Method for removal of SO.sub.2 and NO.sub.x from combustion gase

Details Method for removal of SO.sub.2 and NO.sub.x from combustion gase Method for removal of SO.sub.2 and NO.sub.x from combustion gase

1988-11-21

1990-09-18

Heller, Gregory A.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

423242, C01B 1700, C01B 2100

Patent

active

049577166

ABSTRACT:
A process is provided for removing nitrogen oxides and sulfur dioxide from gaseous mixtures in the presence of a metal chelating agent. These gaseous contaminants are converted to hydroxylaminedisulfonates which are decomposed to ammonium ions and sulfate ions at pH of 4.2 or less. This decomposition step also converts the metal ion of the metal chelating agent to a reusable form. The ammonium ions are separated by column sorption, eluted and thermally reacted with nitrogen oxides to form nitrogen and water. The sulfate ions are removed as a sulfate salt precipitate.

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