| 摘要 |
A multiple reaction zone process for dehydrogenating light hydrocarbons, preferably propane, is disclosed. The feed stream and intermediate streams are first heated by indirect heat exchange to temperatures slightly below the desired inlet temperature of the dehydrogenation catalyst beds. These streams are then transported to a location which is in close proximity of the dehydrogenation catalyst bed and further heated by the selective combustion of hydrogen present in these streams through the use of beds of oxidation catalyst. This eliminates lengthy high temperature reactant residence times in transfer lines extending between fired heaters and the dehydrogenation catalyst beds, thereby reducing thermal cracking of the feed and increasing the selectivity of the process. The process has special utility with stacked moving bed reactors, which have larger volume reactant transfer lines.
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