Process for automatically controllable reduction of the nitrite

Details Process for automatically controllable reduction of the nitrite Process for automatically controllable reduction of the nitrite

1992-08-07

1994-04-26

McCarthy, Neil

Liquid purification or separation

Processes

Including controlling process in response to a sensed condition

210759, C02F 172

Patent

active

053064313

ABSTRACT:
Reduction of the nitrite content of aqueous solutions by treatment with hydrogen peroxide in the acidic pH range can be controlled by measurement of the redox potential. Contrary to the teaching of the prior art, addition of the hydrogen peroxide in the process according to the invention is terminated not at the highest redox potential, but only after lowering of the potential to a value of 650.+-.10 mV. In this way, nitrite contents below 1 mg/l can be obtained even when the solutions additionally contain fluctuating amounts of various compounds oxidizable by H.sub.2 O.sub.2.

REFERENCES:
patent: 4268397 (1981-05-01), Horie et al.
patent: 4416786 (1983-11-01), Knorre et al.
patent: 4968436 (1990-11-01), Gutekunst et al.
World Patents Index Latest, Week 8125, Derwent Publications Ltd., Class A, AN 81-45424 and SU 767,147.

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