| http://www.w3.org/ns/prov#value | - The sequence of steps is repeated in the third stage and so on, until a final conversion effluent is produced. [0116] The apparatus can function in fixed bed mode for a long period of time, for example two or three days, then it can function in moving bed mode by periodic controlled opening of the extraction valve, for example for a period of time not exceeding one hour. [0117] The non-limiting ex
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