Silver-electrolyzing catalyst composition and silver-electrolyzing catalyst bed

Abstract

The invention discloses an electrolytic silver catalyst composition, which is composed of the fiber type electrolytic silver and crystal electrolytic silver, the weight ratio of two points is 10-35: 65-90, of which, the particles of crystal electrolysis silver is 8-24 head, the particles of fiber type electrolytic silver is 32-40 head, the catalyst bed is formed by electrolytic silver composition, including crystal electrolytic silver layer and fiber silver electrolysis layer and a catalyst layer, the two layer parallel setting from down to up, the down surface of catalyst layer set with silk screen. This invention's product life extend 25% compared with existing products, the existing fiber-electrolytic silver catalyst life is 45 days, and use this invention of electrolytic silver catalyst to produce at least 60 consecutive days; Furthermore, the catalyst layer of the invention products increased resistance rate relieve considerably, reduced Blower power, saving power consumption, and improved the capacity of the device.

Description

technical field [0001] The invention relates to a silver catalyst, in particular to an electrolytic silver catalyst composition and an electrolytic silver catalyst bed for preparing formaldehyde. Background technique [0002] Formaldehyde is one of the main raw materials for making adhesives for wood-based panels such as urea-formaldehyde resin. Its main process is to mix methanol, air, and water vapor in a certain proportion to evaporate and preheat into the oxidation reactor. Oxidative dehydrogenation reaction occurs on the catalyst bed under the temperature of ℃ to generate formaldehyde gas, and a certain concentration of formaldehyde product is obtained after absorption. Therefore, the quality of formaldehyde and the level of output depend to a large extent on the quality and stability of the catalyst . [0003] In the process of producing formaldehyde through the oxidative dehydrogenation of methanol, there are mainly three kinds of catalysts used: pumice silver, elect...

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Problems solved by technology

[0005] Although the structure of this high-purity fiber-type electrolytic silver catalyst is relatively loose, the specific surface area and porosity are large, so the reaction activity is good and the conversion rate of formaldehyde is high (more than 96.5%), but due to its low crystallinity, there are certain non-productive Shaped area, so it does not have a certain shape, poor mechanical strength, requires manual granulation, long melting range, easy to sinter, resulting in deep oxidation of methanol and short circuit of raw material gas, large gas resistance, usually about one and a half months after use , the resistance of the catalytic layer of the system reaches more than 1300 mm water column, so the service life of the catalyst is short, generally only 1.5 months, that is, it needs to stop frequently to replace the catalyst, which not only affects the production, but also increases the manufacturing cost

[0006] In addition, at present, a technology of loading silver on a carrier to make a silver catalyst has been developed. For example, in the invention patent with the announcement number CN1103244C and the name "New Loaded Silver Catalyst and Its Preparation Method", a silver loaded catalyst is disclosed. Catalyst, although this kind of catalyst is resistant to sintering and prolongs the life of the catalyst, but its thermal conductivity is poor, and it is not easy to regenerate or the regeneration cost is high

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