公开(公告)号：PL203409A1

公开(公告)日：1978-09-25

申请号：PL20340977

申请日：1977-12-27

Applicant: STAMICARBON

Inventor： HAASEN NICOLAAS F ,  VAN DE MOESDIJK CORNELIS G M ,  WAGEMANS GERARDUS M C

IPC: C01B21/14 ,  C07C ,  C01B

Abstract: An improved process is described for the reduction of ammonium ions, while avoiding any increase in nitrate ion concentration, in a liquid stream recycled between a zone of synthesis of hydroxyl ammonium salt and a zone for synthesis of oxime, wherein the liquid stream is contacted with a gas stream consisting essentially of nitrogen monoxide and containing nitrogen dioxide at a pressure above 1 atmosphere, at a temperature of at least 80 DEG C., such that after the contact the molar NO2/NO ratio of the gas stream is within the range of between about 10-1 to 10-4:1.