Desorption of molecular sieves by

Claim 1

A PROCESS FOR THE SEPARATION OF MIXTURES CONSISTING ESSENTIALLY OF STRAIGHT-CHAIN UNSATURATED HYDROCARBONS AND AT LEAST ONE HYDROCARBON FROM THE GROUP CONSISTING OF BRANCHED-CHAIN AND CYCLIC HYDROCARBONS, SAID PROCESS CONSISTING ESSENTIALLY OF CONTACTING SAID MIXTURE WITH A MOLECULAR SIEVE HAVING PORE DIAMETERS OF 4 TO 5 ANGSTROMS, A PORTION OF THE IONS OF SAID MOLECULAR SIEVE HAVING BEEN REPLACED BY ION-EXCHANGE WITH A METAL SELECTED FROM GROUP VIII OF THE PERIODIC TABLE, THE AMOUNT OF SAID METAL BEING 0.05 TO 20 PERCENT BY WEIGHT OF SAID MOLECULAR SIEVE, SAID CONTACTING BEING UNDER CONDITIONS SUCH THAT THE UNSATURATED HYDROCARBONS ARE SELECTIVELY ADSORBED BY SAID MOLECULAR SIEVE, CEASING CONTACT OF SAID MIXTURE WITH SAID MOLECULAR SIEVE AND THEREAFTER PASSING A GAS CONSISTING ESSENTIALLY OF HYDROGEN OVER SAID MOLECULAR SIEVE CONTAINING ADSORBED UNSATURATED STRAIGHTCHAIN HYDROCARBONS UNDER TEMPERATURE AND PRESSURE CONDITIONS SUFFICIENT TO CAUSE HYDROGENATION OF ADSROBED UNSATURATED STRAIGHT-CHAIN HYDROCARBONS, CAUSING THE ADSORBED UNSATURATED STRAIGHT-CHAIN HYDROCARBON TO BE HYDROGENATED, THEREBY FACILITATING DESOPRTION OF SAID ADSORBED STRAIGHT-CHAIN UNSATURATED HYDROCARBONS.