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AssigneeInstitut Francais du Petrole
InventorsJean-Claude Mileo, Christian Busson, Claude Dezael, Jean-Charles Viltard, Christophe Berat
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A process for the extraction of hydrogen sulphide from a gas mixture comprises: a step (a) in which the gas mixture is passed into an aqueous acidic solution of copper sulphate under conditions which lead to the formation of copper sulphide; a gas which is highly depleted in hydrogen sulphide and an aqueous phase containing copper sulphide in suspension are recovered; a step (b) in which the copper sulphide contained in suspension in the aqueous phase from step (a) is oxidised using an oxygen-containing gas under conditions which lead to the formation of solid elemental sulphur and soluble copper sulphate from this liquid phase; and a step (c) in which the solid sulphur and the solid copper sulphide which is not transformed during step (b) are separated and at least a portion of the aqueous acidic phase containing the copper sulphate formed during step (b) is optionally recycled to step (a). The process is used to absorb hydrogen sulphide contained in a variety of industrial gases.
A process for the extraction of hydrogen sulphide from a gas mixture comprising:
A process according to 2, in which the oxidation of the copper sulphide during (b) is carried out at a temperature of about 40.degree. C. to about 95.degree. C.
A process according to 4, in which the oxidation of the copper sulphide during (b) is carried out using the suspension from (a) containing about 1.5 to about 6 moles per liter of sulphuric acid and at a temperature of about 40.degree. C. to about 95.degree. C.
Dependencies are inferred from the claim text.