Method of treating a petroleum fraction using molecular sieve aluminosilicate selective adsorbents

Claim 1

A PETROLEUM TREATING PROCESS WHICH COMPRISES PRETREATING A BROAD BOILING SULFUR-CONTAINING PETROLEUM NAPHTHA HAVING LIGHT HYDROCARBON MATERIAL BOILING BELOW 100*F. AND END POINT IN THE RANGE OF 2 TO 475*F. TO REMOVE, LIGHT HYDROCARBON MATERIAL BOILING BELOW 100* F. AND TO REDUCE THE SULFUR CONTENT OF THE REFINING BROAD BOILING RANGE NAPHTHA, CATALYTICALLY REFORMING THE PRETREATED BROAD BOILING RANGE NAPHTHA, FRACTIONATING THE REFORMATE AND SEPARATING HYDROCARBON AND LIGHT HYDROCARBONS INCLUDING C1 TO C5 HYDROCARBONS THEREFROM, RECYCLING A PORTION OF SAID SEPARATED HYDROGEN AND LIGHT REFORMING STEP, FURTHER FRACTIONATING AND SEPARATING FROM THE REMAINING REFORMATE A LIGHT REFORMATE FRACTION HAVING A BOILING POINT NOT ABOVE ABOUT 250* F., AND A HEAVY REFORMATE FRACTION HAVING A BOILING POINT RANGE OF ABOUT 250 TO 450* F., CONTACTING SAID SEPARATED LIGHT REFORMATE FRACTTION WITH A 5 ANGSTROM UNIT ALUMINO-SILICATE MOLECULAR SIEVE ADSORBENT WHICH SELECTIVELY ADSORBS STRAIGH CHAIN HYDROCARBONS TO THE SUBSTANTIAL EXCLUSION OF NON-STRAIGHT CHAIN HYDROCARBONS TO ADSORB STAAIGHT CHAIN HYDROCARBONS THEREFROM, RECOVERING FROM SAID ADSORPTION OPERATION A TREATED LIGHT NAPHTHA FRACTION NOW SUBSTANTIALLY FREE OF STRAIGHT CHAIN HYDROCARBONS, BLENDING SAID TREATED LIGHT NAPHTHA FRACTION WITH SAID HEAVY REFORMATE TO YIELD A PRODUCT HAVING IMPROVED QUALITIES AS A MOTOR FUEL.