Method for separation of organic mixtures

Claim 1

A PROCESS FOR UPGRADING PETROLEUM NAPHTHA COMPRISING N-PARAFFINIC HYDROCARBONS AND ISOPARAFFINIC HYDROCARBONS AND AROMATIC HYDROCARBONS WHICH COMPRISES CONTACTING SAID NAPHTHA IN THE LIQUID PHASE WITH A SOLID MOLECULAR SIEVE ALUMINO-SILICATE SELECTIVE ADSORBENT MADE UP OF POROUS CRYSTALS WHEREIN THE PORES OF THE CRSYTALS ARE OF UNIFORM SIZE AND HAVE A PORE SIZE OF ABOUT 5.0 ANGSTROM UNITS, A PORE SIZE SUFFICIENT TO ADMIT STRAIGHT CHAIN HYDROCARBONS TO THE SUBSTANTIAL EXCLUSION OF NON-STRAIGHT CHAIN HYDROCARBONS, AND WHICH SELECTIVELY ADSORBS STRAIGHT CHAIN HYDROCARBONS WITHIN THE PORES OF THE ADSORBENT TO THE SUBSTANTIAL EXCLUSION OF NON-STRAIGHT CHAIN HYDROCARBONS AND WHICH SELECTIVELY ADSORBS AROMATIC HYDROCARBONS ON THE SURFACE OF SAID ADSORBENT TO REMOVE SAID N-PARAFFINIC HYDROCARBONS AND SAID AROMATIC HYDROCARBONS FROM SAID NAPHTHA, SEPARATING THE UNADSORBED ISOPARAFFINIC HYDROCARBONS FROM THE RESULTING ADMIXTURE, SEPARATELY SELECTIVELY DESORBING THE SURFACE ADSORBED AROMATIC HYDROCARDONS BY CONTACTING SAID ADSORBENT WITH A DESORBING FLUID SELECTED FROM THE GROUP CONSISTING OF A LIQUID MORE POLAR THAN SAID SURFACE ADSORBED AROMATIC HYDROCARBONS WHICH IS PREFERENTIALLY ADSORBED BY SAID ADSORBENT OVER SAID SURFACE ADSORBED AROMATIC HYDROCARBONS AND A FLUID AT A TEMPERATURE AT ABOUT THE BOILING POINT OF THE SURFACE ADSORBED AROMATIC HYDROCARBONS, RECOVERING THE RESULTING SELECTIVE ADSORBENT MATERIAL HAVING A SUBSTANTIALLY REDUCED AMOUNT OF AROMATIC HYDROCARBONS ADSORBED ON THE SURFACE THEREOF AND THEREAFTER SEPARATELY DESORBING THE PORE ADSORBED N-PARAFFINIC HYDROCARBONS THEREFROM.