US4686312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aromatics production
Assignee: Mobil Oil AS
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Filing: 1986-10-23
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Granted: 1987-08-11
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Expires: 2006-10-23
Abstract
Abstract Disclosed is a multistage process for converting lower aliphatic oxygeanated hydrocarbon feedstock to hydrocarbon product rich in benzene, toluene and/or xylene which comprises: contacting said oxygenated hydrocarbons in a primary stage with a medium pore shape selective acidic zeolite to an intermediate hydrocarbon product comprising predominantly aliphatic hydrocarbons; contacting at least a portion of the aliphatic hydrocarbons from the primary stage with a secondary stage catalyst comprising gallium-promoted medium pore shape selective zeolite characterized by a constraint index within the approximate range of 1 to 12 and a silica to alumina ratio of about 20 to 100:1; thereby producing benzene, toluene and/or xylene.
Inventors
- 👤 Yung-Feng Chu
- 👤 Arthur W. Chester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:45
CPC Classifications
C; C07; C07C; C07C15/00; C07C15/02; C07C15/06; C07C1/00; C07C1/20; C07C15/04; C07C15/067; C07C15/08; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/40; C07C2529/42; C07C2529/44; C07C2529/46; C07C2529/65; C07C2529/70
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
136 words
A multistage process for converting lower aliphatic oxygenated hydrocarbon feedstock to hydrocarbon product rich in benzene, toluene and/or xylene which comprises: contacting said oxygenated hydrocarbons in a primary stage with a medium pore shape selective acidic zeolite to an intermediate hydrocarbon product comprising predominantly aliphatic hydrocarbons; contacting at least a portion of the aliphatic hydrocarbons from the primary stage with a secondary stage catalyst comprising gallium-promoted medium pore shape selective zeolite characterized by a constraint index within the approximate range of 1 to 12 and a silica to alumina ratio of about 20 to 100:1; thereby producing benzene, toluene, xylene and C 9 + aromatic hydrocarbons; fractionating to recover a C 9 + aromatic-rich stream; and recycling said C 9 + aromatic stream to the secondary stage for further reaction in contact with the metal-promoted catalyst.
Claim 2
Dependent Claim
136 words
A multistage process for converting lower aliphatic oxygenated hydrocarbon feedstock to hydrocarbon product rich in benzene, toluene and/or xylene which comprises: contacting said oxygenated hydrocarbons in a primary stage with a medium pore shape selective acidic zeolite to an intermediate hydrocarbon product comprising predominantly aliphatic hydrocarbons; contacting at least a portion of the aliphatic hydrocarbons from the primary stage with a secondary stage catalyst comprising gallium-promoted medium pore shape selective zeolite characterized by a constraint index within the approximate range of 1 to 12 and a silica to alumina ratio of about 20 to 100:1; thereby producing benzene, toluene, xylene and C 9 + aromatic hydrocarbons; fractionating to recover a C 9 + aromatic-rich stream; and recycling said C 9 + aromatic stream to the secondary stage for further reaction in contact with the metal-promoted catalyst.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein the metal of said secondary stage catalyst comprises about 0.1 to 1 wt % gallium.
Claim 4
Dependent Claim
37 words
The process of claim 1 wherein said primary stage zeolite catalyst comprises ZSM-5 acidic porous crystalline zeolite having a silica to alumina ratio of about 20 to 100:1, and said primary stage is conducted at elevated temperature.
Claim 5
Dependent Claim
43 words
The process of claim 1 wherein second stage conversion conditions include a temperature of from about 300° to about 650° C., a pressure of from about 1×10 5 to about 30.×10 5 pascal and a WHSV of from about 0.1 to about 10.
Claim 6
Dependent Claim
30 words
The process of claim 1, 2, 3, or 4 wherein said zeolite of both stages is selected from the group consisting of ZSM-5, ZSM-11, ZSM-12, ZSM-23, ZSM-35, ZSM-38, and ZSM-48.
Claim 7
Dependent Claim
16 words
The process of claim 1 wherein the oxygenate feedstock comprises methanol, dimethyl ether or mixtures thereof.
Claim 8
Dependent Claim
32 words
The process of claim 1 wherein the second stage aromatics product contains a major amount of C 6 -C 8 aromatic hydrocarbons and a minor amount of C 9 + aromatic hydrocarbons.
Claim 9
Dependent Claim
32 words
The process of claim 7 wherein said C 9 + aromatics are recycled and further converted in the second stage by transalkylation to increase the production of C 6 -C 8 aromatics.
Claim 10
Dependent Claim
151 words
In the process for converting oxygenated hydrocarbon feedstock rich in methanol or dimethyl ether in a first stage contacting said feedstock at elevated temperature with an acid medium pore shape selective metallosilicate zeolite catalyst to produce heavier hydrocarbons containing predominantly aliphatics, the improvement which comprises: further converting at least a portion of the heavier hydrocarbons in a second stage to light aromatics rich in benzene, toluene and/or xylene by contacting said heavier hydrocarbons at elevated temperature with a metal-promoted medium pore shape selective metallosilicate zeolite catalyst under aromatization conditions to produce said light aromatics and a minor amount of C 9 + heavy aromatics; recovering said C 9 + heavy aromatics for recycle to said second stage; and further converting said C 9 + heavy aromatics in said second stage in contact with the metal-promoted medium pore shape selective metallosilicate zeolite catalyst to increase C 6 -C 8 light aromatic production.
Claim 11
Dependent Claim
151 words
In the process for converting oxygenated hydrocarbon feedstock rich in methanol or dimethyl ether in a first stage contacting said feedstock at elevated temperature with an acid medium pore shape selective metallosilicate zeolite catalyst to produce heavier hydrocarbons containing predominantly aliphatics, the improvement which comprises: further converting at least a portion of the heavier hydrocarbons in a second stage to light aromatics rich in benzene, toluene and/or xylene by contacting said heavier hydrocarbons at elevated temperature with a metal-promoted medium pore shape selective metallosilicate zeolite catalyst under aromatization conditions to produce said light aromatics and a minor amount of C 9 + heavy aromatics; recovering said C 9 + heavy aromatics for recycle to said second stage; and further converting said C 9 + heavy aromatics in said second stage in contact with the metal-promoted medium pore shape selective metallosilicate zeolite catalyst to increase C 6 -C 8 light aromatic production.
Claim 12
Dependent Claim
26 words
The process of claim 9 wherein said metal-promoted zeolite catalyst comprises a ZSM-5 zeolite having deposited thereon about 0.1 to 1 wt % gallium metal promoter.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-10 | 1991-02-09 | 1991-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-10 | 1995-02-09 | 1995-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-10 | 1999-02-09 | 1999-08-11 | $7700.00 | Window Closed / Lapsed |