Process for the manufacture of nitric oxide

摘要

A process for the production of nitric oxide comprising contacting aqueous nitric acid solution with gaseous sulphur dioxide in a gas-liquid contact zone thereby producing a product gas comprising nitric oxide, wherein the nitric acid and sulphur dioxide are introduced into the contact zone at a nitric acid to sulphur dioxide molar ratio of at least 0.7:1, thereby producing a nitrous oxide- and nitrogen-depleted nitric oxide product gas.