Why is recycled hydrogen added in the propane dehydrogenation reaction?
Thread Content
Newcomers don’t quite understand what role hydrogen plays in dehydrogenation reactions Seek an answer
The diagram shows a typical propane dehydrogenation process flow for UOP. If it is similar to the plant you mentioned, then the amount of recycled hydrogen is relatively small. Its main functions are: 1) to serve as the medium in the turbine expander, providing a cooling source for the cryogenic tank； 2 As a means to regulate the system’s hydrogen balance, control the equilibrium of the dehydrogenation reaction ； 3 Energy saving. If the process is different, that’s another matter.
1. Adding hydrogen to the reaction is thermodynamically unfavorable for the dehydration reaction to proceed; however, a platinum catalyst will become rapidly deactivated in the absence of hydrogen, and hydrogen plays a role in hydrodecomposition in this case. 2. The dehydrogenation reaction is an endothermic reaction, and a large amount of hydrogen serves to supply heat for the reaction.
The function of the shielding gas, as well as its recovery.
I’m wondering, what is the approximate proportion of recycled hydrogen used?