HYDROXYLAMINE SULFATE PRODUCTION PROCESS Russian patent published in 2006 - IPC C01B21/14 

FIELD: industrial organic synthesis.

SUBSTANCE: hydroxylamine sulfate (starting material in production of caprolactam) production process comprises: preparing reaction mixture of ammonia, oxygen, and water steam; catalytically oxidizing ammonia at pressure above 0.3 MPa; stabilizing composition of nitrose gas via hydrogenation of silver-manganese catalyst; concentrating nitrose gas by means of water steam condensation; combining concentrated nitrose gas with hydrogen and mixture of sulfuric acid, distillate produced in nitric acid condensate concentration, a part of secondary steam condensate produced during concentration of hydroxylamine sulfate, and catalysate remaining after catalytic hydrogenation of nitric acid contained in concentrated nitric acid condensate; catalytically hydrogenating nitric acid; and synthesis of hydroxylamine sulfate. Invention is characterized by that, (i) for concentration of nitric acid condensate to weight percentage of nitric acid 8%, heat of water steam condensation proceeding during concentration of nitrose gas is used; and (ii) hydroxylamine sulfate solution is concentrated to weight percentage 38% using heat of condensation of distillate vapors produced during concentration of nitric acid condensate in distillation column.

EFFECT: reduced power consumption at the same specific intake of raw materials.

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