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
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[0042] The invention provides an esterification grade pulp and a preparation method thereof, including the following steps:
[0043] Immerse the cellulose raw material in a combination of one or more of biological enzymes, sodium sulfite and sodium bisulfite;
[0044] The impregnated cellulose raw material is subjected to steam pre-hydrolysis 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-hydrolyzed product is subjected to sulphate cooking to obtain a slurry after cooking. The amount of alkali used in the sulphate cooking of the medicine is 4%-30% of the absolute dry mass of the pre-hydrolyzed product. The degree of sulfidity is 0-40%, the liquid ratio of the sulphate cooking is 1:(3-10), the temperature of the sulphate cooking is 80℃~200℃, and the time to heat up to the sulphate cooking tempera...
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[0068] Example 1
[0069] 1) Preparation: Cut the bamboo into small bamboo segments with a length of 2 cm, a width of 0.5 cm and a thickness of 1 cm, and then immerse the obtained small bamboo segments in a mixture of white rot fungi, sodium sulfite and sodium bisulfite for 24 hours. The total mass accounts for 1% of the absolute dry mass of Xiaozhu section, the immersion temperature is 15℃~25℃, and the liquid ratio is 1:1;
[0070] 2) Steam pre-hydrolysis: Put the impregnated bamboo section in a cooking pot, then heat it to 130°C under the pressure of 0.5±0.2MPa, keep it for 230min at this temperature, and the hydrolysis yield is 50%~95 %;
[0071] 3) Sulfate cooking: The amount of alkali used for sulphate cooking is 20% of the absolute dry mass of the hydrolysate obtained by the pre-hydrolysis, the sulfidity is 20%, and the liquid ratio is 1:4. The hydrolysate obtained from the pre-hydrolysis is combined with sulfate The cooking reagent is placed in the cooking pot, and then the ...
Example Embodiment
[0082] Example 2
[0083] The technical scheme of Example 1 was used to prepare vinegar-grade pulp. The difference from Example 1 is that the raw material used in this example is eucalyptus wood chips with a length of 50 mm, a width of 3 mm, and a thickness of 30 mm. The immersion time is 2 hours. The temperature is 90℃ and the liquid ratio is 1:5;
[0084] During the steam pre-hydrolysis process, the pressure is 0.46MPa, the temperature is 130°C, and the holding time is 230min;
[0085] In the process of sulphate cooking, the amount of alkali used is 30%, the degree of sulfidity is 40%, the liquid ratio is 1:30, the temperature is raised to 200℃ in 200min, the pressure is 8MPa, and the holding time is 20min;
[0086] In the process of deconstructing, screening and washing, the deconstructing time is 50min, the inlet pressure for screening is 500kpa, the pressure difference is 200kpa, and the inlet pressure for washing is 2kpa;
[0087] In the bleaching process, the mass concentration ...
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