US 12,116,295 B2
Catalytic oxidation system and process for selective cyanide removal
Philip A. Burclaff, Weston, WI (US); Bryan J. Kumfer, Ringle, WI (US); and Duane R. Smith, Edgar, WI (US)
Assigned to LUMMUS TECHNOLOGY LLC, Houston, TX (US)
Appl. No. 17/269,852
Filed by LUMMUS TECHNOLOGY LLC, Houston, TX (US)
PCT Filed Aug. 9, 2019, PCT No. PCT/US2019/045826
§ 371(c)(1), (2) Date Feb. 19, 2021,
PCT Pub. No. WO2020/041007, PCT Pub. Date Feb. 27, 2020.
Claims priority of provisional application 62/721,980, filed on Aug. 23, 2018.
Prior Publication US 2021/0253458 A1, Aug. 19, 2021
Int. Cl. C02F 1/76 (2023.01); C02F 1/72 (2023.01); B01J 23/755 (2006.01); C02F 101/18 (2006.01)
CPC C02F 1/725 (2013.01) [C02F 1/722 (2013.01); C02F 1/76 (2013.01); B01J 23/755 (2013.01); C02F 2101/18 (2013.01); C02F 2209/06 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A process for selective removal of cyanide from a wastewater (12) comprising both cyanide and chemical oxygen demand (COD), the process comprising:
contacting the wastewater (12) with an amount of an oxidant (16) in the presence of a nickel-based oxide catalyst (18) to selectively remove an amount of the cyanide from the wastewater (12) in a vessel (14); and
maintaining a pH of 8 or more during the contacting of the wastewater (12) with the oxidant (16) and the nickel-based oxide catalyst (18),
wherein maintaining the pH is done via the addition of a caustic (26) to the vessel (14),
wherein pH sensors are associated with the vessel (14) to monitor the pH within the vessel (14), and
wherein a controller (30) is in electrical communication with the pH sensors and is in electrical communication with a source (28) of the caustic (26) for controlling an amount of the caustic delivered to the vessel (14).