US4463209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aromatics processing
Assignee: Mobil Oil AS
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Filing: 1983-09-19
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Granted: 1984-07-31
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Expires: 2003-09-19
Abstract
Abstract Improved aromatic conversion processes are provided by novel regeneration techniques. Aromatic processes that would benefit from this invention include those processes using catalysts comprising zeolites having a silica to alumina mole ratio of at least about 12 and a constraint index within the approximate range of 1 to 12 and which require regeneration to burn off coke from said catalysts. The improvement of the instant invention resides in conducting said regeneration in the presence of steam under controlled conditions to enhance the activity of the catalysts.
Inventors
- 👤 Christine H. Kursewicz
- 👤 John P. McWilliams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:36
CPC Classifications
C; C07; C07C; C07C6/00; C07C6/08; C07C6/12; C07C6/123; B; B01; B01J; B01J29/00; B01J29/90; C07C2/00; C07C2/54; C07C2/64; C07C2/66; C07C4/00; C07C4/02; C07C4/06; C07C5/00; C07C5/22; C07C5/27; C07C5/2702; C07C5/2708; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/40; C07C2529/65; C07C2529/70; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
136 words
In a process for the conversion of aromatic containing feedstocks in which said feedstocks are contacted in a reactor vessel, under conversion conditions, with a catalyst comprising a zeolite having a silica to alumina mole ratio of at least 12 and a constraint index within the approximate range of 1 to 12, and which includes a regeneration step to burn off carbonaceous materials which deposit on said catalyst, said regeneration step comprising contacting said catalyst containing carbonaceous materials with oxidizing gas, the improvement which comprises conducting the regeneration step in the presence of steam at controlled regeneration conditions including a steam partial pressure of between about 0.1 psia and about 4.0 psia, a contact time of between about 12 hours and about 72 hours and a temperature of between about 750° F. and about 1000° F.
Claim 2
Dependent Claim
136 words
In a process for the conversion of aromatic containing feedstocks in which said feedstocks are contacted in a reactor vessel, under conversion conditions, with a catalyst comprising a zeolite having a silica to alumina mole ratio of at least 12 and a constraint index within the approximate range of 1 to 12, and which includes a regeneration step to burn off carbonaceous materials which deposit on said catalyst, said regeneration step comprising contacting said catalyst containing carbonaceous materials with oxidizing gas, the improvement which comprises conducting the regeneration step in the presence of steam at controlled regeneration conditions including a steam partial pressure of between about 0.1 psia and about 4.0 psia, a contact time of between about 12 hours and about 72 hours and a temperature of between about 750° F. and about 1000° F.
Claim 3
Dependent Claim
47 words
The process of claim 1 wherein the regeneration conditions include a steam partial pressure of between about 1.0 psia and about 2.0 psia, a contact time of between about 24 hours and about 48 hours and a temperature of between about 750° F. and about 1000° F.
Claim 4
Dependent Claim
22 words
The process of claim 1 wherein said zeolite is selected from the group consisting of ZSM-5, ZSM-11, ZSM-12, ZSM-23, ZSM-35 and ZSM-38.
Claim 5
Dependent Claim
10 words
The process of claim 3 wherein said zeolite is ZSM-5.
Claim 6
Dependent Claim
46 words
The process of claim 1 wherein said conversion is isomerization and said conversion conditions include a temperature of between about 500° F. and 1000° F., a pressure of between about atmospheric and 1,000 psig, and a weight hourly space velocity of between about 0.5 and 250.
Claim 7
Dependent Claim
11 words
The process of claim 5 wherein said conversion is xylene isomerization.
Claim 8
Dependent Claim
47 words
The process of claim 1 wherein said conversion is toluene disproportionation and said conversion conditions include a temperature of between about 400° F. and 1400° F., a pressure of between about atmospheric and 1,000 psig, and a weight hourly space velocity of between about 0.1 and 20.
Claim 9
Dependent Claim
46 words
The process of claim 1 wherein said conversion is alkylation and said conversion conditions include a temperature of between about 100° F. and 950° F., a pressure of between about 25 and 800 psig, and a weight hourly space velocity of between about 1 and 20.
Claim 10
Dependent Claim
46 words
The process of claim 1 wherein said conversion is transalkylation and said conversion conditions include a temperature of between about 650° F. and 1100° F., a pressure of between about 25 and 800 psig, and a weight hourly space velocity of between about 1 and 20.
Claim 11
Dependent Claim
46 words
The process of claim 1 wherein said conversion is cracking and said conversion conditions include a temperature of between about 700° F. and 1200° F., a pressure of between about atmospheric and 200 psig, and a weight hourly space velocity of between about 0.5 and 50.
Claim 12
Dependent Claim
33 words
The process of claim 1 wherein the regeneration step further comprises withdrawing a hot combustion stream gas from said reactor through a cooler and separator and returning said gases back to the reactor.
Claim 13
Dependent Claim
12 words
The process of claim 11 wherein said hot gas stream contains steam.
Claim 14
Dependent Claim
21 words
The process of claim 11 wherein said separator is maintained at a temperature of between about 35° F. and 150° F.
Claim 15
Dependent Claim
21 words
The process of claim 11 wherein said separator is maintained at a temperature of between about 60° F. and 150° F.
Claim 16
Dependent Claim
13 words
The process of claim 1 wherein said oxidizing gas is oxygen containing mixtures.
Claim 17
Dependent Claim
11 words
The process of claim 15 wherein said oxidizing gas is air.
Claim 18
Dependent Claim
19 words
The process of claim 1 wherein said steam partial pressure is between about 0.25 psia and about 3.7 psia.
References Cited (Backward Citations)
US3751504A
Cited
US3907663A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-31 | 1988-01-30 | 1988-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-31 | 1992-01-30 | 1992-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-31 | 1996-01-30 | 1996-07-31 | $7700.00 | Window Closed / Lapsed |