Catalytic dewaxing of light and heavy oils in dual parallel reactors

An integrated process for catalytically dewaxing relatively light petroleum chargestocks characterized by a 50% boiling point of less than about 850.degree. F. and a kinematic viscosity at 100.degree. 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.degree. F. and a kinematic viscosity at 100.degree. C. of greater than about 9 centistokes, in a second dewaxing reactor, comprising:

• contacting the relatively heavy petroleum chargestocks in the second 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 less than about 3, which sorption is determined at a P/P.sub.o of 0.1 and at a temperature of 50.degree. C. for n-hexane and 80.degree. 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.degree. 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 k.sub.3MP /k.sub.DMB determined at a temperature of 1000.degree. F. being less than about 2, and (3) a Constraint Index value of greater than about 1;
• simultaneously maintaining under regeneration conditions, in the first 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 greater than about 3, which sorption is determined at a P/P.sub.o of 0.1 and at a temperature of 50.degree. C. for n-hexane and 80.degree. C. for o-xylene, and (2) by the ability of selectively cracking 3-methylpentane (3MP) in preference to the doubly branched 2,3-dimthylbutane (DMB) at 1000.degree. 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 k.sub.3MP /k.sub.DMB determined at a temperature of 1000.degree. F. being in excess of 2;
• subsequently contacting said crystalline aluminosilicate zeolite in said first reactor with said relatively light petroleum chargestock;
• and
• hydrotreating the effluent from said first and second dewaxing reactors in a downstream hydrotreating reactor.

An integrated process for alternatively catalytically dewaxing relatively light petroleum chargestocks, characterized by a 50% boiling point of less than about 850.degree. F. and a kinematic viscosity at 100.degree. 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.degree. F. and a kinematic viscosity at 100.degree. 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/P.sub.o of 0.1 and at a temperature of 50.degree. C. for n-hexane and 80.degree. 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.degree. 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 k.sub.3MB /k.sub.DMB determined at a temperature of 1000.degree. F. being in excess of about 2;
• simultaneously providing, in the 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.sub.o of 0.1 and at a temperature of 50.degree. C. for n-hexane and 80.degree. 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.degree. F. and 1 atmosphere pressure from a 1/1/1 weight ratio mixture of n-hexane/3-methylpentane/2,3-dimethylbutane, with the ratio of rate constants k.sub.3MP /k.sub.DMB determined at a temperature of 1000.degree. F. being less than about 2, and (3) a Constraint Index value of greater than about 1;
• subsequently discontinuing said contacting step in said first reactor and 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.

An integrated process for alternatively catalytically dewaxing relatively light petroleum chargestocks characterized by a 50% boiling point of less than about 850.degree. F. and a kinematic viscosity of 100.degree. 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.degree. F. and a kinematic viscosity at 100.degree. C. of greater than about 9 centistokes, in a second dewaxing reactor, comprising:

• contacting the relatively heavy petroleum chargestocks in the second 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 less than about 3, which sorption is determined at a P/P.sub.o of 0.1 and at a temperature of 50.degree. C. for n-hexane and 80.degree. 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.degree. F. and 1 atmosphere pressure from 1/1/1 weight ratio mixture of n-hexane/3-methyl-pentane/2,3-dimethylbutane, with the ratio of rate constants k.sub.3MP /k.sub.DMB determined at a temperature of 1000.degree. F. being less than about 2, and (3) a Constraint Index value of greater than about 1;
• simultaneously providing, in the first 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 greater than about 3, which sorption is determined at a P/P.sub.o of 0.1 and at a temperature of 50.degree. C. for n-hexane and 80.degree. 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.degree. 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 k.sub.3MP /k.sub.DMB determined at a temperature of 1000.degree. F. being in excess of 2;
• subsequently discontinuing said contacting step in said reactor and contacting said crystalline aluminosilicate zeolite in said first reactor with said relatively light petroleum chargestock;
• and
• hydrotreating the effluent from said first and second dewaxing reactors in a downstream hydrotreating reactor.