US4480129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for separating isomers of toluidine
Assignee: Honeywell UOP LLC
•
Filing: 1983-09-29
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Granted: 1984-10-30
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Expires: 2003-09-29
Abstract
Abstract This invention comprises a process for separating p-toluidine from a feed mixture comprising p-toluidine and o- or m-toluidine, which process comprises contacting the mixture at adsorption conditions with an adsorbent comprising an X or Y-type zeolite cation exchanged with a cation in the group Fe, Mn, Co, Ni or Zn, thereby selectively adsorbing the p-toluidine. The remainder of the feed mixture is removed from the adsorbent and the p-toluidine is recovered by desorption at desorption conditions with a desorbent material comprising aniline or an alkyl amine excluding alkyl amines having eight or more carbon atoms per molecule when the adsorbent comprises an X-type zeolite.
Inventors
- 👤 James W. Priegnitz
- 👤 Hermann A. Zinnen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:12
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/82; C07C209/86
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
152 words
A process for separating p-toluidine by adsorption of said p-toluidine in the pores of a hereinafter characterized X or Y-type zeolite from a feed mixture comprising p-toluidine and o-toluidine or m-toluidine said process comprising contacting said mixture with an adsorbent comprising an X or Y-type zeolite having cations exchanged with a cation selected from the group consisting of Fe, Mn, Co, Ni and Zn at conditions of from about 20° C. to about 200° C. and a pressure sufficient to maintain said liquid phase to selectively adsorb said p-toluidine while said o-toluidine or m-toluidine are removed from said adsorbent, and thereafter contacting said X or Y-type zeolite containing said p-toluidine with a desorbent, at desorption conditions, to remove said adsorbed p-toluidine derived from said feed mixture, said desorbent material comprising aniline or an alkyl amine, excluding alkylamines having eight or more carbon atoms per molecule when said adsorbent comprises an X-type zeolite.
Claim 2
Dependent Claim
152 words
A process for separating p-toluidine by adsorption of said p-toluidine in the pores of a hereinafter characterized X or Y-type zeolite from a feed mixture comprising p-toluidine and o-toluidine or m-toluidine said process comprising contacting said mixture with an adsorbent comprising an X or Y-type zeolite having cations exchanged with a cation selected from the group consisting of Fe, Mn, Co, Ni and Zn at conditions of from about 20° C. to about 200° C. and a pressure sufficient to maintain said liquid phase to selectively adsorb said p-toluidine while said o-toluidine or m-toluidine are removed from said adsorbent, and thereafter contacting said X or Y-type zeolite containing said p-toluidine with a desorbent, at desorption conditions, to remove said adsorbed p-toluidine derived from said feed mixture, said desorbent material comprising aniline or an alkyl amine, excluding alkylamines having eight or more carbon atoms per molecule when said adsorbent comprises an X-type zeolite.
Claim 3
Dependent Claim
28 words
The process of claim 1 wherein the boiling range of said desorbent material is at least about 5° C. higher or lower than that of the feed mixture.
Claim 4
Dependent Claim
32 words
The process of claim 1 wherein said desorption conditions include a temperature within the range of from about 20° C. to about 200° C. and a pressure sufficient to maintain liquid phase.
Claim 5
Dependent Claim
17 words
The process of claim 1 wherein said process is effected with a simulated moving bed flow system.
Claim 6
Dependent Claim
15 words
The process of claim 1 wherein said process is effected with a static bed system.
Claim 7
Dependent Claim
151 words
A process for separating p-toluidine by adsorption of said p-toluidine in the pores of a hereinafter characterized X or Y-type zeolite from a feed mixture comprising p-toluidine o-toluidine and m-toluidine said process comprising contacting said mixture with an adsorbent comprising an X or Y-type zeolite having cations exchanged with a cation selected from the group consisting of Fe, Mn, Co, Ni and Zn at conditions of from about 20° C. to about 200° C. and a pressure sufficient to maintain said liquid phase to selectively adsorb said p-toluidine while said o-toluidine and m-toluidine are removed from said adsorbent, and thereafter contacting said X or Y-type zeolite containing said p-toluidine with a desorbent, at desorption conditions, to remove said adsorbed p-toluidine derived from said feed mixture, said desorbent material containing aniline or an alkyl amine excluding alkylamines having eight or more carbon atoms per molecule when said adsorbent comprises an X-type zeolite.
Claim 8
Dependent Claim
151 words
A process for separating p-toluidine by adsorption of said p-toluidine in the pores of a hereinafter characterized X or Y-type zeolite from a feed mixture comprising p-toluidine o-toluidine and m-toluidine said process comprising contacting said mixture with an adsorbent comprising an X or Y-type zeolite having cations exchanged with a cation selected from the group consisting of Fe, Mn, Co, Ni and Zn at conditions of from about 20° C. to about 200° C. and a pressure sufficient to maintain said liquid phase to selectively adsorb said p-toluidine while said o-toluidine and m-toluidine are removed from said adsorbent, and thereafter contacting said X or Y-type zeolite containing said p-toluidine with a desorbent, at desorption conditions, to remove said adsorbed p-toluidine derived from said feed mixture, said desorbent material containing aniline or an alkyl amine excluding alkylamines having eight or more carbon atoms per molecule when said adsorbent comprises an X-type zeolite.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1987-10-30 | 1988-04-30 | 1988-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-30 | 1992-04-30 | 1992-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-30 | 1996-04-30 | 1996-10-30 | $7700.00 | Window Closed / Lapsed |