Patent ID: 8580212

Claim:
A process for preparing a trichloroammineplatinate salt of the structural formula M[PtCl 3 (NH 3 )]·n H 2 O, wherein n is from 0 to 1 and M is a cation, comprising the following steps: a) reacting a first aqueous solution, which comprises 1 to 10 weight % of a tetrachloroplatinate salt, in the presence of an 1- to 5-fold stoichiometric amount of ammonium chloride and an 1- to 10-fold stoichiometric amount of an alkali chloride with an 1- to 1.5-fold stoichiometric amount of one or more carbonate salts selected from the group consisting of potassium, sodium and ammonium carbonate while keeping the pH value below 7 during the reaction so as to obtain a second solution, b) cooling the second solution to a temperature from 0 to 10° C. to obtain a suspension, c) removing a solid phase from the suspension obtained in step b) so as to obtain a third solution, d) applying the obtained third solution to an ion exchange stationary phase, e) eluting a fourth solution comprising trichloroammineplatinate acid from the stationary phase in step d) with hydrochloric acid and f) adding a chloride salt MCl to the fourth solution so as to obtain the trichloroammineplatinate salt solution.