A process and relating apparatus to make pure hydrogen from a syngas originated from wastes gasification
AssigneeNextchem S.P.A.
InventorsGaetano IAQUANIELLO, Annarita SALLADINI, Elena ANTONETTI
Life of this patent
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Abstract
A raw syngas coming from HT gasification of organic wastes, once cooled in a proper heat recovery boiler or in a quencher is treated in a scrubbing section where, by adding an acidic solution followed by alkaline solution and by a WESP, particulate and chlorine compounds are removed and the syngas is ready for conversion, after its compression. In the conversion step CO is converted into C02 and H2 by adding steam; H2S is reduced to sulphur in a solid form, C02 is removed via cryogenic unit or an amine unit and pure H2 is produced.
Claims20
A process for making Hydrogen from a syngas produced from carbon-matrix waste gasification, without any emission of nitrogen and sulphur, comprising the following steps:
- a pretreatment step (210) to remove from the raw syngas particulate and the bulk of metals, chlorine and NH3 compounds
- a conversion step (220) where HCN, CO and COS present in the pretreated syngas are converted into N2, CO2 and H2S in presence of H2S;
- a removal step (230) where H2S is removed from syngas and then transformed in elementary S;
- a purification step (240) where CO2 is removed via a cryogenic unit or amine step, and pure Hydrogen is produced by a PSA unit,
- wherein the H2S level into the syngas is controlled by eventually adding waste containing S into the gasification reactor.
An apparatus for make pure hydrogen from a syngas originated from wastes gasification, without any emission of nitrogen and sulphur, comprising:
- a pretreatment section (210) to remove from the raw syngas particulate and the bulk of metals, chlorine and NH3 compounds
- a conversion section (220) where HCN, CO and COS present in the pretreated syngas are converted into HCN, CO2 and H2S in presence of H2S;
- a removal unit (230) where H2S is removed from syngas and then transformed in S;
- a purification section (240) where CO2 is removed via a cryogenic unit or amin unit and pure Hydrogen is produced by a PSA unit, and
- means to control the H2S level into the syngas by eventually adding waste containing S into the gasification reactor.
Dependencies are inferred from the claim text.