Mixing ethylene carbonate with anhydrous potassium thiocyanate and heating to 80- 100℃; C, keeping the temperature for 5 hours, and collecting the distilled substance, namely ethylene oxide. The by-product carbon dioxide is discharged, and the by-product cyanate can be concentrated to 98% after washing, and sold as an industrial product. (See the patent CN 10 1434567A "Preparation method of diethylaminoethanethiol")
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