a co 2 Capture and direct method for synthesizing dialkyl carbonate
A technology of dialkyl carbonate and monohydric alcohol, which is applied in the field of CO2 capture, can solve the problem of low energy consumption and achieve the effect of improving the conversion rate of reactants and realizing enrichment and utilization
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[0009] One aspect of the present invention provides a method for preparing dialkyl carbonate, the method comprising: in the presence of amine absorbents, catalysts and dehydrating agents, containing CO 2 The gas undergoes an esterification reaction with a monohydric alcohol.
[0010] According to the present invention, when in CO 2 During the esterification reaction with monohydric alcohol, when amine absorbent is added, it can reach CO 2 The purpose of capture, but also the CO 2 The gas dissolves into solution to facilitate contact with the monohydric alcohol, thereby increasing the conversion of reactants and the selectivity of dialkyl carbonate.
[0011] According to the present invention, preferably, the monohydric alcohol is a C1-C8 monohydric alcohol, preferably one or more of methanol, ethanol, n-propanol, isopropanol and n-butanol. It should be understood that different alcohols determine the ester alkyl chains of different dialkyl carbonates, for example, with meth...
Embodiment 1
[0029] This embodiment is used to illustrate the preparation method of dialkyl carbonate of the present invention and from containing CO 2 CO capture from gas 2 Methods.
[0030] (1) Get monohydric alcohol, amine compound and catalyst (see Table 1 for type and consumption) and place in 0.1L reactor, and add dehydrating agent (see Table 1 for type and consumption);
[0031] (2) Seal the reactor, and use 50mL / min CO 2 Gas (CO 2 The content is more than 99%, the same below) The reactor is purged 3 times, and all the air sealed in the reactor is discharged;
[0032] (3) Use 50mL / min CO 2 The gas presses the reactor, when the pressure reaches 1.5MPa, stop the stamping and maintain the pressure at 25°C for 12h;
[0033] (4) Heat the reaction kettle after the pressure keeping in step (3) at a speed of 5°C / min, stop the temperature rise when the temperature reaches 130°C, and keep the temperature constant for 6h.
[0034] The obtained monoalcohol conversion rate and the selectivit...
Embodiment 2
[0036] This embodiment is used to illustrate the preparation method of dialkyl carbonate of the present invention and from containing CO 2 CO capture from gas 2 Methods.
[0037] (1) Get monohydric alcohol, amine compound and catalyst (see Table 1 for type and consumption) and place in 0.1L reactor, and add dehydrating agent (see Table 1 for type and consumption);
[0038] (2) Seal the reactor, and use 80mL / min CO 2 Gas (CO 2 The content is more than 99%, the same below) The reactor is purged 3 times, and all the air sealed in the reactor is discharged;
[0039] (3) Using 80mL / min CO 2 The gas presses the reactor, when the pressure reaches 5MPa, stop the stamping and maintain the pressure at 25°C for 10h;
[0040] (4) Heat the reaction kettle after the pressure keeping in step (3) at a speed of 10° C. / min, stop heating when the temperature reaches 150° C., and keep the temperature constant for 8 hours.
[0041] The obtained monoalcohol conversion rate and the selectivity...
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