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Difference of catalysts for silver-formaldehyde

Release time: 2019-09-20

The silver formaldehyde process began to be industrialized. Under the condition of excessive air and under the safe condition of controlling the vapor concentration below 6.7%, the dehydrogenation and oxidation of methanol vapor, air and water vapor were carried out by the mixed vapor of methanol vapor and water vapor under the action of catalyst. The conversion rate of formaldehyde in this method is relatively high (98% - 99%), the consumption of methanol is reduced, and the concentration of formaldehyde produced can be as high as 50%. The advantage of this process is that the toxicity resistance of the catalyst is better; its disadvantage is that the process flow is complex, the investment cost is high, the energy consumption is large, and the content of by-products such as formic acid is relatively high, and so on.

In the case of excessive air, formaldehyde is almost oxidized by 94% of the volume. Its catalyst is a mixture of iron and molybdenum oxides. It is loaded into the tube of tubular oxidizer in the form of flakes, spheres or particles. When driving, it is heated by the heat conducting oil circulating between the tubes to 260 C. After the oxidation reaction occurs, the heat conducting oil is disassembled by the heat conducting oil. It can react at a lower temperature (300-380 C), thus reducing the generation of side reactions. It has high selectivity. It can directly obtain about 55% high concentration formaldehyde with low alcohols without rectification. Because the catalyst is packed in the tube, the bed can be well grasped. The homogeneity of the layer will not cause cracks and turnovers, and the life of the solid catalyst will be longer than one year.


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