Purifying method for carbon dioxide containing air flow

Abstract

A process for removing at least one compound selected from acetic acid, acetate esters and aldehydes from a gaseous fraction comprising carbon dioxide and such compounds. The process comprises the steps of (a) scrubbing in a scrubber at least part of the gaseous fraction to remove the acetic acid, acetate esters and / or aldehydes and (b) removing carbon dioxide from the scrubbed product of step (a) in step (a) the gaseous fraction is scrubbed with water and acetic acid. The process may be used to remove acetate esters such as vinyl acetate and ethyl acetate and aldehydes such as acetaldehyde. The process may be used in (i) the manufacture of vinyl acetate by the reaction of ethylene, acetic acid and an oxygen-containing gas in the presence of a catalyst or (ii) in the catalytic oxidation of (a) ethane and / or (b) ethylene to produce respectively (a) acetic acid and / or ethylene and (b) acetic acid.

Description

technical field

[0001] The invention relates to a method for removing acetic acid and / or acetates and / or aldehydes from a gaseous carbon dioxide stream containing one or more of these compounds, in particular, the invention relates to the removal of acetic acid and / or acetates and / or aldehydes from A method for removing the aforementioned compounds from gaseous carbon dioxide streams produced during the production of vinyl acetate with oxygen-containing gases and during the oxidation of ethane and / or ethylene. Background technique

[0002] Typically, in the oxidation of alkenes, such as ethane and / or ethylene to acetic acid, the resulting gaseous fraction contains by-product carbon dioxide which also contains acetic acid. Carbon dioxide is removed from the gaseous fraction by absorption with aqueous potassium carbonate and desorbed by stripping before venting to the atmosphere. Acetic acid is usually removed from the carbon dioxide fraction by gas scrub...

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