Abstract:
A PROCESS IS DISCLOSED FOR UPGRADING CATALYTICALLY CRACKED GASOLINE WHICH INVOLVES FRACTIONATING A CATALYTICALLY CRACKED GASOLINE INTO A C6- OVERHEAD AND A C7+ BOTTOM FRACTION AND CONTACTING THE C7+ BOTTOM FRACTION WITH A ZSM-5 TYPE ZEOLITE. THE LIQUID PRODUCT OBTAINED FROM CONTACTING THE C7+ BOTTOM FRACTION WITH THE ZSM-5 TYPE ZEOLITE IS THEREAFTER BLENDED WITH THE ORIGINAL C6- FRACTION TO GIVE A FINAL GASOLINE OF INCREASED OCTANE NUMBER. THE REACTION CAN BE CARRIED OUT IN THE ABSENCE OF HYDROGEN AND IN THE ABSENCE OF A HYDROGENATION/DEHYDROGENATION COMPONENT ON THE ZEOLITES.
Abstract:
Straight-chain hydrocarbons and slightly branched-chain hydrocarbons are selectively converted in the liquid phase utilizing novel crystalline zeolites having unique molecular sieving properties. The catalyst preferably contains acidic cations and can also contain a component having a hydrogenation/dehydrogenation function. The process of this invention is particularly useful for the shape selective dewaxing of hydrocarbon oils including removal of high freezing point paraffins from jet fuel to lower freezing point, improving the octane rating of naphtha fractions, and lowering the pour point of high pour stocks, all with long catalyst life.
Abstract:
A two-step or combination process for preparing low pour point lube oils is set forth. The process involves subjecting a lube stock to a mild solvent dewaxing step, so as to obtain high quality waxes and a lube stock having an intermediate pour point; recovering the waxes and subjecting said intermediate pour point lube stock to a hydrowaxing step over a crystalline aluminosilicate of the ZSM-5 type to obtain a product having a pour point of 0* F and lower.