The production method of dimethyl carbonate
A technology of dimethyl carbonate and its production method, which is applied in the direction of organic carbonate preparation, bulk chemical production, chemical instruments and methods, etc., can solve the problems of rapid decline in activity and easy swelling of resin, and achieve enhanced swelling resistance, high The effect of activity and selectivity
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Embodiment 1
[0028] Add 58.0 grams of styrene, 0.6 grams of divinylbenzene, 30 grams of polystyrene and 0.6 grams of benzoyl peroxide initiator in a 500 milliliter three-necked flask, and stir for 2.0 hours at 60°C; then add 2.8 grams of multi-walled carbon Nanotubes, continue stirring for 1 hour for pre-polymerization. 260 mL of deionized water in which 2.5 g of polyvinyl alcohol had been dissolved was added. Adjust the stirring speed, while gradually raising the temperature to 80°C, and react for 5 hours; then raise the temperature to 90°C, react for 5 hours, and finally raise the temperature to 98°C, and react for 6 hours. After the reaction, pour out the upper liquid, wash with 85°C hot water, then wash with cold water, then filter, put in an oven to dry at 80°C, sieve, and collect composite microspheres with a particle size within the range of 0.35 to 0.60 mm a.
[0029] Chloromethylation of composite microspheres: In a 500-ml three-necked flask, add 50 grams of composite microspher...
Embodiment 2
[0033] The synthesis process of the composite microsphere and the composite chlorine sphere is the same as [Example 1].
[0034] Synthesis of carboxyimidazole: In a 500 ml three-necked flask, add 20 g of imidazole, 41.5 g of bromoacetic acid and 120 ml of acetonitrile, and react under reflux for 30 hours. After the reaction, evaporate the solvent to obtain carboxy imidazole S2.
[0035] Synthesis of composite carboxylimidazole resin: add 20 grams of composite microspheres, 38 grams of carboxylimidazole S2 and 120 milliliters of toluene in a 500 three-necked flask, stir and react under reflux for 30 hours, filter and remove the mother liquor after the reaction, and use dichloro Wash with methane, acetone and water, and dry under vacuum to obtain composite carboxylimidazole resin A2.
Embodiment 3
[0037] Add monomer mixture solution (60.0 gram styrene, 1.7 gram divinylbenzene, 60 gram polystyrene, 1.6 gram multi-walled carbon nanotube and 1.0 gram benzoyl peroxide containing initiator in 500 milliliters of three-necked flasks, The solution was first stirred and reacted at 70°C for 0.5 hours), started the agitator, added a mixed solution of 200 milliliters of deionized water and 5 grams of gelatin, raised the temperature to 85°C, reacted for 3 hours, then raised the temperature to 90°C, reacted for 9 hours, and finally The temperature was raised to 100° C., and the reaction was carried out for 10 hours. After the reaction, pour out the upper liquid, wash with 85°C hot water, then wash with cold water, then filter, put in an oven to dry at 80°C, sieve, and collect composite microspheres with a particle size within the range of 0.35 to 0.60 mm b.
[0038] Chloromethylation of composite microspheres: In a 500-ml three-necked flask, add 50 grams of composite microspheres B ...
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