“This is the first chemical process safety and reliability demonstration used in China, which marks a big step forward in the localization of my country’s fluidized bed hydrogen peroxide process.” Zhao Xiaodong, head of hydrogen peroxide technology at Liming Institute, said.

According to Zhao Xiaodong, compared with the fixed bed process, the fluidized bed hydrogenation process has the advantages of uniform gas-liquid-solid three-phase mixing, high mass transfer efficiency, and low consumption of anthraquinone. Large-scale industrial plant production.

Industry experts believe that the fluidized bed hydrogen peroxide process and key raw materials with domestic independent intellectual property rights developed by Liming Institute, especially the preparation process of powder palladium catalyst, are of great significance to promoting the technological progress of the hydrogen peroxide industry.

During the research and development process, after more than 30 years, Liming Institute has completed the small test, the pilot test and the expansion test, and finally developed the fluidized bed hydrogen peroxide process, and localized all the key raw materials. Powder palladium catalyst is the difficulty in the research and development of the whole process. To this end, the R&D team used the double-aluminum method to prepare pseudo-boehmite. After spray molding, a micro-spherical alumina carrier with the advantages of specific surface area, large pore volume, large pore size and narrow distribution range was obtained, and then the impregnation method was used to load it. Precious metal palladium, to prepare high activity and high selectivity powder palladium catalyst.

Zhao Xiaodong said that the technology uses a new high-efficiency working fluid system composed of 2-amyl anthraquinone and diisobutyl methanol, which increases the hydrogenation efficiency to more than 15 grams per liter. Under the same scale, the initial investment of raw materials such as catalyst and working fluid can be saved by 25%, and the operating cost of the device can be reduced by about 10%. At the same time, this process has the advantages of simple process, high degree of automation and high equipment production efficiency, and is especially suitable for supporting propylene oxide (PO) units of 300,000 tons/year and above, while the fixed bed process generally builds two sets of 400,000 tons/year The annual hydrogen peroxide device is matched with it. According to testing, the performance indicators of the products made by this process are better than those of imported products.

At present, Liming Institute has prepared a complete process package for fluidized bed hydrogen peroxide, and has large-scale production capacity such as powder alumina palladium catalyst for fluidized bed hydrogenation, 2-amyl anthraquinone, and diisobutyl methanol. It has applied for 18 related patents in key areas such as bed reactors, filtration equipment, working fluid systems, catalyst online addition and discharge regeneration, and process logic control. After that, the process will be used in the self-built plant of Liming Institute as a demonstration project of the fluidized bed hydrogen peroxide process.

“In the next step, the newly built hydrogen peroxide unit of Liming Institute will develop in the direction of large-scale, high-efficiency and automation. The progress of my country’s fluidized bed hydrogen peroxide production technology can meet the requirements of the chemical synthesis of caprolactam and propylene oxide. The demand for the quality and output of hydrogen oxide will boost the development of the national nylon and polyurethane new material industry, drive the transformation and upgrading of the coal chemical and petrochemical industries, and the development of mid- and downstream industrial clusters.” Zhao Xiaodong said.