Invention Grant
- Patent Title: Methods and systems for producing para-xylene from C8-containing compositions
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Application No.: US16936904Application Date: 2020-07-23
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Publication No.: US11111192B2Publication Date: 2021-09-07
- Inventor: Zhonglin Zhang , Sohel K Shaikh , Veera Venkata R Tammana , Raed H. Abudawoud , Bruce Richard Beadle , Hisham Tawfiq Bassam , Rakan Sulaiman Bilaus
- Applicant: Saudi Arabian Oil Company
- Applicant Address: SA Dhahran
- Assignee: Saudi Arabian Oil Company
- Current Assignee: Saudi Arabian Oil Company
- Current Assignee Address: SA Dhahran
- Agency: Dinsmore & Shohl LLP
- Main IPC: B01J8/00
- IPC: B01J8/00 ; C07C5/22 ; C07C7/144 ; C07C15/08 ; C07C5/27 ; B01J16/00 ; B01J19/24 ; C07C7/00 ; C07C7/12 ; C07C7/14

Abstract:
A method for producing para-xylene (PX) includes introducing a C8 aromatic-containing composition to a xylene rerun column to separate the C8 aromatic-containing composition into a xylene-containing effluent and a heavy effluent and passing the xylene-containing effluent to a PX processing loop that includes a PX recovery unit operable to separate a PX product from the xylene-containing effluent, a membrane isomerization unit operable to convert a portion of the MX, OX, or both from the xylene-containing effluent to PX, an EB dealkylation unit operable to dealkylate EB from the xylene-containing effluent to produce benzene, toluene, and other C7− compounds, and a membrane separation unit operable to produce a permeate that is PX-rich and a retentate that is PX-lean. The permeate is passed to the PX recovery unit for recovery of PX, which the retentate is bypassed around the PX recovery unit circulated through the xylene processing loop.
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