Preparation method and application of ionic liquid-sodium (mono-/di-)hydrogen phosphate buffer aqueous two-phase system
A two-phase system and ionic liquid technology, applied in the direction of organic chemistry, can solve the problems that liquid-liquid extraction cannot meet the separation requirements, and achieve the effect of strong practical value, easy phase separation, and high enrichment degree
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Embodiment 1
[0015] (1) Preparation of nicotine-modified ionic liquid: Add 0.5 mmol polyethylene glycol-6000 bridged imidazole and 0.5 Mmol nicotine-nornicotine-neonicotine mixture (molar ratio 6:2:1), heated and stirred in a water bath at 80°C, and reacted for 40 h. After rinsing, add 100mL chloroform and 0.2mmol NaB (C 6 h 5 ) 4 , react at room temperature for 40 hours, then add 2.0 mmol ethylenediamine, and reflux for 10 hours to obtain a variety of nicotine-modified polyethylene glycol-6000 ionic liquids;
[0016] (2) Preparation of two-phase aqueous system: Add 10g of polyethylene glycol-6000 ionic liquid into 2.6mL of acetone solvent, and sonicate for 5min to obtain solution A; add 28g of deionized water to another beaker, and then add 4.8g of phosphoric acid Sodium hydrogen disodium-sodium dihydrogen phosphate mixture (molar ratio 2:1) to obtain solution B; put the container containing 20mL A in a 47°C water bath, slowly add 16mL solution B while stirring, and let stand;
[0017...
Embodiment 2
[0019] (1) Preparation of nicotine-modified ionic liquid: Add 0.5 mmol polyethylene glycol-6000 bridged imidazole and 0.5 Mmol nicotine-nornicotine-neonicotine mixture (molar ratio 18:2:1), heated and stirred in a water bath at 80°C, and reacted for 40 h. After rinsing, add 100mL chloroform and 0.2mmol NaB (C 6 h 5 ) 4 , react at room temperature for 40 hours, then add 2.0 mmol ethylenediamine, and reflux for 10 hours to obtain a variety of nicotine-modified polyethylene glycol-6000 ionic liquids;
[0020] (2) Preparation of two-phase aqueous system: Add 5.3g of polyethylene glycol-6000 ionic liquid to 4.8mL of acetone solvent, sonicate for 5 minutes to obtain solution A; add 16mL of deionized water to another beaker, and then add 7.9g Disodium hydrogen phosphate-sodium dihydrogen phosphate mixture (molar ratio 2:1) to obtain solution B; put the container containing 20mL of A in a 35°C water bath, slowly add 27mL of solution B while stirring, and let stand;
[0021] (3) Ad...
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