Process for reclaiming Pd from waste Pd-C catalyst

Abstract

The invention provides a recovery method for palladium from lapsed Pd-C catalyst. With alkali or alkaline earth carbonate as an additive, in 700 to 800 Deg. C, oxygenizing and burning the lapsed Pd-C, refined residue reacting with alkali bisulfate and generating soluble palladium salt, then separating palladium by electrolysis, the single-pass recovery ratio can achieve more than 94 percent, and the purity is 99.95 percent.

Description

[0001] Involved areas [0002] The invention is a method for recovering palladium economically and efficiently from waste palladium catalysts, more precisely from spent waste Pd-C catalysts. Background technique [0003] Palladium catalysts are widely used in the field of chemical production. The commonly used Pd-C hydrogenation reaction catalyst can turn unsaturated alkenes and alkynes into saturated alkanes; turn unsaturated alcohols, aldehydes, ketones, and acids into saturated organic compounds ; Make the liquid oil become solid after hydrogenation. Palladium catalysts have the characteristics of high activity and good selectivity, but in actual production, the use of palladium catalysts also greatly increases the production cost of products. Therefore, whether palladium in spent catalysts can be recovered economically and efficiently depends on the It is extremely important in industry. [0004] Waste Pd-C catalyst is usually a solid slag-like substance with high carbon...

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Problems solved by technology

[0009] The above several methods can reclaim most of the palladium in the spent Pd-C catalyst, but the existing problems are also obvious, such as some complex processes, some low palladium yields, and some have environmental protection problems, etc.

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