Catalytic dewaxing of hydrocarbon oils
AssigneeMobil Oil Corporation
InventorsAlan W. Peters, Emmerson Bowes, Thomas R. Stein
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Abstract
An improved process for catalytically dewaxing a hydrocarbon oil is disclosed. In this process the waxy oil is contacted in the presence of hydrogen with a dense zeolitic dewaxing catalyst associated with a nickel-tungsten hydrogenation component. The dewaxed oil has unexpectedly good stability and a low bromine number compared with prior-art processed oils. The process may be used to dewax crude oils, fuel oil fractions and lubricating oils.
Claims17
A process for dewaxing a hydrocarbon oil boiling above 350.degree. F. which comprises contacting said oil and H.sub.2 gas at a temperature of about 450.degree. to 950.degree. F., a pressure of 50 to 3000 psig, a space velocity of 0.1 to 20 LHSV, and an H.sub.2 circulation rate of 500 to 20,000 SCF/bbl, with a catalyst comprising a nickel-tungsten hydrogenation component and a crystalline zeolite having an effective pore diameter greater than 5 Angstroms and a crystal framework density, in the dry hydrogen form, of not less than about 1.6 grams per cubic centimeter.
In a process for manufacturing a refined lubricating oil stock having a V.I. of at least 85 and a pour point not greater than +25.degree. F. from a waxy stock boiling within the range of from about 450.degree. to about 1050.degree. F., said process comprising catalytically dewaxing said waxy stock to a pour point not greater than +25.degree. F., the improvement whereby dewaxed oil having good stability is formed, which comprises:
- contacting said waxy stock and H.sub.2 gas with a catalyst comprising a nickel-tungsten hydrogenation component and a crystalline zeolite having a silica to alumina ratio of at least 12 and a Constraint Index of 1 to 12, said contacting being at a LHSV of from 0.1 to 5.0, a temperature from about 500.degree. to about 750.degree. F., and an H.sub.2 circulation rate of 500 to 20,000 SCF/bbl;
- and recovering a dewaxed oil stock with a pour point not greater than +25.degree. F.
Dependencies are inferred from the claim text.