US 2012/0128569 A1 · DESTRUCTION OF AMMONIUM IONS

Abstract

The invention relates to a process for converting ammonium formed in a hydroxylamine phosphate oxime process into molecular nitrogen in an ammonium destruction zone, comprising—preparing a vapour stream comprising nitrogen oxide from ammonia, in an ammonia combustion zone;—bringing into contact by feeding to the ammonium destruction zone, individually and/or as pre-mixed combinations, at least part of said vapour stream, and a first liquid stream, comprising ammonium formed in the hydroxylamine phosphate oxime process, and a second liquid stream, comprising at least one acid selected from nitric acid and nitrous acid in a total nitric+nitrous acid concentration of at least 30 wt. %, thereby forming in the ammonium destruction zone a fluid mixture; and—reacting ammonium ions in the fluid mixture with nitrogen oxide under formation of molecular nitrogen, in the ammonium destruction zone. The invention further relates to an installation for converting ammonium formed in a hydroxylamine phosphate oxime process.

Claims11

Dependent claims

Process for converting ammonium ions formed in a hydroxylamine phosphate oxime process into molecular nitrogen in an ammonium destruction zone, comprising

—a—preparing a vapour stream comprising nitrogen oxide from ammonia, in an ammonia combustion zone;
—b—bringing into contact by feeding to the ammonium destruction zone, individually and/or as pre-mixed combinations,
(i) at least part of the vapour stream prepared in —a—, and
(ii) a first liquid stream comprising ammonium ions formed in the hydroxylamine phosphate oxime process, and
(iii) a second liquid stream comprising at least one acid selected from nitric acid and nitrous acid in a total nitric+nitrous acid concentration of at least 30 wt. %, thereby forming in the ammonium destruction zone a fluid mixture;
and
—c—reacting ammonium ions in the fluid mixture with nitrogen oxide under formation of molecular nitrogen, in the ammonium destruction zone.

4 more elements

Installation for converting ammonium from a hydroxylamine phosphate oxime installation (F) into molecular nitrogen, the installation comprising

an ammonia combustion zone (A) for converting ammonia into nitrogen oxide, comprising an inlet for a stream comprising ammonia (V1), an inlet for a stream comprising oxygen (V2), and an outlet (V3) for a vapour stream comprising nitrogen oxide, which outlet is connected to an inlet for vapour stream of an ammonium destruction zone (C) via a conduit for leading the vapour stream comprising nitrogen oxide into the ammonium destruction zone (C), the ammonium destruction zone (C) comprising an inlet (L-Acid) for co-feeding liquid nitric acid and/or nitrous acid into the installation, an inlet for a liquid stream comprising ammonium (L3) which inlet is connected to an outlet of a nitrogen oxide absorption zone (D), optionally an inlet (L6) for leading a liquid stream comprising ammonium originating from a hydroxylamine phosphate oxime process (F) into the ammonium destruction zone (C), an outlet (V5) for a vapour stream comprising nitrogen oxide which outlet is connected to an inlet of the nitrogen oxide absorption zone (D), and an outlet (L4) for a liquid stream which outlet is connected to an inlet of a bleaching zone (E);
the nitrogen oxide absorption zone (D) comprising an inlet (L2) for leading a liquid stream comprising ammonium originating from a oxime synthesis zone of a hydroxylamine phosphate oxime production zone (F) into the nitrogen oxide absorption zone (D), an inlet (V7) for leading a stream comprising oxygen into the nitrogen oxide absorption zone (D), and an outlet (V8) for off-gas;
the bleaching zone (E) comprising an inlet (V6) for a vapour stream comprising oxygen, an outlet for vapour stream (V7) comprising oxygen connected to the inlet for leading vapour stream comprising oxygen into the nitrogen oxide absorption zone (D), and an outlet for a liquid stream (L5) comprising process liquid and nitric acid (formed in zones C, D), which outlet is connected to an inlet for a hydroxyl ammonium salt synthesis zone of the hydroxylamine phosphate oxime process (F).

Dependencies are inferred from the claim text.

Destruction of ammonium ions

Life of this patent

Destruction of ammonium ions

Life of this patent

Abstract

Claims11