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A kind of method for directly preparing propylene carbonate by CO2 and propylene
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A technology of propylene carbonate and CO2 is applied in the field of biomimetic catalytic oxidation of propylene and the preparation of propylene carbonate, which can solve the problems of low yield and harsh reaction conditions.
Active Publication Date: 2018-03-13
HUNAN KAIMEITE GASES
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Problems solved by technology
[0004] The present invention will solve the technical problems of low yield and harsh reaction conditions in the industrial preparation of propylene carbonate by carbon dioxide and propylene oxide synthesis method in the prior art
Method used
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Embodiment 1
[0017] Take 80ml of trimethylbenzene, 0.001g of 5,10,15,20-tetrakis(4-fluorophenyl)iron porphyrin, 1.0g of sodium dodecylbenzenesulfonate, and 1.2g of Tween 80 in a reaction kettle, and seal it. 0.50MPa propylene, 0.8MPa CO 2 , 0.30 MPa O 2 , put the reaction kettle in the electric heating mantle, set the heating temperature, and use the sensor to control the temperature, react at 120°C for 4 hours, put the reaction kettle in an ice-water bath, stop the reaction, mix the reaction solution, and take 0.1894g of the reaction solution , add 0.0934g chlorobenzene as internal standard, add 30ml ethyl acetate as solvent again, be made into mixed solution, measure its concentration with the method established in the gas chromatograph, obtain productive rate 90%.
Embodiment 2
[0019] Take 800ml of trimethylbenzene, 0.01g of 5,10,15,20-tetrakis(4-chlorophenyl)iron porphyrin, 10g of sodium dodecylbenzenesulfonate, and 12g of Tween 80 in a reaction kettle, and seal it. 0.35MPa propylene, 0.9MPa CO 2 , 0.50 MPa O 2 , put the reaction kettle in the electric heating mantle, set the heating temperature, and use the sensor to control the temperature, react at 125°C for 3h, put the reaction kettle in an ice-water bath, stop the reaction, mix the reaction solution, and take 0.1894g of the reaction solution , add 0.0934g chlorobenzene as internal standard, then add 30ml ethyl acetate as solvent, be made into mixed solution, measure its concentration with the method that has established in the gas chromatograph, obtain productive rate 92%.
Embodiment 3
[0021] Get 80ml of trimethylbenzene, 0.001 gram of 5,10,15,20-tetrakis(4-methoxyphenyl) manganese porphyrin in a reaction kettle, 1.2 gram of sodium dodecylbenzenesulfonate, 1.4 gram of Tween 80, seal . 0.30MPa propylene, 0.8MPa CO 2 , 0.31 MPa O 2 , put the reaction kettle in the electric heating mantle, set the heating temperature, and use the sensor to control the temperature, react at 123°C for 3h, put the reaction kettle in an ice-water bath, stop the reaction, mix the reaction solution, and take 0.1894g of the reaction solution , add 0.0934g chlorobenzene as internal standard, add 30ml ethyl acetate as solvent again, be made into mixed solution, measure its concentration with the method established in the gas chromatograph, obtain productive rate 56%.
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Abstract
The preparation method of propylene carbonate, the raw materials used are CO2, O2 and propylene, which is characterized in that it includes the following steps: (1) passing O2, propylene and CO2 into a reaction chamber equipped with metalloporphyrin, composite surfactant and trimethylbenzene The reaction is carried out in a kettle; the dosage of metalporphyrin is 0.001% to 0.02% of the total weight of propylene and CO2; the composite surfactant is a mixture of sodiumdodecylbenzenesulfonate and Tween 80, and the dosage is the total weight of propylene and CO2 10% to 15%; trimethylbenzene is used as solvent, and the dosage is 200% to 400% of the total weight of propylene and CO2, so that the reaction kettle is in a sealed state; (2) React at 120°C to 130°C for 3h to 4h; (3 ) Place the reaction kettle in an ice water bath to stop the reaction. The best yield of the above reaction can reach 95%.
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