| 摘要 |
<p>A process for producing trioxane from an aqueous formaldehyde solution at a high distillation efficiency in an energy-saving manner, which comprises the following steps (i) to (iv): (i) the step of forming trioxane by passing a highly concentrated aqueous solution of formaldehyde through a reactor packed with a solid acid catalyst; (ii) the step of extracting the formed trioxane from the aqueous formaldehyde solution containing the same with a water-insoluble organic solvent having a boiling point higher than that of trioxane and incapable of forming an azeotrope therewith; (iii) the step of removing low-boiling substances contained in the organic solvent phase containing trioxane by distillation or evaporation; and (iv) the step of distilling the trioxane-containing organic solvent freed from the low-boiling substances, thereby obtaining trioxane from the top of the distillation column and returning the organic solvent from the bottom of the column to the step (ii).</p> |
