Synthesis process of cobalt acetate

Abstract

The invention relates to a synthesis process of cobalt acetate, which belongs to the technical field of catalyst synthesis, and comprises the following steps: reducing cobalt carbonate powder in a hydrogen atmosphere at the reduction temperature of 480-500 DEG C for 2 hours to obtain cobalt powder; the method comprises the following steps: adding acetic acid and 50% water into a reaction kettle, then adding cobalt powder in three batches, then adding hydrogen peroxide and residual water, controlling the reaction temperature to be 60-90 DEG C and the pressure to be 0.3-0.4 MPa, staying for 3-6 minutes, filtering to obtain a cobalt acetate aqueous solution, and carrying out evaporation concentration, cooling crystallization and sieving to obtain cobalt acetate. Cobalt acetate is prepared by directly reacting metal cobalt with acetic acid and hydrogen peroxide; the metal cobalt contact reaction is slow, the mass transfer speed is slow, and the side reaction is aggravated, through the prepared cobalt powder, the reaction contact efficiency is improved, acetic acid is added firstly and then an oxidizing agent is added, the utilization rate of hydrogen peroxide is improved, and raw material consumption is reduced.

Description

technical field [0001] The invention belongs to the technical field of catalyst synthesis, and in particular relates to a synthesis process of cobalt acetate. Background technique [0002] Cobalt acetate is the most important catalyst for the preparation of terephthalic acid by liquid-phase oxidation of p-xylene. The process used in the early stage of the synthesis of cobalt acetate is generally produced by the nitric acid method to obtain cobalt acetate crystals. When used, it is dissolved. A lot of equipment is required, the process is long, the equipment is severely corroded, there is environmental pollution, the consumption of cobalt in the production is large, and the production cost is high. Then the nitric acid method was improved, that is, nitric acid acetic acid mixed acid was used to react with metal cobalt, and crystal cobalt acetate was produced through concentrated crystallization and impurity removal, but there were still many defects in this process, such as e...

AI Technical Summary

Problems solved by technology

[0002] Cobalt acetate is the most important catalyst for the preparation of terephthalic acid by liquid-phase oxidation of p-xylene. The process used in the early stage of the synthesis of cobalt acetate is generally produced by the nitric acid method to obtain cobalt acetate crystals. When used, it is dissolved. A lot of equipment is required, the process is long, the equipment is severely corroded, there is environmental pollution, the consumption of cobalt in the production is large, and the production cost is high

Then the nitric acid method was improved, that is, nitric acid acetic acid mixed acid was used to react with metal cobalt, and crystal cobalt acetate was produced through concentrated crystallization and impurity removal, but there were still many defects in this process, such as environmental pollution, low reaction efficiency, large consumption of raw materials and energy, In the later stage of the reaction, the cobalt activity decreases, and the impurity content in the product is high, etc.