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US 4,064,218 AGranted
Removal of phosgene from off-gases
AssigneeBASF SE
InventorsHeinrich Scholz, Martin Decker, Franz Neumayr
Life of this patent
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Abstract
Process for the removal of phosgene from an off-gas in which it is present in small quantities, by washing with an aqueous solution of alkali and ammonia.
Claims4
A process for removing phosgene from off-gas which comprises washing the off-gas with an aqueous solution containing from 1 to 50% by weight of sodium hydroxide or potassium hydroxide and from about 0.1 to 10% by weight of ammonia, said washing step being carried out at a temperature of from about 10.degree. to 100.degree. C.
Dependencies are inferred from the claim text.