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Masson pine dissolving pulp and production method thereof

A production method, the masson pine technology, is applied in the field of cellulose pulp, which can solve the problems that dissolving pulp cannot meet, and achieve the effects of easy control of product quality, less production, and easy handling

Active 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

At present, the amount of dissolving pulp produced from cotton linters is far from meeting the needs in the fields of textile dissolving pulp, nitrification dissolving pulp, acetic acid dissolving pulp, and cellulose ether

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] After the masson pine wood chips are put into the cooking pot, they are heated to 160°C with steam in 25 minutes for steam pre-hydrolysis, and kept at the highest temperature until the pre-hydrolysis P-factor reaches 400. The pre-hydrolyzed wood chips are filled with cooking liquid at 135~145℃ in the cooking pot to neutralize the acidic substances produced by the pre-hydrolysis and perform primary cooking of the wood chips. The cooking liquid used in this step is the fifth black liquor described later The mixture of black liquor, commercial alkali and alkali sulfide in the tank has a sulfidity of 15%, and the effective alkali dosage calculated by sodium oxide is 7% of the weight of the dry wood chips. Use the cooking liquor at 145~170℃ to replace the cooking liquor in the wood chips after the primary cooking operation. The cooking liquor below 100°C enters the first black liquor tank, and the cooking liquor not lower than 100°C enters the second black liquor tank. , The ...

Embodiment 2

[0029] After the masson pine wood chips are put into the cooking pot, they are heated to 175°C with steam in 40 minutes for steam pre-hydrolysis, and kept at the highest temperature until the pre-hydrolysis P-factor reaches 650. The pre-hydrolyzed wood chips are filled with cooking liquid at 135~145℃ in the cooking pot to neutralize the acidic substances produced by the pre-hydrolysis and perform primary cooking of the wood chips. The cooking liquid used in this step is the fifth black liquor described later The mixed solution of the black liquor in the tank and the caustic soda obtained during the alkali recovery process has a sulfidity of 30%, and the effective alkali dosage calculated by sodium oxide is 10% of the weight of the dry wood chips. Use the cooking liquor at 145~160℃ to replace the cooking liquor in the wood chips after the primary cooking operation. The cooking liquor below 100°C enters the first black liquor tank, and the cooking liquor not lower than 100°C enter...

Embodiment 3

[0031] After the masson pine wood chips are put into the cooking pot, the temperature is raised to 170°C with steam in 35 minutes, and the steam pre-hydrolysis is performed, and the heat is kept at the highest temperature until the pre-hydrolysis P-factor reaches 500. The pre-hydrolyzed wood chips are filled with cooking liquid at 135~145℃ in the cooking pot to neutralize the acidic substances generated by the pre-hydrolysis and perform primary cooking of the wood chips. The cooking liquid used in this step is the second black liquor described later The mixed liquid of the black liquor in the tank and the caustic soda obtained in the alkali recovery process has a sulfidity of 22%, and the effective alkali dosage calculated by sodium oxide is 8% of the weight of the dry wood chips. Use the cooking liquor at 145~168℃ to replace the cooking liquor in the wood chips after the primary cooking operation. The cooking liquor below 100℃ enters the first black liquor tank, and the cooking...

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Abstract

The invention discloses a masson pine dissolving pulp and a production method thereof, wherein the masson pine dissolving pulp is prepared after the steam prehydrolysis, sulfate cooking, two stages of oxygen delignification and D0EoPD1 bleaching of masson pine pieces, the whiteness is not less than 89%, the alpha cellulose is not less than 91%, the pentosan is not higher than 3%, 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 masson pine dissolving pulp comprises the following stepsthat: the masson pine 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 to obtain the pulp; the pulp undergoes the D0EoPD1 bleaching after two stages of oxygen delignification; and after the bleaching, the pulp is washed, dried and processed into the masson pine dissolving pulp.

Description

Technical field [0001] The invention relates to a cellulose pulp, in particular to a masson pine dissolving pulp. The invention also relates to a production method of cellulose pulp, in particular to a masson pine 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 the removal of lignin and hemicellulose during the pulping process. Only cellulose is retained. Therefore, the early dissolving pulp was produced from cotton linters with high cellulose content. Due to the rapid development of the social economy, the people's living standards continue to improve, and the consumption of resources is also growing rapidly, especially the consumption of raw materials in the textile industry, viscose, cellulose and nitrification production. At present, the quantity of dissolving pulp prepared from cott...

Claims

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Application Information

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IPC IPC(8): D21H11/00D21C1/02D21C3/02D21C9/14D21C9/153D21C9/16D21C11/04
Inventor 马乐凡周鲲鹏徐远梅万政黄百文徐应盛屈琴琴周万勇汪芳
Owner 湖南骏泰新材料科技有限责任公司
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