Thiocyanic Acid → Ammonium thiocyanate

HRID 2351264

Reaktionsgleichung

Reaktionsgleichung von HRID 2351264
S([O-])([O-])(=O)=[O:2].[NH4+].[NH4+].S(=O)(=O)(O)[OH:9].[N:13]#[C:14][SH:15].[Hf:16].[S-]C#[N:19].[Hf+4].[S-]C#N.[S-]C#N.[S-]C#N>>[S-:15][C:14]#[N:13].[NH4+:19].[OH-:2].[Hf+4:16].[OH-:9].[OH-:2].[OH-:2]

Komponenten

7

Edukt 5

HCID 781Thiocyanic AcidHCID 1118Sulfuric AcidHCID 23986HafniumHCID 6097028Ammonium Sulfate2×HCID 14619944HCID 14619944, Verbindung

Produkt 2

HCID 15666Ammonium thiocyanateHCID 9881356Hafnium(4+) tetrahydroxide

Versuchsvorschrift

This process was allegedly further improved by stripping the loaded solvent with a saturated aqueous solution of ammonium sulfate containing some sulfuric acid, the extract phase containing thiocyanic acid, ammonium sulfate, and the hafnium values in the form of hafnium thiocyanate. Such extract phase is then treated with gaseous ammonia, which reacts with the thiocyanic acid and hafnium thiocyanate to simultaneously form ammonium thiocyanate and hafnium hydroxide. This is said to be of the utmost importance in coprecipitating ammonium sulfate with the hafnium hydroxide to make the hafnium hydroxide easily filterable, see the aforementioned Greenberg et al., U.S. Pat. No. 3,069,232 of Dec. 18, 1962 entitled "Recovery of Hafnium Values." However, not only is the sulfate ion present, but the sulfuric acid introduced into the ammonium sulfate extractant to ensure recovery of the major portion of the thiocyanic acid in the extract phase, contaminates the extract phase and requires additional purification steps.

Aufarbeitung

  1. extractionSuch extract phase
  2. additionis then treated with gaseous ammonia, which
  3. customreacts with the thiocyanic acid and hafnium thiocyanate

Quellen und Nachweise

ORD-Eintrag
ord-11d10964131845d5a33f8f27299eca0c
Quelldatensatz
uspto-grants-1989_10
Patentnummer
US04873072

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