Question

how we can regenerated fix bed reactor inside catalysts we want use again catalysts

Answer 1

Reference is taken from research paper titled "Method of removing and replacing catalyst in a multi-reactor cascade configuration"

A variety of catalyst removal and replacement strategies are employed conventionally. One of the simplest ways consists of halting the process after the efficiency of the reactor has deteriorated to an unacceptable level, and, if appropriate, regenerating in situ the catalyst that is retained inside the reactor column. Alternatively, the catalyst is removed and replaced. One drawback of these approaches is that the entire reactor operation must be halted during catalyst replenishment. Regeneration of the catalyst can take a considerable amount of time, causing appreciable reactor downtime and loss of productivity. Moreover, the catalyst that is removed is often only partially spent, and is replaced by fresh catalyst or routed to a regeneration system, which increases the cost of the process.