Patent ID: 9598394
Date: 2017-03-21
CPC Classifications: C07D

Claim:
1. A method of producing trioxane, comprising: (A) preparing trioxane from a formaldehyde aqueous solution in the presence of an acid catalyst; (B) distilling a mixture including trioxane, thus obtaining a distilled gas mixture; (C) liquefying the distilled gas mixture, thus obtaining a liquefied liquid mixture; (D) mixing the liquefied liquid mixture with an extraction solvent to give a mixture, which is then separated into an aqueous phase and a solvent phase; (E) distilling the solvent phase to give trioxane, and mixing the aqueous phase with the extraction solvent to give a mixture, which is then separated into an aqueous phase and a solvent phase; and (F) discharging the aqueous phase separated in (E) out of a system, and recirculating the solvent phase so as to be reused in (D) and (E), wherein before (C), a temperature of the gas mixture is adjusted via pressure control; in (C), pure water is converted into a steam to recover energy using latent heat of the gas mixture; and after (C), some of the liquefied liquid mixture is recirculated to (B), and the extraction solvent is a solvent that is immiscible with water and has trioxane solubility higher than that of water.