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Hydrogen sulfide removal from sour associated gas

In November of 1999, PT Pertamina (Indonesia’s staterun oil company) installed the LO-CAT® II Hydrogen Sulfide Oxidation Process for their Mudi Field in East Java, Indonesia. The oil production operation at the Mudi field was producing up to 11 MMSCFD of sour associated gas. This associated gas was to be used to strip additional H2S from the sour crude and to generate power in 3 gas fired turbines.

Pertamina investigated several alternative sulfur recovery options, evaluating each in accordance with the following criteria:
• Gas capacity turndown requirement = 3:1
• H2S concentration turndown requirement = 3:1
• H2S in effluent gas £ 10 ppmv (removal efficiency = 99.9+%)
• Minimal operator attention
• Produce a sulfur product suitable for agricultural use
• Proven reliable process

The investigation led to the selection of the LO-CAT® II Hydrogen Sulfide Oxidation Process, designed and manufactured by Merichem located in Schaumburg, Illinois, USA

Pertamina’s custom built LO-CAT II unit was designed to remove 15 long tons per day (LT/D) of sulfur by treating 11 MMSCFD of sour associated gas, at 60 psig, containing 3.62 vol% H2S. The sour associated gas is directed to a coalescing filter, which removes liquid and aerosol hydrocarbons, prior to entering the liquid full absorber of the LO-CAT II.

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