bleaching process does not add chitosan, but adds 4kg / ton pulp EDTA, the whiteness of the obtained bleached pulp is 79.5% ISO.
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