Oxalic Acid → 867-64-1

HRID 1903703Notes

Reaction equation

HRID 1903703 reaction equation
[C:1]([OH:6])(=[O:5])[C:2]([OH:4])=[O:3].[Gd:7]>[Ga]>[C:1]([O-:6])(=[O:5])[C:2]([O-:4])=[O:3].[Gd+3:7].[C:1]([O-:6])(=[O:5])[C:2]([O-:4])=[O:3].[C:1]([O-:6])(=[O:5])[C:2]([O-:4])=[O:3].[Gd+3:7]

Participants

4

Reactant 2

HCID 971Oxalic AcidHCID 23982Gadolinium

Product 1

HCID 150859867-64-1

Reagents, catalysts & solvents 1

HCID 5360835GalliumSolvent

Conditions

Temperature
80 °C

Procedure

After pretreatment and dissolution in mineral acid of the gadolinium and gallium by-products as described above, the filtrate is heated to 80° C. and solid oxalic acid is added to precipitate gadolinium oxalate, Gd2 (C2O4)3. The precipitate, which forms immediately, is separated from gallium and transition metal impurities by conventional methods, by either vacuum filtration or centrifugation. The cake of gadolinium oxalate, thus obtained, may be slurried in a water solution containing 2% by weight of oxalic acid to remove trace adhering gallium solution. The yield of gadolinium oxalate is of the order of >95%. Direct pyrolysis of this oxalate at 850°-950° C. results in its conversion to gadolinium oxide, Gd2O3, in >95% yield and >99.99% purity.

Workup

  1. customto precipitate gadolinium oxalate, Gd2 (C2O4)3
  2. customis separated from gallium and transition metal impurities by conventional methods, by either vacuum filtration or centrifugation

Sources & evidence

ORD record
ord-25660eefe6124d638d7c1763188e17fa
Source dataset
uspto-grants-1984_03
Patent number
US04438078

Reaction notes

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