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Integrated catalytic process for converting alkanes to alkenes and catalysts useful for same

A technology for catalysts and dehydrogenation catalysts, applied in the directions of carbon compound catalysts, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc.

Inactive Publication Date: 2008-04-23
ROHM & HAAS CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the concomitant formation of combustion products increases the amount of undesired by-products without any contribution to the amount of desired olefinic products

Method used

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  • Integrated catalytic process for converting alkanes to alkenes and catalysts useful for same
  • Integrated catalytic process for converting alkanes to alkenes and catalysts useful for same
  • Integrated catalytic process for converting alkanes to alkenes and catalysts useful for same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0046] The method of the present invention includes sequential thermally combined reactions, each reaction will have a specific C 2 -C 4 Conversion of alkanes to their corresponding C 2 -C 4 Olefin. This method makes the corresponding C 2 -C 4 The total yield of olefins and the total thermal efficiency are higher than the results obtained by either reaction alone. The method and the catalyst suitable for the method will be described in general below. Then, an exemplary embodiment of the present invention will be described in more detail. The method of the present invention is a combination of an oxidative dehydrogenation reaction for converting propane to propylene and an endothermic dehydrogenation reaction. Although exemplary embodiments will be described in detail below, those of ordinary skill in the art can appreciate and understand that according to the ordinary skills and general knowledge of those skilled in the art, the present invention can be used for other types of rea...

Embodiment 1

[0082] Put 2ml (ml) of the V / Nb / Si / Ox oxidative dehydrogenation catalyst prepared by the above method in the exothermic reaction zone, and use 2ml of the V / Cr / Ag / Si / Ox endothermic dehydrogenation catalyst for the endothermic reaction Area. Each catalyst was independently tested under the conditions of 625°C and a residence time of 0.4 seconds. The catalyst V / Nb / Si / Ox in the first zone was evaluated with feed A, and the catalyst V / Cr / Ag / Si / Ox in the second zone was tested with feed B. The mixing test (ie including both catalysts at the same time) was carried out with feed A. The results of these tests are shown in Table 1. As shown in the table, the cumulative yield of the mixed method is higher than the yield of any reaction zone when operating alone.

[0083] Table 1: 625°C, residence time 0.4 seconds, using feed A

[0084] Reaction zone

Catalyst

T℃

C％

S％

Y％

ODH

V / Nb *

625

30.3

55.8

16.9

...

Embodiment 2

[0090] The second test was carried out using the same amount of the same catalyst as in Example 1, but with a residence time of 0.6 seconds. The results are listed in Table 2 below. As shown in the table, the cumulative yield of the mixed method is higher than the yield of any reaction zone when operating alone.

[0091] Table 2: 522°C, residence time 0.6 seconds, using feed A

[0092] Reaction zone

Catalyst

T℃

C％

S％

Y％

ODH

V / Nb * +

577

47.3

56.8

27.0

Endothermic

V / Cr / Ag **

582

25.9

92.7

24.0

Hybrid-both

V / Nb and / Cr / Ag

522

36.7

83.9

31.0

[0093] Temperature=T°C; Propane conversion rate=C%; Selectivity to propylene=S%; Propylene yield=Y%

[0094] * Independently with feed A

[0095] ** Independently with feed B

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Abstract

The present invention relates to an integrated multi-zone process for the conversion of alkanes to their corresponding alkenes comprising the exothermic conversion of a portion of the alkanes by oxidative dehydrogenation in an exothermic reaction zone in the presence of oxygen and a suitable catalyst to its corresponding alkenes, the product of said exothermic reaction zone is then passed to an endothermic reactor in which at least a portion of the remaining unconverted alkanes are absorbed in the presence of carbon dioxide and other suitable catalysts Thermal dehydrogenation.

Description

[0001] Government rights [0002] The present invention was made in accordance with the document No. DE-FC36-04G014272 issued by the US Department of Energy with the support of the US government. The U.S. government has certain rights in this invention. Technical field [0003] The present invention relates to a method for catalytically converting alkanes to their corresponding olefins, and a catalyst suitable for the method. Background technique [0004] The well-known industrial method for producing monomers such as unsaturated carboxylic acids and unsaturated nitriles usually uses one or more olefins as raw materials and converts them into the desired monomer products through catalytic gas phase oxidation. Due to the pressure of industrial competition and the price difference between alkanes and corresponding alkenes (such as propane and propylene), people are working hard to develop some methods that use alkanes as raw materials to finally produce the required monomers at a lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/02C07C5/333
CPCC07C2523/68C07C5/3332C07C2523/22C07C2523/20Y02P20/52C07C5/48C07C2523/26B01J37/10B01J23/002B01J23/20B01J23/685B01J37/0201B01J37/0203B01J2523/00B01J35/19B01J35/56B01J35/617B01J35/635B01J35/647C07C11/06C07C11/02B01J2523/18B01J2523/41B01J2523/55B01J2523/67B01J2523/56C07C5/02C07C5/03C07C5/00
Inventor A·本德里W·鲁廷格
Owner ROHM & HAAS CO
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