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Process and Apparatus for Separation of Nitrogen from Carbon Monoxide

IP.com Disclosure Number: IPCOM000019395D
Publication Date: 2003-Sep-12
Document File: 3 page(s) / 101K

Publishing Venue

The IP.com Prior Art Database

Abstract

In a cryogenic process for separation of carbon monoxide from hydrogen, nitrogen, and methane, overhead carbon monoxide from a carbon monoxide/methane separation column is warmed, compressed, and at least part is recycled to the process to provide heat pump duty. Part of the recycled carbon monoxide is condensed and fed to a nitrogen/carbon monoxide separation column where it is separated into a nitrogen enriched overhead fraction and a nitrogen depleted carbon monoxide bottom liquid. Another part of the recycled carbon monoxide is condensed and used as reflux for the carbon monoxide/methane separation column.

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Process and Apparatus for Separation of Nitrogen from Carbon Monoxide

In a cryogenic process for separation of carbon monoxide from hydrogen, nitrogen, and methane, overhead carbon monoxide from a carbon monoxide/methane separation column is warmed, compressed, and at least part is recycled to the process to provide heat pump duty. Part of the recycled carbon monoxide is condensed and fed to a nitrogen/carbon monoxide separation column where it is separated into a nitrogen enriched overhead fraction and a nitrogen depleted carbon monoxide bottom liquid. Another part of the recycled carbon monoxide is condensed and used as reflux for the carbon monoxide/methane separation column.

At least part of the reboiler and condenser duties for the nitrogen/carbon monoxide separation column are provided by part of the recycled carbon monoxide heat pump stream. Compared to the prior art, the operating pressure of the nitrogen/carbon monoxide separation column is higher than the operating pressure of the carbon monoxide/methane separation column. The condenser duty for the nitrogen/carbon monoxide separation column is provided by vaporising carbon monoxide at a pressure at least as high as the carbon monoxide/methane separation column pressure. This vaporised carbon monoxide then mixes with the overhead carbon monoxide from the carbon monoxide/methane separation column for warming and delivery to the compressor suction.

Figure 1 shows a typical application of this idea. Syngas feed is cooled and partly condensed in heat exchangers 1 and 2. Carbon monoxide is recovered by scrubbing with liquid methane in column 3. Hydrogen is stripped from the liquid from column 3 and liquid condensed from the feed in column 4. The hydrogen stripped liquid is then separated in column 5 to produce carbon monoxide and methane. The carbon monoxide forms the heat pump fluid and optionally an impure CO product. Part of the heat pump fluid is separated...