METHOD AND APPARATUS FOR OBTAINING HYDROXILAMINE SULFATE Russian patent published in 1995 - IPC

FIELD: chemical industry. SUBSTANCE: method involves preparing reaction mixture of ammonia, oxygen and vapors in mixer; subjecting ammonia to vapor-oxygen oxidation by catalysis conducted in reactor; mixing nitrous gas with hydrogen in mixer and stalilizing its content in reactor; separating condensed nitric oxide in condenser (II); passing it through gas blower to provide removal of nitric oxide (IV) repeating cleaning process in absorbong column mixing in reactor with hydrogen; mixing sulfuric acid and water in reactor; subjecting hydroxilamine sulfate to synthesis in staged reactors. Nitric oxide is separated in two stages: at the first stage the prevailing portion of condensate with nitric acid content of up to 0.3% is separated. Circulating condensate is heated by condensation heat. At the second stage condensate with nitric acid content of 5-6% is separated and simultaneously desorption of nitric oxides from circulating liquid is effectuated. Condensate mentioned is subjected to recuperative rectification with separation of secondary vapors and 40-45%- nitric acid. Vapors of nitric acid are further hydrogenated when nitrous gas content is stabilized. Apparatus is further provided with recuperative condenser, vapor-oxygen mixture overheater, saturating and rectifying columns. Recuperative condenser is connected with saturating column and sulfuric acid and water mixer. Rectifying column is connected with nitrous gas-hydrogen mixer and vapor-oxygen mixture overheater, which is connected with ammonia, oxygen and vapor mixer. EFFECT: increased efficiency and improved quality of product. 3 cl, 2 dwg