Method for preparing dissolving pulp and other high value-added products by using crop straw
A high value-added, crop straw technology, applied in the direction of inorganic alkali pulping, multi-stage pulping process, microbial/enzymatic cellulose treatment, etc., can solve the problem of inefficient use of straw resources, failure to ensure product integrity and high Quality, environmental pollution and other issues, to achieve the effect of promoting industrial production, broadening the range of materials used, and avoiding serious pollution
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Embodiment 1
[0043] A method for preparing dissolving pulp and other high value-added products from crop stalks, comprising the steps of:
[0044] 1. Preparation of dissolving slurry
[0045] 1) The leaves and ears of wheat straw are removed, and the straw after removal of leaves and ears is removed, dusted, shredded, cut into sections (2-3cm), washed with water, and put into a cooking pot;
[0046] 2) Add water 10 times the weight of the straw into the cooking pot, add ammonia water until the mass concentration of the lye is 7%; add steam to the cooking pot to raise the temperature to 95°C, pass inert gas nitrogen into the cooking pot, and cook The air in the pot is exhausted; then steam and inert gas are intermittently introduced into the cooking pot to maintain the temperature in the cooking pot at 95°C and the pressure at 0.8MPa, and keep the temperature and pressure for 60 minutes;
[0047] In this step, most of the hemicellulose can be extracted and most of the siliceous and other i...
Embodiment 2
[0073] A method for preparing dissolving pulp and other high value-added products from crop stalks, comprising the steps of:
[0074] 1. Preparation of dissolving slurry
[0075] 1) Remove the leaves and ears of the corn stalks. After removing the leaves and ears, the straws are cleaned of impurities, dust, shredded, cut into sections (4-5cm), washed with water, and put into a cooking pot;
[0076] 2) Add water with 13 times the weight of straw to the cooking pot, add potassium hydroxide until the mass concentration of the lye is 5%; pass steam into the cooking pot to raise the temperature to 85°C, and pass inert gas nitrogen into the cooking pot, Evacuate the air in the cooking pot; then intermittently pass steam and inert gas into the cooking pot to maintain the temperature in the cooking pot at 85°C and the pressure at 0.6MPa, and keep the temperature and pressure for 80 minutes;
[0077] In this step, most of the hemicellulose can be extracted and most of the inorganic sa...
Embodiment 3
[0103] A method for preparing dissolving pulp and other high value-added products from crop stalks, comprising the steps of:
[0104] 1. Preparation of dissolving slurry
[0105] 1) Remove the leaves and husks of the cotton stalks. After removing the leaves and husks, the cotton stalks are cleaned of impurities, dust, shredded, cut into sections (3-4cm), washed with water, and put into a cooking pot;
[0106] 2) Add water 12 times the weight of straw into the cooking pot, add ammonia water, until the mass concentration of lye is 6%; pass steam into the cooking pot to raise the temperature to 90°C, and pass inert gas nitrogen into the cooking pot to cook The air in the pot is exhausted; then steam and inert gas are intermittently introduced into the cooking pot to maintain the temperature in the cooking pot at 90°C and the pressure at 0.7MPa, and keep the temperature and pressure for 70 minutes;
[0107] In this step, most of the hemicellulose can be extracted and most of the ...
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Abstract
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