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Alkali-hydrogen peroxide method-based cooking catalyst and clean pulping process

A hydrogen peroxide method and catalyst technology, applied in the field of papermaking, can solve problems such as complicated procedures, high cost, and failure to meet emission requirements, and achieve the effects of easy modularization, easy operation, and easy recycling

Inactive Publication Date: 2010-09-08
金永安 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods are often complex and costly, and sometimes even fail to meet emission requirements

Method used

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  • Alkali-hydrogen peroxide method-based cooking catalyst and clean pulping process
  • Alkali-hydrogen peroxide method-based cooking catalyst and clean pulping process

Examples

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Effect test

Embodiment 1

[0018] A cooking catalyst based on the alkali-hydrogen peroxide method is composed of: chelating agent EDTA 3kg, magnesium sulfate 4kg, sodium silicate 7kg, urea 16kg, sulfamic acid 25kg.

[0019] The clean pulping process based on the alkali-hydrogen peroxide method, as shown in Figure 1, the steps include:

[0020] 1) Carry out the pretreatment operations of grass cutting, dust removal, and water washing on the fiber raw materials. After the solid impurities are removed from the washing water, it is returned to the washing equipment for reuse. The solid impurities separated from the washing water are used to make fertilizers.

[0021] 2) Alkali-hydrogen peroxide cooking is carried out on the pretreated fiber raw material: the cooking liquid ratio is 1:3, and NaOH 260kg, hydrogen peroxide (30wt%) 150kg, and the above-mentioned cooking catalyst are added to each dry pulp, at normal temperature and pressure Boil for 2.5 hours.

[0022] 3) Squeeze pulp after cooking, and the ob...

Embodiment 2

[0025] A cooking catalyst based on the alkali-hydrogen peroxide method, consisting of: 5 kg of chelating agent DTPA, 5 kg of magnesium sulfate, 10 kg of sodium silicate, 20 kg of urea, and 32 kg of sulfamic acid.

[0026] The clean pulping process based on the alkali-hydrogen peroxide method, as shown in Figure 1, the steps include:

[0027] 1) Carry out the pretreatment operations of grass cutting, dust removal, and water washing on the fiber raw materials. After the solid impurities are removed from the washing water, it is returned to the washing equipment for reuse. The solid impurities separated from the washing water are used to make fertilizers.

[0028] 2) Alkali-hydrogen peroxide cooking is carried out to the pretreated fiber raw material: the cooking liquid ratio is 1:5, and NaOH 280kg, hydrogen peroxide (in terms of concentration 30wt%) 190kg, and the above-mentioned cooking catalyst are added to each dry pulp, and the cooking temperature is controlled At 50°C, 50 m...

Embodiment 3

[0032] A cooking catalyst based on the alkali-hydrogen peroxide method, composed of: chelating agent TMA-528kg, magnesium sulfate 8kg, sodium silicate 12kg, urea 25kg, sulfamic acid 40kg.

[0033] The clean pulping process based on the alkali-hydrogen peroxide method, as shown in Figure 1, the steps include:

[0034] 1) Carry out the pretreatment operations of grass cutting, dust removal, and water washing on the fiber raw materials. After the solid impurities are removed from the washing water, it is returned to the washing equipment for reuse. The solid impurities separated from the washing water are used to make fertilizers.

[0035] 2) Alkali-hydrogen peroxide cooking is carried out to the pretreated fiber raw material: the cooking liquid ratio is 1: 8, and NaOH320kg, hydrogen peroxide (in terms of concentration 30wt%) 260kg and the above-mentioned cooking catalyst are added for every dry pulp, and the cooking temperature is controlled at 100°C, 90 minutes each time.

[0...

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Abstract

The invention relates to an alkali-hydrogen peroxide method-based cooking catalyst and alkali-hydrogen peroxide method-based clean pulping process, which belong to the technical field of papermaking. The cooking catalyst mainly comprises the following raw materials in part by weight: 3 to 10 parts of chelant, 4 to 10 parts of magnesium sulfate, 7 to 15 parts of sodium silicate and 16 to 30 parts of urea; and the catalyst can lower the cooking temperature and pressure to enable that the cooking residual liquid keeps higher whiteness which brings convenience to cyclic utilization. The pulping process comprises the following step of: cooking the pretreated fiber raw materials by using alkali and hydrogen peroxide, wherein the cooking catalyst is added into the cooking liquor in cooking; the catalyst needed by each oven dry metric ton of pulp comprises 3 to 10 kg of the chelant, 4 to 10 kg of the magnesium sulfate, 7 to 15 kg of the sodium silicate and 16 to 30 kg of the urea. The cooking residual liquid obtained by the process has a yellowish white color, and can be returned to the cooking equipment for the next cooking after solid impurities are removed; and when the cooking residual liquid is circularly utilized, the rinsing cost of the pulp is not increased, and the cost is low in cyclic utilization, so the alkali-hydrogen peroxide method-based cooking catalyst and the alkali-hydrogen peroxide method-based clean pulping process are favorable for saving energy and reducing emission.

Description

technical field [0001] The invention belongs to the technical field of papermaking, and in particular relates to a cooking catalyst and a clean pulping process based on an alkali-hydrogen peroxide method. Background technique [0002] For a long time, my country's paper industry has always used non-wood fiber as the main raw material, of which straw pulp accounts for about 80%. Wheat straw occupies a very important position in straw pulp papermaking because of its advantages of rich resources and low price. Wheat (rice) straw pulping usually adopts caustic soda method, sulfate method or ammonia method, among which caustic soda method is the most common: wheat (rice) grass raw material, caustic soda, and cooking agent are heated in a steaming ball and pressurized for a period of time. Complex components such as lignin, polysaccharides, pectin, and protein in the raw materials are dissolved in the caustic soda solution, and the cellulose is separated from it to form pulp fibe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/26D21C3/00C05F7/02
CPCY02P20/10
Inventor 金永安杭涛张哲
Owner 金永安
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