Process for recovery of rhodium values

Details Process for recovery of rhodium values Process for recovery of rhodium values

1982-05-24

1982-12-21

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Platinum group metal

252412, 252414, 260546, 260549, C01G 5500

Patent

active

043649076

ABSTRACT:
Disclosed is a process for the recovery of residual rhodium from tar obtained by submitting a rhodium-containing catalyst-tar solution to an extraction using methyl iodide and aqueous hydrogen iodide, thereby recovering catalyst values in the aqueous phase and tar containing residual rhodium in the methyl iodide phase. The residual rhodium-containing tar is submitted to an extraction using a water-immiscible, inert solvent for the tar and aqueous ammonia to obtain residual rhodium in the aqueous phase. The catalyst-tar solution employed is derived from a production system in which acetic anhydride is prepared by carbonylating methyl acetate in the presence of rhodium, lithium and methyl iodide.

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