TWO-STAGE METHOD FOR THE PRODUCTION OF TRIOXANE FROM A HIGHLY CONCENTRATED AQUEOUS FORMALDEHYDE SOLUTION, THE REACTION MIXTURE BEING STRIPPED FROM THE SYNTHESIS REACTOR IN A GASEOUS FORM AND BEING TRANSFERRED INTO A DISTILLATION COLUMN

摘要

The invention relates to a method for producing raw trioxane, comprising the following stages: - a highly concentrated aqueous formaldehyde solution is subjected to an acid catalyzed reaction so as to obtain a trioxane/formaldehyde/water mixture (stage I); and - the trioxane/formaldehyde/water mixture obtained in stage I is distilled in order to obtain raw trioxane (stage II). The inventive method is characterized in that the trioxane/formaldehyde/water mixture is stripped from the synthesis reactor (R) in a gaseous form in stage I.