Method for synthesizing cyclic carbonate from carbon dioxide and epoxy compound
A technology of epoxy compounds and cyclic carbonates, applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, chemical/physical processes, etc., can solve poor reactivity, increase production costs, and product Difficult separation and other problems, to achieve the effect of easy recycling
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Embodiment 1
[0024] Grafting catalyst MCM-41-g-Cl-TMEDA + I - precursor TMEDA + I - The synthesis procedure is as follows: take 4.65g of tetramethylethylenediamine, 3.68g of n-butane iodide, and 50mL of absolute ethanol, put them into a 100mL round bottom flask, and react with magnetic stirring at 60°C for 12h. After the reaction is finished, ethanol is removed by rotary evaporation to obtain a green viscous liquid, then acetone is added, and the diquaternary ammonium salt is precipitated as white, and the diquaternary ammonium salt is removed by filtration, and anhydrous ether is added to the filtrate to obtain [N 114 , 2N 11 ] I, purified by recrystallization with acetone / anhydrous ether (1:2), adding acetone, no precipitation occurs, the solution is light green, and becomes light yellow after adding anhydrous ether.
[0025] Using the same method, react at 60°C for 12h to prepare [N 114 , 2N 11 ]Cl, [N 114 , 2N 11 ]Br, where [N 114 , 2N 11 ] Br is light yellow viscous liquid. ...
Embodiment 2
[0028]2.9g propylene oxide, heterogeneous catalyst prepared by 0.3g example 1, add 90mL stainless steel reactor, airtight reactor, CO 2 Pressurize to 2MPa, heat up to 120°C, and react for 6 hours to end the reaction. After the reaction liquid is cooled, the catalyst is recovered by filtration, and the product obtained is added to the internal standard acetophenone, and quantitatively analyzed by the internal standard method. The conversion rate of propylene oxide>> 99%, propylene carbonate selectivity > 99%.
Embodiment 3
[0030] 2.9g propylene oxide, heterogeneous catalyst prepared by 0.1g example 1, add 90mL stainless steel reactor, airtight reactor, CO 2 Pressurize to 2MPa, heat up to 120°C, and react for 5 hours to end the reaction. After the reaction liquid is cooled, the catalyst is recovered by filtration, and the obtained product is added to internal standard acetophenone, and quantitatively analyzed by internal standard method, the obtained propylene oxide conversion rate is 55%. %, propylene carbonate selectivity>99%, corresponding TOF 61h -1 .
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