Method for synthesizing levulinate
A technology of levulinic acid ester and levulinic acid, applied in the field of platform compound synthesis, to achieve the effect of high yield
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Embodiment 1
[0036] A method for synthesizing ethyl levulinate, the steps are as follows:
[0037] Take 5mmol of levulinic acid, 10mL of ethanol, 0.116g of loaded PDA-SO 3 H solid acid catalyst (the mass ratio of levulinic acid to catalyst is 1:0.2) was successively added into a 100mL round-bottomed three-necked flask, and the esterification reaction took place at 70°C, 80°C, 90°C, 100°C, and 110°C for 5 hours respectively to obtain Ethyl levulinate. Among them load type PDA-SO 3 The mass ratio of the acid in the H solid acid catalyst to the PDA carrier is 96:100, and the catalyst is also coated with ferric oxide nanoparticles, and the mass ratio of the nanoparticles to the PDA carrier is 0.9:1. The conversion rate of levulinic acid is shown in Table 1.
[0038] Table 1
[0039] Esterification temperature
[0040] As can be seen from Table 1, as the esterification reaction temperature increases, the conversion rate of levulinic acid increases gradually, and when 100 DEG C, th...
Embodiment 2
[0042] A method for synthesizing n-butyl levulinate, the steps are as follows:
[0043] Take 5mmol of levulinic acid, 10mL of n-butanol, 0.116g of loaded PDA-SO 3 H solid acid catalyst (the mass ratio of levulinic acid to catalyst is 1:0.2) was successively added to a 100mL round-bottomed three-neck flask, and esterification reactions occurred at 70°C, 80°C, 90°C, and 100°C for 5 hours to obtain levulinic acid n-butyl ester. Among them load type PDA-SO 3 The mass ratio of the acid in the H solid acid catalyst to the PDA carrier is 87:100, and the catalyst is also coated with ferric oxide nanoparticles, and the mass ratio of the nanoparticles to the PDA carrier is 0.8:1. The conversion rate of levulinic acid is shown in Table 2.
[0044] Table 2
[0045] Esterification temperature
[0046] As can be seen from Table 2, as the esterification reaction temperature increases, the conversion rate of levulinic acid increases gradually, and when 90 DEG C, the conversion r...
Embodiment 3
[0048] A method for synthesizing n-octyl levulinate, the steps are as follows:
[0049] Take 5mmol of levulinic acid, 10mL of n-octanol, 0.116g of loaded PDA-SO 3 H solid acid catalyst (the mass ratio of levulinic acid to catalyst is 1:0.2) was successively added into a 100mL round-bottomed three-necked flask, and the esterification reaction occurred at 100°C, 110°C, and 120°C for 4 hours to obtain n-octyl levulinate . Among them load type PDA-SO 3 The mass ratio of the acid in the H solid acid catalyst to the PDA carrier is 77:100, and the catalyst is also coated with ferric oxide nanoparticles, and the mass ratio of the nanoparticles to the PDA carrier is 0.7:1. The conversion rate of propionic acid is shown in Table 3.
[0050] table 3
[0051] Esterification temperature
[0052] As can be seen from Table 3, as the esterification reaction temperature increases, the conversion rate of levulinic acid increases gradually, and when 110 DEG C, the conversion rate o...
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