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Using the procedure of P. Baumgarten, Ber., 6913, 2929-2937 (1936), diammonium imidodisulfate was prepared by adding 114 grams (1.0 mol) of ammonium sulfamate to 97 grams (1.0 mole) of sulfamic acid in a one liter beaker. The mixture was heated on a hot plate with constant mixing. At about 130° C. a stirrable slurry was obtained, and at about 155° C. an exothermic reaction began, forming a solid. When the solid cooled, it was dissolved in about 375 grams of 45 percent potassium hydroxide. Water was added to bring the total volume to 800 milliliters. The resulting solution was filtered and then heated under vacuum to expel ammonia. The solution was cooled and concentrated hydrochloric acid was carefully added to adjust the mixture to pH 7.5. The resulting precipitate was filtered yielding about 150 grams of dipotassium imidodisulfate.

1. temperatureThe mixture was heated on a hot plate with constant mixing
2. customAt about 130° C. a stirrable slurry was obtained
3. customat about 155° C. an exothermic reaction
4. customforming a solid
5. temperatureWhen the solid cooled
6. filtrationThe resulting solution was filtered
7. temperatureheated under vacuum
8. temperatureThe solution was cooled
9. additionconcentrated hydrochloric acid was carefully added
10. filtrationThe resulting precipitate was filtered