Preparation method of novel quinoline thermo-sensitive ionic liquid and method for catalyzing methyl esterification of long-chain fatty acid by adopting novel quinoline thermo-sensitive ionic liquid
An ionic liquid, temperature-sensitive technology, applied in chemical instruments and methods, preparation of organic compounds, preparation of carboxylic acid esters, etc. Application prospect, excellent catalytic performance, significant scientific effect
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Embodiment 1
[0040] Embodiment 1 (synthesis of ionic liquid): preparation method 1 of quinoline bisulfate ionic liquid
[0041] Add 0.1mol of quinoline into a round bottom flask, add 50mL of ethanol as a reaction solvent, cool down to 5°C in an ice bath, slowly add 0.1mol of concentrated sulfuric acid dropwise with a constant pressure titration funnel, drop it in half an hour, and then Under stirring for 2h, a white turbid liquid was obtained, and the reaction was stopped. The product was rotovaped and the ethanol was removed to give a white solid. Then wash with acetone for 3 to 4 times, and finally use absolute ethanol to recrystallize the crude product, and obtain a white powder solid after vacuum drying, which is the product quinoline hydrogen sulfate.
Embodiment 2
[0042] Embodiment 2 (synthesis of ionic liquid): preparation method 2 of quinoline bisulfate ionic liquid
[0043] Add 0.09 mol of quinoline into a round bottom flask, add 50 ml of ethanol as a reaction solvent, cool down to 3°C in an ice bath, slowly add 0.1 mol of concentrated sulfuric acid dropwise with a constant pressure titration funnel, drop it in half an hour, and then Under stirring for 1.5h, a white turbid liquid was obtained, and the reaction was stopped. The product was rotovaped and the ethanol was removed to give a white solid. Then wash with acetone for 3 to 4 times, and finally use absolute ethanol to recrystallize the crude product, and obtain a white powder solid after vacuum drying, which is the product quinoline hydrogen sulfate.
Embodiment 3
[0044] Embodiment 3 (synthesis of ionic liquid): preparation method 3 of quinoline bisulfate ionic liquid
[0045] Add 0.1mol of quinoline into a round bottom flask, add 50mL of ethanol as a reaction solvent, cool down to 5°C in an ice bath, slowly add 0.09mol of concentrated sulfuric acid dropwise with a constant pressure titration funnel, drop it in half an hour, and then Under stirring for 3h, a white turbid liquid was obtained, and the reaction was stopped. The product was rotovaped and the ethanol was removed to give a white solid. Then wash with acetone for 3 to 4 times, and finally use absolute ethanol to recrystallize the crude product, and obtain a white powder solid after vacuum drying, which is the product quinoline hydrogen sulfate.
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