Control of nitrogen oxide reactions in off-gases from the...

Details Control of nitrogen oxide reactions in off-gases from the... Control of nitrogen oxide reactions in off-gases from the...

C - Chemistry, Metallurgy

01

B

260/152

C01B 21/00 (2006.01) B01J 8/00 (2006.01)

Patent

CA 1074301

ABSTRACT OF THE DISCLOSURE The deposition of an aromatic diazonium nitrate on the walls of a pipeline through which is conducted a residual gas produced in the diazotization of a primary aromatic mono- amine is prevented by heating the walls of the pipeline, limiting the residence time of the gas in the pipeline, or providing for the absence of nitrogen dioxide in the gas. Nitrogen dioxide can form in the pipeline when nitric oxide and molecular oxygen are present, but the deposition of the diazonium nitrate, formed from the nitrogen dioxide via a reaction with the monoamine, is prevented by the hot pipeline walls and/or short residence time.

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