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

FIELD: industrial organic synthesis.

SUBSTANCE: hydroxylamine sulfate (caprolactam precursor) is prepared by mixing at excessive pressure in reaction zone nitrogen monoxide/hydrogen mixture, sulfuric acid/water mixture, and, as catalyst, platinum deposited on electrode graphite. Process is carried out such that foam-gas layer is formed in reaction zone. Over foam-gas layer formed is added further amounts of 18-25% sulfuric acid and mixture in reaction zone is subjected to additional turbulization.

EFFECT: more than thrice reduced NO content in emission gases and increased yield of hydroxylamine sulfate.

1 dwg, 1 tbl, 6 ex