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Purifying method for carbon dioxide containing air flow

A technology of carbon dioxide and gaseous state, applied in the direction of organic chemical methods, chemical instruments and methods, separation methods, etc., can solve the problems of increasing the replacement frequency of potassium carbonate

Inactive Publication Date: 2002-03-13
THE BRITISH PETROLEUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The presence of potassium acetate in the carbon dioxide removal system also results in the need for increased potassium carbonate changes and thus increased process interruptions due to system emptying and potassium carbonate replenishment

Method used

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  • Purifying method for carbon dioxide containing air flow
  • Purifying method for carbon dioxide containing air flow

Examples

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Embodiment Construction

[0043] use as figure 1 As described, but without feeding acetic acid to the scrubber, the reactor was filled with palladium / gold catalyst on silica. A potassium acetate co-catalyst solution was injected from the inlet of the reactor. The reactor was operated at 160°C and 120 psig (8 barg). The mole percentage of the total feed composition entering the catalytic bed is ethylene: oxygen: acetic acid: inert gas 56:5:16:5.

[0044] The gas exiting the reactor was passed to an absorption column operated at 7 barg and 30-40°C and quenched with recycled acetic acid. The gaseous by-products are fed to the scrubber together with 40Kg / hr of water. The scrubbed gaseous fraction was passed to a Benfield carbon dioxide removal unit filled with potassium carbonate solution to remove carbon dioxide. The solution containing absorbed carbon dioxide is passed to a stripper where the carbon dioxide is stripped and evacuated to the atmosphere, and the regenerated potassium carbonate solution ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14C01B32/50C07B61/00C07C67/055C07C67/48C07C67/58C07C69/15
CPCC07C67/48Y02C10/06C07C67/05Y02C20/40C07C69/01C07C69/15B01D53/14
Inventor K·德波伊蒂尔斯S·A·亨尼甘
Owner THE BRITISH PETROLEUM CO LTD
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