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Regeneration method for dehydrogenation catalyst

A dehydrogenation catalyst and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of difficult recovery of active centers and increased sintering of active centers And other issues

Active Publication Date: 2015-05-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The above-mentioned methods all use high-temperature air to burn charcoal to regenerate the chromium oxide-alumina dehydrogenation catalyst, and the regeneration temperature is higher than the dehydrogenation reaction temperature, which will make it difficult to restore the activity of the active center deactivated by the sintering of the catalyst, making the activity The amount of sintering in the center increases

Method used

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  • Regeneration method for dehydrogenation catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Carrier preparation

[0023] Weigh 66.0g of pseudo-boehmite and 2.64g of bentonite to make a small spherical carrier through thorough mixing and kneading. The wet catalyst was dried in the air overnight, and dried at 120°C for 4 hours, and the dried sample was placed in a high-temperature furnace, raised to 600°C, and roasted at a constant temperature for 4 hours. prepared as a carrier;

[0024] (2) Formulated to 18.0% (weight concentration) Cr(NO 3 ) 3 aqueous solution;

[0025] (3) Prepare 3.86% (weight concentration) of KNO 3 aqueous solution;

[0026] (4) Take 86.80g of Cr(NO 3 ) 3 Aqueous solution, step (1) Immerse with the prepared carrier for 40 minutes, then dry at 120°C for 3 hours, and roast at a constant temperature of 580°C for 6 hours;

[0027] (5) Take 21.84g of KNO prepared in step (3) 3 Catalyst A was prepared by immersing in aqueous solution for 40 minutes, drying at 120°C for 3 hours, and roasting at 650°C for 4 hours.

Embodiment 2

[0029] (1) Prepare 3.86% (weight concentration) of KNO 3 aqueous solution.

[0030] (2) Formulated to 18.0% (weight concentration) Cr(NO 3 ) 3 aqueous solution.

[0031] (3) Combine 66.00g of pseudoboehmite, 2.64g of bentonite and 21.84g of KNO prepared in step (1) 3 The aqueous solution is fully mixed, kneaded, made into a plastic body and extruded into small balls. Then, it was dried at 120°C for 3 hours, and the dried sample was placed in a high-temperature furnace, and fired at a constant temperature of 580°C for 4 hours. Made of alumina carrier containing additives.

[0032] (4) Take 86.80g of Cr(NO 3 ) 3 The aqueous solution was used to impregnate the carrier prepared in step (4) for 40 minutes, then dried at 120°C for 3 hours, and then calcined at 650°C for 6 hours to prepare catalyst B.

Embodiment 3

[0034] The catalyst prepared in Example 1 is used in isobutane dehydrogenation to produce isobutene, dehydrogenation reaction conditions: reaction temperature 600°C, reaction space velocity 1000h -1 , the reaction pressure is normal pressure, the reaction time is 25min, and the deactivated catalyst A1 is obtained.

[0035] The catalyst prepared in Example 2 is used in isobutane dehydrogenation to produce isobutene, dehydrogenation reaction conditions: reaction temperature 600°C, reaction space velocity 1000h -1 , the reaction pressure is normal pressure, the reaction time is 25min, and the deactivated catalyst B1 is obtained.

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Abstract

The invention discloses a regeneration method for a dehydrogenation catalyst. The dehydrogenation catalyst is a chromium-aluminum catalyst. The regeneration method comprises the following steps: subjecting the deactivated dehydrogenation catalyst to regeneration in the presence of gas containing oxygen, wherein regeneration temperature is 400 to 600 DEG C and regeneration time is 0.1 to 2.0 hours; then cooling the dehydrogenation catalyst to 100 to 250 DEG C; and treating the dehydrogenation catalyst with organic-acid-containing air and water vapor in a specific ratio for 0.1 to 4.0 hours. The method can remove carbon deposit and improve early activity and resistance to carbon deposition of the regenerated catalyst and enables properties of the regenerated catalyst like selectivity and stability to basically return to the level of a fresh catalyst.

Description

technical field [0001] The invention relates to a regeneration method of a dehydrogenation catalyst, in particular to a regeneration method of a chromium oxide-alumina catalyst used for the dehydrogenation of low-carbon alkanes. Background technique [0002] Since the beginning of the new century, human demand for the world's petrochemical raw materials and petrochemical products will continue to grow, and the demand for propylene as the basic petrochemical raw material will continue to grow. However, traditional conventional methods can no longer meet the rapidly growing demand, making the market a global market. shortage. And with the increasing scarcity of petroleum resources, the production of propylene has changed from purely relying on petroleum as a raw material to diversifying the technical route of raw materials, especially the technical route of producing propylene with low-carbon alkanes as raw materials. In recent years, the technology of producing propylene fro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/92
Inventor 李江红张海娟王振宇乔凯
Owner CHINA PETROLEUM & CHEM CORP
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