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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

Inactive Publication Date: 2020-04-17
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, low brightness and high yellowing value restrict the development of high-yield pulp

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 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 is 1wt%, MgSO 4 Th...

Embodiment 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 dosage is 1wt%, MgSO...

Embodiment 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 dosage is 1wt%, MgSO 4 ...

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Abstract

The invention discloses a method for reducing the yellowing value of sulfonated chemimechanical pulp paper by adopting alpha-amylase pretreatment. According to the method, sulfonated chemimechanical pulp is used as a raw material, alpha-amylase is used for pretreating the pulp, and under the conditions that an enzyme dosage is 5-10 IU / g on the basis of absolute dry pulp, a pH value is 5-8, a temperature is 40-60 DEG C and treatment time is 10-20 min, the whiteness of the pulp can be improved, and the yellowing value of the pulp can be reduced. As the sulfonated chemimechanical pulp is pretreated through alpha-amylase, the whiteness of paper can be improved, and meanwhile, the yellowing value of the paper is reduced, so the application value of the sulfonated chemimechanical pulp is improved, and the application range of the sulfonated chemimechanical pulp is expanded. Compared with a pulping process without pretreatment, the method has the advantages that the consumption of hydrogen peroxide in a subsequent bleaching process is reduced, and the same bleaching effect can be achieved, so production efficiency is improved, and production cost is reduced.

Description

technical field [0001] The invention relates to the field of pulping and papermaking, in particular to a method for reducing the yellowing value of sulfonated chemical mechanical pulp paper by adopting alpha-amylase pretreatment. Background technique [0002] With the development of my country's economy, papermaking resources are increasingly in short supply, and bamboo resources are a good substitute for wood pulp in non-wood raw materials. my country's bamboo resources are abundant, and bamboo fiber is relatively good in non-wood fiber raw materials. For raw materials, it is a very good way to replace the shortage of papermaking resources with bamboo resources. High-yield pulp has low cost, high pulping yield, less pollution, and the pulp has the advantages of high opacity, bulk and good printability. In recent years, the development of high-yield technologies such as chemical thermomechanical pulp, alkaline hydrogen peroxide mechanical pulp and sulfonated chemical mechani...

Claims

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Application Information

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IPC IPC(8): D21C5/00D21C9/16D21C9/10D21H11/02
CPCD21C5/005D21C9/1005D21C9/1036D21C9/1042D21C9/163D21H11/02
Inventor 骆莲新张科蕾王绪崇袁晓君张胜王双飞
Owner GUANGXI UNIV
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