How to extend the service life of bearings under the same conditions for anhydrous hydrogen fluoride, phenol, and propanol
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The reactants are anhydrous hydrogen fluoride, phenol, and propylene; the temperature in the reaction vessel is 85 degrees, and the reaction time is 17 hours. The bearings of the magnetic drive unit, model 6314, corrode and can only last for a little over a month. Is there any way to extend the lifespan of these bearings?
It is mainly corroded, with a pressure of 0.7 Ma
The main issue is corrosion; after 40 days of use, the balls became one-third smaller, with minimal wear, and lubricant was added
Then strengthen seal management to prevent the bearings from coming into contact with materials; for example, sealing gas can be used, and zirconia bearings or PEEK plastic bearings can also be tried (it’s not clear whether they can withstand hydrofluoric acid)
This issue is indeed difficult to handle. There are two approaches: one is to consider anti-corrosion measures, and the other is to think about whether the transmission system can be improved to avoid contact with the medium.
Handico polymer composite repair material is specifically designed to address wear and corrosion issues in bearing housings, bearing seats, and bearing locations.
Where are the bearings located? Can the bearing be located at the upper end of the mechanical seal, without coming into contact with the material? There are many options available for machine seals.
From a safety perspective, there is a concern regarding the leakage of anhydrous hydrogen fluoride; the reactor is under a pressure of 7 kilograms. A magnetic drive is used instead of a mechanical seal, and the bearings of the magnetic drive come into contact with the material inside the reactor.
The bearings can be made of S22053 double-sided stainless steel, which forms a passivation layer that enhances their resistance to corrosion.