Preparation method of hollow and porous hybrid cell and bamboo dissolving pulp
A technology of miscellaneous cells and dissolving pulp, which is applied in pulp bleaching and pulping with inorganic alkali, etc. It can solve the problems of waste of liquid medicine, failure to improve the dissolution rate and quality of refined pulp, pulp loss and cost increase, etc.
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[0037] The invention provides a kind of preparation method of hollow, porous miscellaneous cell and bamboo dissolving pulp, and this method comprises the following steps:
[0038] (1) bamboo precooking, alkali cooking to remove part of lignin and hemicellulose; obtain material I;
[0039] (2) After the material I is washed to neutral, it is frozen to thawed to obtain the material II. The material II is dried until the water content is less than or equal to 10%, and the monodisperse and uniform heterogeneous mixture is obtained by mechanical extrusion or mechanical rolling and sieving. cells and bamboo fibrils;
[0040] (3) The miscellaneous cells are replaced with tert-butanol and then dried to obtain hollow and porous miscellaneous cells; the bamboo fibrils are bleached to obtain bamboo dissolving pulp.
[0041] The present invention can make the bamboo that has removed part of the hemicellulose and lignin more loose through the freezing-thawing process. distance, and destr...
Embodiment 1
[0058] (1) Moso bamboo slices (bamboo is 1cm thick, cut into 10cm long and 1cm wide);
[0059] (2) Place bamboo slices in deionized water (solid-to-liquid ratio 1:10), heat at 170°C for 20min; then place bamboo slices in NaOH, Na 2 S mixed solution (the amount of alkali used is 20%, the degree of sulfide is 25%, and the solid-liquid ratio is 1:4), heated at 155°C for 1h, washed with water until neutral;
[0060] (3) Place the bamboo slices in step (2) in a refrigerator to freeze at 0°C for 1 hour, then thaw at 25°C to obtain wet bamboo slices, dry the wet bamboo slices until the water content is less than or equal to 10%, and pass mechanical extrusion and The monodisperse and uniform mixed cells and bamboo fibrils were obtained by sieving. The mixed cells were replaced in tert-butanol for 12 hours, and then freeze-dried for 12 hours to obtain dried hollow and porous mixed cells with a yield of 11.5%, 68% of cellulose, 15% of hemicellulose and 17% of lignin.
[0061] (4) Carr...
Embodiment 2
[0064] (1) Moso bamboo slices (bamboo is 1cm thick, cut into 10cm long and 1cm wide);
[0065] (2) Put bamboo slices in deionized water (solid-to-liquid ratio is 1:10), heat at 170°C for 20min; put bamboo slices in NaOH, NaOH 2 S mixed solution (the amount of alkali used is 20%, the degree of sulfide is 25%, and the solid-liquid ratio is 1:4), heated at 155°C for 2h, washed with water until neutral;
[0066] (3) Place the bamboo slices in step (2) in a refrigerator to freeze at 0°C for 1 hour, then thaw at 25°C to obtain wet bamboo slices, dry the wet bamboo slices until the water content is less than or equal to 10%, and pass mechanical extrusion and Sieve to obtain monodisperse and uniform miscellaneous cells and bamboo fibrils. The miscellaneous cells are replaced in tert-butanol for 12 hours, and then freeze-dried for 12 hours to obtain dried hollow and porous miscellaneous cells. The yield is 9.7%, and the cellulose is 79%. Hemicellulose is 13% and lignin is 8%.
[0067] ...
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Abstract
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