PROCESS FOR THE REMOVAL OF FREE AMMONIA ENRICHED IN DEACIDIFICATION EVAPORATIONS IN THE WET WASHING OF HYDROGEN SULFIDE UNDER SIMULTANEOUS COMBUSTION OF HYDROGEN SULFIDE

摘要

1318393 Sulphur trioxide G WUNDERLICH and H WEBER 21 May 1970 [21 May 1969] 24646/70 Addition to 1055571 Heading C1A [Also in Division C5] In a process in which NH 3 and H 2 S are desorbed from washing liquor for coke oven gases and the desorbed gases are burnt to provide heat for steam-raising &c., the desorbed gases are separated into NH 3 largely free from H 2 S and H 2 S largely free from NH 3 and the separated gases burnt separately. The gaseous products of ammonia combustion, after being cooled in a waste heat boiler and freed of condensate, are added wholly or in part to the burnt H 2 S and subjected to wet catalytic oxidation to form SO 3 .