A pressure swing adsorption process to separate para-xylene and ethylbenzene from C.sub.8 aromatics which uses a para-selective, non-acidic, medium pore molecular sieve of the MFI structure type and is operated isothermally in the vapor phase at elevated temperatures and pressures is integrated with crystallization to produce para-xylene product. A fixed bed of adsorbent is saturated with pX and EB, which are preferentially adsorbed, the feed is stopped, and lowering the partial pressure desorbs the pX and EB. The process effluent, which is rich in pX and EB, is crystallized to obtain para-xylene product.

Un proceso de la adsorción del oscilación de la presión para separar el para-xylene y el ethylbenzene de los compuestos aromáticos C.sub.8 que utiliza un tamiz molecular del poro pa'rrafo-selectivo, no-a'cido, medio del tipo de la estructura de MFI y se funciona isothermally en la fase del vapor en las temperaturas y las presiones elevadas se integra con la cristalización para producir el producto del para-xylene. Una cama fija del adsorbente se satura con el pX y se para el EB, que se fijan por adsorcio'n preferencial, la alimentación, y bajando la presión parcial desorbs el pX y el EB. El efluente de proceso, que es rico en pX y el EB, se cristaliza para obtener el producto del para-xylene.

 
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