Processing In-Situ Oil Shale Retort Offgas with a Stretford Plant at Geokinetics

摘要

The paper discusses the use of EPA's transportable Stretford process pilot plant on a 700-acfm slipstream of in-situ shale oil retort offgas to investigate H2S removal efficiency and process compatibility. This was the fourth application of the pilot plant which had demonstrated a continuously improving performance. During this test, the pilot plant was operated first with a venturi contactor alone and then with the venturi followed in series by a packed tower contactor. With the venturi alone, the plant achieved 95% removal efficiency, but its average performance was lower. With the addition of the packed tower, the removal efficiency reached 99+%. Excessive foaming of the process solution was experienced which was attributed to the presence of organic aerosol in the retort offgas.