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Regeneration method of vanadium-based catalyst for dehydrogenation of low-carbon alkane

A low-carbon alkane and catalyst technology, which is applied in the field of regeneration of vanadium-based catalysts for low-carbon alkane dehydrogenation, can solve the problems of short service life, decreased activity, etc. The effect of full sexual recovery

Active Publication Date: 2014-11-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the activity of the existing low-carbon alkane dehydrogenation vanadium-based catalyst is reduced after regeneration, and the service life is not long. A new regeneration method for low-carbon alkane dehydrogenation vanadium-based catalyst is provided

Method used

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  • Regeneration method of vanadium-based catalyst for dehydrogenation of low-carbon alkane
  • Regeneration method of vanadium-based catalyst for dehydrogenation of low-carbon alkane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Regeneration of deactivated catalyst A

[0027] 5.0 g of deactivated catalyst A was regenerated on the continuous flow quartz tube reactor micro-catalyst reaction device, with N 2 As carrier gas, first use 0.5 mol % O 2 Airflow at 400 o C burns charcoal on the deactivated catalyst for 2 hours, and then uses 5 mol % O 2 Airflow at 600 o C was charcoalized for 2 hours.

[0028] 5.7mg ammonium metavanadate and 9.9mg cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O) was uniformly mixed with 2 mL of water to form an impregnation solution, the corresponding elemental vanadium mass was 0.05% of the catalyst mass, and the corresponding elemental cobalt mass was 0.04% of the catalyst mass.

[0029] The deactivated catalyst after burning charcoal in the above impregnation solution at 60 oC Immerse for 2 hours, then place the impregnated sample in an oven at 110 oC Let dry for 4 hours. The dried samples were then heated in a muffle furnace at 550 oC Bake for 4 hours. Finally, th...

Embodiment 2

[0032] Regeneration of deactivated catalyst A

[0033] 5.0 g of deactivated catalyst A was regenerated on a continuous flow quartz tube reactor micro-catalytic reaction device, using He as the carrier gas, first with 0.1 mol % O 2 Airflow at 400 o C burns charcoal on the deactivated catalyst for 5 hours, and then uses 1 mol % O 2 The airflow at 500 o C carried out charcoal treatment for 5 hours.

[0034] 1.15mg ammonium metavanadate and 2.5mg cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O) was uniformly mixed with 2 mL of water to form an impregnation solution, the corresponding elemental vanadium mass was 0.01% of the catalyst mass, and the corresponding elemental cobalt mass was 0.01% of the catalyst mass.

[0035] The deactivated catalyst after burning charcoal was placed in the above impregnation solution at 10 o C impregnated for 24 hours, and then the impregnated sample was placed in an oven at 90 oC Let dry for 24 hours. The dried samples were then placed in a muffle fur...

Embodiment 3

[0038] Regeneration of deactivated catalyst A

[0039] 5.0 g of deactivated catalyst A was regenerated on a continuous flow quartz tube reactor miniature catalytic reaction device, with Ar as the carrier gas, first with 1 mol % O 2 The airflow at 500 o C burns charcoal to the deactivated catalyst for 0.5 hour, and then uses 5 mol % O 2 Airflow at 700 o C was charcoalized for 0.5 hours.

[0040] 115mg ammonium metavanadate and 250mg cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O) was uniformly mixed with 2 mL of water to form an impregnation solution, the corresponding elemental vanadium mass was 1% of the catalyst mass, and the corresponding elemental cobalt mass was 1% of the catalyst mass.

[0041] The deactivated catalyst after burning charcoal in the above impregnation solution at 80 oC Immerse for 1 hour, then place the impregnated sample in an oven at 150 oC Let dry for 1 hour. The dried samples were then heated in a muffle furnace at 650 oC Bake for 1 hour. Finally, ...

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Abstract

The invention relates to a regeneration method of a vanadium-based catalyst for dehydrogenation of low-carbon alkane, which mainly aims at solving the problems that the service life is not long as the activity declines after the regeneration of the existing vanadium-based catalyst for dehydrogenation of low-carbon alkane. According to the regeneration method, a deactivated catalyst is subjected to the following steps in sequence: (a) burning carbon by airflow containing 0.1-5mol% of O2 in stages, i.e., firstly removing most of deposited carbon on the surface and in the pores of the catalyst at low temperature and then further burning carbon of the catalyst at high temperature; (b) impregnating the catalyst with a solution containing vanadium and assistant components, then drying the impregnated catalyst and roasting; and (c) treating the catalyst for 0.5-10 hours in hot air containing water vapor, thereby restoring the deactivated catalyst to the state of the original fresh catalyst in short time. By virtue of the technical scheme in which complete activation regeneration is achieved and the service cycle and life of the catalyst are prolonged, the problems are well solved and the regeneration method can be applied to industrial production of low-carbon alkane dehydrogenation.

Description

technical field [0001] The invention relates to a regeneration method of a low-carbon alkane dehydrogenation vanadium-based catalyst. Background technique [0002] As an important organic chemical raw material, low-carbon olefins are widely used in the production of plastics, synthetic rubber, drugs, gasoline additives, ion exchange resins, detergents, fragrances and various chemical intermediates. Propylene / isobutene in low-carbon olefins mainly comes from the co-production or by-product of naphtha steam cracking and fluid catalytic cracking in refineries, and the potential for increasing production is very limited. These methods alone are difficult to meet the needs of the rapid development of my country's chemical industry . Propane / isobutane dehydrogenation technology has become an important source of propylene / isobutene following the co-production or by-product of steam cracking and fluid catalytic cracking processes. Propane / isobutane dehydrogenation catalysts can be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/90B01J29/78B01J23/94B01J23/847
Inventor 曾铁强吴文海樊志贵姜冬宇缪长喜
Owner CHINA PETROLEUM & CHEM CORP
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