Low-carbon alkane circulating fluidized bed dehydrogenation process

A circulating fluidized bed, low-carbon alkane technology, applied in the direction of hydrocarbons, hydrocarbons, carbon compound catalysts, etc., can solve the problem of high cost of tubular reactors, improve the anti-carbon performance, effectively provide, Produce continuous effects

Active Publication Date: 2017-12-19
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of a tubular fixed bed can make the temperature distribution of the bed more uniform, and the regeneration cycle of the catalyst can be extended to a certain extent, but the cost of the tubular reactor is still high

Method used

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  • Low-carbon alkane circulating fluidized bed dehydrogenation process
  • Low-carbon alkane circulating fluidized bed dehydrogenation process
  • Low-carbon alkane circulating fluidized bed dehydrogenation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] In a reactor heated by a water bath, add 50kg water, 4kg pseudo-boehmite and 1kg aluminum sol and stir evenly, acidify with 3kg nitric acid (analytical purity), heat up to 80℃, age for 4h; add 5kg macropore after cooling to room temperature Alumina is mixed uniformly and spray-dried to form, and calcined at 700°C for 6 hours to obtain a microsphere carrier.

[0048] 1.04kg K 2 Cr 2 O 7 Dissolved in 6.4L glycerol, immersed in an equal volume in 8kg microsphere carrier. Place it in an oven at 140°C for 1 hour, wash with deionized water, filter, and dry at 80°C for 4 hours. 0.26kg NaNO 3 , 0.66kg Ni(NO 3 ) 2 ·6H 2 O was dissolved in 6.4L deionized water, immersed in an equal volume in the above-treated microsphere carrier, dried at 60°C for 6 hours, and calcined at 720°C for 4 hours. The obtained catalyst was designated as catalyst A.

[0049] Butane dehydrogenation:

[0050] The reaction process conditions are as follows: reaction temperature is 610℃, pressure is 0.20MPa, cata...

Embodiment 2

[0061] In a water bath heated reactor, add 50kg water, 3kg pseudo-boehmite and 1kg aluminum sol, stir evenly, acidify with 2kg hydrochloric acid (analytical purity), heat to 70℃, age for 2h; add 8kg macropore after cooling to room temperature Alumina is mixed uniformly and spray-dried to form, and calcined at 550°C for 4 hours to obtain a microsphere carrier.

[0062] 1.77kg CrO 3 , 2.48kg(NH 4 ) 2 C 2 O 4 Dissolved in 8L of deionized water, immersed in 10kg of microsphere carrier in equal volume. Place it in an oven at 60°C for 6h, wash with deionized water, filter, and dry at 100°C for 2h. 0.78kg Cu(NO 3 ) 2 ·3H 2 O, 1.12kg Fe(NO 3 ) 3 · 9H2O was dissolved in 7L of deionized water, immersed in an equal volume in the above-treated microsphere carrier, dried at 120°C for 3 hours, and calcined at 700°C for 6 hours. The obtained catalyst was designated as catalyst C.

[0063] Butane dehydrogenation:

[0064] The reaction process conditions are as follows: reaction temperature is 595℃...

Embodiment 3

[0075] In a reactor heated by a water bath, add 50kg water, 4kg pseudo-boehmite and 3kg aluminum sol, stir evenly, acidify with 1kg hydrochloric acid (analytical purity), heat to 50℃, aging for 0.5h; add 8kg after cooling to room temperature The porous alumina is mixed uniformly and spray-dried to form, and calcined at 450°C for 2 hours to obtain the microsphere carrier.

[0076] 2.23kg(NH 4 ) 2 Cr 2 O 7 Dissolve in 8L ethylene glycol and immerse it in 10kg microsphere carrier in equal volume. Place it in an oven at 120°C for 4h, wash with deionized water, filter, and dry at 80°C for 2h. 0.37kg KNO 3 Dissolved in 8L of deionized water, immersed in an equal volume in the above-treated microsphere support, dried at 80°C for 4 hours, and calcined at 680°C for 5 hours. The obtained catalyst was designated as catalyst E.

[0077] Butane dehydrogenation:

[0078] Reaction process conditions: reaction temperature is 585℃, pressure is 0.10MPa, catalyst-oil mass ratio is 3, ratio of catalys...

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Abstract

The invention discloses a low-carbon alkane dehydrogenation process method. According to the low-carbon alkane dehydrogenation process method, a circulating fluidized bed process is adopted, and a chromium-based microsphere catalyst is loaded; and the catalyst preparation method comprises: dissolving a high-valent chromium precursor in a reducing agent solution, and impregnating into an alumina microsphere carrier so as to prepare the catalyst. According to the present invention, the low-carbon alkane raw material enters the circulating fluidized bed reactor filled with the Cr2O3 microsphere catalyst and is subjected to the dehydrogenation reaction, and the reaction regeneration circulation system is formed through circulation coupling, such that the continuous performing of the catalytic dehydrogenation reaction and the effective supply of the heat can be ensured; and the low-carbon alkane dehydrogenation circulating fluidized bed process has advantages of simple process, continuous production, and low equipment investment.

Description

Technical field [0001] The invention relates to a low-carbon alkane dehydrogenation process, in particular to a circulating fluidized bed process for preparing butene by butane dehydrogenation and propane dehydrogenation to propylene. Background technique [0002] In recent years, with the rapid development of the global petrochemical industry, the demand for low-carbon olefins has also increased. The catalytic dehydrogenation technology of low-carbon alkanes is an effective way to increase the production of C3-C4 olefins. [0003] The catalytic dehydrogenation of low-carbon alkanes is restricted by thermodynamic equilibrium and must be carried out under harsh conditions of high temperature and low pressure. Excessive temperature increases the alkane cracking reaction and deep dehydrogenation, and decreases the selectivity. At the same time, it accelerates the surface carbon of the catalyst and makes the catalyst deactivate rapidly. Therefore, the catalyst needs to be regenerated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/08C07C11/06C07C5/333B01J23/86B01J23/26B01J35/08
CPCB01J23/26B01J23/864B01J23/866B01J23/868B01J35/08C07C5/3332C07C2523/26C07C2523/86C07C11/06C07C11/08Y02P20/52
Inventor 周金波李博李长明王艳飞李秋颖程中克苟文甲董炳利唐迎春马艳捷
Owner PETROCHINA CO LTD
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