Shell HCN/COS Hydrolysis Technology

The catalytic conversion of HCN and COS is a cost effective technology to abate the harmful effects these components have in gas streams.

This hydrolysis technology has three main fields of application:
1. Syngas treatment upstream of an amine unit for coal or oil gasification processes.
2. Other syngas treatments where HCN and/or COS presence is not acceptable to downstream processing units such as gas -to-liquid processes, e.g., the Shell middle distillate synthesis process.
3. FCC dry gas treatment to avoid problems in downstream treating units.

Shell HCN/COS Hydrolysis Technology

In the gasification process, for example, syngas is produced, which is mainly comprised of hydrogen and carbon monoxide. However, contaminants such COS and HCN are also formed. A deep removal of both these contaminants is not possible using “conventional” amine treating solvents. However, catalytic HCN/COS hydrolysis technology is a cost effective alternative to avoid the harmful effects of these compounds downstream of the process.

Syngas is water scrubbed for soot removal. Consequently, the water saturated gas is heated to a desired temperature before the syngas enters a HCN/COS hydrolysis reactor. In this reactor, catalytic hydrolysis of HCN and COS takes place to produce CO, H2S, CO2 and ammonia.

After the HCN/COS reactor, the syngas is first cooled and then fed into an ammonia scrubber to remove the water-soluble components. The condensed water is sent to water treatment and the syngas is routed to downstream processing units.

Licensor: Shell Global Solutions International B.V.

Posted in Gas

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