Basf Aktiengesellschaft

Basf Akteingesellschaft

Karl-Heinz Wostbrock

Markus Weber

Eckhard Ströfer

Steffen Kerth

Joachim Thiel

Bernd Sachweh

Bernd Rumpf

Bernd Gerber

Heinz Krüger

Gerd Kaibel

Christian Tragut

Gabriele Anken

A process for preparing a salt-free aqueous hydroxylamine solution by reacting an aqueous solution of a hydroxylammonium salt with a base to give a mixture and separating from said mixture by distillation a salt-free aqueous hydroxylamine solution, involving using as a base an aqueous solution of a mixture of NaOH and KOH in a molar ratio Na:Kin the range from 70:30 to 95:5 and with a total concentration of Naand Kin the range from 0.1 to 10 m/m % based on the total amount of the mixture.

Method for producing an aqueous hydroxylamine solution devoid of salt

The invention relates to a method for producing a highly pure, aqueous hydroxylamine solution by distilling an aqueous solution, devoid of salt, of a hydroxyl ammonium salt in a plate column comprising at least two mechanical plates. Said method is characterised in that packing bodies are arranged between at least two plates of the plate column over the cross-section of said column.

Crude ammonia is separated into a low boiler fraction, a high boiler fraction and an intermediate-boiling pure fraction by continuous fractional distillation in a distillation apparatus configured either as a dividing wall column or as a system of thermally coupled distillation columns. In the process of the present invention, the low boiler fraction is taken off at the top of the distillation apparatus. The intermediate-boiling pure fraction is obtained at a side offtake which is preferably provided with droplet precipitators. In addition, the gas loading of the distillation column is restricted so that the operating pressure is in the range from 2 to 30 bar and the F factor does not exceed 2.0 Pa.

Purification of ammonia by distillation

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.

Method for the production of a salt-free aqueous hydroxylamine solution

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Mörstadt, Germany

Karl-Heinz Wostbrock