Patent · US Expired

Preparation of hydroxylammonium salts

US5236685A · kind A · utility

5Cited by

5References

2Claims

0Family size

Assignee

BASF SE

Inventors

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

Key dates

Filing date	Jul 27, 1992
Grant date	Aug 17, 1993
Priority date	—
Expiry date	Jul 27, 2012

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB01J37/031
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A process for the preparation of hydroxylammonium salts by the reduction of nitrogen oxide (NO) with hydrogen in dilute aqueous mineral acid in the presence of a suspended platinum catalyst which is partially poisoned with arsenic, at elevated temperature, wherein the catalyst used is one which has been produced by precipitation of metallic platinum from an aqueous solution on to a suspended support in the presence of an oxidic arsenic compound, by means of a reducing agent.

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