Production method for preparing low-substituted cellulose acetate
A technology of cellulose acetate and low degree of substitution, which is applied in the field of cellulose derivatives manufacturing, which can solve the problems of difficult industrialization, difficult production of cellulose acetate, and high cost of ionic liquids, and achieve the effect of reducing the degree of substitution of products
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Embodiment 1
[0028] A production method for preparing cellulose acetate with low degree of substitution, comprising the following steps:
[0029] (1) Selection of raw materials: use acetate grade refined cotton;
[0030] (2) Raw material pretreatment: put 200g of acetate-grade refined cotton in the activation machine, spray 600g of acetic acid on the acetate-grade refined cotton, and activate at room temperature for 1 hour;
[0031] (3) Esterification: Simultaneously mix 600g of acetic anhydride and 12g of concentrated sulfuric acid and cool to 0°C; put the activated cellulose acetate grade refined cotton into the cooled mixture for 20min, the reaction temperature is 40°C, and react for 1h;
[0032] (4) Hydrolysis: 550 g of acetic acid aqueous solution with a mass fraction of 50% was added to the solution after esterification, and hydrolyzed for 8 hours, so that the water content in the solution system was 13%;
[0033] (5) neutralization: adding 63g mass fraction to the hydrolyzate is 30...
Embodiment 2
[0037] A production method for preparing cellulose acetate with low degree of substitution, comprising the following steps:
[0038] (1) select raw material: select velvet wood pulp for use;
[0039] (2) Raw material pretreatment: put 200g fluffy wood pulp in the activation machine, spray 600g acetic acid on the cotton material, and activate it at room temperature for 1h;
[0040] (3) Esterification: Simultaneously mix 600g of acetic anhydride and 12g of concentrated sulfuric acid and cool to 0°C; put the activated cotton material into the cooled mixture for 30min, the reaction temperature is 50°C, and react for 0.5h;
[0041] (4) Hydrolysis: adding 550 g of acetic acid aqueous solution with a mass fraction of 50% to the esterification liquid, hydrolyzing for 8 hours, so that the water content in the solution system is 13%;
[0042] (5) neutralization: adding 63g mass fraction to the hydrolyzate is 30% sodium acetate aqueous solution, neutralizes the sulfuric acid of reaction...
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