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US 4,229,602 AGranted
Dehydrocyclization process
AssigneePhillips Petroleum Company
InventorsFrancis M. Brinkmeyer, Donald M. Haskell
Life of this patent
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Abstract
A process for catalytic reforming of hydrocarbons which comprises contacting aliphatic hydrocarbons with steam and a dehydrocyclization catalyst under dehydrocyclization conditions to form a vapor stream containing aromatics and nonaromatics, separating at least a portion of the vapor stream which is compressed, heated, and recycled to the dehydrocyclization reaction to minimize steam diluent requirements for the process.
Claims8
A process for producing aromatics from aliphatic hydrocarbons which comprises the steps of
- (a) contacting a feed comprising aliphatic hydrocarbons with steam and a dehydrocyclization catalyst under steam-active dehydrocyclization conditions sufficient to form a vapor stream comprising aromatics, nonaromatics, and hydrogen,
- (b) separating at least a portion of said vapor stream and increasing the pressure thereof by compressing same and then heating the compressed vapor to approximately the dehydrocyclization temperature and pressure, and
- (c) recycling said compressed and heated vapor stream to the dehydrocyclization reaction in step (a) at a gradually increased rate such that the amount of steam diluent used in (a) is gradually reduced after startup of the process to a point where the steam is replaced or substantially replaced with said recycle as the diluent for the process.
Dependencies are inferred from the claim text.