Low-carbon alkane dehydrogenation process

A low-carbon alkanes and process technology, applied in the field of dehydrogenation of low-carbon alkanes, can solve the problems of short operating life and fast carbon deposition, and achieve the effects of low Cr content, good selectivity, and long single-pass operating cycle

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

[0012] Chromium-based dehydrogenation catalysts are characterized by high activity and fast carbon deposition. Due to the deactivation of catalyst carbon deposition, the single-pass operation life is extremely short

Method used

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  • Low-carbon alkane dehydrogenation process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh 3.4g Cr(NO 3 ) 3 9H 2 O, 0.3g KNO 3 , 0.375g Cu(NO 3 ) 2 ·3H 2 O, 1.35g Ni(NO 3 ) 2 ·6H 2 O, dissolved in 4.6ml deionized water, impregnated to 5.2g active Al 2 o 3 powder on. Keep at 60°C for 12h, dry at 120°C for 2h, calcinate at 750°C for 5h, and form and sieve to obtain the catalyst, which is designated as Catalyst A. Butane hydrodehydrogenation, the results are shown in Table 1.

Embodiment 2

[0035] Weigh 0.3g Cr 2 o 3 , dissolved in 20ml 0.3molL -1 HNO 3 In, add 7.97g pseudo-boehmite powder (Al 2 o 3 Content 64wt.%), stir to make it fully peptized. Then add 0.3g KNO 3 , 1.45g Co(NO 3 ) 2 ·6H 2 O, fully dissolved by stirring, slowly evaporated to dryness under stirring at 70°C, dried at 120°C for 10 hours, calcined at 720°C for 6 hours, and the catalyst was obtained after molding and sieving, which was designated as catalyst B. Butane hydrodehydrogenation, the results are shown in Table 1.

Embodiment 3

[0039] Weigh 3.75g Al(NO 3 ) 3 9H 2 O, 0.28g Cr(NO 3 ) 3 9H 2 O, 0.126g Fe(NO 3 ) 3 9H 2 O, 0.04g Co(NO 3 ) 2 ·6H 2 O, dissolve in 20ml deionized water, add 30ml 1.5molL dropwise under stirring -1 NH 3 solution, airtight at 60 ° C for 12 hours. Filtered and washed, then the precipitate was added to 1 g of 2.0wt% K 2 CO·solution, beating and mixing evenly, drying at 90°C for 12 hours, calcining at 700°C for 20 hours, forming and sieving to obtain the catalyst, which is designated as Catalyst C. Butane hydrodehydrogenation, the results are shown in Table 1.

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Abstract

The present invention discloses a low-carbon alkane dehydrogenation process, which is performed under a hydrogen present condition, and uses a bifunctional catalyst capable of catalyzing a dehydrogenation reaction and a methanation reaction between deposited carbon and H2, wherein the bifunctional catalyst contains Cr2O3, K2O, one or a plurality of elemental M selected from Fe, Co, Ni and Cu, and Al2O3. According to the present invention, with the method, the dynamic balance between the carbon generation and the carbon digestion in the low-carbon alkane dehydrogenation process can be achieved so as to substantially improve the single-pass life of the catalyst.

Description

technical field [0001] The invention relates to a process for dehydrogenating low-carbon alkanes, in particular to a process for producing propylene by dehydrogenating propane and producing butene by dehydrogenating butane. Background technique [0002] In recent years, with the rapid development of the global petrochemical industry, the demand for low-carbon olefins is also increasing. The dehydrogenation technology of low-carbon alkanes is an effective way to increase the production of C3-C4 olefins. [0003] The catalytic dehydrogenation reaction of light alkanes is limited by thermodynamic equilibrium, and must be carried out under harsh conditions of high temperature and low pressure. Excessively high temperature will intensify the cracking reaction and deep dehydrogenation of alkane, and reduce the selectivity; at the same time, it will accelerate the surface carbon of the catalyst and make the catalyst deactivate rapidly. [0004] At present, foreign companies have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C5/333C07C11/06C07C11/08B01J23/86
CPCB01J23/864B01J23/868C07C5/3332C07C2523/86C07C11/06C07C11/08Y02P20/52
Inventor 周金波邹国军李长明王栋苟文甲程中克郭珺李博唐迎春马艳捷
Owner PETROCHINA CO LTD
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