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Long-acting catalyst for electrolytic silver

A technology for electrolytic silver and catalyst, applied in the direction of organic chemistry, etc., can solve the problems of high temperature of silver nitrate liquid in electrolytic cells, poor mechanical strength, short silver filament fibers, etc., and achieves improved oxidizer productivity, high conversion rate, and is not easy to fall off. Effect

Inactive Publication Date: 2007-03-28
李洪伟 +1
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Problems solved by technology

[0002] At present, electrolytic silver is widely used in the production of formaldehyde by silver method as a catalyst for the chemical reaction of methanol oxidative dehydrogenation. Although it has a history of more than 40 years in China, the electrolytic silver preparation process has been used and has not changed.
[0003] The problem with the traditional electrolytic silver catalyst manufacturing process is that the silver nitrate liquid temperature in the electrolytic cell is high
There are 30% non-DC components in the power supply for electrolysis, resulting in short silver fibers formed by electrolysis and poor mechanical strength, which are fragile and easy to break

Method used

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Embodiment Construction

[0007] The special electrolytic power supply scheme that replaces the traditional silicon rectifier DC power supply is that a large amount of AC or pulsating components in the DC power must be filtered out to ensure that the useful DC pulsating components account for 1%. Because the useless current will do heat work in the electrolytic solution, consume the effective components of the electrolyte, and the heat emitted will aggravate the temperature rise and unfavorable cooling control, wasting cooling water resources and electric energy. The special electrolysis power supply automatically controls the working current required by the electrolytic cell with constant current, which ensures the temperature of the silver nitrate liquid surface. The heat in the electrolysis process is always in the best state, no longer needs cooling water, and the natural heat release temperature is within 55 °C. The function of 1% DC pulsating component is to regenerate short dendritic fibers on th...

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Abstract

The present invention relates to a long-acting electrolytic silver catalyst made up by using DC powder supply 1% pulsating component. When the chemical product formaldehyde is produced, said silver catalyst can make period be up to 120-180 days. The catalyst silver ed is low in resistance, good in air permeability and high in conversion rate.

Description

Technical field [0001] The invention provides an electrolytic silver catalyst used in methanol oxidative dehydrogenation chemical reaction. The catalyst required for formaldehyde production in the chemical industry is generally electrolytic silver, and the service life of traditional electrolytic silver catalysts is about 60 to 90 days. The long-acting electrolytic silver catalyst proposed by the invention can continuously supply formaldehyde for 120-180 days. Its excellent performance is characterized by good air permeability, low resistance, slow rise in catalytic bed resistance, and low power consumption of air supply equipment. The original device using this catalyst can increase production by 15% compared with traditional catalysts, and the fan can save 20% of electricity. Background technique [0002] At present, electrolytic silver is widely used in the production of formaldehyde by silver method as a catalyst for the chemical reaction of methanol oxidative dehydrog...

Claims

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Application Information

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IPC IPC(8): B01J23/50C25C1/20C25C5/02C07C47/055
Inventor 李洪伟李伟明
Owner 李洪伟
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