Process and device for preparing hydroxylamine

Abstract

The invention relates to a continuous process for preparing hydroxylamine in a buffered aqueous phosphoric acid-containing solution by hydrogenating nitrate with hydrogen at a pressure above atmospheric pressure in the presence of suspended Pd-containing hydrogenation catalyst particles in a loop venturi reaction device comprising a hydrogenation reactor and an external circulation loop, wherein the hydrogenation reactor comprises a downward-directed gas-suspension ejector in the upper region of the hydrogenation reactor, comprising a reaction mixture inlet, a motive fluid nozzle, a suction chamber, a throat, a divergent outlet diffuser, and optionally, a convergent inlet nozzle, . The invention further relates to a loop venturi reaction device for continuously preparing hydroxylamine in a buffered aqueous phosphoric acid containing solution by hydrogenating nitrate with hydrogen at a pressure above atmospheric pressure in the presence of suspended Pd-containing hydrogenation catalyst particles and to the use of the loop venturi reaction device of the invention as stand-alone unit for the production of hydroxylamine or as a part of a chemical plant for the production of oximes, preferably as part of a chemical plant for the production of oximes, more preferably as part of a chemical plant for the production of butanone oxime, cyclopentanone oxime, cyclohexanone oxime and / or cyclodedocecanone oxime, most preferably as part of a chemical plant for the production of cyclohexanone oxime.

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