Distillation: processes – separatory – Distilling to separate or remove only water – From organic compound
Patent
1990-07-27
1991-10-29
Manoharan, Virginia
Distillation: processes, separatory
Distilling to separate or remove only water
From organic compound
203 49, 203 82, 203 84, 203 87, 549368, B01D 334, C07D32306
Patent
active
050613499
ABSTRACT:
A method of isolating trioxane by distillative separation at atmospheric pressure without extraction steps from an aqueous trioxane solution having a trioxane concentration which does not exceed that concentration, which has an constant boiling azeotropic mixture obtained at a simple distillation of said aqueous trioxane solution at normal pressure, includes heating the aqueous trioxane solution, which may also contain formaldehyde and acid, in an evaporator to form a trioxane and water vapor-containing steam mixture substantially of the azeotrope boiling temperature (about 92.degree. C. for a solution containing only water and trioxane); feeding an inert gas stream into either the evaporator or a partial condenser connected directly to the evaporator; leading the steam mixture in a first stage together with the inert gas stream through the partial condensing means, wherein the steam mixture together with the inert gas stream is cooled to a temperature of 58.degree. to 64.degree. C. and a water portion of the steam mixture is partially condensed together with the formaldehyde, if present, and separated; then in a second stage leading the steam mixture together with the inert gas stream through a condenser, wherein the trioxane portion is condensed together with the remaining water portion and separated from the inert gas stream to form a trioxane concentrate having a trioxane concentration which is greater than that of the azeotropic mixture. Pure trioxane can then be obtained by simply distilling.
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Kuppenbender Herbert
Reis Helmut
Manoharan Virginia
Striker Michael J.
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