| 摘要 |
<p>The objective of the present invention is to increase the yield and selectivity of trioxane and to minimize the amount of unreacted formaldehyde when producing trioxane from an aqueous formaldehyde solution. In this production method, formaldehyde gas is generated by pyrolyzing a hemiformal concentrate obtained from an aqueous formaldehyde solution and alcohol, and using a solid acid catalyst, reaction generated gas containing trioxane is obtained from the formaldehyde gas. Then, by contacting the reaction generated gas with an organic solvent, the trioxane and the unreacted formaldehyde gas that are contained in the reaction generated gas are separated into gas and liquid, and the separated unreacted formaldehyde gas is circulated and recycled by being added to the system for obtaining the reaction generated gas.</p> |
