Method for reducing yellowing value of sulfonated chemimechanical pulp paper by adopting alpha-amylase pretreatment
A sulfonation chemical and pretreatment technology, which is applied in chemical/chemical mechanical pulp, microbial/enzymatic cellulose treatment, fiber raw material treatment, etc., can solve the problems of high yellowing value and low whiteness, and achieve easy solution The effect of returning yellow, improving whiteness and reducing yellow returning value
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[0020] Example 1
[0021] A method for reducing the yellowing value of sulfonated chemical mechanical pulp paper by pretreatment with α-amylase, the operation steps are as follows:
[0022] (1) α-amylase pretreatment: take 20g of dry bamboo sulfonated chemical mechanical pulp (SCMP), the amount of α-amylase is 8IU / g dry pulp, set the treatment time to 15min, adjust pH=5 with phosphate buffer , the treatment temperature is 50°C, and the slurry concentration is 10wt%.
[0023] (2) Chelation treatment: Step (1) Prepare the slurry with a dry pulp mass of 10g, a pulp concentration of 10wt%, an EDTA dosage of 0.3wt% relative to the dry pulp, a pH of 3, a temperature of 60°C, and a time of 60 minutes.
[0024] ⑶ Hydrogen peroxide bleaching:
[0025] ① One stage bleaching with hydrogen peroxide: Step ⑵ The absolute dry pulp quality of the prepared slurry is 10g, and the pulp concentration is 20wt%. 2 o 2 The dosage is 2wt%, the dosage of NaOH is 1wt%, the NaOH 2 SiO 3 The dosage...
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[0033] Example 2
[0034] A method for reducing the yellowing value of paper by pretreating sulfonated chemical mechanical pulp with α-amylase, the operation steps are as follows:
[0035] (1) α-amylase pretreatment: take 20g of dry bamboo sulfonated chemical mechanical pulp (SCMP), the dosage of α-amylase is 5IU / g of dry pulp, set the treatment time to 10min, and adjust pH=8 with phosphate buffer , the treatment temperature is 60°C, and the slurry concentration is 10wt%.
[0036] (2) Chelation treatment: Step (1) Prepare the slurry with a dry pulp mass of 10g, a pulp concentration of 10wt%, an EDTA dosage of 0.3wt% relative to the dry pulp, a pH of 3, a temperature of 60°C, and a time of 60 minutes.
[0037] ⑶ Hydrogen peroxide bleaching:
[0038] ① One stage bleaching with hydrogen peroxide: Step ⑵ The absolute dry pulp quality of the prepared slurry is 10g, and the pulp concentration is 20wt%. 2 o 2 The dosage is 2wt%, the dosage of NaOH is 1wt%, the NaOH 2 SiO 3 The ...
Example Embodiment
[0046] Example 3
[0047] A method for reducing the yellowing value of paper by pretreating sulfonated chemical mechanical pulp with α-amylase, the operation steps are as follows:
[0048] ⑴α-amylase pretreatment: take 20g of dry bamboo sulfonated chemical mechanical pulp (SCMP), the dosage of α-amylase is 10IU / g dry pulp, set the treatment time to 20min, and adjust pH=7.5 with phosphate buffer , the treatment temperature is 40°C, and the slurry concentration is 10wt%.
[0049](2) Chelation treatment: Step (1) Prepare the slurry with a dry pulp mass of 10g, a pulp concentration of 10wt%, an EDTA dosage of 0.3wt% relative to the dry pulp, a pH of 3, a temperature of 60°C, and a time of 60 minutes.
[0050] ⑶ Hydrogen peroxide bleaching:
[0051] ① One stage bleaching with hydrogen peroxide: Step ⑵ The absolute dry pulp quality of the prepared slurry is 10g, and the pulp concentration is 20wt%. 2 o 2 The dosage is 2wt%, the dosage of NaOH is 1wt%, the NaOH 2 SiO 3 The dosa...
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