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Oxygen delignification and bleaching integration paste preparing method and device for realizing the same method

A technology for oxygen delignification and pulping, which is applied to pulping of cellulose raw materials, pulp bleaching, pulping with organic solvents, etc. , the effect of protecting the ecological environment

Inactive Publication Date: 2008-01-16
梅秀泉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] As we all know, the serious problems facing the pulp and paper industry in the world today are: backward equipment and technology, serious pollution, and shortage of raw materials
After the inventor searched these patents in detail, in the pretreatment of raw materials and softening raw materials, cooking, and bleaching processes, the pollution process of acid, alkali, and chlorine has not been fundamentally eliminated. Oxygen is only used as an auxiliary agent. It is still some ordinary equipment in the traditional old craft, which consumes electricity, water and BOD 5 、COD Cr still high
Some countries advocate alkali recovery, but they face large investment, high cost, and low recovery rate, which cannot be accepted by manufacturers. Besides, alkali recovery is only a temporary solution to the symptoms, not the root cause. How can the pulp and paper industry solve this problem? Three big questions have been a big problem for the industry for more than 20 years

Method used

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  • Oxygen delignification and bleaching integration paste preparing method and device for realizing the same method
  • Oxygen delignification and bleaching integration paste preparing method and device for realizing the same method

Examples

Experimental program
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Embodiment 1

[0033] Method embodiment 1: Including the following steps (please refer to Figure 1):

[0034] (1) Softening treatment: The crude fiber sent from the material preparation section is pretreated by the conveyor belt into the material preparation room. Wash and dehydrate with 60~80℃ ion-free water; use screw feeder to feed the material into oxidation reactor, and add 0.1% dimethyl sulfoxide; start rotary electron accelerator and electric stirrer, stirring speed is 0.8 r / s, the stable temperature of softened material is 120℃. The slurry concentration is 12-25%, and the rotation speed of the agitator is 0.5-1 r / s, the temperature of the softened material is controlled to be 100-130℃ by injecting steam. then:

[0035] (2) Air replacement: After opening the nitrogen for 3 minutes, proceed to the next step:

[0036] (3) Oxidation reaction: Open the pre-prepared composite oxygen pressure valve, add magnesium sulfate with a concentration of 0.1%, sodium silicate 0.2% and a concentration o...

Embodiment 2

[0043] The steps are the same as in Example 1, with the following different process parameters:

[0044] In the softening treatment step (1): Wash and dehydrate with 80℃ ion-free water; the stirring speed is 1 r / s, the stable temperature of softened material is 130℃.

[0045] In the oxidation reaction step (3): add a concentration of 0.01% ferric oxide and a concentration of 0.2% hydrogen peroxide (H 2 O 2 ) Cellulose protective agent, sodium polyphosphate oxygen stabilizer with a concentration of 0.5%, sodium peroxycarbonate oxygen stabilizer with a concentration of 0.2%, reacted for 60 minutes, and the pH value is 4.8.

[0046] In the separation of the slurry and gas and the post process (4): the slurry is washed repeatedly in deionized water at 80 DEG C with a washer to obtain a slurry with a slurry rate of 75.1% and a brightness of 76.5% ISO.

Embodiment 3

[0048] The steps are the same as in Example 1, with the following different process parameters:

[0049] In the softening treatment step (1): Wash and dehydrate with 60℃ ion-free water; the stirring speed is 0.5 r / s, the stable temperature of softened material is at 100℃;

[0050] In the air replacement step (2): Turn on the nitrogen for 2 minutes.

[0051] In the oxidation reaction step (3): add 0.1% magnesium sulfate, 0.2% sodium silicate and 0.5% hydrogen peroxide (H 2 O 2 ) Cellulose protective agent, dimethyl sulfoxide oxygen stabilizer with a concentration of 0.5%, reaction for 12 minutes, pH value of 3.8.

[0052] In the separation of the slurry and the subsequent step (4), the slurry was washed twice with a slurry washer in non-ionized water at 60°C. A slurry with a pulp rate of 81.1% and a brightness of 84.2% ISO is obtained.

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Abstract

The invention discloses a pulping method integrating oxygen delignification and bleaching processes and a device for implementing the method. The inventive method integrates the boiling and bleaching processes which are serious pollution sources, and is carried out in an oxidation reaction kettle, thereby eliminating pollution sources and realizing both delignification and bleaching. Additionally, the method omits the washing process, thereby saving energy and water by 50 percent. The inventive device has a combined stainless steel body and a rotating electron accelerator for transferring electrons in organic solutions to supply the electrons to triplet oxygen. The HOO of superoxide anion free radical (O2- / HOO), produced in the oxidation reaction kettle, can directly penetrate the intercellular tissue of plant and thus soften the plant by breaking the delocalized pi bonds on the aromatic ring and side chain, allowing the decomposition and dissolution of lignin. The invention is characterized in clean pulping.

Description

Technical field [0001] The invention relates to an oxygen delignification and bleaching integrated pulping method and a device used for realizing the method. Background technique [0002] As we all know, the serious problems facing the pulp and paper industry in the world today are: backward equipment and technology, serious pollution, and shortage of raw materials. These three problems are not a single country but all the pulp and paper industries in the world. If they are not resolved as soon as possible, the pulp and paper industry will be overwhelmed by the green barriers of ecological and environmental protection. Due to the serious pollution in this industry, the huge resource advantages in agriculture and forestry cannot be used. In recent years, scientists and people with lofty ideals in the industry have made great efforts, made every effort to innovate, and made unremitting efforts to control the pollution problem in the industry. But so far, pollution has not been fund...

Claims

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Application Information

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IPC IPC(8): D21C3/22D21C9/147D21C3/20D21C9/16D21C9/153D21H17/05D21H17/14D21H17/63D21H17/66D21C9/02D21C9/18D21C7/00D21C7/06D21C7/12
Inventor 梅秀泉
Owner 梅秀泉