Process for preparing rhodium nitrate solution

Details Process for preparing rhodium nitrate solution Process for preparing rhodium nitrate solution

1988-07-07

1989-07-04

Doll, John

Chemistry of inorganic compounds

Nitrogen or compound thereof

Oxygen containing

423544, 423592, C01F 1114, C01G 5500

Patent

active

048448796

ABSTRACT:
A process of the present invention comprises dissolving rhodium black in sulfuric acid under heating, making the pH of the said sulfuric acid solution neutral or basic by adding an alkaline solution to the said sulfuric acid solution to precipitate rhodium as rhodium hydroxide, separating the rhodium hydroxide and dissolving it in nitric acid.
The process is useful for preparing the rhodium nitrate solution which is not decomposed by heating or concentration to produce turbidity, and produces almost no changes when it is allowed to stand at room temperature for a long period of time. Since the rhodium nitrate solution has the excellent heat-stability and endurance for long term storage, the said solution can be employed as a useful rhodium source which does not decompose for a variety of applications.

REFERENCES:
patent: 1135785 (1915-04-01), Frasch
patent: 3425801 (1969-02-01), Stowe

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