Patent ID: 9580770
Date: 2017-02-28
CPC Classifications: B01J,C22B,Y02P

Claim:
1. A process comprising: a. adding a spent noble metal fixed-bed catalyst comprising one or more noble metals to a caustic solution to wash the spent noble metal fixed-bed catalyst and to make a wash slurry having a pH from 7 to 12.5, wherein the spent catalyst has been in contact with a chloroaluminate ionic liquid catalyst, and wherein the spent catalyst comprises from 5 to 35 wt % chloride; and b. filtering the wash slurry and collecting: i) a filter cake having from at least 70 wt % to 100 wt % of the chloride in the spent catalyst removed and having from 90 wt % to 100 wt % of the one or more noble metals retained, and ii) a wash filtrate.