Processes and apparatuses for operating a hydrocarbon conversion zone

A process for dehydrogenation of a hydrocarbon, the process comprising:

• passing a sulfur containing feed stream comprising hydrocarbons to a dehydrogenation zone comprising at least one reactor receiving a dehydrogenation catalyst and being operated at dehydrogenation conditions to provide a product stream enriched in dehydrogenated hydrocarbons compared to the feed stream,
• wherein the dehydrogenation conditions are based on a sulfur control index determined by one or more of:
• a pressure of the at least one reactor;
• a temperature associated with the at least one reactor;
• and a hydrogen to hydrocarbon ratio,
• wherein a first dehydrogenation condition in the sulfur control index is selected and a second dehydrogenation condition is adjusted to a corresponding second dehydrogenation condition based on the sulfur control index and the selected, first dehydrogenation condition, and
• wherein sulfur control index is determined using Equation 1, wherein Equation 1 comprises
• INDEX
• =
• Const
• ⁡
• (
• Feed
• )
• ·
• Const
• ⁡
• (
• Metallurgy
• )
• ·
• e
• -
• 137.6
• ⁢
• kcal
• mol
• R
• IG
• ·
• Temp
• ·
• [
• (
• HC_Residence
• )
• 2.03
• P
• HC
• 1.14
• ·
• (
• P
• H
• ⁢
• 2
• ⁢
• S
• P
• H
• ⁢
• 2
• )
• 4.
• ]
• .