Invention Grant
- Patent Title: Processes for recovering paraxylene
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Application No.: US15600494Application Date: 2017-05-19
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Publication No.: US10351489B2Publication Date: 2019-07-16
- Inventor: Michael Salciccioli , Gaurav Agrawal , Michael W. Weber , Dana L. Pilliod , Catherine M. Dorsi
- Applicant: ExxonMobil Chemical Patents Inc.
- Applicant Address: US TX Baytown
- Assignee: ExxonMobil Chemical Patents Inc.
- Current Assignee: ExxonMobil Chemical Patents Inc.
- Current Assignee Address: US TX Baytown
- Priority: EP16185649 20160825
- Main IPC: C07C5/13
- IPC: C07C5/13 ; C07C7/12 ; C07C15/08 ; C07C7/13 ; C07C7/11 ; C07B63/04 ; C07C5/27 ; C07C7/148

Abstract:
Disclosed is a process for recovering paraxylene in which a first simulated moving bed adsorption unit is used to produce two extract streams—one rich in paraxylene and a paraxylene-rich extract stream that is lean in ethylbenzene and an ethylbenzene-rich extract stream that is lean in paraxylene- and a paraxylene-depleted raffinate stream. A significant amount of the ethylbenzene is removed in the ethylbenzene-rich extract stream (at least enough to limit buildup in the isomerization loop), so the paraxylene-depleted raffinate stream may be isomerized in the liquid phase. Avoiding vapor phase isomerization saves energy and capital, as liquid phase isomerization requires less energy and capital than the vapor phase isomerization process due to the requirement of vaporizing the paraxylene-depleted stream and the use of hydrogen, which requires an energy and capital intensive hydrogen recycle loop.
Public/Granted literature
- US20180002252A1 Processes for Recovering Paraxylene Public/Granted day:2018-01-04
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