| 摘要 |
Disclosed is an apparatus for producing acetic acid, said apparatus comprising: (a) a reactor for carbonylating methanol or its reactive derivatives in the presence of water, a catalyst selected from rhodium catalysts, iridium catalysts and mixtures thereof, and a methyl iodide promoter to form an acetic acid reaction mixture in a reactor; (b) a flasher apparatus coupled to the reactor and adapted to receive a stream of the reaction mixture and separate it into (i) a liquid recycle stream, and (ii) a crude product stream containing acetic acid; (c) a light ends column coupled to the flasher, which is configured to separate low boiling components from the crude product stream, and generate a purified product stream, the light ends column having a distillation zone with an upper portion, a lower portion and a central portion, the central portion of the distillation zone having a product sidedraw for feeding the purified product stream forward; (d) a condenser communicating with the upper portion of the light ends column adapted to condense vapour received therefrom to generate a condensed vapor stream; (e) a decanter communicating with the condenser adapted to decant the condensed vapour stream into a light phase condensed stream and a heavy phase condensed stream comprising predominantly methyl iodide, the decanter being further adapted to provide at least a portion of the heavy phase condensed stream to the upper portion of the light ends column as reflux; and (f) a dehydrating column coupled to the light ends column for receiving and further purifying the purified product stream. |
