| 摘要 |
THE PRESENT INVENTION RELATES TO A PROCESS FOR DISTILLATIVELY REMOVING PURE TRIOXANE FROM A FEEDSTREAM (I) COMPRISING TRIOXANE IN A PROPORTION OF AT LEAST 50% BY WEIGHT, BASED ON THE TOTAL WEIGHT OF THE FEEDSTREAM (I), AND ADDITIONALLY FORMALDEHYDE AND WATER, WHICH COMPRISES FEEDING THE FEEDSTREAM I AND A FURTHER AQUEOUS STREAM (II) WHICH DOES NOT CONTAIN ANY COMPONENTS EXTRANEOUS TO THE FEEDSTREAM TO A DIVIDING WALL COLUMN (TWK1) HAVING A DIVIDING WALL TW WHICH IS ARRANGED SUBSTANTIALLY PERPENDICULARLY AND DIVIDES THE COLUMN INTERIOR INTO A FEED REGION (A1), A WITHDRAWAL REACTION (B1), AN UPPER COMBINED COLUMN REGION (C1) AND A LOWER COMBINED COLUMN REGION (D1), AND DRAWING OFF FROM THE FIRST DIVIDING WALL COLUMN (TWK1) A BOTTOM STREAM (III) COMPRISING PURE TRIOXANE AND A SIDESTREAM (IV) AT THE WITHDRAWAL REGION (B1), COMPRISING PURE WATER.FIG. 1
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