公开(公告)号：BR9811119A

公开(公告)日：2000-07-18

申请号：BR9811119

申请日：1998-08-04

Applicant: BASF AG

Inventor： WATZENBERGER OTTO ,  MAUER PETER ,  FER ECKHARD STR ,  SCHELLING HEINER ,  SCHNEIDER HANS-MICHAEL

IPC: C01B21/14

Abstract: An aqueous solution of free hydroxylamine is prepared by treating a hydroxylammonium salt with ammonia by the countercurrent method in a stripping column by a process in which hydroxylamine is liberated and at the same time the solution obtained is separated by distillation into an aqueous hydroxylamine solution and a salt fraction. The novel process can be carried out in a simple and gentle manner and on a large scale. The danger of decomposition is minimized owing to the low thermal load, the low concentration of hydroxylamine and the short residence time in the process.

公开(公告)号：BR0210492A

公开(公告)日：2004-06-22

申请号：BR0210492

申请日：2002-07-02

Applicant: BASF AG

Inventor： WOSTBROCK KARL-HEINZ ,  THIEL JOACHIM ,  GER HEINZ KR ,  FER ECKHARD STR ,  WEBER MARKUS ,  GERBER BERND ,  RUMPF BERND ,  SACHWEH BERND ,  KERTH STEFFEN

IPC: B01D3/16 ,  B01J19/30 ,  B01J19/32 ,  C01B21/14

Abstract: A process for preparing a salt-free aqueous hydroxylamine solution by distilling an aqueous solution of a hydroxylammonium salt and a base in a tray column having at least two mechanical trays, wherein random or structured packings are located above at least one tray of the tray column over the cross section of the column.

公开(公告)号：BR9810181A

公开(公告)日：2000-08-08

申请号：BR9810181

申请日：1998-06-18

Applicant: BASF AG

Inventor： WATZENBERGER OTTO ,  PFAB PETER ,  FER ECKHARD STR

IPC: B01D3/00 ,  C01B21/14

Abstract: PCT No. PCT/EP98/03714 Sec. 371 Date Dec. 8, 1999 Sec. 102(e) Date Dec. 8, 1999 PCT Filed Jun. 18, 1998 PCT Pub. No. WO98/57886 PCT Pub. Date Dec. 23, 1998A very pure aqueous solution of free hydroxylamine is prepared by a process in which the dilute, aqueous hydroxylamine solution is concentrated in a column by removing hydroxylamine-containing vapors via a side take-off in the bottom of the column, and very pure hydroxylamine is obtained by condensing the vapors. The novel process can be carried out simply, in a gentle manner and on a large scale and gives electronic grade hydroxylamine.