Method for manufacturing hydroxylamine
AssigneeChina Petrochemical Development Corporation
InventorsShu-Hung Yang, Cheng-Fa Hsieh, Yi-Bau Hung
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Abstract
Provided is a method for manufacturing hydroxylamine. In this method, an aqueous reaction medium containing acidic buffer agent and nitrate ions in the presence of a limited amount of metal impurities such as Fe or Cu is introduced into a hydroxylamine synthesis reactor in the presence of catalyst to proceed hydroxylamine synthesis by reduction of nitrate ions with hydrogen gas as reducing agent in the aqueous reaction medium to produce hydroxylamine. The reaction is processed in the aqueous reaction medium with a limited amount of metal impurities or even without metal impurities, such that the selection rate of the hydroxylamine product is increased.
Claims8
A method for manufacturing hydroxylamine, comprising the steps of:
- pretreating an aqueous reaction medium taken from an oximation reaction of a hydroxylamine-oxime cycling process to reduce an amount of Cu metal in the aqueous reaction medium to less than 0.09 ppm, wherein the aqueous reaction medium comprises an acidic buffer agent, nitrate ions and metal impurities;
- introducing the aqueous reaction medium into a hydroxylamine synthesis reactor;
- and
- reducing the nitrate ions to the hydroxylamine in the presence of a catalyst in the reaction medium.
Dependencies are inferred from the claim text.