Ticona Gmbh

Dirk Scheid

Elke Schweers

Michael Rosenberg

Albert Reichl

Christine Meister

Michael Kleiber

Ioannis Nicolaou

Hagen Kniep

Dieter Sommerfeld

Wolfgang Nickelfeld

In a process for separating liquid mixtures comprising formaldehyde, trioxane, alcohol, hemiformal formed from the formaldehyde and the alcohol, usual minor components and up to 5% by weight of water, the liquid mixture is distilled batchwise or continuously at reduced pressure, atmospheric pressure or superatmospheric pressure in suitable apparatuses which are to be connected to one another in an appropriate manner, and the trioxane is produced in very high purity. The other materials of value, formaldehyde and alcohol, present in the mixture can likewise optionally be separated off and recycled or used otherwise, while the minor components are ejected.

Separation of liquid mixtures comprising formaldehyde, trioxane, alcohol and hemiformal

The invention relates to a method for separating a gaseous mixture comprising formaldehyde and trioxane, wherein at least some of the formaldehyde and the trioxane are dissolved from the mixture in a alcohol-containing liquid and the trioxane is crystallized from the solution thus obtained and is separated.

Separating off trioxane from gaseous mixtures with formaldehyde

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Waldems, Germany

Dirk Scheid