| 摘要 |
The invention relates to a process for preparing trioxane and at least one comonomer for preparing (co)polymers based on trioxane, in which, in a first step, formaldehyde the at least one comonomer reactant are reacted in aqueous solution to give trioxane and comonomer, to obtain a reaction mixture A 1 comprising trioxane, comonomer, formaldehyde and water, with or without comonomer reactant. In a second step, the reaction mixture A 1 is distilled in a first distillation stage at a first pressure to obtain a stream B 1 enriched in trioxane and comonomer and a stream B 2 comprising essentially water and formaldehyde, with or without comonomer reactant. In a third step, stream B 1 is distilled in a second distillation stage at a pressure which is above the pressure of the first distillation stage to obtain a stream C 1 comprising trioxane, comonomer and water and a product stream C 2 consisting essentially of comonomer and trioxane.
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