This is a detailed introduction of the preparation of activated alumina for hydrogen peroxide preparation process. α-AlOH3 is dried and then crushed to obtain α-AlOH3 micro powder; high-temperature hot air is mixed with α-AlOH3 micro powder in a downstream flow, and enters a tubular reactor to carry out rapid dewatering, and then solid-gas separation is carried out, and the powder is collected, then to be mixed with water, and molding additives are also added, and then extruded into flake-like particles; the flake-like particles are oxidized at 40-80°C and 90-95% humidity for 48 hours, to obtain the proposed thin hydrotalcite crystalline activated alumina; and the proposed thin hydrotalcite crystalline activated alumina is roasted, to obtain the activated alumina used in the preparation process of hydrogen peroxide.

The activated alumina obtained by this method is highly active, can greatly reduce anthraquinone loss when applied to hydrogen peroxide process, and has strong regeneration ability for anthraquinone degradation products.

The use of activated alumina for hydrogen peroxide tips to control the drying tower K2CO3 solution concentration between 1.3g/L-1.4g/L, which requires to control the concentration of alkali and alkali evaporation when we match alkali or evaporation. Activated alumina for hydrogen peroxide on the long-term use of dilute alkali solution should be replaced in time in order to reduce the phosphate content of K2CO3 solution to reduce the consumption of activated alumina; normal production of the drying tower temperature control at 40 a 55 ° C, in the production of the post-treatment process of the working fluid is the lowest point of the temperature of the process, the regeneration temperature of the white clay bed is usually only 40 ° C. The temperature of the drying tower should be controlled at 40 ° C, especially at the beginning of each drive. Especially at the beginning of each production, the drying tower temperature is low, in order to prevent alkali, we need to advance in the working fluid circulation process of the working fluid preheating, and gradually raise the temperature of the drying tower, especially in winter. In addition, the regeneration of the working fluid in the activated alumina, the temperature rises, the regeneration effect is obvious; control the operation of the extraction process, in particular, to control the H2O2 content in the extraction residual liquid. Make it less than 0.3g / L, so as to reduce the burden of the drying tower, so that the working fluid in the drying tower after the phenomenon caused by the band reduction is greatly reduced. At the same time, reduce the amount of H2O2 into the white earth bed; hydrogen peroxide with activated alumina according to the requirements of good control of the drying tower interface in 1/3-2/3, stable operation to prevent fluctuations in the drying tower interface, in order to prevent alkali; strict control of the many factors affecting the hydrogenation, oxidation process of the chemical reaction, try to reduce the generation of degradation of substances to reduce the burden of white earth bed activated alumina regeneration, to prolong the activated alumina period of time; strictly put the Activated alumina feed off, the requirement of activated alumina in water, K2CO3 solution and working fluid in a long period of immersion does not soften, not crushed, which is the premise of it to play a normal role.

If the strength is not enough or after soaking pulverization, dust to other processes, will have adverse consequences, can cause hydrogenation catalyst activity decline, oxidation yield reduction, extraction tower liquid flooding and other accidents, a serious threat to production safety.