A kind of regeneration method of aromatization catalyst

A catalyst and aromatization technology, applied in catalyst regeneration/reactivation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of easy carbon deposition, low recovery ability, catalyst deactivation, etc. The effect of carbon deposition in micropores and improving regeneration level

Active Publication Date: 2019-12-13
东方傲立石化有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While having high reactivity, ZSM-5 molecular sieve catalysts are prone to carbon deposition during the reaction process, leading to catalyst deactivation. Generally, the deactivated catalyst is recovered by burning charcoal, but the recovery ability of the existing charcoal burning regeneration technology The reason is that there are still some carbon deposits in the micropores of the catalyst that have not been burned, and the active centers of the catalyst are mainly located in the micropores. Therefore, a regeneration technology that can remove most of the micropore carbon deposits is needed to improve Catalyst Recovery Level

Method used

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  • A kind of regeneration method of aromatization catalyst
  • A kind of regeneration method of aromatization catalyst
  • A kind of regeneration method of aromatization catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0017] A regeneration method for an aromatization catalyst, comprising the following steps:

[0018] (1) Switch the reactor: gradually reduce the feed load of the reactor to be regenerated to 30%, and at the same time slowly reduce the temperature in the reactor, and the cooling rate does not exceed 30°C / h; when the temperature in the reactor drops to 300°C, reduce Reactor feed load to 20%; when the temperature in the reactor drops below 250°C and the furnace temperature of the heating furnace is below 300°C, stop the feed to the reactor and stop heating the reactor; the reactor to be regenerated Switch to another reactor that has been warmed up to operating temperature and isolate the reactor to be regenerated.

[0019] (2) Nitrogen circulation heating with oil: Turn on the nitrogen circulation, and when the pressure and flow of nitrogen are stable, slowly raise the temperature in the reactor to be regenerated to 327°C at a heating rate of 14-16°C / h.

[0020] (3) Burning in ...

Embodiment 2

[0026] The difference between this embodiment and embodiment 1 is that the operations from step (2) to step (5) are:

[0027] (2) Nitrogen circulation heating with oil: Turn on the nitrogen circulation, and when the pressure and flow of nitrogen are stable, slowly raise the temperature in the reactor to be regenerated to 300°C at a rate of 10-12°C / h.

[0028] (3) Burning in the first stage: When it is observed that the combustible gas in the reactor to be regenerated is exhausted, a small amount of air is added to the circulating gas. When the temperature in the reactor to be regenerated is stabilized, the amount of air added continues to be The temperature of the layer is below 450°C; when the temperature in the reactor to be regenerated, CO 2 When the content does not change and there is no generated water, increase the temperature in the reactor to be regenerated to 480°C.

[0029] (4) Burning in the second stage: when the CO in the reactor to be regenerated 2 When the co...

Embodiment 3

[0032] The difference between this embodiment and embodiment 1 is that the operations from step (2) to step (5) are:

[0033] (2) Nitrogen circulation heating with oil: Turn on the nitrogen circulation, and when the pressure and flow of nitrogen are stable, slowly raise the temperature in the reactor to be regenerated to 350°C at a rate of 18-20°C / h.

[0034] (3) Burning in the first stage: When it is observed that the combustible gas in the reactor to be regenerated is exhausted, a small amount of air is added to the circulating gas. When the temperature in the reactor to be regenerated is stabilized, the amount of air added continues to be The temperature of the layer is below 450°C; when the temperature in the reactor to be regenerated, CO 2 When the content does not change and there is no generated water, raise the temperature in the reactor to be regenerated to 525°C.

[0035] (4) Burning in the second stage: when the CO in the reactor to be regenerated 2 When the conte...

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Abstract

The invention provides a regeneration method of an aromatization catalyst. The regeneration method comprises the following steps that (1) a reactor is switched; (2) nitrogen is cyclically heated to take away oil; (3) burning is conducted at the first stage; (4) burning is conducted at the second stage; (5) micropore carbon is removed at the third stage; (6) nitrogen is replaced to remove oxygen; and (7) production and operation for the next period are conducted. The regeneration condition designed by the invention can not only better protect strong acid site, but also can well remove the accumulated carbon covering the acid site, accordingly the acid site is recovered, and the regeneration level of the catalyst is improved. Meanwhile, the regeneration method provided by the invention can well eliminate the micropore accumulated carbon of the catalyst, accordingly the active center in the micropore of the catalyst can be exposed, and the regeneration level of the catalyst is further improved.

Description

technical field [0001] The invention relates to the technical field of catalyst regeneration, in particular to a method for regeneration of an aromatization catalyst. Background technique [0002] The purpose of the naphtha aromatization unit is to convert naphtha into mixed aromatics containing benzene, toluene and xylene through an aromatization reaction under the action of ZSM-5 molecular sieve catalyst, and simultaneously generate hydrogen, methane and carbon The gas phase of the two to five fractions. Then, through a series of separations, light aromatics and heavy aromatics that meet the standards are finally produced, while low-olefin liquefied gas and a small amount of dry gas are by-produced. While having high reactivity, ZSM-5 molecular sieve catalysts are prone to carbon deposition during the reaction process, leading to catalyst deactivation. Generally, the deactivated catalyst is recovered by burning charcoal, but the recovery ability of the existing charcoal b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J38/02B01J38/12B01J38/04B01J35/10
Inventor 郭银亮崔秋生
Owner 东方傲立石化有限公司
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