Method for preparing diethylene glycol dimethyl ether through ethylene glycol monomethyl ether
A technology of diethylene glycol dimethyl ether and ethylene glycol monomethyl ether, which is applied in the field of chemical raw material preparation, can solve the problems of small profit margin and high cost, and achieves a reaction with less by-products, less by-products and simple products. Effect
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Embodiment 1
[0041] Add 15.2 g of ethylene glycol monomethyl ether and 2 g of catalyst in a 180 mL autoclave, the catalyst carrier is silica, and the loads are 20% MgO, K 2 CO 3 、KNO 3 , KF. use N 2 Under the condition of 1.0 MPa, replace the air in the kettle three times, so that the remaining air content in the kettle is less than 0.1%, and then pass 2.0 MPa N 2 , let it stand for 30 minutes, and use it for leak testing of the reactor to ensure that the device is airtight and then evacuate the gas in the reactor. Under the condition of ensuring airtightness, the reaction was heated and heated. The stirring speed of the reactor was 500 rpm, the reaction pressure was 0.1 MPa, the reaction temperature was 140 °C, and the reaction time was 6 h. The reaction results are shown in Table 1.
[0042] Table 1. Effects of solid base catalysts with different loads on the reactivity of ethylene glycol monomethyl ether and the selectivity of reactants
[0043]
[0044] From the reaction data o...
Embodiment 2
[0046] Add 15.2 g of ethylene glycol monomethyl ether and 2 g of catalyst in a 180 mL autoclave. The catalyst load is 20% KF, and the supports are silica, activated carbon, magnesium oxide, calcium oxide, zirconium dioxide, and titanium dioxide. . use N 2 Under the condition of 1.0 MPa, replace the air in the kettle three times, so that the remaining air content in the kettle is less than 0.1%, and then pass 2.0 MPa N 2 , let it stand for 30 minutes, and use it for leak testing of the reactor to ensure that the device is airtight and then evacuate the gas in the reactor. Under the condition of ensuring airtightness, the reaction was heated and heated. The stirring speed of the reactor was 500 rpm, the reaction pressure was 0.1 MPa, the reaction temperature was 140 °C, and the reaction time was 6 h. The reaction results are shown in Table 2.
[0047] Table 2. Effect of solid base catalysts with different supports on reaction activity and product selectivity
[0048]
[00...
Embodiment 3
[0051] Add 15.2 g of ethylene glycol monomethyl ether, 2 g of KF / SiO loaded with 20 % KF into a 180 mL autoclave 2 catalyst, at room temperature with N 2 Replace the air in the kettle three times under the condition of 1.0 MPa, so that the remaining air content in the kettle is less than 0.1%, and then pass 2.0 MPa N 2 , let it stand for 30 minutes, and use it for leak testing of the reactor to ensure that the device is airtight and then evacuate the gas in the reactor. Under the condition of ensuring no air leakage, the heating was carried out under normal pressure, the stirring speed of the reactor was 500 rpm, the reaction time was 6 hours, the reaction pressure was 0.1 MPa, and the reaction temperatures were 100 °C, 120 °C, 140 °C, 150 °C, 160 ℃, 170 ℃, 180 ℃, 190 ℃, the reaction results under different reaction temperature conditions are shown in Table 3
[0052] Table 3. KF / SiO 2 Effect of Catalysts on Reaction Activity and Product Selectivity at Different Reaction Te...
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