Eucalyptus dissolving pulp and production method thereof

A production method and technology of dissolving pulp, which is applied in the field of cellulose pulp, can solve the problems of difficult wastewater treatment and large environmental pollution, and achieve the effects of small environmental impact, improved reaction performance, and low pollution load

Inactive Publication Date: 2012-06-13
湖南骏泰新材料科技有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above invention adopts the bleaching process containing elemental chlorine, the waste water is difficult to treat, and the environment is polluted greatly.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] After the eucalyptus wood chips were loaded into the cooking pot, the temperature was raised to 160°C with steam for 25 minutes to carry out steam pre-hydrolysis, and kept at the highest temperature until the pre-hydrolysis P-factor reached 300. After the pre-hydrolysis operation, the wood chips are filled with cooking liquid at 135°C to 145°C in the cooking pot to neutralize the acidic substances produced by the pre-hydrolysis and perform primary cooking on the wood chips. The cooking liquid used in this step is the fifth black The mixed solution of black liquor, commercial alkali and sulfurized alkali in the liquid tank has a degree of sulfidation of 30%, and the effective amount of alkali calculated by sodium oxide is 10% of the weight of dry wood chips. Use the cooking liquid at 145°C to 170°C to replace the cooking liquid in the wood chips after the primary cooking operation, the cooking liquid below 100°C enters the first black liquor tank, and the cooking liquid n...

Embodiment 2

[0028]After the eucalyptus wood chips were loaded into the cooking pot, the temperature was raised to 175°C with steam for 40 minutes to carry out steam prehydrolysis, and kept at the highest temperature until the prehydrolysis P-factor reached 800. After the pre-hydrolysis operation, the wood chips are filled with cooking liquid at 135°C to 145°C in the cooking pot to neutralize the acidic substances produced by the pre-hydrolysis and perform primary cooking on the wood chips. The cooking liquid used in this step is the second black The black liquor in the liquid tank and the caustic soda mixture obtained in the alkali recovery process have a degree of sulfidation of 15%, and an effective alkali dosage calculated by sodium oxide is 6% of the dry wood chip weight. Use the cooking liquid at 145°C to 160°C to replace the cooking liquid in the wood chips after the primary cooking operation, the cooking liquid below 100°C enters the first black liquor tank, and the cooking liquid n...

Embodiment 3

[0030] After the eucalyptus wood chips were loaded into the cooking pot, the temperature was raised to 167°C with steam for 35 minutes to carry out steam prehydrolysis, and kept at the highest temperature until the prehydrolysis P-factor reached 550. After the pre-hydrolysis operation, the wood chips are filled with cooking liquid at 135°C to 145°C in the cooking pot to neutralize the acidic substances produced by the pre-hydrolysis and perform primary cooking on the wood chips. The cooking liquid used in this step is the second black The black liquor in the liquid tank and the fifth black liquor tank and the mixed solution of caustic soda obtained in the recovery process of commercial alkali and alkali, the degree of sulfidation is 20%, and the effective alkali dosage calculated by sodium oxide is 8% of the weight of dry wood chips. %. Use the cooking liquid at 145°C to 168°C to replace the cooking liquid in the wood chips after the primary cooking operation, the cooking liqu...

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Abstract

The invention discloses a eucalyptus dissolving pulp and a production method thereof, wherein the eucalyptus dissolving pulp is prepared after the steam prehydrolysis, sulfate cooking, oxygen delignification and D0EoPD1 bleaching of eucalyptus pieces, the whiteness is not less than 88%, the alpha cellulose is not less than 94.5%, the pentosan is not higher than 3.0%, the dynamic viscosity is 9-25mPa s, the ash content is not higher than 0.1%, and the iron content is not higher than 15mg kg<-1>. The production method of the eucalyptus dissolving pulp comprises the following steps that: the eucalyptus pieces undergo the steam prehydrolysis, and the P- factor of the steam prehydrolysis is 300-800; the sulfate cooking is carried out after the steam prehydrolysis of the eucalyptus pieces to obtain the pulp; the eucalyptus chemical pulp undergoes the D0EoPD1 bleaching after the oxygen delignification; and after the bleaching, the pulp is washed, dried and processed into the eucalyptus dissolving pulp.

Description

technical field [0001] The present invention relates to a kind of cellulose pulp, especially relates to a kind of eucalyptus dissolving pulp, the invention also relates to a kind of production method of cellulose pulp, especially relates to a kind of production method of eucalyptus dissolving pulp. Background technique [0002] Ordinary chemical pulping is to remove lignin from plant fiber raw materials during the pulping process and retain cellulose and hemicellulose as much as possible; while dissolving pulp requires removal of lignin and hemicellulose during the pulping process, Only cellulose is retained, so early dissolving pulp was produced from cotton linters with a high cellulose content. Due to the rapid development of social economy and the continuous improvement of people's living standards, the consumption of resources has also increased rapidly, especially the consumption of raw materials in the fields of textile viscose, cellulose ether and nitration production...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H11/00D21C1/02D21C3/02D21C9/14D21C9/16D21C9/147D21C11/04
Inventor 马乐凡周鲲鹏徐远梅万政黄百文徐应盛蓝家良周万勇党佩
Owner 湖南骏泰新材料科技有限责任公司
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