Patent ID: 6433194
Filing Date: 2002-08-13
Classification: C07D

Abstract:
A process for the recovery of trioxane, in which the trioxane is transferred from a liquid mixture comprising trioxane, formaldehyde, alcohol, hemiformals formed from the formaldehyde and the alcohol, usual secondary components arising in the preparation of trioxane, and, in addition or as an alternative to the alcohol and the hemiformals, water and reaction products formed from formaldehyde and water, into the gas phase by volatilization or evaporation and subsequently converted into a liquid state by condensation and isolated as condensate or converted into a solid state by desublimation and isolated as desublimate, and wherein the condensate or the desublimate has a trioxane content which is at least 2.5 times as high as the trioxane content in the liquid mixture, and wherein the process is carried out using a carrier gas.