Isomerization of normal paraffins

Claim 1

A METHOD OF PREPARING AN ISOMERIZATION CATALYST RESISTANT TO SULFUR-AGING WHICH COMPRISES IMPREGNATING A PREDRIED SILICA-ALUMINA SUPPORT CONTAINING 70-90% SILICA, WITH 1-100% OF THE STOICHIOMETRIC AMOUNT OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF OXIDES, HYDROXIDES, AND NITRATES OF CHROMIUM AND BERYLLIUM REQUIRED TO REACT WITH THE HYDROXYL GROUPS IN THE SILICAALUMINA, HEATING THE IMPREGNATED SUPPORT TO A TEMPERATURE OF ABOUT 500*-1000*F. UNTIL REACTION WITH THE HYDROXYL GROUPS IN COMPLETE, AS EVIDENCED BY CESSATION OF EVOLUTION OF REACTION PRODUCTS, IMPREGNATING THE SUPPORT WITH A SOLUTION OF A PALLADIUM COMPOUND TO A PALLADIUM OF 0.3-0.8% WT., AND ACTIVATING THE CATALYST BY REDUCTION WITH HYDROGEN AT 750*-975*F.

Claim 2

A METHOD OF PREPARING AN ISOMERIZATION CATALYST RESISTANT TO SULFUR-AGING WHICH COMPRISES IMPREGNATING A PREDRIED SILICA-ALUMINA SUPPORT CONTAINING 70-90% SILICA, WITH 1-100% OF THE STOICHIOMETRIC AMOUNT OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF OXIDES, HYDROXIDES, AND NITRATES OF CHROMIUM AND BERYLLIUM REQUIRED TO REACT WITH THE HYDROXYL GROUPS IN THE SILICAALUMINA, HEATING THE IMPREGNATED SUPPORT TO A TEMPERATURE OF ABOUT 500*-1000*F. UNTIL REACTION WITH THE HYDROXYL GROUPS IN COMPLETE, AS EVIDENCED BY CESSATION OF EVOLUTION OF REACTION PRODUCTS, IMPREGNATING THE SUPPORT WITH A SOLUTION OF A PALLADIUM COMPOUND TO A PALLADIUM OF 0.3-0.8% WT., AND ACTIVATING THE CATALYST BY REDUCTION WITH HYDROGEN AT 750*-975*F.

Claim 3

A METHOD OF ISOMERIZING C5-C6 NORMAL PARAFFIN HYDROCARBONS WITHOUT SUBSTANTIAL DECLINE IN YIELD RESULTING FROM SULFUR COMPOUNDS IN THE FEED, WHICH COMPRISES PASSING HYDROGEN AND NORMAL C5-C6 PARAFFIN HYDROCARBON CONTAINING 0-10 P.P.M. SULFUR, AT A TEMPERATURE OF 700*790*F., SUFFICIENT TO EFFECT ISOMERIZATION, A PRESSURE OF 100-1000 P.S.I.G., AND A HYDROGEN/HYDROCARBON MOL RATIO OF ABOUT 0.5-5.0, OVER A CATALYST PREPARED BY IMPREGNATING A PREDRIED SILICA-ALUMINA SUPPORT, CONTAINING 70-90% SILICA, WITH 1-100% OF THE STOICHIOMETRIC AMOUNT OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF OXIDES, HYDROXIDES, AND NITRATES OF CHROMIUM AND BERYLLIUM REQUIRED TO REACT WITH THE HYDROXYL GROUPS IN THE SILICAALUMINA, HEATING THE IMPREGNATED SUPPORT TO 500*-1000* F. UNTIL REACTION WITH THE HYDROXYL GROUPS IS COMPLETE, AS EVIDENCED BY CESSATION OF EVOLUTION OF REACTION PRODUCTS, IMPREGNATING THE SUPPORT WITH A SOLUTION OF A PALLADIUM COMPOUND TO A PALLADIUM CONTENT OF 0.3-0.8% WT., AND ACTIVATING THE CATALYST BY REDUCTION WITH HYDROGEN AT 750*-975*F.

Claim 4

A METHOD OF ISOMERIZING C5-C6 NORMAL PARAFFIN HYDROCARBONS WITHOUT SUBSTANTIAL DECLINE IN YIELD RESULTING FROM SULFUR COMPOUNDS IN THE FEED, WHICH COMPRISES PASSING HYDROGEN AND NORMAL C5-C6 PARAFFIN HYDROCARBON CONTAINING 0-10 P.P.M. SULFUR, AT A TEMPERATURE OF 700*790*F., SUFFICIENT TO EFFECT ISOMERIZATION, A PRESSURE OF 100-1000 P.S.I.G., AND A HYDROGEN/HYDROCARBON MOL RATIO OF ABOUT 0.5-5.0, OVER A CATALYST PREPARED BY IMPREGNATING A PREDRIED SILICA-ALUMINA SUPPORT, CONTAINING 70-90% SILICA, WITH 1-100% OF THE STOICHIOMETRIC AMOUNT OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF OXIDES, HYDROXIDES, AND NITRATES OF CHROMIUM AND BERYLLIUM REQUIRED TO REACT WITH THE HYDROXYL GROUPS IN THE SILICAALUMINA, HEATING THE IMPREGNATED SUPPORT TO 500*-1000* F. UNTIL REACTION WITH THE HYDROXYL GROUPS IS COMPLETE, AS EVIDENCED BY CESSATION OF EVOLUTION OF REACTION PRODUCTS, IMPREGNATING THE SUPPORT WITH A SOLUTION OF A PALLADIUM COMPOUND TO A PALLADIUM CONTENT OF 0.3-0.8% WT., AND ACTIVATING THE CATALYST BY REDUCTION WITH HYDROGEN AT 750*-975*F.