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Application and maintenance of stainless steel sintered filter element in petroleum and petrochemical industry

by:Lvyuan      2022-06-20
In the petroleum and petrochemical industry, the stainless steel sintered filter element has many excellent properties such as high filtration accuracy, high temperature resistance, corrosion resistance, high mechanical strength, easy processing and long service life, so it is more and more used in the separation of products and process media. middle. For example, the application of stainless steel metal powder sintered filter element in the hydroxylamine reaction catalyst filter in the production process of caprolactam, and the application of stainless steel multi-layer metal wire mesh sintered filter element in the catalytic cracking oil slurry filter have achieved good separation results. Although the stainless steel sintered filter element has high mechanical strength and strong corrosion resistance, the filter element is still damaged during use. The stainless steel sintered filter element can not only be used as the filter medium of the filter equipment such as basket filter and mesh filter, but also because the stainless steel sintered filter element has the advantages of high filtration accuracy, high temperature resistance, corrosion resistance, high mechanical strength, easy processing, long service life, etc. Excellent performance, so it is more and more used in the separation of products and process media in the petroleum and petrochemical industry. For example, the application of stainless steel metal powder sintered filter element in the hydroxylamine reaction catalyst filter in the production of caprolactam, and the application of stainless steel multi-layer metal wire mesh sintered filter element in the catalytic cracking oil slurry filter have achieved good separation results. In the petroleum and petrochemical industry, although the stainless steel sintered filter element has high mechanical strength and strong corrosion resistance, the filter element is still damaged and broken during use. The damage and breakage of the filter element is mainly due to the fact that the filter element is in the regeneration process. In order to remove the catalyst particles that cause the filter element to block or the oil slurry remaining on the filter element surface, the roasting method is generally used. During the roasting process, it is unavoidable that the local high temperature of the filter element is caused, and the carrier of the caprolactam hydroxylamine reaction catalyst is activated carbon. At high temperature, the carbon will penetrate into the stainless steel material, causing the material to carburize. The carbon content in stainless steel is greatly increased, which reduces the mechanical properties and corrosion resistance of stainless steel materials. The carburized stainless steel material is alkali brittle during further alkaline regeneration treatment, resulting in a significant decrease in mechanical strength, and the filter element is damaged when it is impacted. In view of the fact that the damage of the filter element is mainly due to the carburization of the filter element during the regeneration process, and carburization can only occur at high temperature, the fundamental solution is to avoid the roasting of the filter element during the regeneration process. Solution immersion or ultrasonic cleaning can be used.
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