A process of claim 1 wherein the crystalline aluminosilicate zeolite in the first dewaxing reactor is selected from the group consisting of natural and synthetic ferrierites, ZSM-22, ZSM-23, ZSM-35 zeolites and mixtures thereof.ģ. Hydrotreating the effluent from said first and second dewaxing reactors in a downstream hydrotreating reactor.Ģ. Subsequently contacting said crystalline aluminosilicate zeolite in said second reactor with said relatively heavy petroleum chargestock and being less than about 2, and (3) a Constraint Index value of greater than about 1 and 1 atmosphere pressure from a 1/1/1 weight ratio mixture of n-hexane/3-methyl-pentane/2,3-dimethylbutane, with the ratio of rate constants k 3MP /k DMB determined at a temperature of 1000° F. for o-xylene, (2) by the ability of selectively cracking 3-methylpentane (3MP) in preference to the doubly branched 2,3-dimethylbutane (DMB) at 1000° F. Simultaneously maintaining under regeneration conditions, in a second dewaxing reactor, a crystalline aluminosilicate zeolite having pore openings defined by (1) a ratio of sorption of n-hexane to o-xylene, on a volume percent basis, of less than about 3, which sorption is determined at a P/P o of 0.1 and at a temperature of 50° C.
for o-xylene, and (2) by the ability of selectively cracking 3-methylpentane (3MP) in preference to the doubly branched 2,3-dimethylbutane, (DMB) at 1000° F. of greater than about 9 centistokes, in a second dewaxing reactor, comprising:Ĭontacting the relatively light petroleum chargestocks in the first dewaxing reactor with a crystalline aluminosilicate zeolite having pore openings defined by (1) a ratio of sorption of n-hexane to o-xylene, on a volume percent basis, of greater than about 3, which sorption is determined at a P/P o of 0.1 and at a temperature of 50° C. of less than about 9 centistokes, in a first dewaxing reactor, and relatively heavy petroleum chargestocks, characterized by a 50% boiling point of greater than about 850° F. An integrated process for catalytically dewaxing relatively light petroleum chargestocks, characterized by a 50% boiling point of less than about 850° F. Production of high viscosity index lubricating oil stockĬatalytic process for manufacture of lubricating oilsġ. Preparation of natural ferrierite hydrocracking catalyst and hydrocarbon conversion with catalyst Two-stage hydrocarbon dewaxing hydrotreating processĬascade catalytic dewaxing/hydrodewaxing process
Highly siliceous porous crystalline material ZSM-22 and its use in catalytic dewaxing of petroleum stocks Catalytic process for manufacture of low pour lubricating oils
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