Method and apparatus for treating offgases in a acetic acid production unit
AssigneeBP Chemicals Limited
InventorsTimothy Crispin Bristow, Paul David Williams
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Abstract
A method for scrubbing off-gas generated in production units for the manufacture of acetic acid and an apparatus therefor. The method comprises supplying off-gas and acetic acid solvent at a tick-over flow rate to an acetic acid scrubbing unit, withdrawing off-gas from the scrubbing unit, supplying withdrawn off-gas to a methanol scrubbing unit, scrubbing the off-gas therein with methanol solvent and withdrawing scrubbed off-gas from the methanol scrubbing unit.
Claims17
A method of operating an off-gas scrubbing system in an acetic acid production unit which acetic acid production unit generates off-gas comprising methyl iodide, said production unit comprising a reactor, a light ends recovery section comprising a light ends column, an acetic acid scrubbing unit and a methanol scrubbing unit which method comprises:
- (i) supplying off-gas and acetic acid to the acetic acid scrubbing unit and withdrawing off-gas therefrom;
- (ii) supplying withdrawn off-gas and methanol to the methanol scrubbing unit and contacting the off-gas and methanol therein to produce scrubbed off-gas;
- and
- (iii) withdrawing from the methanol scrubbing unit scrubbed off-gas;
- wherein the acetic acid is supplied to the acetic acid scrubbing unit at a tick-over flow rate.
Dependencies are inferred from the claim text.