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Methods of preparation of an olefin oligomerization catalyst

a technology of oligomerization catalyst and olefin, which is applied in the field of preparation of catalysts, can solve the problems of low product yield and lack of selectivity to a desired produ

Inactive Publication Date: 2007-02-22
CHEVRON PHILLIPS CHEMICAL CO LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0004] Disclosed herein is a method of making an olefin oligomerization catalyst, comprising contacting a chromium-containing compound, a...

Problems solved by technology

Olefin oligomerization catalysts are known in the art, but sometimes lack selectivity to a desired product and also have a low product yield.

Method used

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  • Methods of preparation of an olefin oligomerization catalyst
  • Methods of preparation of an olefin oligomerization catalyst
  • Methods of preparation of an olefin oligomerization catalyst

Examples

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example 1

[0180] Catalyst 1-8

[0181] Catalyst was prepared by adding 14.1 lbs of dry, nitrogen-purged toluene to a 5 gallon reactor. To the toluene was added 630.9 g chromium(III) 2-ethylhexanoate dissolved in 750 mL toluene followed by a 300 mL toluene rinse. 2,5-Dimethylpyrrole (388.9 mL) was added to the chromium solution in the reactor. The reactor was purged with nitrogen and brought to a temperature of 25° C. A mixture of 1,600 g neat triethylaluminum (TEA) and 1,229 g neat diethylaluminum chloride (DEAC) was then added to the reactor followed by 0.2 lbs of toluene rinse. The temperature increased 18° C. and was returned to 25° C. with cooling. The contents of the reactor stood overnight and were then filtered, using a filter comprising a combination of a metal screen, filter paper, glass wool, diatomaceous earth, and another layer of glass wool. Additional catalysts were prepared in which the temperature and chromium concentration of the catalyst preparations were varied. The catalysts ...

example 2

[0183] Catalyst 9-10

[0184] An ethylbenzene solution containing 2.3 g chromium(III) 2-ethylhexanoate and 8.13 g ethylbenzene was prepared. A separate solution containing 6.05 g neat triethylaluminum (TEA), 4.63 g neat diethylaluminum chloride (DEAC), 1.37 g 2,5-dimethylpyrrole and 22.6 g ethylbenzene was also prepared. These two solutions were added to 30.98 g of active catalyst over a 40 minute period such that the addition time for both solutions started and ended at the same time. The catalyst was tested in a 1 L continuous reactor and the average results of two test runs are shown in Table 2 as Catalyst 10. The average of two test runs of a standard catalyst preparation is shown in Table 2 as Catalyst 9.

TABLE 2Select-TotalivityPurityProductivityRx PolymerPolymerCatalyst(1-C6=)(1-C6=)(g 1-C6= / g Cr)(Lb / Hr 100 MM / yr Plant) 989.3%98.8%82,5750.0013.331089.1%98.7%82,9890.007.18

[0185] The examples show that an acceptable catalyst can be prepared. The examples further indicate that a ...

example 3

[0186] Catalyst 11

[0187] A solution was prepared by mixing 12.10 g neat triethylaluminum (TEA), 9.38 g neat diethylaluminum chloride (DEAC) and 20.02 g ethylbenzene. Two aliquots were added to this solution. The first contained 2.3 g chromium(III) 2-ethylhexanoate, 1.14 g ethylbenzene and 2.74 g 2,5-dimethylpyrrole. The second contained 2.3 g chromium(III) 2-ethylhexanoate and 1.14 g ethylbenzene. Ethylbenzene was added to obtain a total volume of 100 mL. The catalyst prepared by this method was tested in a 1 L continuous reactor. The average results of three test runs are shown in Table 3.

TABLE 3SelectivityPurityCatalyst ProductivityCatalyst(1-C6=)(1-C6= / C6)(g 1-C6= / g Cr)1191.2%99.2%80,759

[0188] The example shows high selectivity (91.2%), high purity (99.2%), and good catalyst productivity (80,759 g 1−C6= / g Cr) for the catalyst preparation.

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Abstract

A method of making an olefin oligomerization catalyst, comprising contacting a chromium-containing compound, a heteroatomic ligand, and a metal alkyl, wherein the chromium-containing compound comprises less than about 5 weight percent chromium oligomers. A method of making an olefin oligomerization catalyst comprising a chromium-containing compound, a nitrogen-containing compound, and a metal alkyl, the method comprising adding a composition comprising the chromium-containing compound to a composition comprising the metal alkyl. A method of making an olefin oligomerization catalyst comprising a chromium-containing compound, a nitrogen-containing compound, and a metal alkyl, the method comprising abating all or a portion of water, acidic protons, or both from a composition comprising the chromium-containing compound, a composition comprising the nitrogen-containing compound, or combinations thereof prior to or during the preparation of the catalyst. Methods of oligomerizing olefins by contacting such catalysts with an alpha olefin.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] The subject matter of the present application is related to U.S. patent application Ser. Nos. 10 / 783,737 and 10 / 783,429, both filed on Feb. 20, 2004 and entitled “Methods of Preparation of an Olefin Oligomerization Catalyst,” which are hereby incorporated herein by reference in its entirety for all purposes.FIELD OF THE INVENTION [0002] The present invention relates to preparation of catalysts for use in a process for producing an olefin oligomer. More particularly, the present invention relates to preparing oligomerization catalysts comprising a chromium-containing compound, a nitrogen-containing compound, a metal alkyl, and an optional halide-containing compound for use in a process for producing an alpha-olefin oligomer comprising 1-hexene or 1-octene from ethylene. BACKGROUND OF THE INVENTION [0003] Olefin oligomerization catalysts are known in the art, but sometimes lack selectivity to a desired product and also have a low product ...

Claims

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Application Information

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IPC IPC(8): C08F4/24
CPCB01J31/04B01J31/128B01J31/143B01J31/18B01J31/181B01J31/2226B01J31/4092B01J2231/20B01J2531/62C07C2/32C07C2527/125C07C2531/22C08F10/00C08F4/69Y02P20/584
Inventor KNUDSEN, RONALD D.ABBOTT, RONALD G.KREISCHER, BRUCE E.BARALT, EDUARDO J.SMALL, BROOKE L.
Owner CHEVRON PHILLIPS CHEMICAL CO LP
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