Method for preparing dialkyl carbonates
A technology of carbonic acid diester and compound, applied in the field of preparing carbonic acid diester, can solve the problem of low production capacity and the like
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Embodiment 1
[0038] Listed according to Table 1, methyl alcohol, cuprous chloride, 2-methylimidazole cocatalyst and chloride 1-butyl-3-methylimidazolium salt ([Bmim][Cl]) ionic liquid are placed in a stirring In a 1L stainless steel high-pressure reactor with Teflon as the lining material, and replace the air in the reactor with nitrogen, pressurize to 25kg / cm 2 Nitrogen gas was not introduced thereafter. Next, start the stirrer, and after the temperature of the reaction system rises to 120° C., start to introduce the mixed gas containing carbon monoxide and oxygen into the reactor. The concentration of cuprous chloride catalyst was 16492 ppm. After the reaction continued for 1 hour, the obtained product was analyzed by gas chromatography and the yield, conversion and selectivity were calculated, and the results were recorded in Table 1.
Embodiment 2 to 9
[0040] According to list in Table 1, change the kind and addition amount of cocatalyst and / or ionic liquid, repeat the step of embodiment 1. After the reaction continued for 1 hour, the obtained product was analyzed by gas chromatography and the yield, conversion and selectivity were calculated, and the results were recorded in Table 1.
[0041] Table 1
[0042] comparative example
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comparative example
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9
Methanol (wt%)
97.3
91.2
80.4
79.4
78.5
7.5
80.8
79.1
77.2
77.7
72.3
Cuprous chloride (wt%)
2.7
2.7
2.7
2.7
2.7
2.7
2.7
2.7
2.7
2.7
2.7
2-Methylimidazole (wt%)
6.1
6.1
6.1
6.1
6...
Embodiment 10
[0049] Listed according to Table 2, methyl alcohol, cuprous chloride, 2-methylimidazole cocatalyst and chloride 1-butyl-3-methylimidazolium salt ([Bmim][Cl]) ionic liquid are placed in a stirring In a 1L stainless steel high-pressure reactor with Teflon as the lining material, and replace the air in the reactor with nitrogen, pressurize to 25kg / cm 2 Nitrogen gas was not introduced thereafter. Next, start the stirrer, and after the temperature of the reaction system rises to 120° C., start to introduce the mixed gas containing carbon monoxide and oxygen into the reactor. The concentration of cuprous chloride catalyst was 16492 ppm. After the reaction continued for 1 hour, the obtained product was analyzed by gas chromatography and the yield, conversion and selectivity were calculated, and the results were recorded in Table 2.
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