US4864070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the separation of ortho chlorinated aromatic isomers by selective adsorption
Assignee: BP Corp North America Inc
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Filing: 1988-03-28
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Granted: 1989-09-05
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Expires: 2008-03-28
Abstract
Abstract A process is disclosed for separation of ortho chlorotoluene and ortho-dichlorobenzene from their meta and para isomers by use of a specific crystalline aluminophosphate adsorbent which selectively removes the above ortho aromatic isomers. The selectively adsorbed ortho aromatic isomers are removed from the adsorbent through a desorption step.
Inventors
- 👤 Melvern C. Hoff
- 👤 Raymond C. Feld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:40
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/38; C07C17/389
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
121 words
An adsorptive separation process for separating an ortho chlorinated aromatic compound selected from the group consisting of ortho-chlorotulene and ortho-dichlorobenzene from a chlorinated aromatic hydrocarbon feed stream consisting essentinlly of a mixture of meta and para isomers of said ortho chlorinated aromatic compound, which process comprises (a) contacting said chlorinated aromatic hydrocarbon feed stream with a bed of a crystalline aluminophosphate adsorbent of AlPO 4 -5; (b) withdrawing from said bed of adsorbent a raffinate stream containing less of the selectively adsorbed ortho chloriated aromatic compound of the feed stream; (c) desorbing the adsorbed ortho chlorinated aromatic compound with a desorbent to effect displacement thereof; and (d) withdrawing from the adsorbent bed an extract stream containing the ortho chlorinated aromatic compound.
Claim 2
Dependent Claim
121 words
An adsorptive separation process for separating an ortho chlorinated aromatic compound selected from the group consisting of ortho-chlorotulene and ortho-dichlorobenzene from a chlorinated aromatic hydrocarbon feed stream consisting essentinlly of a mixture of meta and para isomers of said ortho chlorinated aromatic compound, which process comprises (a) contacting said chlorinated aromatic hydrocarbon feed stream with a bed of a crystalline aluminophosphate adsorbent of AlPO 4 -5; (b) withdrawing from said bed of adsorbent a raffinate stream containing less of the selectively adsorbed ortho chloriated aromatic compound of the feed stream; (c) desorbing the adsorbed ortho chlorinated aromatic compound with a desorbent to effect displacement thereof; and (d) withdrawing from the adsorbent bed an extract stream containing the ortho chlorinated aromatic compound.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein said feed stream comprises said ortho chlorinated aromatic compound and a mixture of aromatic hydrocarbons.
Claim 4
Dependent Claim
24 words
The process of claim 1 wherein said feed stream comprises said otho chlorinated aromatic compound and a mixture of benzene and chlorinated aromatic hydrocarbons.
Claim 5
Dependent Claim
24 words
The process of claim 1 wherein said feed stream comprises said ortho chlorinated aromatic compound and a mixture of toluene and chlorinated aromatic hydrocarbons.
Claim 6
Dependent Claim
22 words
The process of claim 1 wherein said desorbent is selected from the group consisting of toluene, benzene, chlorotoluene, dichlorobenzene, ethyltoluene, and chlorobenzene.
Claim 7
Dependent Claim
10 words
The process of claim 4 wherein said desorbent is toluene.
References Cited (Backward Citations)
US4482776A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |