Ion liquid catalyst of esterification reaction, preparation method and usage
A technology of esterification reaction and ionic liquid, which is applied in the field of esterification reaction catalyst and its synthesis, can solve the problems of low conversion rate of esterification reaction, complex synthesis of ionic liquid, and a large amount of organic solvents, etc., and achieve environmental friendliness, high purity, low cost effect
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Embodiment 1
[0028] Weigh 16.9 g (0.1 mol) of N-butyl-2-pyrrolidone and dissolve it in benzene, slowly add 9.6 g (0.1 mol) of methanesulfonic acid dropwise under stirring at 20°C, drop it in 30 minutes, continue stirring at 50°C for reaction 4 After 1 hour, the benzene was removed by heating under vacuum to obtain a light yellow liquid, which was the product N-butyl-2-pyrrolidone methanesulfonic acid ionic liquid. Stable to water and air, the yield is 97%. Density 1.1021 g / ml, conductivity 1.07×10 -3 S / cm, the melting point is -54°C.
Embodiment 2
[0030] Weigh 19.8 grams (0.2 mol) of N-methyl-2-pyrrolidone, slowly add 19.2 grams (0.2 mol) of methanesulfonic acid dropwise under stirring at 0°C, drop it in 3 hours, continue to stir and react at 80°C for 5 hours, that is The product N-methyl-2-pyrrolidone methanesulfonic acid ionic liquid was obtained. Stable to water and air, density 1.154 g / ml, conductivity 2.64×10 -3 S / cm, the melting point is -46°C. Yield 100%.
Embodiment 3
[0032] Weigh 12.8 g (0.1 mol) of N-isopropyl-2-pyrrolidone, slowly add 30 mL of a toluene solution of 9.6 g (0.1 mol) of methanesulfonic acid dropwise under stirring at 20°C, drop it in 30 minutes, and continue to stir the reaction at 100°C After 2 hours, the toluene was removed under vacuum by heating to obtain the product N-methyl-2-pyrrolidone ionic liquid. Stable to water and air, the yield is 98%. Density 1.134 g / ml, conductivity 2.54×10 -3 S / cm, the melting point is -56°C.
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