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Regeneration method of butene oxidative dehydrogenation catalyst

A technology of oxidative dehydrogenation and catalyst, which is applied in the direction of catalyst regeneration/reactivation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc. It can solve the problem of shortened service life, long induction period, and decreased activity And other issues

Active Publication Date: 2014-12-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that there are problems in the prior art that the catalyst regeneration effect is not good, the activity decreases after regeneration, the induction period is long, and the service life is shortened. A new regeneration method for butene oxidative dehydrogenation catalyst is provided

Method used

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  • Regeneration method of butene oxidative dehydrogenation catalyst
  • Regeneration method of butene oxidative dehydrogenation catalyst
  • Regeneration method of butene oxidative dehydrogenation catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In a 1.5-liter adiabatic two-stage reactor, the iron-based spinel oxidative dehydrogenation catalyst was used, the conversion rate was 78.5%, and the selectivity was 92.6%. After the catalyst was used for 4000 hours, the conversion rate dropped to 73.2%, and the selectivity 90.4%.

[0025] At 440°C, oxygen / water vapor volume ratio = 0.03, water vapor volume space velocity 1200h -1 Carry out charcoal burning under the same conditions, and after 8 hours, the bed temperature will no longer drop; then control the reaction temperature to 380°C, the oxygen / water vapor volume ratio to 0.03, and the water vapor volume space velocity to 800h -1 , dimethyl disulfide concentration of 20ppm, and system pressure of 0.1MPa for 60 hours. The specific treatment conditions are shown in Table 1.

[0026] Stop the feeding of dimethyl disulfide, wait until the system reaches the reaction conditions, the butene feed starts to react, at 380°C, the volume space velocity of butene is 400 hour...

Embodiment 2

[0029] The catalyst after deactivation is the same as [Example 1], at 380°C, oxygen / water vapor volume ratio=0.04, water vapor volume space velocity 600h -1 Carry out charcoal burning under the same conditions, and after 6 hours, the bed temperature will no longer drop; then control the reaction temperature to 340°C, the oxygen / water vapor volume ratio to 0.05, and the water vapor volume space velocity to 1600h -1 , Methyl ethyl disulfide concentration 10ppm, system pressure 0.05MPa condition and process 70 hours, all the other are the same as [embodiment 1].

[0030]

Embodiment 3

[0032] The catalyst after deactivation is the same as [Example 1], at 380°C, oxygen / water vapor volume ratio=0.05, water vapor volume space velocity 800h -1 Carry out charcoal burning under the same conditions, and after 5 hours, the bed temperature will no longer drop; then control the reaction temperature to 420°C, the oxygen / water vapor volume ratio to 0.03, and the water vapor volume space velocity to 1600h -1 , dimethyl disulfide concentration 50ppm, system pressure 0.15MPa under the conditions of 72 hours, all the other with [embodiment 1].

[0033]

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Abstract

The invention relates to a regeneration method of a butene oxidative dehydrogenation catalyst, and mainly solves the problems of poor regeneration effect, decreased activity after regeneration, long induction period and shortened service life of the catalyst in the prior art. The method provided by the invention comprises the following steps: a) conducting carbon burning treatment on inactivated iron spinel composite oxide catalyst for butene oxidative dehydrogenation to produce butadiene at 360-480 DEG C under the conditions of oxygen / steam volume ratio of 0.01-0.06 and water vapor airspeed of 400-2000 / h for 2-24 h; b) treating the catalyst subjected to carbon burning at 300-550 DEG C under the conditions of gauge pressure of 0-0.2 MPa, oxygen / steam volume ratio of 0.01-0.1, water vapor volume space velocity of 400-4000 / h and sulfide gas phase concentration of 0-100 ppm for at least 24 h. The technical scheme well solves the problem, and can be used in industrial production of butadiene from butene oxidative dehydrogenation.

Description

technical field [0001] The invention relates to a regeneration method of a butene oxidative dehydrogenation catalyst, in particular to a regeneration method of an iron-based spinel composite oxide catalyst for preparing butadiene by oxidative dehydrogenation of butene. Background technique [0002] Butadiene is the basic raw material of petrochemical industry and an important monomer for the production of polymer synthetic materials. It can be copolymerized with various compounds to produce various synthetic rubbers and synthetic resins. At present, there are mainly two production methods of butadiene: steam cracking in refinery to ethylene co-production, C4 extraction and separation and butene oxidation. Almost all butadiene in my country comes from C4 extraction and separation. This process has economic advantages, but it is obtained as a by-product of the refinery cracking unit. With the increase in demand for butadiene production in the rubber industry, the cracking unit...

Claims

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Application Information

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IPC IPC(8): B01J23/94B01J38/20
Inventor 吴文海樊志贵曾铁强姜冬宇缪长喜
Owner CHINA PETROLEUM & CHEM CORP
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