Process for the separation of para-xylene
An absorptive-separation process for the separation of para-xylene from a hydrocarbon feed is described comprising a mixture of C/sub 8/ aromatic isomers. The process comprises the steps of: (a) contacting the hydrocarbon feed, at less than equilibrium adsorption conditions and in the simultaneous presence of a specified desorbent with a bed of crystalline aluminosilicate absorbent, which is effective for selectively adsorbing a C/sub 8/ aromatic isomer from a mixture of at least two C/sub 8/ aromatic isomers, thereby adsorbing a selectively adsorbed component of the feed within the adsorbent, the adsorbent having been subjected prior to step (a) to at least one cycle of steps (a) to (d) herein. The less than equilibrium adsorption conditions are further characterized in allowing a competitive adsorption between the desorbent and the selectively adsorbed feed component for the adsorptive sites of the adsorbent whereby desorbent remains within the adsorbent for the duration of this step (a); (b) withdrawing from the bed of adsorbent a raffinate stream comprising desorbent and less selectively adsorbed components of the feed; (c) contacting the adsorbent bed with the desorbent at the desorption conditions to effect displacing the selectively adsorbed component of the feed from the adsorbent; and (d) withdrawing from the adsorbent bed an extract stream comprising desorbent and the selectively adsorbed component of the feed. The improvement uses water as the desorbent.
- Assignee:
- Mobil Oil Corp., New York, NY
- Patent Number(s):
- US 4705909
- OSTI ID:
- 5676259
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
ADSORBENTS
ADSORPTION
ALKYLATED AROMATICS
ALUMINIUM COMPOUNDS
ALUMINIUM SILICATES
AROMATICS
DESORPTION
HYDROCARBONS
HYDROGEN COMPOUNDS
ISOMERS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PRODUCTION
SEPARATION PROCESSES
SILICATES
SILICON COMPOUNDS
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
WATER
XYLENE-PARA
XYLENES