METHOD OF REMOVAL OF CARBONYL COMPOUNDS ALONG WITH ACID GASES FROM CRACKED GASES IN ETHYLENE PROCESS

摘要

METHOD OF REMOVAL OF CARBONYL COMPOUNDS ALONG WITH ACID GASES FROM CRACKED GASES IN ETHYLENE PROCESS The invention relates to method of removal of carbonyl compounds, not only like acetaldehyde and others, but also polymeric deposits formed on internal surfaces of caustic scrubber in ethylene process. Earlier patents disclose compounds for inhibiting polymerization. As efficiency of inhibition is never 100 %, unterminated carbonyl compounds polymerize, separate out from system and form deposits on internal surfaces of scrubber, ultimately plugging and fouling equipment. This leads to huge production / commercial / financial losses, as the plant is to be shut down for cleaning for long time - interval. The invention comprises introducing premixed additives into feed stream of caustic wash unit, wherein effective amount of additive comprises of sodium diothionite salts and sodium metabisulfite and / or combination thereof, with aliphatic / aromatic amino acid, or lactam, and agitate and heat the mixture, thereby inhibiting polymerization and also dissolving polymeric deposits being formed or already formed. The method is useful for continuous running of caustic / amine scrubber, without any need of shutting down the unit for cleaning.