Crude chitin produced from shrimp shells, crab shells, and other seafood processing by-products often has low purity, which does not meet the requirements of certain high-tech applications. This paper introduces a study on the chemical treatment of chitin to remove proteins and minerals, yielding purified chitin. The research investigated the effects of factors such as chemical concentration, solvent-to-material ratio, and treatment time on the purification efficiency. Experimental planning and process optimization were also conducted.