Abstract: A process for simultaneously hydrotreating and dewaxing petroleum fractions is described. The process utilizes a single catalyst system which includes a hydrotreating component impregnated on a controlled pore size base and at least two catalyst components selected from any of an intermediate pore zeolite, a large pore zeolite or Zeolite Beta, and a large pore non-zeolite catalyst.

Abstract: An improved regeneration procedure is described for restoring the hydrogen chemisorption of aged platinum containing zeolite catalyst compositions. The process includes subjecting th catalyst to reactivation, followed by oxygen regeneration. After regeneration, in accordance with the invention, a platinum containing zeolite catalyst composition has a platinum dispersion, illustrated by H.sub.2 chemisorption, equivalent to fresh catalyst.

Abstract: An upgrading process for paraffinic naphthas subjects a full range naphtha to hydrocracking over a zeolite beta hydrocracking catalyst to effect a selective, partial hydrocracking in which the higher molecular weight n-paraffinic components of the naphtha are hydrocracked preferentially to the lower molecular weight components with concurrent isomerization of n-paraffins to isoparaffins, to form a hydrocracked effluent which comprises isobutane, C.sub.5 to C.sub.7 paraffins and relatively higher boiling naphthenes and paraffins. The hydrocracked effluent is split to remove the isobutane and the C.sub.5 and C.sub.7 paraffins with the balance of the higher boiling components being used as a reformer feed. Removal of the C.sub.5 and C.sub.7 paraffins permits improved reformer operation with the production of a higher octane product. The isomerization of the paraffins which occurs in the hydrocracking step provides a C.sub.5 to C.sub.

Abstract: A hydrocracking process for feedstocks containing high boiling, waxy components uses a number of sequential beds of hydrocracking catalyst based on zeolite beta. The proportion of zeolite beta in the catalyst increases in sequence so that the final bed has the highest zeolite concentration. The dewaxing activity of the zeolite beta-containing catalysts is enhanced by the use of sequential beds in this manner. The pour point of the high boiling fraction is reduced, as well as that of the distillate product, permitting part of the high boiling fraction to be included in the distillate product, thereby increasing the useful distillate yield.

Abstract: Long on-stream periods of low pressure, vapor phase isomerization of xylenes is achieved in a system having tolerance of ethyl benzene in the charge by using a zeolite catalyst such as zeolite ZSM-5 at partial pressure of eight carbon atom aromatics below 100 pounds per square inch and temperature of 500.degree. F. to 800.degree. F.