Method for continuously operated pure distillation of oxiranes, especially propylene oxide
AssigneeBASF SE
InventorsPeter Bassler, Hans-Georg Goebbel, Joaquim Henrique Teles, Peter Rudolf
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Abstract
The invention relates to a continuously operated process for the purification by distillation of the oxirane formed in the oxirane synthesis by reaction of a hydroperoxide with an organic compound, wherein the crude oxirane is separated in a dividing wall column into low-, intermediate- and high-boiling fractions and the oxirane is taken off as intermediate boiler at the side offtake in a concentration of at least 99.9%.
Claims4
A continuously operated process for the purification by distilling a crude oxirane formed in an oxirane synthesis by reacting a hydroperoxide with an organic compound, the process comprising
- separating the crude oxirane by distilling the crude oxirane into low-, intermediate- and high-boiling fractions in a dividing wall column, and
- taking off purified oxirane as the intermediate boiler fraction at a side offtake,
- wherein the dividing wall column has from 30 to 120 theoretical plates,
- wherein the distillation is carried out at a temperature from 35 to 110° C. and a pressure from 1 to 10 bar, with the temperature being measured at the side offtake and the pressure being measured at the top of the column,
- and wherein the dividing wall column is configured as thermally coupled columns.
Dependencies are inferred from the claim text.