초록 ▼

Relatively heavy or relatively light lube chargestocks are dewaxed in two parallel, separate reactors. The reactor used for dewaxing the relatively light chargestocks contains a crystalline aluminosilicate zeolite exemplified natural or synthetic ferrierite, ZSM-22, ZSM-23 and ZSM-35 zeolites and/or

Relatively heavy or relatively light lube chargestocks are dewaxed in two parallel, separate reactors. The reactor used for dewaxing the relatively light chargestocks contains a crystalline aluminosilicate zeolite exemplified natural or synthetic ferrierite, ZSM-22, ZSM-23 and ZSM-35 zeolites and/or mixtures thereof. The reactor used for dewaxing the relatively heavy chargestocks contains a crystalline aluminosilicate zeolite exemplified by ZSM-5, ZSM-11 zeolites, ZSM-5/ZSM-11 intermediates and/or mixtures thereof.

대표청구항 ▼

An integrated process for catalytically dewaxing relatively light petroleum chargestocks, characterized by a 50% boiling point of less than about 850°F. and a kinematic viscosity at 100°C. of less than about 9 centistokes, in a first dewaxing reactor, and relatively heavy petroleum chargestocks, cha

An integrated process for catalytically dewaxing relatively light petroleum chargestocks, characterized by a 50% boiling point of less than about 850°F. and a kinematic viscosity at 100°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. and a kinematic viscosity at 100°C. of greater than about 9 centistokes, in a second dewaxing reactor, comprising: contacting 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/Po of 0.1 and at a temperature of 50°C. for n-hexane and 80°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. 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 k3MP/kDMB determined at a temperature of 1000°F. being in excess of about 2; 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/Po of 0.1 and at a temperature of 50°C. for n-hexane and 80°C. 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. 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 k3MP/kDMB determined at a temperature of 1000°F. being less than about 2, and (3) a Constraint Index value of greater than about 1; subsequently contacting said crystalline aluminosilicate zeolite in said second reactor with said relatively heavy petroleum chargestock; and hydrotreating the effluent from said first and second dewaxing reactors in a downstream hydrotreating reactor.