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Method for the removal of acid gases from a residual gas of an alcohol synthesis

A technology for synthesis of residual gas and alcohol, which is applied in separation methods, gas treatment, chemical instruments and methods, etc., and can solve problems such as adverse economic effects

Inactive Publication Date: 2013-06-12
LINDE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But its operation causes some problems that may adversely affect its economics

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  • Method for the removal of acid gases from a residual gas of an alcohol synthesis

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Embodiment Construction

[0018] A sulfur-free residual gas 1 containing hydrogen, carbon monoxide and carbon dioxide is withdrawn from an alcohol synthesis M, for example a methanol synthesis, and is cooled in a heat exchanger E1 opposite to the process stream to be heated. The cooled residual gas is conducted via line 2 into the lower part of the absorption column A and then guided upwards therein. Liquid, low-temperature methanol is supplied to the top of the absorption column A as a scrubbing agent, which on its downward path comes into intensive contact with the residual gas conducted in countercurrent, where mainly carbon dioxide is absorbed. A substantially carbon dioxide-free gas mixture consisting essentially of hydrogen and carbon monoxide can thus be discharged via line 4 . After being heated in the heat exchanger E1 against the residual gas 1 to be cooled, this gas is sent via line 5 as feedstock to the alcohol synthesis plant M for substance use. Sending this gas to other applications is ...

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Abstract

The invention relates to a method for separating off carbon dioxide (11) from a gas mixture (1) containing hydrogen, carbon monoxide and carbon dioxide, which gas mixture is produced as residual gas (1,2) in an alcohol synthesis (M). The residual gas is subjected to a physical gas scrubbing (A) in which carbon dioxide is scrubbed out of the residual gas (1,2) in an absorption step by means of a low-temperature alcohol used as the scrubbing medium.

Description

technical field [0001] The invention relates to a process for separating carbon dioxide from a gas mixture comprising hydrogen, carbon monoxide and carbon dioxide which is produced as residual gas during alcohol synthesis, wherein the residual gas is scrubbed. Background technique [0002] Alcohols, such as ethanol, propanol, butanol and especially methanol, are synthesized on an industrial scale from hydrogen and carbon monoxide and / or carbon dioxide. To this end, a sulfur-free synthesis gas containing hydrogen, carbon monoxide and carbon dioxide is introduced at a pressure generally between 40 and 150 bar into a synthesis cycle, in which an alcohol-containing product stream is produced catalytically. By condensing out the alcohol formed and the water produced during the synthesis, the unreacted gas components are separated from the product stream and returned in large part to the synthesis cycle. A small portion is vented as residual gas in order to prevent excessive enri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14
CPCB01D2256/16B01D2256/20Y02C10/04Y02C10/06B01D2252/2021B01D53/1493B01D53/1475Y02C20/40
Inventor H·魏斯A-M·菲舍尔
Owner LINDE AG