Process for separating trioxane

Details Process for separating trioxane Process for separating trioxane

1981-06-08

1982-06-01

Sever, Frank

Distillation: processes, separatory

With disparate physical separation

Utilizing liquid-liquid extracting of distillation product

203 69, 549368, B01D 334, B01D 1104

Patent

active

043326447

ABSTRACT:
In a process for separating trioxane by a continuous distillation which comprises extracting, with benzene, the trioxane-containing distillate obtainable by heating an aqueous solution of formaldehyde, feeding the trioxane-containing benzene solution into a distillation column as a starting material, distilling out the benzene from the column top and withdrawing the trioxane from the column bottom, a process for separating trioxane which comprises retaining the concentration of trioxane X in the liquid composition at the starting material feeding plate of the distillation column (% by weight of trioxane based on the total liquid composition at the feeding plate) in the range satisfying the following relationship: ##EQU1## wherein R is reflux ratio, and .gamma. is a parameter defined by the following equation: ##EQU2## wherein q is the proportion of liquid part in the fed starting material as expressed in terms of ratio by weight and C (%) is the concentration of trioxane in the fed starting material.

REFERENCES:
patent: 3201419 (1965-08-01), Sennewald et al.
patent: 3313713 (1967-04-01), Martin
patent: 3395157 (1968-07-01), Dankert et al.

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