Thermal treatment for removal of contaminants from aqueous...

C - Chemistry – Metallurgy – 02 – F

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C02F 1/02 (2006.01) C02F 1/58 (2006.01)

Patent

CA 2175937

A method of controlling the build-up of organic and/or inorganic contaminants (e.g., carbonates, nitrates, nitrites, and the like) in an aqueous process stream, comprising directing at least some of the contaminated stream to a heating means wherein at least some of the contaminants are decomposed. Thereafter, the decomposition products are removed and the purified stream is returned to the process. In a preferred embodiment, the process is an alkylene oxide manufacturing process, and the contaminated aqueous stream is the effluent from a catalyzed scrubbing system for removal of carbon dioxide. Organic contaminants are decomposed to carbon dioxide, which is flashed off; inorganic salts which are decomposed to gases are flashed off; inorganic salts which are not converted to gases are scrubbed out.

Une méthode pour prévenir l'accumulation de contaminants organiques et/ou inorganiques (p. ex. carbonates, nitrates, nitrites, etc.) dans un circuit aqueux, comprenant l'acheminement d'au moins une partie du circuit contaminé dans un système de chauffage où au moins une partie des contaminants est décomposée. Les produits de décomposition sont ensuite éliminés et le circuit purifié est retourné dans le procédé. Une application préférée concerne un procédé de fabrication d'oxyde d'alcénylène dans lequel le circuit contaminé aqueux est l'effluent provenant d'un système d'épuration par catalyse pour éliminer le dioxyde de carbone. Les contaminants organiques sont décomposés en dioxyde de carbone, qui sont éliminés par évaporation; les sels inorganiques qui sont décomposés en gaz sont éliminés par évaporation; les sels inorganiques qui ne sont pas convertis en gaz sont éliminés par épuration.

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