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Full-closed zero discharge oxidizing pulping process and its preparation method

A clean pulping and zero-emission technology, applied in pulping of cellulose raw materials, modification of pulp properties, post-treatment of cellulose pulp, etc., can solve the problem of not controlling pollution from the source, and achieve energy saving, water saving, product cost, The effect of reducing product cost

Inactive Publication Date: 2008-09-24
梅秀泉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As of March 2002, there is no one in the world that does not use acid and alkali delignification, and no one completely bans acid, alkali and chlorine, which shows that the above invention does not control pollution from the source

Method used

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  • Full-closed zero discharge oxidizing pulping process and its preparation method
  • Full-closed zero discharge oxidizing pulping process and its preparation method
  • Full-closed zero discharge oxidizing pulping process and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Take 100kg of cotton stalks and remove the pods and calyx with a cracking machine, cut them into 5cm long and 1.5cm thick materials with a molding rate of 98%, crack them into velvet with a roller-press cracking machine, remove dust by wind, remove pith core, and sieve out impurities , after washing with circulating water, use a screw conveyor to transport it into an oxidation reaction kettle with automatic stirring, the reaction temperature is 60°C, the pH value in the kettle is 2.5, add 0.02kg of magnesium carbonate and 0.01kg of dimethyldioxirane (DMD), stirring speed 60 times / min, add H after 0.5h 2 o 2 Solution, control its weight percent concentration at 0.2, add and stir to accelerate 80 times / min, the temperature is 80 ℃, after 1 hour, observe that the material in the kettle is soaked and the softness rate reaches 98%, and the material in the kettle changes from dark yellow to light white. For materials with a whiteness of 48-52° (hereinafter referred to as whi...

Embodiment 2

[0069] With the original slurry 100kg in the embodiment 1, send into mill evenly and continuously with the screw feeder, in the first grinding process, add dropwise the H that the weight percent concentration that prepares earlier is 1.5 2 o 2 , the dripping amount by weight and the slurry ratio are 1:0.12, mixed with the slurry, the mill speed is 1300 times / min, the mill gap is adjusted to 0.15-0.1mm, the temperature is 60°C, and the slurry concentration is by weight 12-15%, pH value 3.8, observed pulp whiteness 65-75°; add ozone with a volume molar concentration of about 10umol / L dropwise in the second mill, the applied pressure is 0.4MPa, the speed is 1300 times / min, and the mill gap Adjust to 0.1mm, temperature 80°C, pulp concentration 12-15% by weight, pH value 3.8, mill with pulp for 0.5-1h, whiteness should be 75-86°, enter conventional fine sieve, purification, rotary screen Thickening, beating, pulp storage process system, if whitening is required, it can be repeated...

Embodiment 3

[0071] Repeat the same procedure as in Example 1, but replace magnesium carbonate with the same weight of magnesium sulfate to obtain the original slurry.

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Abstract

The object of the present invention is to provide a fully-closed, zero discharging and clean oxidizing pulping process and the preparation method thereof. In accordance with the present invention, it employs active oxygen free radicals generated by electron reduction reaction of molecular oxygen in an ion reactor to transform and separate lignin, to change chromophoric groups in the intercellular space and to obtain paper pulp. The conventional pulping technologies which use harmful polluting chemicals such as acid, alkaline, chlorine, anthraquinone and so on are basically changed in the present invention. The cooking and bleaching process, which generate severe pollution, can be avoided. The abundant annually grown fiber materials can be utilized in this process, and water and energy can be saved. The present invention can reduce production cost and have excellent social, economic and environmental benefits.

Description

field of invention [0001] The invention discloses a fully-enclosed zero-emission oxidation clean pulping process and a preparation method thereof, and more specifically relates to a fully-enclosed self-circulation without acid, alkali, chlorine, anthraquinone, no cooking, no bleaching, Zero-emission, pollution-free clean pulping method. Background of the invention [0002] Today's long-term shortage of papermaking raw materials does not refer to a certain region but to the global papermaking industry. Forests are the lungs of life on earth. In addition to conserving water sources, preventing soil erosion, and regulating climate, forests can also absorb carbon dioxide and release oxygen. Forests not only have ecological value but also economic value. However, the world is currently growing at an annual rate of 700×10 8 m 2 The speed decreases, and the tropical rainforest is 50×10 per minute 4 m 2 If the deforestation continues without strict control, 40 years later, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C3/00D21C9/147D21C3/22D21C9/00
CPCD21C9/004D21C3/22
Inventor 梅秀泉谢来苏
Owner 梅秀泉