Technical background

At present, the main processes for the production of hydrogen peroxide by anthraquinone method in China are: fixed bed process and slurry bed process, among which the fixed bed process has become the mainstream of domestic hydrogen peroxide production process due to its low investment, high yield, simple operation, low content of precious metals in palladium catalysts, high activity, easy regeneration and safety.

Recently, due to the expanding market demand for hydrogen peroxide, increased production capacity requirements, and significant increases in palladium metal prices, the production process of palladium catalysts has been continuously improved and optimized. On the basis of the first generation of traditional catalysts, the second generation of high-efficiency palladium catalysts has been derived, which has the advantages of less loading, higher production capacity, and lower maintenance and regeneration costs.

Since 2002, Shaanxi Kaida has entered the production field of palladium catalysts for fixed bed hydrogen peroxide for the first time, developing from traditional palladium catalysts to the current research and development and production of high-efficiency palladium catalysts. It has long been committed to improving the surface physicochemical properties of palladium catalyst supports for hydrogen peroxide, as well as optimizing and perfecting the catalyst preparation process. This has greatly improved the hydrogenation activity of the catalyst while ensuring high selectivity, and greatly extended the regeneration cycle and service life of the catalyst.

Technical parameter description

Traditional palladium catalyst index: capacity ≥3 kgH2O2 (100%)/kgCat.d

High efficiency palladium catalyst index: capacity ≥7 kgH2O2 (100%)/kgCat.d

Compared with traditional palladium catalysts, high-efficiency palladium catalysts have slightly smaller particle size, significantly lower bulk density, and larger pores on the surface of the catalyst, so high production capacity can be guaranteed while reducing the amount of catalyst loading, saving investment and cost. During the production process of the catalyst, the immersion depth of the active component can be controlled by adjusting the type and amount of the active component positioning agent pre-sprayed by the carrier, thereby prolonging the regeneration cycle and service life of the catalyst.

Compared with the use environment, traditional palladium catalysts are only suitable for fixed bed acid-base environments, while high-efficiency palladium catalysts are not only suitable for acid-base environments, but also for all-acid environments.

Product advantage

Shaanxi Kaida production of hydrogen peroxide with palladium catalyst has been put into the market since 2002, in 2005 began to cooperate with Sinopec Group Baling branch so far, the use of traditional palladium catalyst has been well received by users, according to Sinopec Group Baling branch hydrogen peroxide plant system usage feedback: the normal addition of anthraquinone device, the total amount of effective anthraquinone stable at more than 120g/L, the catalyst is stable, good selectivity, capacity slightly higher than 5.0kgH2O2 (100%)/kgCat.d, greatly more than other catalyst manufacturers 3.3 kgH2O2 (100%)/kgCat.d index, the actual use effect and life cycle is also far more than the expected technical indicators, reaching more than 8 years.

On August 5, 2015, in the hydrogen peroxide pilot system of XXX Company, the fully acidic environment high-efficiency anthraquinone hydrogenation catalyst KD-04H produced by our company was put into trial for six months, with an average hydrogen efficiency of 11.68g/L and an average production capacity of 8.25kgH2O2 (100%) /kgCat.d. The trial situation is good, and its performance has obvious advantages compared with other manufacturers' catalysts that were compared and evaluated on the same pilot plant in the same period.

In recent years, Kaida has provided hundreds of tons of traditional catalysts for Sinopec Group Baling Branch, Zhejiang Baling Hengyi Caprolactam Co., Ltd., 18 tons of high-efficiency palladium catalysts for XXX Company, and 30 tons of high-efficiency palladium catalysts for Heze Jufeng Company.

At present, the most obvious advantages of high-efficiency palladium catalysts produced by Kaida in Shaanxi are: 1) In the case of smaller bulk density (0.38~ 0.46g/ml), high compressive strength can be guaranteed, so as to meet the service life requirements. 2) Since the impregnation depth of the active components of the precious metal can be precisely adjusted, the same capacity can be guaranteed when the catalyst loading volume is the same, thereby reducing the amount of precious metal palladium, reducing the investment scale of the manufacturer and reducing the operating cost.

Customer use evaluation report (efficient palladium catalyst)

1. Under the same conditions, the reaction temperature is 65 ° C, the reaction pressure is 0.28 MPa, and the volume ratio of hydrogen to oil is 7.0.

2. The working fluid is taken from the 15wt/a 50% H2O2 unit of Changling Branch of Sinopec Group, with a limited anthraquinone content of 150g/L

3. The high-efficiency anthraquinone hydrogenation catalyst in an acidic environment was tried for six months, with an average hydrogen efficiency of 11.68g/L and an average production capacity of 8.25kgH2O2 (100%) /kgCat.d. The trial situation is good, and its performance has obvious advantages compared with other catalysts from other manufacturers who were compared and evaluated on the same pilot plant in the same period.