A process to prepare elemental sulphur
AssigneePaqell B.V.
InventorsJohannes Bernardus Maria KLOK, Annemiek TER HEIJNE, Frederikus DE RINK, Cees Jan Nico BUISMAN
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Abstract
The invention is directed to a process to prepare elemental sulphur by (i) contacting an aqueous solution comprising bisulphide with oxidised sulphide-oxidising bacteria under anaerobic conditions wherein elemental sulphur is produced and a reduced sulphide-oxidising bacteria is obtained and (ii) wherein the reduced sulphide-oxidising bacteria are oxidised by transfer of electrons to an anode of an electrochemical cell to obtain the oxidised sulphide-oxidising bacteria.
Claims18
A process to prepare elemental sulphur by (i) contacting an aqueous solution comprising bisulphide with oxidised sulphide-oxidising bacteria under anaerobic conditions wherein elemental sulphur is produced and a reduced sulphide-oxidising bacteria is obtained and isolating elemental sulphur from the aqueous solution and (ii) wherein the reduced sulphide-oxidising bacteria are oxidised by transfer of electrons to an anode of an electrochemical cell to obtain the oxidised sulphide-oxidising bacteria.
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A process to improve the effectiveness to absorb hydrogen sulphide of an aqueous solution comprising oxidised and reduced sulphide-oxidising bacteria in a hydrogen sulphide absorption process by oxidising the reduced sulphide-oxidising bacteria by transfer of electrons to an anode of an electrochemical cell.
A process to treat a hydrogen sulphide comprising gas comprising the following steps:
- (a) contacting the hydrogen sulphide comprising gas with an aqueous solution comprising oxidised sulphide-oxidising bacteria thereby obtaining a loaded aqueous solution comprising bisulphide and oxidised sulphide-oxidising bacteria and a gas having a lower content of hydrogen sulphide,
- (b) contacting the loaded aqueous solution comprising bisulphide with oxidised sulphide-oxidising bacteria under anaerobic conditions wherein elemental sulphur is produced and a reduced sulphide-oxidising bacteria is obtained, and
- (c) oxidising the reduced sulphide-oxidising bacteria by transfer of electrons to an anode of an electrochemical cell to obtain the oxidised sulphide-oxidising bacteria for reuse in steps (a) and
- (d) isolating elemental sulphur from the aqueous solution obtained in any of steps (a)-(c).
Dependencies are inferred from the claim text.