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

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

Inactive Publication Date: 2012-07-25
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

Experimental program
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Effect test

Embodiment 1

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

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

[0020] 1) The fiber raw material is subjected to pretreatment operations of cutting grass, dust removal, and water washing. The washing water removes solid impurities and then returns to the washing equipment for reuse. The solid impurities separated from the washing water are used to make fertilizer.

[0021] 2) Alkali-hydrogen peroxide cooking of the pretreated fiber material: cooking liquor ratio 1:3, add 260kg NaOH, 150kg hydrogen peroxide (concentration 30wt%), and the above cooking catalyst, normal temperature and pressure Cook for 2.5 hours.

[0022] 3) Squeeze the slurry after the cooking, the obtained cooking residue is white liquor. After removing the sol...

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, includes:

[0027] 1) The fiber raw material is subjected to pretreatment operations of cutting grass, dust removal, and water washing. The washing water removes solid impurities and then returns to the washing equipment for reuse. The solid impurities separated from the washing water are used to make fertilizer.

[0028] 2) Alkali-hydrogen peroxide cooking on the pretreated fiber material: cooking liquor ratio 1:5, adding 280kg NaOH, 190kg hydrogen peroxide (concentration 30wt%), and the above-mentioned cooking catalyst, cooking temperature control At 50°C, 50 minutes each time.

[0029] 3) Squeeze the slurry after the cooking, the obtained cooking residue is white liquor. A...

Embodiment 3

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

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

[0034] 1) The fiber raw material is subjected to pretreatment operations of cutting grass, dust removal, and water washing. The washing water removes solid impurities and then returns to the washing equipment for reuse. The solid impurities separated from the washing water are used to make fertilizer.

[0035] 2) Alkali-hydrogen peroxide cooking of the pretreated fiber material: cooking liquor ratio 1:8, add 320kg of NaOH, 260kg of hydrogen peroxide (calculated at a concentration of 30wt%) and the above-mentioned cooking catalyst per absolute dry pulp. The cooking temperature is controlled at 100°C, 90 minutes each time.

[0036] 3) Squeeze the slurry after the cooking, the obtained...

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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 cookingresidual 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 specifically relates to a cooking catalyst based on an alkali-hydrogen peroxide method and a clean pulping process. Background technique [0002] For a long time, my country's paper industry has been using non-wood fibers as the main raw material, of which straw pulp accounts for about 80%. However, wheat straw occupies a very important position in straw pulp papermaking due to its rich resources and low price. Wheat (rice) straw pulping usually adopts caustic soda method, sulphate method or ammonia method, among which caustic soda method is the most common: wheat (rice) straw raw materials, caustic soda, and cooking agent are heated and pressurized in the steaming ball for a period of time. The lignin, polysaccharides, pectin, protein and other complex components in the raw materials are dissolved in the caustic soda solution, and the cellulose is separated from it to form pulp fibers. Howe...

Claims

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Application Information

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Patent Type & Authority Patents(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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