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Hydroisomerization processes using pre-sulfided catalysts

Inactive Publication Date: 2005-06-30
CHEVROU USA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] Embodiments of the present invention are directed toward methods for producing high yields of lubricant base oil from a waxy hydrocarbon feed. In one embodiment, the method comprises pre-sulfiding a shape selective, intermediate pore size, noble metal-containing molecular sieve catalyst t

Problems solved by technology

Many refining processes tend to produce large quantities of lighter grade products at the expense of producing lubricant base oil products.

Method used

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Examples

Experimental program
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Effect test

example 1

Hydroisomerization Using a Sulfided SAPO Catalyst at 1,000 psig

[0085] This example illustrates the effect of sulfiding a SAPO-11 catalyst. In FIG. 1, the 650° F.+yield (weight percent) obtained when a Fischer-Tropsch derived wax was hydroisomerized is plotted as a function of pour point (° C.) for three situations: 1) when the SAPO 11 catalyst is not sulfided prior to the hydroisomerization reaction, 2) when the catalyst was pre-sulfided, and 3) when the catalyst was re-sulfided after being on-stream for 2040 hours. Each of the three experiments was conducted at a hydrogen partial pressure of 1,000 psig.

[0086] For comparative purposes, data points at a pour point of about −15° C. may be considered. The 650° F.+yield for the un-sulfided catalyst was about 32 weight percent, which increased to a yield of about 50 weight percent when the catalyst was pre-sulfided, representing an increase of about 18 weight percent. After re-sulfiding the catalyst, the yield increased an additional 1...

example 2

Hydroisomerization Using a Sulfided SAPO Catalyst at Varying Pressures

[0088] The effects of sulfiding at two different pressures (and the effects of pressure without sulfiding), are shown in FIGS. 3 and 4. The 1,000 psig curves in FIGS. 3 and 4 are the same as those in FIGS. 1 and 2; in other words, the 1,000 psig data has simply been re-plotted. Decreasing the hydrogen partial pressure from 1,000 to 300 psig during hydroisomerization results in a 650° F.+yield increase from about 35 to 68 weight percent, and an increase in viscosity index of about 155 to 168. Thus, this example shows that hydroisomerization yield and viscosity index are both enhanced as the hydroisomerization pressure is decreased.

[0089] Additionally, comparing FIGS. 1 and 2 with FIGS. 3 and 4 illustrate that sulfiding a SAPO-11 had a larger beneficial effect at higher pressures (e.g., 1,000 psig) than at lower pressures (e.g., 300 psig). Sulfiding the SAPO-11 catalyst had a modest effect on 650° F.+yield at 300 ...

example 3

Hydroisomerization Using a Sulfided Zeolite Catalyst

[0090] This example was conducted as described for Example 1, but using SSZ-32 as the catalyst. FIG. 5 shows that the 650° F.+yield (weight percent) from Fischer-Tropsch wax hydroisomerized at 1,000 psig for both sulfided and un-sulfided SSZ-32 catalysts. The yield was about 55 (at a pour point of −15° C.). Likewise, the viscosity index was about 175.

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Abstract

The present application relates to methods for producing a lubricant base oil from a waxy hydrocarbon feed using a pre-sulfided shape selective, intermediate pore size, noble metal-containing molecular sieve catalyst. According to the present invention, a shape selective, intermediate pore size, noble metal-containing molecular sieve catalyst is pre-sulfided to provide a sulfided catalyst, wherein the molar ratio of sulfur to noble metal in the sulfided catalyst is greater than one, and a waxy hydrocarbon feed is hydroisomerized by contacting the waxy hydrocarbon feed with the sulfided catalyst at hydroisomerization conditions, to produce a lubricant base oil.

Description

REFERENCE TO RELATED APPLICATIONS [0001] The present application is related to and hereby incorporates by reference in its entirety U.S. patent application Ser. No. ______ (Docket No. 005950-827), entitled “Hydroisomerization Processes Using Re-Sulfided Catalysts,” which is filed herewith.FIELD OF THE INVENTION [0002] The present invention relates in general to the production of Fischer-Tropsch derived lubricant base oils. More specifically, the present invention is directed toward using pre-sulfided, shape selective, intermediate pore size, noble metal-containing molecular sieve catalysts to produce lubricant base oils, having high viscosity indexes and low pour points, in high yield. BACKGROUND OF THE INVENTION [0003] Refining operations that produce large quantities of high-quality lubricant base oils are desirable. The demand placed on refineries for producing the high-quality lubricant base oils in the operation of modern machinery and automobiles is increasing. Many refining p...

Claims

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Application Information

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IPC IPC(8): C10G45/64C10G73/38
CPCC10G2400/10C10G45/64
Inventor MILLER, STEPHEN J.
Owner CHEVROU USA INC
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