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Regeneration method of olefin isomerization catalyst

An olefin isomerization and catalyst technology, which is applied in the field of olefin isomerization catalyst regeneration, can solve the problems of reduced catalytic activity, inability to regenerate multiple times in the device, and achieves elimination of carbon formation, structure collapse, and avoidance of overheating. effect of the phenomenon

Active Publication Date: 2015-07-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the catalytic activity of the isomerization catalyst magnesium oxide in the prior art is reduced after regeneration, and the problem that it cannot be regenerated or regenerated multiple times in the prior art is provided. A new regeneration method for olefin isomerization catalysts is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Pre-purge with nitrogen for 10 hours at 200°C, and the mass space velocity of nitrogen is 150h -1 ;Introduce air until the oxygen content is 1mol%, after the temperature stops rising, raise the temperature to 420°C at a heating rate of 5°C / min, keep the temperature constant for 2 hours, increase the amount of air until the oxygen content is 5mol%, burn until the temperature stops rising, Raise the temperature to 600°C at a heating rate of 5°C / min, keep the temperature constant for 6 hours, and continue to increase the amount of air until the oxygen content is 5.5mol%. After the temperature stops rising, stop feeding air, and continue purging with nitrogen for 12 hours. Taking the reaction of isomerization of butene-1 to butene-2 ​​as an example, a fixed bed reactor is used, the loading amount of raw catalyst is 50 grams, and the catalyst is evaluated under the conditions of reaction temperature of 300°C and reaction pressure of 3.0Mpa Activity, the results are shown in ...

Embodiment 2

[0016] Pre-purge with nitrogen for 6 hours at 300°C, and the mass space velocity of nitrogen is 100h -1 ;Introduce air until the oxygen content is 0.6mol%, after the temperature stops rising, raise the temperature to 440°C at a heating rate of 8°C / min, keep the temperature for 3 hours, increase the amount of air until the oxygen content is 4mol%, burn until the temperature stops rising , the temperature was raised to 580°C at a heating rate of 8°C / min, and the temperature was kept constant for 5 hours; continue to increase the amount of air until the oxygen content was 8mol%, and after the temperature stopped rising, stop feeding air and continue purging with nitrogen for 10 hours. Catalyst activity was evaluated under the same reaction conditions as in Example 1, and the results are shown in Table 1.

Embodiment 3

[0018] Pre-purge with nitrogen for 4 hours at 400°C, and the mass space velocity of helium is 50h -1 ;Introduce air until the oxygen content is 0.4mol%, after the temperature stops rising, raise the temperature to 460°C at a heating rate of 10°C / min, keep the temperature for 4 hours, increase the amount of air until the oxygen content is 3mol%, burn until the temperature stops rising , the temperature was raised to 560°C at a heating rate of 10°C / min, and the temperature was kept constant for 4 hours; continue to increase the amount of air until the oxygen content was 10mol%, and after the temperature stopped rising, stop feeding air, and continue purging with helium for 8 hours. Catalyst activity was evaluated under the same reaction conditions as in Example 1, and the results are shown in Table 1.

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PUM

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Abstract

The invention relates to a regeneration method of an olefin isomerization catalyst. The problems that the catalytic activity is reduced after the olefin isomerization catalyst in the prior art is regenerated, and the olefin isomerization catalyst cannot regenerate in an apparatus and regenerate for a plurality of times are mainly solved. The regeneration method orderly comprises the following steps: a) leading in a gas which is inert to reaction in a reactor after reaction is stopped, and pre-purging the catalyst for 2-10 hours at 200-400 DEG C; b) leading into an oxygen gas until the oxygen content is 0.1-1mol%, burning until the temperature stops rising; c) heating to 420-500 DEG C, increasing the flow of the oxygen gas until the content of the oxygen is 1.5-5mol%, and burning until the temperature stops rising; d) heating to 520-600 DEG C, continuing to increase the flow of the oxygen gas until the content of the oxygen is 5.5-15mol%, and burning until the temperature stops rising; e) stopping leading in the oxygen gas, and continuing to purge the gas which is inert to the reaction via heat. By adopting the regeneration method, the problem is better solved; the regeneration method can be applied to regeneration of the olefin isomerization catalyst in industrial application.

Description

technical field [0001] The invention relates to a regeneration method of an olefin isomerization catalyst. Background technique [0002] Magnesium oxide is a very potential catalyst, catalyst support and adsorbent. In recent years, the research on the surface structure and catalytic performance of magnesium oxide has attracted widespread attention. Many research works have pointed out that due to the high surface reactivity of magnesia itself, by increasing the specific surface area of ​​magnesia, it can show excellent catalytic and adsorption performance, especially for olefin isomerization reactions, high specific surface area oxidation Magnesium is a great catalyst. [0003] CN100379712C reported a method for high-purity magnesium oxide as an isomerization catalyst. This technology is mainly used in the isomerization of butene-2 ​​to butene-1, and the conversion rate of butene-2 ​​is 20-30%. [0004] CN1522175 provides a method for treating basic metal oxide olefin iso...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/20B01J21/10B01J38/20B01J38/14C07C5/25C07C11/08
CPCY02P20/584
Inventor 董静刘苏
Owner CHINA PETROLEUM & CHEM CORP
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