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US 2022/0033721 A1Published application
Recycle catalytic reforming process to increase aromatics yield
AssigneeSaudi Arabian Oil Company
InventorsOmer Refa Koseoglu, Robert Peter Hodgkins
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Abstract
The invention relates to a process and system arrangement to generate benzene, toluene and xylenes in a refinery. The process relies on recycling a C9+ aromatic bottoms stream from an aromatic recovery complex back to rejoining a hydrotreated naphtha stream as it enters a catalytic reformer. The aromatic bottoms can be further reacted through both the reformer and the subsequent aromatic recovery complex to transform to higher value compounds, thereby reducing waste or reducing bottoms' presence in gasoline pools.
Claims20
A method for recovery of benzene, toluene and xylene, the method comprising:
- supplying to a naphtha reforming unit (NREF) a stream of hydrotreated naphtha;
- allowing the stream to flow through the NREF to generate reformate and hydrogen gas;
- supplying at least a portion of reformate from the NREF to an aromatics recovery complex (ARC);
- flowing the portion of reformate in the ARC through a reformate splitter to generate a C7+ stream;
- flowing the C7+ stream through a second splitter to generate a C8+ stream;
- flowing the C8+ stream through a clay tower to deolefinate the C8+ stream;
- flowing the deolefinated C8+ stream through a xylene re-run splitter to obtain a C8 stream and a C9+ stream;
- and
- recycling the C9+ stream back to enter the stream of hydrotreated naphtha to thereby reprocess the C9+ stream to recover benzene, toluene and xylene.
6 more elements
Dependencies are inferred from the claim text.