On the filtration and recovery of catalysts for hydrogenation reactions
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Recently, a pilot-scale test for catalyst hydrogenation reactions has been conducted, using precious metal catalysts with a particle size of around 2000 mesh. A continuous process with three reactors connected in series was employed. The current problems include: the use of external sintered tube filters, whose filtration pressure drop is around 0.1 MPa; however, a large amount of catalyst accumulates in these filters, resulting in poor filtering efficiency and catalyst leakage, which prevents the conversion rate from increasing. Before the pilot scale test, we also considered using membrane separation, but the flux was too low, so we had to give up on that idea. Is there anyone who has done research on catalyst filtration who could give some guidance? I would be extremely grateful! !
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The catalyst is not passed through a filter when first used.
When selecting a filter for catalyst filtration, specific process parameters and operating conditions must be taken into account: (1) The model of the filter can be chosen based on the characteristics of the filter, as well as the system’s requirements regarding pollution levels or filtering precision, along with factors such as system operating pressure and temperature, as well as the solid content and viscosity of the material； (2) The filter must have sufficient flow capacity (flow capacity refers to the maximum flow rate that can pass through the filter under a certain pressure drop); it should be selected based on the filter sample, taking into account its installation location within the system ； (3) For continuous filtration systems that cannot be shut down, filters with a switching or cross-flow design must be selected, allowing for online backblowing or backwashing without shutting down the system. For specific details, refer to this article: https://wenku.baidu.com/view/1503b16e326c1eb91a37f111f18583d049640fcd.html
Plate and frame filtration can be used; the key is still to improve the strength of the catalyst
Candle-type filtration system, which uses a filter cake layer to aggregate particles for adsorption and interception.
Could you share which process was ultimately adopted?