Separation of isomers

Details Separation of isomers Separation of isomers

1975-03-19

1976-06-01

Adee, John

Gas separation

Means within gas stream for conducting concentrate to collector

55 67, 55 75, B01D 5304, B01D 1508

Patent

active

039605205

ABSTRACT:
A mixture of C.sub.8 aromatics, including para-xylene, meta-xylene orthoxylene and ethyl benzene, is separated by an adsorption/desorption procedure to provide rapid recovery of the valuable components. In this process, the aromatic mixture is passed through at least two adsorption zones in series, preferably containing zeolite ZSM-5 adsorbent, in which zones the meta-xylene and ortho-xylene pass through relatively uninhibited, whereas the para-xylene and ethyl benzene are adsorbed. The meta-xylene and ortho-xylene are removed and can be distilled to effect separation or can be separated as described in U.S. Pat. No. 3,656,278. According to this invention, the para-xylene and ethyl benzene in the zones are then desorbed in parallel, that is, introducing a desorbent separately to each zone and recovering desorbed aromatics separately from each.

REFERENCES:
patent: 3109722 (1963-11-01), Dow
patent: 3177631 (1965-04-01), Tamora
patent: 3699182 (1972-10-01), Cattanach
patent: 3724170 (1973-04-01), Allen et al.

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