Cellulose acetate production process
Preparation of raw materials
Where to make cellulose acetate, the first choice of raw materials. It is appropriate to take high-quality cellulose, whose fiber purity and degree of polymerization are suitable, which is the foundation. It is also necessary to prepare acetic acid and acetic anhydride, both of which are pure enough to meet the needs of the reaction. And the catalyst is also indispensable, carefully adjust its type and amount, so that the reaction is smooth.

Esterification reaction
The cellulose is co-located with acetic acid and acetic anhydride in the reactor, and a catalyst is added to promote it. The temperature is controlled at an appropriate temperature, and the temperature is initially raised slowly to make the material blend, followed by precise temperature control to achieve the best condition of esterification. During this period, stirring is non-stop to ensure that the reaction Depending on the reaction process, the temperature and pressure can be fine-tuned at times to maintain the complete esterification and the compatibility of the molecular structure of cellulose acetate.

Hydrolysis treatment
After esterification, the product enters the hydrolysis process. Adjust it with water or dilute acid to control the degree of hydrolysis, remove unreacted anhydride groups, and make the degree of substitution of cellulose acetate meet expectations. During hydrolysis, strictly measure the parameters, observe the properties of the product, and stop it at the right time to prevent quality loss caused by excessive hydrolysis.

Precipitation Separation
The mixed solution after hydrolysis is separated by precipitation. Choose the appropriate solvent to make cellulose acetate precipitate, and the solid and liquid are separated. During precipitation, control the conditions to make the precipitation uniform, easy to filter and wash After separation, solid phase cellulose acetate, liquid phase recovery of unreactant, followed by use, saving resources and reducing costs.

Wash and dry
The obtained cellulose acetate solid phase is washed several times to remove impurities and residual liquid. Wash with water or organic solvent until pure. Following the drying method, temperature control, humidity control, and time control are used to achieve the moisture content standard. After drying, cellulose acetate is loose and of high quality, which can be prepared for subsequent processing.

Quality inspection
Every step is completed, and quality inspection is carried out. Measure the degree of substitution, viscosity, purity, color, etc. With precision instruments and standard methods, accurate data are obtained. If the quality does not match, quick check for ginseng adjustment to ensure that the final product meets the needs of the industry and the market. After these steps, cellulose acetate can be used in a variety of fields to develop its unique functions.