Patent · US Expired

Preparation of aqueous solutions of free hydroxylamine

US4778669A · kind A · utility

18Cited by

2References

7Claims

0Family size

Assignee

BASF SE

Inventors

Hugo Fuchs · Ludwigshafen, DE
Franz-Josef Weiss · Schifferstadt, DE
Erwin Thomas · Freinsheim, DE
Josef Ritz · Ludwigshafen, DE

Key dates

Filing date	Jan 22, 1987
Grant date	Oct 18, 1988
Priority date	—
Expiry date	Jan 22, 2007

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC01B21/1445
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

Aqueous solutions of free hydroxylamine are prepared by a process in which PA0 (a) hydroxylammonium sulfate is reacted with ammonia in a lower alkanol as solvent, and a solution of free hydroxylamine and solid ammonium sulfate with residues of hydroxylammonium sulfate is obtained, PA0 (b) solid ammonium sulfate and hydroxylammonium sulfate are separated off from the resulting reaction mixture, and an alcoholic solution of free hydroxylamine is obtained as the filtrate, PA0 (c) a stabilizer and water are added to the resulting alcoholic solution of free hydroxylamine, and PA0 (d) the alkanol is distilled off from the alcoholic solution containing free hydroxylamine, the stabilizer and water.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.