Dissolution Characteristic of Shrimp Shells in 1-ethyl-3-methylimidazolium Acetate Ionic Liquid

To seek green processes of chitin extracting from shrimp processing waste,ionic liquid(IL)1-ethyl-3-methylimidazolium acetate(C₂ mimAc)was used as the solvent in this study,the effects of dissolution time,dissolution temperature,and solid-solvent ratio on the solubility,recovery rate,and the influence of the composition,apparent morphology and crystal structure after regeneration were investigated. The results showed that,when the solid-liquid ratio was 1:20 w/w,the solubility of shrimp shells inC₂ mimAc could reach 15.30% after heating 1 h. Compared with the untreated shrimp shells,the surface of the sample after dissolution and regeneration byC₂ mimAc was porous,rough or distorted,and the crystalline structure was destroyed,and the deproteinization and demineralization could reach 67.13% and 42.84%,respectively. When the temperature exceeded 120℃ and the time was more than 2 h,the capacity ofC₂ mimAc to dissolve shrimp shells dropped significantly.