Gasification process employing acid gas recycle
AssigneeHaldor TopsøE A/S
InventorFrançois-Xavier Pascal Thierry Chiron
Life of this patent
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Abstract
A method for converting a feedstock comprising solid hydrocarbons to a sweet synthesis gas, involving the steps a. gasifying said feedstock in the presence of steam, an oxygen rich gas and an amount of sour process gas to form a raw synthesis gas optionally comprising tar, b. optionally conditioning said raw synthesis gas to a sour shift feed gas, c. contacting said sour shift feed gas with a sulfided material catalytically active in the water gas shift process for providing a sour hydrogen enriched synthesis gas, d. separating H2S and CO2 from said sour hydrogen enriched synthesis gas, for providing said sour recycle gas and a sweet hydrogen enriched synthesis gas.
Claims18
A method for converting a feedstock comprising solid hydrocarbons to a sweet hydrogen enriched synthesis gas, involving the steps
- a. gasifying said feedstock in the presence of steam, an oxygen rich gas and an amount of sour process gas to form a raw synthesis gas,
- b. optionally conditioning said raw synthesis gas and providing said optionally conditioned raw synthesis gas as a sour shift feed gas,
- c. contacting said sour shift feed gas with a sulfided material catalytically active in the water gas shift process for converting the sour shift feed gas to a sour hydrogen enriched synthesis gas,
- d. separating H2S and CO2 from said sour hydrogen enriched synthesis gas, such that the sour hydrogen enriched synthesis gas is separated into two gases of different composition:
- i. said sour process gas comprising the separated H2S and CO2;
- and
- ii. the sweet hydrogen enriched synthesis gas,
- wherein the concentration of sulfur in a combination of said feedstock, said steam, and said oxygen rich gas is less than the concentration of sulfur in the raw synthesis gas.
Dependencies are inferred from the claim text.