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US4041091A
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Fractionation of aromatic streams
Assignee: Honeywell UOP LLC
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Filing: 1976-02-19
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Granted: 1977-08-09
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Expires: 1996-02-19
Abstract
Abstract A fractionation scheme applicable to a transalkylation process in which an admixture of toluene and C9 alkylbenzene is converted to benzene and C8 alkylbenzene is disclosed. Transalkylation zone effluent containing C6 to C10+ alkylbenzene is passed into a fractionation zone wherein an admixture of benzene and toluene is withdrawn as a lower boiling fraction, and C8+ alkylbenzenes are withdrawn in admixture as a higher boiling fraction. The benzene and toluene fraction is introduced into a fractionator and separated therein. The C8+ fraction is fractionated into xylenes and C9+. The C9+ fraction is fractionated into a C9/C10 overhead fraction and C10+ bottoms fraction. Toluene and C9/C10 are then fed to the transalkylation zone. Significant savings in utilities are realized by using a xylene vapor fraction to reboil the column fractionating transalkylation zone effluent, and by using the C9/C10 vapor fraction to reboil the column fractionating benzene and toluene.
Inventors
- 👤 Michel Jacques Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 00:28
CPC Classifications
C; C07; C07C; C07C15/00; C07C15/02; C07C15/067; C07C15/08; C07C15/04; C07C7/00; C07C7/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
263 words
A combination xylene separation and a toluene transalkylation process, for producing benzene and orthoxylene comprising the steps of: a. transalkylating a mixture of toluene and C 9 alkylbenzene in a transalkylation zone at transalkylation conditions to produce a transalkylation zone effluent comprising benzene, toluene, C 8 alkylbenzenes, C 9 alkylbenzenes, and C 10 alkylbenzenes; b. fractionating at least a portion of said transalkylation zone effluent in a distillation column wherein benzene and toluene are recovered as an overhead fraction and materials heavier than toluene are recovered as a bottoms fraction; c. fractionating said benzene and toluene fraction in a fractionation column to produce a benzene product and to recover a toluene-rich stream which comprises at least a portion of the charge to the transalkylation zone; d. passing at least a portion of said bottoms fraction, comprising material heavier than toluene, into a xylene fractionator, and recovering overhead a stream comprising orthoxylene and recovering as a bottoms fraction a stream comprising C 9 and C 10 alkylbenzenes; e. passing the C 9 and C 10 alkylbenzene bottoms fraction to a fractionation zone to recover overhead a stream comprising C 9 alkylbenzenes, at least a portion of which C 9 alkylbenzenes stream is charged to the transalkylation zone; f. reboiling the column producing benzene product by indirect heat exchange with vapors from the column producing C 9 alkylbenzenes as an overhead fraction; and, g. reboiling the column producing benzene and toluene as an overhead fraction by indirect heat exchange with a stream comprising orthoxylene vapors obtained as an overhead vapor fraction from the xylene fractionator.
Claim 2
Dependent Claim
263 words
A combination xylene separation and a toluene transalkylation process, for producing benzene and orthoxylene comprising the steps of: a. transalkylating a mixture of toluene and C 9 alkylbenzene in a transalkylation zone at transalkylation conditions to produce a transalkylation zone effluent comprising benzene, toluene, C 8 alkylbenzenes, C 9 alkylbenzenes, and C 10 alkylbenzenes; b. fractionating at least a portion of said transalkylation zone effluent in a distillation column wherein benzene and toluene are recovered as an overhead fraction and materials heavier than toluene are recovered as a bottoms fraction; c. fractionating said benzene and toluene fraction in a fractionation column to produce a benzene product and to recover a toluene-rich stream which comprises at least a portion of the charge to the transalkylation zone; d. passing at least a portion of said bottoms fraction, comprising material heavier than toluene, into a xylene fractionator, and recovering overhead a stream comprising orthoxylene and recovering as a bottoms fraction a stream comprising C 9 and C 10 alkylbenzenes; e. passing the C 9 and C 10 alkylbenzene bottoms fraction to a fractionation zone to recover overhead a stream comprising C 9 alkylbenzenes, at least a portion of which C 9 alkylbenzenes stream is charged to the transalkylation zone; f. reboiling the column producing benzene product by indirect heat exchange with vapors from the column producing C 9 alkylbenzenes as an overhead fraction; and, g. reboiling the column producing benzene and toluene as an overhead fraction by indirect heat exchange with a stream comprising orthoxylene vapors obtained as an overhead vapor fraction from the xylene fractionator.
Claim 3
Dependent Claim
37 words
Process of claim 1 wherein the xylene fractionator is a single fractionator, wherein C 8 alkylbenzenes, including orthoxylene, are recovered as an overhead vapor fraction and C 9 and heavier alkylbenzenes are recovered as a bottoms fraction.
Claim 4
Dependent Claim
62 words
Process of claim 1 wherein the xylene fractionator comprises two fractionators, a xylene splitter wherein meta- and para-xylene are recovered as an overhead fraction and orthoxylene and heavier alkylbenzenes recovered as a bottoms fraction are charged to an orthoxylene column wherein orthoxylene is recovered overhead as an overhead vapor fraction and C 9 and heavier alkylbenzenes are recovered as a bottoms fraction.
Claim 5
Dependent Claim
33 words
Process of claim 3 wherein the meta- and para-xylene overhead fraction is charged to an isomerization zone and at least a portion of the isomerization zone effluent is charged to the xylene splitter.
Claim 6
Dependent Claim
49 words
Process of claim 1 wherein the transalkylation zone effluent also contains alkylbenzenes heavier than C 10 and wherein the fractionator in step (e) recovers overhead a stream comprising C 9 and C 10 alkylbenzenes and recovers as a bottoms fraction a stream comprising alkylaromatics heavier than C 10 .
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |