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Method to extend the utilization of a catalyst in a multistage reactor system

A technology for reactors and catalysts, which is applied in the field of expanding the utilization rate of catalysts in multi-stage reactor systems, and can solve the problems of unrealized catalyst service life and negative impact on process economics, etc.

Inactive Publication Date: 2007-09-05
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the rate of secondary reactions (e.g. hydrodesulfurization) is faster than the rate of primary reactions (e.g. hydrogenation), the full catalyst lifetime is not achieved and process economics are negatively affected

Method used

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  • Method to extend the utilization of a catalyst in a multistage reactor system
  • Method to extend the utilization of a catalyst in a multistage reactor system
  • Method to extend the utilization of a catalyst in a multistage reactor system

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Test-36 was carried out in a single reactor filled with 250mm catalyst at multiple temperatures (80°C, 100°C, and 120°C, but mainly at 100°C), 2860kPa, 0.8l / h LHSV, H2: The PDO flow ratio is 6.1scc / g. The feed had 16 ppm sulfur and the test continued until the catalyst was significantly deactivated. At the end of the test, the catalyst was taken out in stages and analyzed for its sulfur content.

[0080] Figure 2 shows the sulfur distribution in the reactor, showing that sulfur is mainly deposited near the reactor inlet.

[0081] Moreover, the test shows that the desulfurization rate is much faster than the hydrogenation decolorization rate. Table 1 below shows that under various operating conditions (while the percentage reduction at UV-270nm varies from 65% to 94%), the sulfur concentration in the PDO leaving the reactor is below the detection limit of 1 ppm.

[0082] Temperature

Embodiment 2

[0084] Test-37 was carried out in a single reactor filled with 250mm catalyst at multiple temperatures (80°C, 100°C, and 120°C, but mainly at 100°C), 2860kPa, 0.8l / h LHSV, H2 / PDO=6.1scc / g. The test continues until the reactor bed is partially deactivated but still meets the required UV specifications. Stop the test and take out the catalyst in stages and analyze its sulfur content.

[0085] Figure 2 more clearly shows that sulfur is mainly deposited near the bed entrance. The partially used bed (Test-37) showed that most of the sulfur accumulated in the first 1 / 3 of the bed. The widely used catalyst bed (Test-36) showed that most of the sulfur accumulated in the first half of the bed.

Embodiment 3

[0087] Samples of used catalysts from the three stages of Test-36 were taken to represent poisoned catalysts with different levels of sulfur on the catalyst. The hydrogenation activity of these samples and the hydrogenation activity of fresh catalyst samples were measured under the same conditions of 3.8 l / h LHSV, 100°C, and 2860 kPa.

[0088] Figure 3 shows the decolorizing activity of the catalyst, measured by the percentage decrease in absorption at UV-270nm, which decreases as the level of sulfur accumulated on the catalyst increases.

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Abstract

The invention provides a method to extend the utilization of a catalyst in a multistage reaction system, provided that a primary reaction and a secondary (or more) catalyst-poisoning reaction occur on the same catalyst, and the rate of the secondary (or more), catalyst-poisoning reaction is faster than the rate of the primary reaction.

Description

[0001] Cross-references to related applications [0002] This application claims the benefits of U.S. Provisional Application 60 / 615083 filed on October 1, 2004, which is hereby incorporated by reference. Invention field [0003] The invention relates to a method for expanding the utilization rate of a catalyst in a multi-stage reactor system. More specifically, the present invention relates to a method for expanding the utilization of a catalyst in a reaction group (ie, hydrogenation and desulfurization) catalyzed on the same catalyst, in which one reaction causes catalyst poisoning. Background technique [0004] Hydrogenation is a commonly used method in the petroleum, chemical and food industries. Depending on the harshness of the feed and operating conditions (such as temperature, pressure and contact time), the hydrogenation process can saturate unsaturated bonds, reduce aldehydes and ketones, reduce carboxylic acids and their esters, reduce nitrogen-containing compounds, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J8/04
CPCB01J8/0457C10G65/02B01J35/0006B01J2219/0004B01J2208/00707B01J8/0085B01J35/19B01J8/04B01J8/00C10G65/04
Inventor G·F·迪芬达尔M·西潘
Owner EI DU PONT DE NEMOURS & CO