One-step extraction and separation of high purity chitin based on choline ionic liquid
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.
万方数据
维普
