Method for the purification of dimethylacetamide (DMAc)
AssigneeBASF SE
InventorsWerner Peschel, Hartmut Schoenmakers, Klaus Althaus, Tanja Kirchner, Hartmut Staatz
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Abstract
The invention relates to a process for distillatively purifying crude dimethylacetamide (crude DMAc) comprising DMAc, low boilers and high boilers 5 by removing the low boilers and the high boilers to obtain pure DMAc in one of the column configurations listed hereinbelow: (I) a main column (MC) with sidestream column (SC) or (II) a dividing wall column (DWC), which operating at least the main column (MC) in column configuration (I) and the dividing wall column (DWC) in column configuration (II) at a top pressure in the range from 0.5 to 1.8 bar absolute.
Claims18
A process for distillatively purifying crude water-containing dimethylacetamide (crude DMAc) comprising DMAc, low boilers and high boilers removing the low boilers and the high boilers to obtain DMAc which is purer than crude DMAc, in one of the column configurations listed hereinbelow:
- (I) a main column (MC) with sidestream column (SC) or
- (II) a dividing wall column (DWC),
- which comprises operating at least the main column (MC) in column configuration (I) and the dividing wall column (DWC) in column configuration (II) at a top pressure in a range from 0.5 to 1.8 bar absolute.
Dependencies are inferred from the claim text.