Seeking assistance with UOP propane dehydrogenation process
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The main processes for PDH are as follows: (1) UOP’s Olefex process, which uses platinum-based catalysts； 2) LUMMUS’ Catofin process uses chromium-based catalysts; sulfur is typically added in the form of DMDS (dimethyl disulfide) with the aim of passivating the metal on the inner walls of the pipes and preventing it from falling off and clogging the catalyst mesh. Is sulfur addition required continuously throughout the entire reaction process? What is the approximate injection volume? The UOP Oleflex propane dehydrogenation process requires recycled hydrogen; what is the approximate proportion of recycled hydrogen in the feed?
This post was last edited by XLFDG on 2020-3-20 09:46. Note that DMDS is mainly used before and after the heat integration exchangers; in some installations, a sulfur injection point is also added at the outlet of Reactor 1 for continuous sulfur injection, with the amount of sulfur injected being determined based on the feed volume. The amount of recycled hydrogen is generally such that the hydrogen-to-hydrocarbon ratio in the reactor feed is around 0.5.
How can one determine whether a stable CrS metal barrier layer can be formed?