| 摘要 |
THE INVENTION RELATES TO A CONTINUOUSLY OPERATED PROCESS FOR THE PURIFICATION BY DISTILLATION OF THE 1,2-PROPYLENE GLYCOL FORMED AS BY-PRODUCT IN THE SYNTHESIS OF PROPYLENE OXIDE, WHEREIN THE MIXTURE FORMED IN THE SYNTHESIS WHICH CONTAINS THE 1,2PROPYLENE GLYCOL IS SEPARATED IN A DIVIDING WALL COLUMN INTO LOW-, INTERMEDIATE- AND HIGH-BOILING FRACTIONS AND THE 1,2-PROPYLENE GLYCOL IS TAKEN OFF AS INTERMEDIATE BOILER AT THE SIDE OFF TAKE OF THE COLUMN.
|
