Design for ultra-high-pressure H2S removal from natural gas

P. Roberts, formerly with Advisian, WorleyParsons, Twickenham, UK What are the pressure design limits for natural gas H2S removal and associated dehydration facilities? This question was asked in the search for facility designs to remove H2S from sour gas at a pressure of 160 bara. The inlet gas to the facility is at 160 bara, and it requires export with minimum pressure loss for reinjection. The existing facilities consist of mixed metal oxide beds to remove low levels of H2S and non-regenerable molecular sieve beds to remove the water formed in the reaction to remove H2S. The level of H2S increased over time, and was close to exceeding the capacity of the beds. The decision was made to