Hydrogenation catalysts

Inactive Publication Date: 2002-03-28
SUD CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014] It is another object of the invention to provide an improved hydrogenation catalyst for the conversion of aromatics in a feed stream, where the catalyst has high activity.
[0015] It is another object of the invention to provide an improved hydrogenation catalyst for the conversion of benzene to cyclohexane, where the catalyst has high activity and selectivity.
[0031] Because of the use of platinum and / or palladium chlorides in preparing the catalyst, the finished catalyst may also contain residual quantities of chlorides, from about 0.1 up to about 2 percent by weight. Surprisingly, the presence of chlorides in this range in the final catalyst may actually improve the overall performance of the catalyst.

Problems solved by technology

While hydrotreating and hydrocracking operations generally affect substantial partial hydrogenation of polynuclear aromatics, the resulting products still contain a relatively high percentage of monoaromatic hydrocarbons and a substantial amount of sulfur.
A significant problem that can occur with platinum and / or palladium catalysts is that they can be poisoned by sulfur compounds that may be present in the feed stream.
In addition, prior art noble metal catalysts are still susceptible to poisoning from sulfur and / or nitrogen present in conventional feed streams.
Because the specific surface area and crystal structure of theta and delta alumina are so similar, it is often difficult to distinguish between these two forms of alumina.
The presence of sulfur compounds in many of these feedstocks often complicates the hydrogenation process by poisoning the metal catalyst used for hydrogenation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0041] A conventional alumina carrier in extrusion was formed by mixing boehmite powder with water and, if needed, by adding a peptizing agent to improve its mechanical strength. The carrier was extruded into a conventional shape with a diameter of about {fraction (1 / 20)} in. The formed carrier was dried at a low temperature to evaporate water and then calcined with the temperature ramped to a final temperature of 1500 to 2500.degree. F. (816 to about 1371.degree. C.) and kept at the final temperature for 2-30 hours to produce a carrier comprised 96 percent theta alumina and 4 percent alpha alumina. Confirmation of the structure of the carrier was provided by x-ray diffraction. The carrier was then impregnated using an incipient wetness technique using a solution of hexachloroplatinic acid and palladium chloride of sufficient concentration to result in the platinum and palladium loadings referenced below. The catalyst carrier was left covered in the solution and allowed to soak for ...

example 2

[0044] The same procedure of Example 1 was followed except the steps of soaking and room temperature drying were omitted. The catalyst contained 0.19 percent platinum, 0.56 percent palladium, and 0.39 percent chloride by weight.

example 4

[0046] A larger pore carrier was prepared with the addition of a burn-out material which was calcined using the procedures of Example 1. It contained approximately 63 percent theta alumina and 37 percent alpha alumina. The impregnation and calcination procedures were the same as in Example 2. The catalyst contained 0.19 percent by weight platinum, 0.585 percent by weight palladium and 0.38 percent by weight chloride.

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Abstract

A hydrogenation catalyst which is sulfur tolerant and which includes from about 0.1 to about 1 percent platinum by weight and from 0.2 to about 2 percent by weight palladium on a predominantly theta alumina carrier. Also disclosed is a process for the manufacture and use of the hydrogenation catalyst.

Description

[0001] This is a divisional application of application Ser. No. 09 / 362,408, filed Jul. 28, 1999.BACKGROUND OF INVENTION[0002] The field to which this invention pertains is hydrogenation catalysts, and more particularly, sulfur tolerant, aromatic hydrogenation catalysts and a process for their use.DESCRIPTION OF THE RELATED ART[0003] There is today a significant need in the petroleum industry for non-aromatic solvents, including liquid hydrocarbons which boil in the range of about 200 to 1100.degree. F. Such products include, for example, aviation turbine fuel, diesel fuel, solvents, white oil, lube oil and the like. Products in this boiling range are conventionally produced by the hydrotreating and / or hydrocracking of various refinery feed streams, boiling in and above the desired product range. While hydrotreating and hydrocracking operations generally affect substantial partial hydrogenation of polynuclear aromatics, the resulting products still contain a relatively high percentag...

Claims

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Application Information

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IPC IPC(8): B01J23/44B01J32/00B01J35/10B01J27/13B01J37/18C07B61/00C07C5/10C07C13/18C10G45/40C10G45/52
CPCB01J23/44C10G45/52
InventorHUANG, DINAH C.FARIS, WILLIAM M.HOPKINS, P. DONALDJERUS, PAUL
OwnerSUD CHEM INC