Page 274 - Petroleum and Gas Field Processing

Figure 1 Selection of gas-sweetening processes.

If the sulfur recovery is an option, then a direct conversion process can
be used. They are only selective for H 2 S. Stretford, Lo Cat, and Sulferox are
some of the process used for removal of H 2 S from natural gas. In the case of
the regeneration of solid fixed beds or amine regeneration units,
concentrated streams of H 2 S are obtained. In these cases, the Claus process
will be the most suitable for sulfur recovery.
Figure 1 can be used as a guide for the selection of the
proper process depending on the acid–gas concentration in the feed and
the required degree of acid removal and its concentration in the outlet
stream, after Tennyson and Schaff [1]. However, final selection should
consider environmental, economical, and any other considerations.

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