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Abstract

The selective removal of H-2S from gaseous mixtures containing CO-2 is a problem which has been examined for a long time and which is not yet efficiently solved. The object of our research concerns a highly selective process based on the reactivity difference between H-2S and CO-2 towards tertiary amines in suitable anhydrous solvents, with energetic advantages since CO-2 is left in the main gas stream. Possible applications are very numerous in the field of natural gas and in the preparation of synthesis gas. An experimental laboratory work has been carried out concerning said selective separation of H-2S. Various amine - solvent combinations have been tested and, from vapour - liquid equilibrium determinations at various pressures and temperatures a selection among different absorbing media has been made. Subsequently the best amine - solvent combinations have been studied in a pilot plant in order to collect further information on their behaviour and on the real possibility of using them in an industrial plant. Particularly, at standard conditions, tests have been carried out to determine and compare the minimum ratio acid gas feed - solvent stream that allows the recovery from the top of the column of a gaseous stream with <or= 1 mu H-2S discharged from the bottom of the absorber with the minimum amount possible of CO-2.

Additional information

Authors: RESCALLI C SNAMPROGETTI S.P.A., SAN DONATO MILANESE (ITALY), SNAMPROGETTI S.P.A., SAN DONATO MILANESE (ITALY)
Bibliographic Reference: EUR 9546 IT (1985) MF, 50 P., BFR 150, BLOW-UP COPY BFR 250, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
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