Phosphoric Acid → HCID 178514467, compound

One hundred eighty-eight (188) grams of Dowex 2-X8 (total exchange capacity 563 mequiv., an ion exchange resin available commercially from Dow Chemical Company) were slurried in water and transferred to a 250 ml buret. The ion exchange resin was washed with a 5% NaOH solution in the conventional fashion to ensure the resin being in the basic form. The resin was subsequently washed with deionized water until the eluate was neutral to pH paper. A solution of 16.7 grams triaminoguanidinium nitrate in 600 ml of deionized water was prepared. This solution was passed through the column containing the ion-exchange resin. When the pH of the eluate became basic, the solution of triaminoguanidinium hydroxide was added to a flask containing 7.0 ml of 85% phosphoric acid diluted with 10 ml of deionized water. After all of the aqueous solution of triaminoguanidine nitrate had been added to the ion-exchange column, the column was washed with deionized water until the effluent was neutral to pH paper, and these washings were also added to the phosphoric acid solution.

1. washThe ion exchange resin was washed with a 5% NaOH solution in the conventional fashion
2. washThe resin was subsequently washed with deionized water until the eluate
3. additioncontaining the ion-exchange resin
4. washthe column was washed with deionized water until the
5. additionthese washings were also added to the phosphoric acid solution

ORD record

ord-e7a7f6efd614490e8272d9f5d790687e

Source dataset

uspto-grants-1984_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04472214