| abstract |
A method of inhibiting the formation of fouling deposits occurring on the surfacesnof an alkaline scrubber used to wash acid gases generated during the manufacture ofnolefins, which deposits are formed during the scrubbing of pyrolytically producednhydrocarbons contaminated with oxygen-containing compounds with a caustic solutionnhaving a pH >7, which comprises adding an effective depositing-inhibiting amount of ancaustic solution-soluble substituted aromatic amine selected from the group consisting of:n2-aminophenol, 4-aminophenol, 4-aminobenzenesulfonic acid and salts thereof, 4-amino- o -cresol,n3-aminophenol, 2-aminobenzoic acid and salts thereof, 3-aminobenzoic acid andnsalts thereof, and 4-aminobenzoic acid and salts thereof to the caustic solution. Anpreferred substituted aromatic amine is the sodium salt of 4-amino- benzenesulfonic acidnin aqueous solution. |