Basf Aktiengesellschaft

Basf Akteingesellschaft

Steffen Kerth

Markus Weber

Eckhard Ströfer

Karl-Heinz Wostbrock

Joachim Thiel

Bernd Sachweh

Bernd Rumpf

Bernd Gerber

Heinz Krüger

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.

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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Ludwigshafen, Germany

Steffen Kerth