Clean hydroxyl radical pulping method

A clean pulping and free radical technology, applied in the field of pulping and papermaking, can solve the problems of high energy consumption, low brightness and high alkali consumption, and achieve the effect of low equipment requirements and high brightness

Inactive Publication Date: 2017-09-12
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a kind of hydroxyl radical clean pulping method, adopts the improved alkaline Fenton reaction to produce hydroxyl radical pulping, is a kind of clean pulping technology; Solve the pulping process energy consumption is high, alkali consumption is high, The problem of low brightness, so that the pulp has a higher brightness without bleaching, and achieves a good effect of oxygen-alkali pulping

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] After the bagasse raw material is washed and dehydrated in a section of countercurrent with clear water through a washing machine, it is sent to a stirrable sealed cooking device for cooking; the cooking conditions are: the pulp concentration mass ratio is 10%, and the NaOH consumption is 30% of the absolute dry mass of the bagasse raw material. CoSO 4 The dosage is 0.01% of the absolute dry mass of bagasse raw material, H 2 o 2 The dosage is 10% of the absolute dry mass of bagasse raw material and added at one time. The cooking temperature is 90°C and the cooking time is 2 hours. The bagasse is to be cooked for cooking, and the good pulp is to be bleached.

[0020] The fine pulp yield of the pulp prepared in this example was 50.55%, the pulp viscosity was 750 mL / g, the kappa number was 18.4, and the brightness was 50.6%ISO.

Embodiment 2

[0022] The dilute black liquor that the bagasse raw material produces with embodiment 1 is carried out after 1 section of countercurrent washing dehydration, sends into the sealed cooking equipment that can stir and cooks; Cooking condition is: slurry concentration mass ratio 13%, NaOH consumption is the absolute dry weight of bagasse raw material 18% of CoSO 4 The dosage is 0.05% of the absolute dry mass of bagasse raw material, H 2 o 2 The dosage is 20% of the absolute dry weight of bagasse raw material and added in 2 times, the cooking temperature is 60°C, 50% is added before cooking, the remaining 50% is added after cooking for 1 hour, and the cooking time is continued for 5 hours; after cooking, the obtained pulp The raw materials are washed, sorted and screened according to the traditional process route, and the bagasse is recovered and mixed into the bagasse to be cooked for cooking, and the good pulp is to be bleached.

[0023] The fine pulp yield of the pulp prepare...

Embodiment 3

[0025] The bagasse raw material is washed and dehydrated in 2 sections with clear water through a washing machine, and then sent to a stirrable sealed cooking device for cooking; the cooking conditions are: the slurry concentration mass ratio is 15%, and the NaOH consumption is 21% of the absolute dry mass of the bagasse raw material. Cooking temperature 70°C, CoSO 4 The dosage is 0.08% of the absolute dry mass of bagasse raw material, H 2 o 2 The dosage is 30% of the absolute dry mass of bagasse raw material and added in 3 times. Add 25% at the beginning of cooking, add 25% after cooking for 1 hour, add the remaining 50% after cooking for 2 hours, and cook for 4 hours. After cooking, The obtained pulp is washed, selected, and screened according to the traditional process route, and the pulp is recovered and mixed into the bagasse to be cooked for cooking, and the good pulp is directly beaten for papermaking.

[0026] After the countercurrent washing liquid is collected, it ...

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Abstract

The invention discloses a clean hydroxyl radical pulping method, and belongs to the field of pulping and papermaking. The method comprises the following steps: taking bagasse as a raw material, and utilizing Fenton reaction under an improved alkali condition to generate hydroxyl radical for pulping. Compared with an oxygen-alkali pulping method, the method has the advantages that the yield is equivalent, and the degree of whiteness is improved by 2% ISO to 5% ISO under a condition that Kappa values are similar; compared with a caustic soda method, the method disclosed by the invention has the advantages that the yield of paper pulp is higher, the degree of whiteness is improved by 10 to 20% ISO under the condition that the Kappa values are similar, and the viscosity is improved by 50 to 200 mL/g.

Description

technical field [0001] The invention relates to a hydroxyl radical cleaning pulping technology, which belongs to the technical field of pulping and papermaking. Background technique [0002] As an industry that consumes a lot of resources such as energy, wood and water, papermaking has large investment, high energy consumption and serious pollution. With the development of the economy, the awareness of environmental protection in various countries is getting stronger and stronger, and the requirements for environmental protection are getting higher and higher. At the same time, my country's paper consumption is increasing, and the output of paper and cardboard is also increasing. The need for sustainable development of the paper industry. Therefore, it is of great significance to protect forest resources, develop non-wood resources, improve the performance of non-wood pulp, reduce environmental pollution in the pulping process, and promote the sustainable development of my c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00D21C3/02D21C3/00D21C11/04D21C11/00
CPCD21C5/00D21C3/006D21C3/022D21C11/0028D21C11/04
Inventor 孙兵梁星刘玉新张宝尚振
Owner KUNMING UNIV OF SCI & TECH
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