Catalytic dewaxing of hydrocarbon oils

• US 4,229,282 A
• Filed: 04/27/1979
• Issued: 10/21/1980
• Est. Priority Date: 04/27/1979
• Status: Expired due to Term

• Current Assignee: Mobil Oil Corporation (Exxon Mobil Corporation)
• Original Assignee: Mobil Oil Corporation (Exxon Mobil Corporation)
• Inventors: Peters, Alan W., Bowes, Emmerson, Stein, Thomas R.
• Primary Examiner(s): Gantz, Delbert E.
• Assistant Examiner(s): Schmitkons, G. E.
• Application Number:
  US06/033,775
• Time in Patent Office: 543 Days
• Field of Search: 208/111, 208/18, 208/120
• US Class Current: 208/111.3
• CPC Class Codes: B01J 29/48 containing arsenic, antimony, bismuth, vanadium, niobium tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
• CPC Class Codes: C10G 45/64 containing crystalline alumino-silicates, e.g. molecular sieves

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.

Claims

1. A process for dewaxing a hydrocarbon oil boiling above 350°

F. which comprises contacting said oil and H₂ gas at a temperature of about 450°

to 950°

F., a pressure of 50 to 3000 psig, a space velocity of 0.1 to 20 LHSV, and an H₂ 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.

2. The process claimed in claim 1 wherein said hydrogenation component consists of about 0.7 to about 7 wt.% nickel and about 2.1 to about 21 wt.% tungsten expressed as metal based on said catalyst, and said crystalline zeolite is ZSM-5.

3. The process described in claim 2 wherein said said crystalline zeolite is contained in an alumina matrix.

4. The process described in claim 3 wherein said crystalline zeolite is ZSM-5 having a crystallite size of less than about 0.05 microns.

5. The process described in claim 1 or claim 2 or claim 3 or claim 4 wherein said hydrocarbon oil is a petroleum distillate.

15. The process claimed in claim 2 wherein said hydrocarbon oil is a bright stock.

6. 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°

F. from a waxy stock boiling within the range of from about 450°

to about 1050°

F., said process comprising catalytically dewaxing said waxy stock to a pour point not greater than +25°

F., the improvement whereby dewaxed oil having good stability is formed, which comprises;

contacting said waxy stock and H₂ 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°

to about 750°

F., and an H₂ circulation rate of 500 to 20,000 SCF/bbl; and

recovering a dewaxed oil stock with a pour point not greater than +25°

F.

7. The process claimed in claim 6 wherein said hydrogenation component consists of about 0.7 to about 7 wt.% nickel and about 2.1 to about 21 wt.% tungsten expressed as metal based on said catalyst, and said crystalline zeolite is ZSM-5.

8. The process claimed in claim 6 wherein said hydrogenation component and said crystalline zeolite are contained in an alumina matrix.

9. The process claimed in claim 6 wherein said waxy stock is partially solvent dewaxed prior to said contacting step.

10. The process claimed in claim 7 wherein said waxy stock is partially solvent dewaxed prior to said contacting step.

11. The process claimed in claim 6 wherein said waxy stock is a waxy solvent-refined stock.

12. The process claimed in claim 7 wherein said waxy stock is a waxy solvent-refined stock.

13. The process claimed in claim 8 wherein said waxy stock is a waxy solvent-refined stock.

14. The process claimed in claim 10 wherein said waxy stock is solvent-refined prior to said dewaxing steps.

16. The process claimed in claim 7 wherein said hydrogenation component and said crystalline zeolite are contained in an alumina matrix.

17. The process claimed in claim 16 wherein said waxy stock is a waxy solvent-refined stock.