Production of clean HCN-free synthesis gas

Gas: heating and illuminating – Processes – Fuel mixtures

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48206, 55 68, 252373, 423236, C10K 110

Patent

active

041893077

ABSTRACT:
Clean HCN-free synthesis gas is produced from raw synthesis gas leaving a partial-oxidation gas generator by a continuous process comprising the steps of partial cooling, scrubbing with condensate, cooling below the dew point by indirect heat exchange preferably with a rich liquid absorbent from a downstream acid-gas-removal zone, and scrubbing with cold aqueous absorbent. The rich HCN-containing aqueous absorbent is then safely processed, without polluting the environment. For example, the HCN-containing aqueous absorbent may be stripped or reacted in the gas generator. Optionally, other acid gases, if present, may be removed from the synthesis gas in said acid-gas-removal zone.

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