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Gas Separation System with Elevated Pressure Feed

IP.com Disclosure Number: IPCOM000073581D
Publication Date: 2005-Feb-22
Document File: 2 page(s) / 29K

Publishing Venue

The IP.com Prior Art Database

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Gas Separation System with Elevated Pressure Feed

A process is disclosed for a heat exchange system to feed a gas separation system (for example cryogenic air separation distillation columns) with a cold (below ambient temperature) feed, reheat its products and vaporise at least one liquid product (for example liquid oxygen) in which

1)     All the feed is compressed to a first pressure higher than the highest vapor feed pressure to the separation system cooled to ambient or near-ambient temperature and optionally purified to remove contaminants that would freeze out in the heat exchange system.

2)     A first part of the feed at the first pressure is optionally cooled in the heat exchange system and further compressed to a second pressure with optional intercooling and/or aftercooling outside or within the heat exchange system.  It is then cooled in the heat exchange system so that it condenses or pseudo-condenses and expanded to form a substantially liquid feed to the separation system.

3)     A second part of the feed at the first pressure is cooled in the heat exchange system, withdrawn as a vapor at an intermediate temperature and expanded to the separation system with the performance of external work

4)     A third part of the feed at the first pressure is cooled in the heat exchange system so that it condenses and expanded to form a substantially liquid feed to the separation system.

One example is shown below,

The process is suitable when the total liquid production from the gas separation system is a large or small proportion of the feed, even when it is less than about 1% of the feed flow.  If the proportion of liquid is small, it will be particularly advantageous to cool the first part of the feed air before it is further compressed.

Most of the net power input to the process is in the feed compressor to bring the feed to the first pressure.

The expander and boo...