Method for improving hydrogen peroxide bleaching efficiency of paper pulp
A technology of hydrogen peroxide and pulp, applied in pulp bleaching, chemical/chemical mechanical pulp, etc., can solve the problems of low hydrogen peroxide bleaching efficiency, achieve the effect of improving bleaching effect, maintaining physical strength, and improving whiteness
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Embodiment 1
[0015] The unbleached pulp of poplar PRC-APMP after the first stage of pulping, the brightness is 54% ISO, is put in a polyethylene plastic bag and placed in a water bath for hydrogen peroxide bleaching, and the bleaching chemicals added are as follows: urea 10kg / ton Pulp, DTPA 1.5kg / ton pulp, H 2 o 2 50kg / ton pulp, sodium hydroxide 25kg / ton pulp, sodium silicate 30kg / ton pulp, pulp concentration 30wt%, bleaching temperature 85°C, bleaching time 2.0h, pulp brightness after bleaching 82%ISO. When no urea is added in the bleaching process and other medicines are the same, the whiteness of the obtained bleached pulp is 80% ISO. The physical strength of the bleached pulp obtained after adding urea during bleaching was basically the same as that of the control pulp without adding urea.
Embodiment 2
[0017] Poplar CTMP unbleached pulp, whiteness 52% ISO, put in a polyethylene plastic bag and put it in a water bath for hydrogen peroxide bleaching, the bleaching chemicals added are as follows: urea 15kg / ton pulp, EDTA 5kg / ton pulp, H 2 o 2 40kg / ton of pulp, 20kg / ton of sodium hydroxide, 20kg / ton of sodium silicate, pulp concentration 25wt%, bleaching temperature 80°C, bleaching time 2.0h, bleached pulp brightness 79%ISO. When no urea is added in the bleaching process and other chemicals are the same, the whiteness of the obtained bleached pulp is 76.8% ISO. The physical strength of the bleached pulp obtained after adding urea during bleaching is basically the same as that of the control pulp without adding urea.
Embodiment 3
[0019]Pine CTMP unbleached pulp, whiteness 48% ISO, put in a polyethylene plastic bag and put it in a water bath for hydrogen peroxide bleaching, the bleaching chemicals added are as follows: urea 15kg / ton pulp, EDTA 5kg / ton pulp, H 2 o 2 50kg / ton pulp, sodium hydroxide 24kg / ton pulp, sodium silicate 18kg / ton pulp, pulp concentration 25wt%, bleaching temperature 75°C, bleaching time 2.0h, pulp brightness after bleaching 75% ISO. When no urea is added in the bleaching process and other medicines are the same, the whiteness of the obtained bleached pulp is 73% ISO. The physical strength of the bleached pulp obtained after adding urea during bleaching was basically the same as that of the control pulp without adding urea.
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