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Microwave method for preprocessing pulping raw material

A pulping raw material and pretreatment technology, applied in the field of pulping and papermaking, can solve problems such as hazards, increased processing difficulty, and increased foaming of surfactants

Inactive Publication Date: 2005-11-16
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Anthraquinones are toxic and cause harm to the human body. The foaming properties of surfactants increase the difficulty of subsequent pulping and aggravate environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0012] Raw material sheet: poplar wood chips 800G (dry weight)

[0013] Microwave treatment conditions: 2450MHz; 650W; 3min

[0014] Cooking process conditions:

[0015] Method caustic soda method

[0016] Alkali consumption 22%

[0017] Maximum temperature 165°C

[0018] Holding time 30min

[0019] Liquid ratio 1:6

[0020] Bleaching process conditions

[0021] Method Hypochlorite single-stage bleaching

[0022] Chlorine 5%

[0023] Concentration 5%

[0024] Temperature 39°C

[0025] Cooking result:

[0026] Yield 55.20% (2.98% higher than untreated sample)

[0027] Potassium permanganate value 16.89 (2.70 lower than untreated sample)

[0028] Puree whiteness 29.38% (3.82% higher than untreated sample)

[0029] Bleaching result: whiteness 52.67% (3.75% higher than untreated sample)

[0030] Unbleached pulp hand-sheet properties: (beating degree 28.6°SR)

[0031] Quantitative 60.51g / m 2

[0032] Fracture length 4259m (14.78% higher than untreated sample)

[0...

example 2

[0035] Raw material sheet: pine wood 750G (dry weight)

[0036] Microwave treatment conditions: 2450MHz; 700W; 3min

[0037] Cooking process conditions:

[0038] Method Sulphate method

[0039] Alkali consumption 26%

[0040] Sulfur 25%

[0041] Maximum temperature 170°C

[0042] Holding time 60min

[0043] Liquid ratio 1:6

[0044] Bleaching process conditions:

[0045] Method Hypochlorite single-stage bleaching

[0046] Chlorine 5%

[0047] Concentration 5%

[0048] Temperature 39°C

[0049] Cooking result: yield 54.60% (3.60% higher than untreated sample)

[0050] Potassium permanganate value 20.36 (4.22 lower than untreated sample)

[0051] Puree whiteness 25.38% (3.98% higher than untreated sample)

[0052] Bleaching result: whiteness 49.66% (4.01% higher than untreated sample)

[0053] Unbleached pulp hand-sheet properties: (beating degree 38.66°SR)

[0054] Quantitative 60.27g / m 2

[0055] Fracture length 5683m (12.36% higher than untreated sample)

[...

example 3

[0058] Raw material: Reed 700G (dry weight)

[0059] Microwave treatment conditions: 2450MHz; 700W; 1.2min

[0060] Cooking process conditions:

[0061] Method caustic soda method

[0062] Alkali consumption 18%

[0063] Maximum temperature 160°C

[0064] Holding time 20min

[0065] Liquid ratio 1:6

[0066] Bleaching process conditions

[0067] Method Hypochlorite single-stage bleaching

[0068] Chlorine 5%

[0069] Concentration 5%

[0070] Temperature 39°C

[0071] Cooking result:

[0072] Yield 53.64% (3.98% higher than untreated sample)

[0073] Potassium permanganate value 7.82 (3.23 lower than untreated sample)

[0074] Puree whiteness 31.95% (4.88% higher than untreated sample)

[0075] Bleaching result: whiteness 71.81% (5.63% higher than untreated sample)

[0076] Unbleached pulp hand-sheet properties: (beating degree 27.02°SR)

[0077] Quantitative 60.11g / m 2

[0078] The fracture length is 3859m (8.96% higher than that of the untreated sample)

[...

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Abstract

The invention relates to a microwave pretreatment method of raw material for making pulp. It is characterized by that firstly, it utilizes microwave to make radiation treatment of material sheet of plant raw material for making pulp by traditional process. After the material sheet of plant raw material is treated by microwave radiation, the relatively-closed internal physical structure channel of plant raw material can be improved, it is favorable for quick and uniform penetration of chemicals for making pulp so as to raise pulp quality.

Description

technical field [0001] The invention relates to a technology for pretreating plant raw material sheets in pulp making, which is applied to the technical field of pulp and paper making by using plant fiber raw materials for pulp making. Background technique [0002] In the chemical treatment process of the traditional chemical method (including semi-chemical method and chemical mechanical method) pulping technology, the yield and quality of pulp are reduced due to the poor uniformity of contact and penetration between chemicals and plant materials. The currently used improvement method is the chemical method of adding additives, such as adding anthraquinone and surfactants, to strengthen the delignification chemical reaction of pulping and improve the penetration of chemicals. Anthraquinone is toxic and harmful to the human body, and the multi-foaming property of surfactant increases the difficulty of pulping subsequent treatment and aggravates environmental pollution. [00...

Claims

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Application Information

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IPC IPC(8): D21B1/02
Inventor 付建生袁世炬文琼菊邱先琴
Owner HUBEI UNIV OF TECH
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