公开(公告)号：KR860000515B1

公开(公告)日：1986-05-02

申请号：KR820001971

申请日：1982-05-06

Applicant: STAMICARBON

Inventor： RULKANS PETER F M ,  HAASEN NICOLAAS F ,  PLANTEMA OTTO G

IPC: B01D3/14 ,  C07D201/16

Abstract: The purifn. of epsilon-caprolactam (I), which is obtd. by the rearrangement of cyclohexanone oxine by H2SO4 or oleum and is used as an intermediate for Nylon, comprises a two-stage vacuum distn. The crude(I) is passed to the first column, which has an evaporator with a packed column with a pressure drop of less than 2.5 mbar per theoretical tray, and from which low b.p. impurities are removed as overheads. The bottom prods. are passed to the second column wherepure(I) is septd. as overhead and the high b.p. impurities as bottoms.

公开(公告)号：CA1182775A

公开(公告)日：1985-02-19

申请号：CA402546

申请日：1982-05-07

Applicant: STAMICARBON

Inventor： RULKENS PETER F M ,  HAASEN NICOLAAS F ,  PLANTEMA OTTO G

IPC: B01D3/14 ,  C07D201/16

Abstract: 1. Process for the purification of .epsilon.-caprolactam, obtained through rearrangement of cyclohexanone oxime by means of sulphuric acid or oleum, by subjecting the caprolactam to be purified to distillation under reduced pressure, with separation of low-boiling and high-boiling impurities. The distillation is carried out in two steps with at least in the 1st step an evaporator with a rectification column containing packing material with a pressure drop of less than 2.5 mbar per theoretical tray. The caprolactam to be purified is supplied to the rectification column of the 1st step, the low-boiling impurities are carried off from this column, the bottom product remaining in the 1st step is supplied to the 2nd step and in this step the high-boiling impurities are carried off as bottom product. The purified caprolactam is recovered as top product.

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.

公开(公告)号：CA1221365A

公开(公告)日：1987-05-05

申请号：CA461995

申请日：1984-08-29

Applicant: STAMICARBON

Inventor： PLANTEMA OTTO G ,  JETTEN ARNOLD G M ,  HAASEN NICOLAAS F

IPC: C07D201/16 ,  C07D223/10

Abstract: The invention relates to a process for recovering caprolactam from residue remaining after distillation, under reduced pressure, of impure caprolactam obtained from rearrangement of cyclohexanone oxime with sulphuric acid or oleum, comprising subjecting the residue to distillation under reduced pressure, hydrogenating the caprolactam-containing distillate so obtained in an aqueous medium and recovering caprolactam from the resulting hydrogenation product. The process provides a way of recovering the valuable caprolactam from the residue without need of any strong acid treatment and only requiring one distillation step.