Liquid purification or separation – Processes – Chromatography
Patent
1989-04-17
1990-07-10
Therkorn, Ernest G.
Liquid purification or separation
Processes
Chromatography
210674, 2101982, 208310Z, 585828, B01D 1508
Patent
active
049405489
ABSTRACT:
A process for separating 3,5-diethyltoluene (3,5-DET) and/or 2,6-diethyltoluene (2,6-DET) from a feed mixture comprising at least one isomer from the group 3,5- and 2,6-diethyltoluene and at least one other isomer thereof, which process comprises contacting the mixture at adsorption conditions with an adsorbent comprising an X zeolite, cation exchanged with a mixture of barium and potassium or sodium, lithium, barium or copper cations or mixtures thereof or a Y zeolite cation exchanged with barium, calcium, sodium, potassium or copper cations or mixtures thereof, thereby selectively adsorbing one or more of said isomers and removing one or more relatively non-adsorbed isomer(s) from contact with the adsorbent. 2,6-diethyltoluene is the most strongly adsorbed isomer with certain adsorbents and is recovered by desorption at desorption conditions with a desorbent material comprising a monocyclic alkyl-substituted aromatic hydrocarbon, e.g., p-diethylbenzene, m-diethylbenzene, p-xylene or p-toluene and optionally, a diluent, e.g., a straight chain or branched paraffin, e.g., n-heptane or iso-octane, an ether or a halogenated hydrocarbon. With certain adsorbents 3,5-DET is the least strongly adsorbed isomer and can be recovered in the raffinate. Certain of the adsorbent-cation combinations perform the dual function of strongly adsorbing 2,6-DET and least strongly adsorbing 3,5-DET.
REFERENCES:
patent: 2985589 (1961-05-01), Broughton et al.
patent: 3040777 (1962-06-01), Carson et al.
patent: 3422848 (1969-01-01), Liebman et al.
patent: 3699182 (1972-10-01), Cattanach
patent: 3706812 (1972-12-01), De Rosset et al.
patent: 3723302 (1973-03-01), Pharis et al.
patent: 3864416 (1975-02-01), Campbell
patent: 3878129 (1975-04-01), Rosback
patent: 3894109 (1975-07-01), Rosback
patent: 3943184 (1976-03-01), Rosback
patent: 4051192 (1977-09-01), Neuzil
patent: 4159284 (1979-06-01), Seko et al.
patent: 4213913 (1980-07-01), De Rosset
patent: 4313015 (1982-01-01), Broughton
patent: 4402832 (1983-09-01), Gerhold
patent: 4423279 (1983-12-01), Kulprathipanja
patent: 4467126 (1984-08-01), Zinnen
patent: 4482777 (1984-11-01), Neuzil
patent: 4584424 (1986-04-01), Barthomeuf
patent: 4642397 (1987-02-01), Zinnen et al.
patent: 4717778 (1988-01-01), Zinnen
Hall Jack H.
McBride Thomas K.
Spears Jr. John F.
Therkorn Ernest G.
UOP
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