Patent US4480129A successfully refreshed from Google Patents.
US4480129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for separating isomers of toluidine
Assignee: Honeywell UOP LLC
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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 14:55
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.
References Cited (Backward Citations)
US2985589A
Cited
US3114782A
Cited
US3069470A
Cited
US3201491A
Cited
US3265750A
Cited
US3510423A
Cited
US3558730A
Cited
US3626020A
Cited
US3558732A
Cited
US3668267A
Cited
US3663638A
Cited
US3734974A
Cited
US3864416A
Cited
US4371721A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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