Method and device for separating a mixture of at least hydrogen, nitrogen, and carbon monoxide by cryogenic distillation
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United States of America Patent
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Oct 15, 2013
Grant Date -
Mar 25, 2010
app pub date -
Dec 12, 2007
filing date -
Dec 21, 2006
priority date (Note) -
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Abstract
The invention relates to a method and apparatus for separating a mixture containing carbon monoxide, nitrogen and hydrogen by cryogenic distillation in a separation system which includes a denitrification column and at least another column. The method can include separating the mixture in order to obtain a fluid enriched with carbon monoxide and containing nitrogen, separating the fluid in the denitrification column, pressurizing the carbon monoxide flow from the column in a compressor up to a high pressure, collecting a fraction of carbon monoxide flow to be used as a product, expanding an amount of the high-pressure carbon monoxide flow in a valve prior to supplying it to the denitrification column, and varying the flow expanded in the valve according to re-boiling needs of the denitrification column.
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