Cracking/dewaxing
AssigneeMobil Oil Corporation
InventorsClarence D. Chang, David S. Shihabi, Paul B. Weisz
Life of this patent
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Abstract
A process is provided for converting feedstock comprising hydrocarbon compounds to product comprising hydrocarbon compounds of lower molecular weight than feedstock hydrocarbon compounds over a catalyst comprising a siliceous zeolite prepared by the method comprising providing zeolite Beta containing boron and aluminum, treating the zeolite with silicon tetrachloride at a temperature and for a time sufficient to replace boron with silicon, and recovering the siliceous zeolite having reduced boron content but substantially preserved initial aluminum content. In particular embodiments, the conversion is selective cracking for waxes and the process is useful for reducing the pour point of fuel oils and lubricants.
Claims16
A process for cracking a feedstock comprising hydrocarbon compounds to lower molecular weight hydrocarbon compounds, which process comprises contacting said feedstock at conversion conditions with a catalyst composition comprising a siliceous zeolite prepared by the method comprising providing a boron-containing zeolie Beta with initial boron and aluminum contents each greater than the numeral 0, treating the zeolite with silicon tetrachloride at a temperature for for a time sufficient to replace boron with silicon, and recovering the siliceous zeolite having reduced boron content but substantially preserved initial aluminum content.
A process for calaytically dewaxing a hydrocarbon oil feed to provide a catalytically dewaxed oil with reduced pour point, which process comprises contacting said feed at a temperature of from about 230.degree. C. to about 500.degree. C., a pressure of from about 10 kPa to about 20,300 kPa and a liquid hourly space velocity of from about 0.5 hr.sup.-1 to about 100 hr.sup.-1 with a catalyst composition comprising a siliceous zeolite prepared by the method comprising providing a boron-containing zeolite Beta with initial boron and aluminum contents each greater than the numeral 0, treating the zeolite with silicon tetrachloride at a temperature and for a time sufficient to replace boron with silicon, and recovering the siliceous zeolite having reduced boron content but substantially preserved initial aluminum content.
A process for catalytically dewaxing a lubricating oil base stock to provide a lubricating oil with reduced pour point, which process comprises contacting said base stock at a temperature of from about 230.degree. C. to about 500.degree. C., a pressure of from about 10 kPa to about 20,300 kPa and a liquid hourly space velocity of from about 0.5 hr.sup.-1 to about 100 hr.sup.-1 and a hydrogen/oil mole ratio of 0 to about 100 with a catalyst position comprising a siliceous zeolite prepared by the method comprising providing a boron-containing zeolite Beta with initial boron and aluminum contents each greater than the numeral 0, treating the zeolite with silicon tetrachloride at a temperature and for a time sufficient to replace boron with silicon, and recovering the siliceous zeolite having reduced boron content but substantially preserved initial aluminum content.
Dependencies are inferred from the claim text.