Caustic tower trap for acetaldehyde

B - Operations – Transporting – 01 – D

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B01D 53/40 (2006.01) C07C 4/04 (2006.01) C07C 7/11 (2006.01) C07C 7/20 (2006.01) C10G 19/02 (2006.01) C10G 70/06 (2006.01) C10G 75/04 (2006.01)

Patent

CA 2212684

A method of inhibiting the formation of fouling deposits occurring on the surfaces of an alkaline scrubber used to wash acid gases generated during the manufacture of olefins, which deposits are formed during the scrubbing of pyrolytically produced hydrocarbons contaminated with oxygen-containing compounds with a caustic solution having a pH >7, which comprises adding an effective depositing-inhibiting amount of a caustic solution-soluble substituted aromatic amine selected from the group consisting of: 2-aminophenol, 4-aminophenol, 4-aminobenzenesulfonic acid and salts thereof, 4-amino-~-cresol, 3-aminophenol, 2-aminobenzoic acid and salts thereof, 3-aminobenzoic acid and salts thereof, and 4-aminobenzoic acid and salts thereof to the caustic solution. A preferred substituted aromatic amine is the sodium salt of 4-amino- benzenesulfonic acid in aqueous solution.

Méthode pour empêcher la formation de dépôts d'encrassage à la surface d'un épurateur alcalin utilisé pour laver les gaz acides produits par la préparation d'oléfines - ces dépôts se forment lors de la production pyrolytique d'hydrocarbures contaminés par des composés oxygénés - à l'aide d'une solution caustique possédant un pH >7; on ajoute une quantité - suffisante pour empêcher le dépôt - d'une amine aromatique avec substitution, soluble dans une solution caustique et choisie dans le groupe suivant : 2-aminophénol, 4-aminophénol, acide 4-aminobenzènesulfonique et ses sels, 4-amino-~-crésol, 3-aminophénol, acide 2-aminobenzoïque et ses sels, acide 3-aminobenzoïque et ses sels, acide 4-aminobenzoïque et ses sels. On privilégie comme amine aromatique avec substitution le sel de sodium de l'acide 4-amino-benzènesulfonique dans une solution aqueuse.

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