Regeneration method and application of low-alkane dehydrogenation catalyst

A technology for dehydrogenation catalysts and low-carbon alkanes, applied in catalyst regeneration/reactivation, carbon compound catalysts, catalysts, etc., can solve problems such as alkali metal loss, alumina support crystal phase transition, metal aggregation, etc., to achieve easy operation, The effect of small temperature change and prolonging the service life

Inactive Publication Date: 2016-06-22
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When these two methods are used for catalyst regeneration, water vapor is introduced, which will not only cause the crystal phase transformation of the alumina carrier, but also cause the loss of alkali metal in the low-carbon alkane catalyst, and also cause metal aggregation to a certain extent.
[0008] It can be seen from the above regeneration methods of noble metal-based dehydrogenation catalysts that oxygen, halogen or water vapor are usually purposefully introduced during the regeneration process, although the problems of carbon deposition, metal accumulation and alkali metal loss are solved to a certain extent , but it often brings other side effects, and the above three problems cannot be taken into account at the same time, which inevitably results in the performance and life of the low-carbon alkane dehydrogenation regeneration catalyst

Method used

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  • Regeneration method and application of low-alkane dehydrogenation catalyst

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Experimental program
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Effect test

Embodiment 1

[0025] Weigh commercially available alumina carrier (γ phase, spherical, diameter 0.5mm, pore volume 0.71cm 3 / g, specific surface area 224m 2 / g) 30g, add deionized water dropwise to initial moistening, and the volume of consumed water is 27mL. Based on the weight content of 0.4% of the Sn element in the final catalyst, stannous chloride containing 0.12 g of Sn was weighed and dissolved in ethanol, and the volume was adjusted to 27 mL with ethanol. The prepared Sn-containing ethanol solution was added to 30 g of alumina carrier, mixed evenly, and aged at room temperature for 2 hours. Dry at 80°C for 8h, then bake at 600°C for 4h.

[0026] Based on the weight content of 0.5% of the Pt element in the final catalyst, weigh 0.18g of Pt-containing chloroplatinic acid and dissolve it in deionized water, set the volume to 27mL, add it to the Sn-containing alumina carrier, mix well, and age at room temperature for 4h. Dry at 100°C for 6h, and bake at 600°C for 4h. The sample obta...

Embodiment 2

[0029] Weigh commercially available alumina carrier (γ phase, spherical, diameter 0.5mm, pore volume 0.71cm 3 / g, specific surface area 224m 2 / g) 30g, add deionized water dropwise to initial moistening, and the volume of consumed water is 27mL. Based on the weight content of 0.6% of the Sn element in the final catalyst, stannous chloride containing 0.18g of Sn was weighed and dissolved in ethanol, and the volume was adjusted to 27mL. The prepared Sn-containing ethanol solution was added to 30 g of alumina carrier, mixed evenly, and aged at room temperature for 4 hours. Dry at 100°C for 6h, then bake at 500°C for 6h.

[0030] Based on the weight content of 0.7% of the Pt element in the final catalyst, weigh 0.12 g of Pt-containing chloroplatinic acid and dissolve it in deionized water, set the volume to 27 mL, add it to the Sn-containing alumina carrier, mix well, and age at room temperature for 2 h. Dry at 120°C for 4h, and bake at 500°C for 6h. The sample obtained in the...

Embodiment 3

[0033] After the C-1 fresh agent reacted for 72 hours, switch the raw material gas to pure hydrogen gas, purging for 1 hour, then the temperature dropped to 450°C, the pressure rose to 8MPa, and then hydrogen and tetralin were introduced at the same time. The speed is 1.5h -1 , the volume ratio of hydrogen to tetralin is 350:1, and the treatment time is 3h. After the treatment is over, switch to nitrogen, drop to normal pressure, and drop to room temperature, and the volumetric space velocity is 8.0h -1 The deactivated catalyst was cleaned by passing through cyclohexane for 2 hours, and then purged at 100° C. for 3 hours in a nitrogen atmosphere. Under a nitrogen atmosphere, raise the temperature of the deactivated catalyst to 450°C, raise the pressure to 3MPa, and then feed the mixed gas of hydrogen and carbon dioxide. The volume content of carbon dioxide in the mixed gas is 20%, and the volume space velocity is 350h -1 , the processing time is 3h. Obtain C-1 primary regen...

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Abstract

The invention discloses a regeneration method and application of a low-alkane dehydrogenation catalyst. The method includes the following steps that firstly, under the hydrogen atmosphere, a hydrogen-donor solvent is used for processing a deactivated catalyst; secondly, the deactivated catalyst processed in the first step is processed in a mixed atmosphere containing hydrogen and carbon dioxide, and then the regenerated catalyst is obtained. By means of the method, after a noble-metal-based low-alkane dehydrogenation catalyst is regenerated, the dehydrogenation activity of the regenerated catalyst can be restored the level of a fresh catalyst, the regeneration technology is simple, and social and economic benefits are good.

Description

technical field [0001] The invention relates to a regeneration method of a low-carbon alkane dehydrogenation catalyst and its application, in particular to a regeneration method of a noble metal-based catalyst for propane and isobutane dehydrogenation. Background technique [0002] The shale revolution in North America has brought a large amount of low-carbon alkanes resources, resulting in the lightening of raw materials for ethylene crackers and a sharp drop in propylene production. At the same time, under the background of increasingly scarce petroleum resources, the production of propylene has changed from purely relying on petroleum as a raw material to diversifying the technical route of raw material sources, and it has gradually become a trend. Dehydrogenation of propane by-produced in natural gas (conventional natural gas, shale gas, coalbed methane, combustible ice, etc.) to produce propylene is an effective way to solve this problem. In recent years, the technolog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J38/56B01J38/58B01J38/10B01J23/62C07C5/333C07C11/06C07C11/09
CPCY02P20/52Y02P20/584B01J38/56B01J23/626B01J38/10B01J38/58C07C5/3337C07C2523/62C07C11/06C07C11/09
Inventor 张海娟李剑封瑞江段林海吴明王卫强
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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