Removal of acidic components of associated petroleum gas by pertraction on microporous membranes
UDK: 622.276.1/.4
Key words: associated petroleum gas, pertraction, microporous membranes, carbon dioxide, hydrogen sulfide, mercaptans
Authors: D.I. Petukhov, A.A. Poyarkov, E.A. Chernova, A.V. Lukashin, A.A. Eliseev (Lomonosov Moscow State University, RF, Moscow), E.S. Pyatkov, V.N. Surtaev (Rosneft Oil Company PJSC, RF, Moscow)
In the current study the efficiency of utilization of microporous hollow-fiber membrane contactors made of polyvinylidenfluoride, polysulfone, polyethersulfone and polypropylene with hydrophobic and hydrophilic surfaces was analyzed for acidic components removal during pertraction process. An ultimate efficiency of CO2 capture of 0,23 nm3/(m2·h) was illustrated for polypropylene hollow-fibers, having a packing density of 3200 m2/m3, which corresponds to a specific volumetric performance of acid gas removal up to 750 nm3/(m3·h). Polypropylene hollow-fiber membranes were used in the pertraction module of a pilot plant for associated petroleum gas conditioning. This module provides the purification of feed gas stream from carbon dioxide, hydrogen sulphide and mercaptans. Pilot plant consisting of pertraction module and capillary condensation module allows conditioning of the feed stream with a pressure of 0.6 MPa and a fluxex of 13.4 nm3/h to the requirements of STO Gazprom 089-2010. Proposed method allowed to reduce the content of carbon dioxide from 8,47 vol. % to 0.26 vol. % The total sulfur content in the purified gas was reduced below 0,4 mg/m3, while containing 0,2 vol. % H2S and 50 mg/m3 CH3SH in a feed stream. This allows utilization of the proposed technology for conditioning of associated petroleum and natural gas for piping in accordance with the requirements of STO Gazprom 089-2010.
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