In view of the shortcomings of traditional chitosan preparation process such as high pollution and high water consumption,this paper proposes a new green method for preparing high-purity chitosan based on ionic liquids.The results showed that the[Emim]OAc and[Ch]Ms can respectively prepare chitin with purities of 90.7％and 97.4％,and yields of 38.1％and 63.9％through a two-step dissolution-regeneration method and a one-step dissolution-separation method.Compared with the 1-ethyl-3-methylimidazolium acetate([Emim]OAc)extraction system,the water content has less influence on chitin extraction by choline methanesulfonate[Ch]Ms.When the water content increases to 50％,the chitin purity still reached 94.3％,and the yield remained at 60％.Additionally,the chitin structure obtained from the[Ch]Ms separation remained in the α form,while the chitin obtained from the[Emim]OAc separation transitioned to a semi-α form.The preliminary mechanism indicated that the synergistic action of the cations and anions in[Ch]Ms effectively removed protein and calcium carbonate,resulting in high-purity chitin.Compared to the[Emim]OAc system,the[Ch]Ms system offered advantages such as lower cost,easier separation,and shorter processing time,making it more suitable for large-scale applications.
维普
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