Method for adsorbing palladium falling off in glucose oxidation process by active carbon

Abstract

The invention relates to a method for adsorbing palladium falling off in the glucose oxidation process by active carbon, which can effectively solve the recovery problem of the palladium falling off in the glucose oxidation process. In order to solve the problem, the method has the technical scheme that the active carbon is placed in a container, oxidation liquid generated in the gluconic acid sodium salt production process is added, the active carbon and the oxidation liquid are uniformly stirred, the still standing is carried out at the room temperature, the materials are filtered, filter liquid is recovered, the filtered active carbon is returned to the container, the operations are repeated for many times in such a way until the palladium falling off in the glucose oxidation process is adsorbed on the surface of the active carbon, the goal of recovering the palladium is realized, or the active carbon is directly used as a palladium catalyst of a carrier. The method is simple and is easy to operate, the recovering effect is good, and the method belongs to great innovation on the recovery of the palladium falling off in the glucose oxidation process.

Description

technical field [0001] The invention relates to chemical industry, in particular to a method for adsorbing palladium that falls off during the oxidation of glucose with activated carbon. Background technique [0002] When using the multi-metal catalyst to catalyze the oxidation of glucose, the activated carbon particles are broken due to the repeated circulation of the spray method, resulting in the palladium crystal particles falling off. According to statistics, the palladium that falls off accounts for about 35% of the palladium in the catalyst, that is to say, the catalyst contains 1000g of palladium, and only 650g of palladium is finally recovered, and 350g of palladium falls off. According to the current market price of 180 yuan / g, it will lose 63,000 yuan. Yuan. Therefore, how to recover the lost palladium is worth studying. [0003] To recover the palladium lost during glucose oxidation, it is necessary to understand the process of glucose oxidation. In the proces...

AI Technical Summary

Problems solved by technology

The oxidation solution and the catalyst are circulated back and forth through the pump for many times. During this process, the activated carbon is broken and the palladium falls off. This method of removing palladium is called physical removal of palladium, which means that palladium exists in the form of metal in the glucose oxidation solution. Therefore, there are two ways to reclaim palladium. The one is to take recovery by filtration, and the other is to add some substance to absorb the palladium in the oxidation solution. However, according to relevant literature reports, the particle diameter of microcrystalline palladium in activated carbon is 2.5nm. Interception can only be carried out by nanofiltration, plus each batch of oxidized material has a total volume of about 3600L, so nanofiltration will be difficult

Therefore, it is difficult to popularize and apply, so it is imperative to develop new recycling methods