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Process and device for preparing propylene by dehydrogenating propane or propane-enriched light hydrocarbon

A technology for low-carbon hydrocarbons and propane, which is applied in the field of dehydrogenation of low-carbon alkanes, can solve the problems of undeveloped and protected heat-carrying functions, unfavorable catalysts, etc. Effect

Inactive Publication Date: 2017-01-25
SHAOXING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the heat-carrying function of large and small particles has not been developed, and large and small particles share a regenerator, which is not conducive to the protection of catalyst activity.

Method used

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  • Process and device for preparing propylene by dehydrogenating propane or propane-enriched light hydrocarbon
  • Process and device for preparing propylene by dehydrogenating propane or propane-enriched light hydrocarbon

Examples

Experimental program
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Effect test

Embodiment 1

[0050] Such as figure 1 As shown, a propane or propane-rich low-carbon hydrocarbon dehydrogenation propylene device of the present invention includes a riser reaction system, a catalyst circulation regeneration system, and a heat carrier circulation system, wherein:

[0051] The riser reaction system includes a riser reactor 01, the lower part of the riser reactor 01 is the raw material inlet, and the upper part of the riser reactor 01 is the catalyst inlet, and the riser reactor 01 is sequentially arranged into several reaction sections from bottom to top. Each reaction section is correspondingly provided with a heat transfer pipe for supplementing heat for the reaction; the reaction settler 02 is arranged above the riser reactor 01, and the reaction settler 02 is provided with an oil-gas cyclone separator 10;

[0052] The catalyst circulation regeneration system includes the first regenerator 06 for catalyst regeneration. One end of the first regenerator 06 is the input end ...

Embodiment 2

[0065] The process equipment is the same as in Example 1, except that the catalyst, heat carrier and process parameters are as shown in Table 2.

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Abstract

The invention discloses a process and a device for preparing propylene by dehydrogenating propane or propane-enriched light hydrocarbon. The device comprises a lifting pipe reaction system, a catalyst cyclic regeneration system and a heat carrier circulation system, wherein after propane is subjected to upward reaction in a lifting pipe for a period of time, the temperature of the lifting pipe is lowered and the dehydrogenation reaction speed is reduced; at the moment, a high-temperature small-particle heat carrier enters a low-temperature part in the lifting pipe to increase the temperature of oil gas and a catalyst so as to enable the dehydrogenation reaction to be conducted continuously; the heat carrier supplements heat for the lifting pipe for 2 to 6 times in the way, so that the dehydrogenation reaction is close to an equilibrium conversion rate; the heat carrier separated by a cyclone separator enters a second regenerator and contacts with high-temperature flue gas generated by dry gas combustion, so that the high-temperature heat carrier is obtained again and is circulated to each part of the lifting pipe; a large-particle microsphere catalyst which enters from the upper part of the lifting pipe settles down the lower part of the lifting pipe by virtue of gravity to be discharged and is lifted and conveyed to a first regenerator, and then the catalyst is regenerated under the conditions of low temperature, low oxygen and the like and is circulated and fed into the inlet of the upper part of the lifting pipe, so that catalyst circulation is realized.

Description

[0001] Technical field: [0002] The invention relates to a process for dehydrogenating low-carbon alkanes, more particularly to a process for producing propylene from dehydrogenation of propane or low-carbon hydrocarbons rich in propane and its device. [0003] Background technique: [0004] The process of propane catalytic dehydrogenation to propylene has the characteristics of high yield and the hydrogen obtained from dehydrogenation is a high value-added product. It is currently the main method for producing propylene. There are many methods for preparing propylene from propane catalytic dehydrogenation disclosed in the prior art, such as CN100460371C discloses a device for preparing propylene from propane dehydrogenation under hydrogen plasma conditions. In the state of laboratory experiments, it is difficult to implement on an industrial scale. USP4418237, USP4435607, USP4788371, USP4886928, CN1179930C, etc. disclose a method for dehydrogenating hydrocarbon raw materials...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C5/333C07C11/06
CPCY02P20/584C07C5/3335C07C5/3337C07C11/06
Inventor 季根忠章思怡吴立李俊
Owner SHAOXING UNIVERSITY
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