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• W4220800145 abstract "Chitin is a widely used important industrial polymer mainly from shrimp shells, but its commercial preparation is under the great challenge of serious pollution due to the requirement of HCl and NaOH. Herein, we demonstrated that high purity chitin can be obtained from waste shrimp shells (WSSs) by cascade separation with transition metal salt aqueous solution and ionic liquid (IL). Firstly, calcium carbonate of WSSs was effectively removed in the metal salt aqueous solution driven by the ion exchange interaction. Subsequently, 1-butyl-3-methylimidazolium chloride ([Bmim]Cl) had bifunctional abilities to remove residual protein and introduced metal salts simultaneously by hydrogen bonding and coordination interactions. The key experimental factors affecting the separation process were systematically studied, including the type of metal salts, temperature, and [Bmim]Cl loading. After sequential treatment with a 20% (mass) NiSO4 aqueous solution at 130 °C and [Bmim]Cl at 150 °C, the purity of α-chitin can be up to 96.5% (mass) that meets commercial requirements. The use of metal salts with higher coordination ability makes the preparation of chitin no longer depend on the commonly acid-base reaction, which is conducive to the preservation of chitin structure." @default.
• W4220800145 created "2022-04-03" @default.
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• W4220800145 date "2023-01-01" @default.
• W4220800145 modified "2023-09-26" @default.
• W4220800145 title "Separation of chitin from shrimp shells enabled by transition metal salt aqueous solution and ionic liquid" @default.
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• W4220800145 doi "https://doi.org/10.1016/j.cjche.2022.01.031" @default.
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