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Acetate-grade pulp and preparation method thereof

A technology of vinegaring and pulping, applied in pulp bleaching, pulping with inorganic alkali, raw material pretreatment, etc., can solve the problems of unstable quality, incomplete qualification, and deterioration of reaction performance, so as to achieve easy process control and high cost , high environmental protection and economic value

Active Publication Date: 2013-08-14
JINAN SHENGQUAN GROUP SHARE HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cellulose acetate wood and bamboo pulp (dissolving pulp) obtained by these methods is not completely qualified, and the "three high" indicators of high viscosity, high methyl fiber and high whiteness cannot all meet the requirements. Other quality indicators, such as: ash, Some parts of iron, pentose, etc. are not well controlled, especially the poor reactivity, which cannot meet the production requirements of acetate fiber
Moreover, alkali refining (alkali extraction) deteriorates the reaction performance, increases the difficulty of bleaching washing and alkali recovery, and the quality of ash and iron is unstable.

Method used

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  • Acetate-grade pulp and preparation method thereof

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preparation example Construction

[0042] The invention provides an esterification grade pulp and a preparation method thereof, comprising the following steps:

[0043] impregnating the cellulose raw material in a composition of one or more of biological enzymes, sodium sulfite and sodium bisulfite;

[0044] Perform steam pre-hydrolysis on the impregnated cellulose raw material to obtain a pre-hydrolyzed product, the temperature of the steam pre-hydrolysis is 100°C to 200°C, the pressure of the steam pre-hydrolysis is 0 MPa to 1.46 MPa, and the time of the steam pre-hydrolysis 60min~230min;

[0045] The pre-hydrolyzate is subjected to kraft cooking to obtain the cooked slurry. The amount of alkali used for the kraft-cooking Chinese medicine is 4% to 30% of the absolute dry mass of the pre-hydrolyzate, and the kraft-cooking Chinese medicine is The degree of sulfidation is 0-40%, the liquid ratio of the kraft cooking is 1: (3-10), the temperature of the kraft cooking is 80°C-200°C, and the time for heating to th...

Embodiment 1

[0069] 1) Preparation: Cut the bamboo into small bamboo sections with a length of 2cm, a width of 0.5cm, and a thickness of 1cm, and then place the obtained small bamboo sections in a mixture of white rot fungi, sodium sulfite and sodium bisulfite for 24 hours, white rot fungi and sodium sulfite The total mass of bamboo accounts for 1% of the absolute dry mass of small bamboo segments, the impregnation temperature is 15°C-25°C, and the liquid ratio is 1:1;

[0070] 2) Steam pre-hydrolysis: put the impregnated small bamboo segments in a cooking pot, then raise the temperature to 130°C under the pressure of 0.5±0.2MPa, keep it at this temperature for 230min, and the hydrolysis yield is 50%-95% %;

[0071] 3) Kraft cooking: the amount of alkali used for sulfate cooking is 20% of the absolute dry mass of the hydrolyzate obtained by pre-hydrolysis, the degree of sulfidation is 20%, and the liquid ratio is 1:4. The hydrolyzate obtained by pre-hydrolysis and sulfate Place the boiled...

Embodiment 2

[0083] Adopt the technical scheme of embodiment 1 to prepare vinegar grade pulp, different from embodiment 1, the raw material that adopts in the present embodiment is long 50mm, wide 3mm, thick 30mm eucalyptus wood chips, the time of immersion is 2h, the impregnated The temperature is 90°C, and the liquid ratio is 1:5;

[0084] During the steam prehydrolysis process, the pressure is 0.46MPa, the temperature is 130°C, and the holding time is 230min;

[0085] During the sulfate cooking process, the amount of alkali used is 30%, the degree of sulfidation is 40%, the liquid ratio is 1:30, the temperature is raised to 200°C in 200 minutes, the pressure is 8MPa, and the holding time is 20 minutes;

[0086] In the process of decompression, screening and washing, the decompression time is 50min, the inlet pressure of screening is 500kpa, the pressure difference is 200kpa, and the inlet pressure of washing is 2kpa;

[0087] During the bleaching process, the mass concentration of NaOH...

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Abstract

The invention provides acetate-grade pulp and a preparation method thereof. According to the preparation method, firstly, a raw cellulose material is impregnated in one or more combinations of bio-enzyme, sodium sulfite and sodium bisulfite to enable part of lignin to dissolve out, the structure of the raw material is loose, and a good condition is created for follow-up processes. After impregnation in the sodium sulfite or the sodium bisulfite, lignin condensation caused by strong prehydrolysis is avoided effectively, the content of pentosan is reduced, through control of sulfate digestion conditions in the follow-up processes, the acetate-grade pulp obtained through the method is high in methyl cellulose content, high in viscosity and easy to bleach, damage of bleaching to the methyl cellulose and the viscosity is reduced, the quality of finished products is guaranteed, and high viscosity, high methyl cellulose and high brightness are provided. According to the method, alkali extraction is not needed during bleaching, the permeation and the uniformity are improved, and a good reactivity is provided.

Description

technical field [0001] The invention relates to the technical field of cellulose acetate, in particular to an acetate grade pulp and a preparation method thereof. Background technique [0002] Acetified pulp is the basic raw material for the production of cellulose acetate. Cellulose acetate is the product of some hydroxyl groups in cellulose esterified by acetic acid or acetic anhydride. It has the characteristics of toughness, transparency and good gloss. According to the different products, cellulose acetate can be divided into diacetate spinning grade cellulose acetate, diacetate plastic grade cellulose acetate and triacetate cellulose. Diacetate spinning grade cellulose acetate is an internationally recognized non-toxic and harmless product that has not been found as a substitute material so far. Its most important and main use is as a filter material, especially for cigarette filters. In addition, it is used as medical filter material, such as blood filter material, e...

Claims

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Application Information

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IPC IPC(8): D21B1/02D21C1/02D21C3/02D21C9/14
Inventor 余锦山江成真赵兴国孙智华许日鹏
Owner JINAN SHENGQUAN GROUP SHARE HLDG
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