Method for the purification of dimethylacetamide (DMAc)

Details Method for the purification of dimethylacetamide (DMAc) Method for the purification of dimethylacetamide (DMAc)

2004-04-05

2009-06-16

Manoharan, Virginia (Department: 1797)

Distillation: processes, separatory

With measuring, testing or inspecting

Of temperature or pressure

C203S099000, C203SDIG019, C564S216000

Reexamination Certificate

active

07547378

ABSTRACT:
The invention relates to a process for distillatively purifying crude dimethylacetamide (crude DMAc) comprising DMAc, low boilers and high boilers5by 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.

REFERENCES:
patent: 3300531 (1967-01-01), James et al.
patent: 3557207 (1971-01-01), Hammond et al.
patent: 3687820 (1972-08-01), Akell et al.
patent: 6946060 (2005-09-01), Gentilcore
patent: 1406279 (1965-06-01), None
patent: WO-2004/002926 (2004-01-01), None

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