Preparation method of optical cellulose triacetate

The invention discloses a preparation method of optical cellulose triacetate, belonging to the technical field of high polymer chemistry. The method comprises the following steps of: (1) crushing of the refined cotton; (2) drying of the refined cotton; (3) activation; (4) esterification; (5) neutralization; (6) dilution and bleaching; (7) filtering, precipitation, wet crushing and washing; (8) drying; and (9) granulation. The method disclosed by the invention can reduce the ash content and acetic acid content of the cellulose triacetate and improve the mechanical properties and optical characteristics of a cellulose triacetate membrane; and the prepared cellulose triacetate has uniform particles and low viscosity and can be quickly dissolved.