Method for selectively removing iron ions in cobalt manganese acetate catalyst system

By controlling the pH value in steps and using hydrogen peroxide oxidation, the problem of removing iron ions in the cobalt manganese acetate catalyst was solved, and the efficient recovery and resource utilization of the cobalt manganese catalyst was achieved, reducing costs and environmental pollution.

CN120679613APending Publication Date: 2025-09-23浙江独山能源有限公司
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Patent Information

Application Number
CN202510837688.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2025-03-14
Filing Date
2025-06-23
Publication Date
2025-09-23

AI Technical Summary

Technical Problem

In the existing technology, in the PTA production process, it is difficult to selectively remove iron ions in the cobalt manganese acetate catalyst system, resulting in a high loss rate of the cobalt manganese catalyst, increased acetic acid consumption, and the risk of environmental pollution.

Method used

A step-by-step method is adopted, including mother liquor concentration, initial dissolution, redissolution, solid-liquid separation, oxidative decomplexation and selective precipitation. Sodium carbonate solution and oxalic acid are used to control the precipitation process of cobalt, manganese and iron at different pH values. Hydrogen peroxide is combined to oxidize iron ions, and iron ions are removed by selective precipitation with oxalic acid.

Benefits of technology

The efficient recovery of cobalt-manganese catalyst was achieved, the cobalt-manganese loss rate was reduced to below 1%, the acetic acid consumption was reduced, the process stability and environmental protection were improved, and the by-product iron oxalate could be recycled, reducing costs and carbon emissions.

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Abstract

The invention relates to the technical field of catalyst recycling, in particular to a method for selectively removing iron ions in a cobalt-manganese acetate catalyst system, which comprises the following specific steps: mother liquor concentration, primary dissolution, redissolution, separation of organic liquid and cobalt-manganese carbonate, iron-cobalt complex separation, oxidation decomplexing, selective precipitation, solid-liquid separation and acidity recovery. Finally, cobalt acetate and manganese catalysts are obtained and sent to a catalyst collecting tank to be recycled by a process device, and separated ferric oxalate serves as a by-product. According to the method, the generated iron-cobalt complex is reduced by optimizing control conditions in the catalyst recovery process, after the produced iron-cobalt complex is decomplexed, Fe < 3 + > and oxalate ions in the precipitation stock solution are subjected to a complexation reaction to generate an iron oxalate coordination compound precipitate, so that the purpose of removing oxalic acid in the precipitation stock solution is achieved, and the recovery rate of the catalyst is improved. Furthermore, pure cobalt acetate and manganese acetate solutions are recovered, and the recovered catalyst can be directly reused in the original production of a process device.
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