Method for preparing potassium tetracyanoplatinate (II) trihydrate by pressure cyanidation
A technology of potassium acid trihydrate and tetracyanoplatinum, which is applied in the field of inorganic compound synthesis, can solve the problems of difficult control of reaction conditions, high production cost, and low total yield, and achieve easy control of reaction conditions and low total yield. Improvement, the effect that the response is sufficient
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Embodiment 1
[0023] Add the prepared 10wt% ascorbic acid solution dropwise to 200mL 25.62mmol / L H 2 PtCl 6 In the solution, the color of the solution changes from deep to light, from dark yellow to stable light yellow, at this time H 2 PtCl 6 The solution is converted to H 2 PtCl 4 solution. Then take 0.6g KOH and dissolve it in distilled water to make a 5wt% KOH solution, and add the KOH solution dropwise to the above H 2 PtCl 4 In the solution, the solution appeared precipitated. After the dropwise addition, continue to stir for 5 minutes to make the precipitation complete. Then weigh 1.7g KCN and add it to the above suspension. Dilute the suspension to 400 mL with distilled water and pour it into a 3-liter high-pressure reactor. , tighten the lid of the kettle, let in air, control the pressure at 2.0 MPa, raise the temperature to 110°C, keep the stirring speed at 400 r / min, cyanide at constant temperature and pressure for 2 hours, let the kettle body cool naturally for 1 hour, and...
Embodiment 2
[0025] Except that the following content is different from Example 1, all the others are the same.
[0026] h 2 PtCl 6 The concentration of the solution is 41.0mmol / L, the volume is 200mL, the amount of KOH is 1.0g, and it is made into a 5 wt% solution. The addition of KCN is 1.7g, and the suspension is diluted to 400mL with distilled water to finally obtain 7.90 mmolK 2 Pt(CN) 4 ·3H 2 O product, total recovery 96.3%, product element analysis result is shown in Table 1, does not detect the compound other than tetracyanoplatinate (II) potassium trihydrate.
Embodiment 3
[0028] Except that the following content is different from Example 1, all the others are the same.
[0029] h 2 PtCl 6 The concentration of the solution is 51.26mmol / L, the volume is 200mL, the amount of KOH is 1.2g, and it is made into a 5wt% solution. The addition of KCN is 1.7g, and the suspension is diluted to 400mL with distilled water to finally obtain 9.95mmolK 2 Pt(CN) 4 ·3H 2 O product, total yield 97.1%, product element analysis result is shown in Table 1, does not detect the compound other than tetracyanoplatinate (II) potassium trihydrate.
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