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Regeneration method of platinum-containing low-carbon alkane dehydrogenation catalyst

A technology for dehydrogenation catalysts and low-carbon alkanes, which is applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., and can solve the problems of short service life and decreased activity. , to achieve the effect of long service life, promotion of dehydrogenation activity, and slow deactivation rate of catalyst carbon deposition

Active Publication Date: 2016-09-07
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 the problem that the activity decreases after regeneration and the service life is not long in the existing platinum-containing low-carbon alkane dehydrogenation catalyst regeneration technology, and a new platinum-containing low-carbon alkane dehydrogenation catalyst is provided. regeneration method

Method used

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  • Regeneration method of platinum-containing low-carbon alkane dehydrogenation catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Regeneration of deactivated catalyst A

[0024] 5.0 grams of deactivated catalyst A are regenerated on the continuous flow fixed-bed quartz tube reactor miniature catalytic reaction device, at normal pressure, the mass space velocity of the total air flow kept in each treatment step is 9.2h -1 Under the condition of 2 As carrier gas, containing 0.5mol % O 2 Airflow at 400 o C burn charcoal to the deactivated catalyst for 2 hours, and then use N 2 as carrier gas, containing 5 mol % O 2 Airflow at 600 o C was charcoaled for 2 hours, followed by N with 25 ppm dichloroethane and 500 ppm ethanol 2 Airflow at 600 o C treated the deactivated catalyst for 1 h, and then treated with 6 mol% O 2 Airflow at 600o C treated the chlorine-supplemented catalyst for 1 hour with H 2 Airflow at 600 o C treated the catalyst for 4 hours, and finally with 3 ppm H 2 S of H 2 Airflow at 620 o Catalyst C was treated for 2 hours to obtain regenerated catalyst C.

Embodiment 2

[0026] Regeneration of deactivated catalyst A

[0027] 5.0 grams of deactivated catalyst A are regenerated on the continuous flow fixed-bed quartz tube reactor miniature catalytic reaction device, and at normal pressure, the mass space velocity of the total air flow kept in each step is 10h -1 Under the condition of 2 as carrier gas, containing 0.1 % O 2 Airflow at 300 o C burns charcoal on the deactivated catalyst for 10 hours, and then uses 1 mol % O 2 The airflow at 500 o C was subjected to charcoal treatment for 10 hours, followed by a solution containing 500 ppm HCl and 50 000 ppm H 2 O of N 2 Airflow at 500 o C treated the deactivated catalyst for 0.5 h, and then treated with 1 mol % O 2 Airflow at 800 o C treated the chlorine-supplemented catalyst for 2 hours with H 2 Airflow at 500 o C treated the catalyst for 5 hours, and finally with 10 ppm H 2 S of H 2 Airflow at 450 o C treated the catalyst for 5 hours to obtain the regenerated catalyst D.

Embodiment 3

[0029] Regeneration of deactivated catalyst A

[0030] 5.0 grams of deactivated catalyst A are regenerated on the continuous flow fixed-bed quartz tube reactor miniature catalytic reaction device, at normal pressure, the mass space velocity of the total air flow kept in each treatment step is 9.2h -1 Under the condition of 2 as carrier gas, containing 1 %O 2 The airflow at 500 o C burns charcoal to the deactivated catalyst for 0.5 hour, and then uses 10 mol % O 2 Airflow at 800 o C was charcoaled for 0.5 hours, followed by N with 2 ppm carbon tetrachloride and 1 ppm diethyl ether. 2 Airflow at 800 o C treated the deactivated catalyst for 10 hours, and then treated with 10 mol% O 2 The airflow at 500 o C treated the chlorine-supplemented catalyst for 0.5 hours, with H 2 Airflow at 500 o C treated the catalyst for 4 hours, and finally with 1 ppm H 2 S of H 2 Airflow at 650 o C treated the catalyst for 5 hours to obtain the regenerated catalyst E.

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Abstract

The invention relates to a regeneration method for a platinum-containing low-carbon alkane dehydrogenation catalyst, which mainly solves the problems of reduced activity and short service life of the existing platinum-containing low-carbon alkane dehydrogenation catalyst after regeneration. The present invention adopts a regeneration method of platinum-containing low-carbon alkane dehydrogenation catalyst, and the deactivated catalyst adopts the following steps successively: a) using a catalyst containing 0.1 to 10 mol% O 2 The gas flow is charcoalized in stages; b) using halogen-containing components and H 2 The gas flow of O or decomposable oxygen-containing compounds contacts the deactivated catalyst, increasing the halogen content of the catalyst; c) using a catalyst containing 1 to 10 mol% O 2 The catalyst is treated with airflow to promote the redispersion of the active metal component Pt; d) 450~650 in a reducing atmosphere o C reduction of active metal components; e) sulfidation treatment of catalysts, a technical solution to fully activate and regenerate deactivated catalysts in a relatively short period of time, which solves this problem well and can be used in the industrial production of low-carbon alkane dehydrogenation.

Description

technical field [0001] The invention relates to a regeneration method of a platinum-containing low-carbon alkane dehydrogenation catalyst. Background technique [0002] The dehydrogenation of light alkanes to olefins is an important chemical process. With the development of the chemical industry, low-carbon olefins have a wide range of uses and values ​​as important raw materials for the production of plastics, synthetic rubber, drugs, gasoline additives, ion exchange resins, detergents, fragrances and various chemical intermediates. In order to meet the huge demand for low-carbon alkanes, the development of the process of producing low-carbon alkanes from low-value-added alkanes is of great significance for making full use of low-carbon alkanes to open up new sources of alkenes. Propylene / isobutene mainly comes from the steam cracking of naphtha and liquefied petroleum gas and the co-production or by-product of the fluid catalytic cracking process in refineries. At present...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/96B01J23/62
Inventor 曾铁强吴文海樊志贵吴省刘瑞丹缪长喜
Owner CHINA PETROLEUM & CHEM CORP