Hydrogenation unit feed backwash filter element
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The solid content in the feed material for our company’s hydrogenation reactors has a low particle size (generally below 20 ppm). The original filter elements used were made of stainless steel wedge-shaped wire mesh, and their filtering efficiency was not satisfactory. I’m curious to know what type of filter elements others use
In fact, the solid particle content in hydrogenation feedstocks is very low; the more problematic substances are the gel-like materials. This substance has a small particle size, making it difficult to remove with conventional filtering elements such as screens. A special degumming filter element must be used
The filter elements used in hydrogenation processes typically have a pore size of 25 microns. The raw materials used for hydrogenation are required to be free of solids, and the precision of these filters generally meets the required standards. Unless the filter element is leaking or a bypass line is open. However, with any type of filter element, during backwashing, a certain amount of oil will pass through the filter element without being filtered and is carried away directly; this is a design issue, not a problem with the filter itself.
Many people who use backwashing claim that their filtration precision is 25 microns. But during actual operation, check whether backwashing occurs frequently or not, and see if the pressure drop in the reactor rises quickly. I’ve seen cases where backwashing occurred after just a few minutes, as well as cases where the reactor’s pressure drop was resolved after a month
Wedge-shaped wire filters are basically used, and most of them are in a state of struggle; so far, no revolutionary filter elements have emerged
That’s right. But in any case, the catalyst in the reactor must be protected. The reactor pressure drop cannot rise so quickly