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Low carbon alkane aromatization method

一种低碳烷烃、芳构化的技术，应用在化学仪器和方法、碳氢化合物、碳氢化合物等方向，能够解决催化剂机械强度差、无法在工业上获得应用等问题

Active Publication Date: 2020-07-07
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst has poor mechanical strength and cannot be applied industrially

Method used

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  • Low carbon alkane aromatization method
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Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0057] ZSM-5 powder was mixed with 0.05% by weight of Pt(NO 3 ) 2 aqueous solution mixed. The mixture was impregnated at room temperature for 1 hour, then heated to 80° C. in a rotary evaporator to obtain a dry product, followed by calcination at 300° C. for 3 hours. The resulting calcined product and Al 2 o 3 Mix according to 70:30 and extrude, bake at 550°C for 2 hours. The catalyst, denoted Catalyst A, contained 500 ppm Pt.

[0058] It can be seen from the elemental mapping image that 90% of Pt is distributed on the zeolite, and the ratio of this percentage to the percentage of zeolite in the carrier is 90% / 70%=1.29.

preparation example 2

[0065] Combine ZSM-5 powder with Al 2 o 3 Mixed and extruded at a mass ratio of 70:30, then calcined at 550°C for 2 hours, and the resulting calcined product was treated with 0.05% by weight of Pt(NO 3 ) 2 The aqueous solution was subjected to ion exchange (the volume ratio of the product to the solution amount was 1:5), stirred at a temperature of 35° C. for 2 hours, and then separated into solid and liquid. The resulting product was washed with water to remove the physical adsorption on ZSM-5 and Al 2 o 3 Pt on 2+ . Finally, the ion-exchanged product was dried overnight (8 hours) at 90°C in air, followed by calcination at 550°C for 3 hours to obtain a catalyst. The catalyst, denoted Catalyst D, contained 500 ppm Pt.

[0066] It can be seen from the elemental mapping image that 85% of Pt is distributed on the molecular sieve formed by zeolite, and the ratio of this percentage to the percentage of zeolite in the carrier is 85% / 70%=1.21.

preparation example 3

[0071] Mix ZSM-5 powder with colloidal silica and fumed silica at a mass ratio of 70:20:10, dry and shape it, then bake at 550°C for 2 hours, crush and sieve to obtain 20-40 mesh particles; after that The resulting particles were mixed with 0.05 wt% Pt(NO 3 ) 2 The aqueous solution was mixed, and the resulting mixture was impregnated at room temperature for 1 hour, then heated to 80° C. in a rotary evaporator to obtain a dry product, and calcined at 550° C. for 3 hours to obtain a catalyst. The catalyst, denoted Catalyst F, contained 500 ppm Pt.

[0072] It can be seen from the elemental mapping image that 85% of Pt is distributed on the zeolite, and the ratio of this percentage to the percentage of zeolite in the carrier is 85% / 70%=1.21.

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Abstract

The invention relates to the field of production of aromatic hydrocarbons from low-carbon alkanes, and discloses a low-carbon alkane aromatization method. The method comprises the following steps: inthe presence of an aromatization catalyst, subjecting low carbon alkane to dehydroaromatization reaction, the aromatization catalyst comprising a support and a metal active component supported on thesupport, the metal active component comprising platinum, the support comprising a zeolite and a binder, and at least 80% of the metal active component being distributed on the zeolite. The method provided by the invention can improve the yield of the target product aromatic hydrocarbon, and the regenerated catalyst can still maintain high catalytic performance. In addition, the method disclosed bythe invention can simultaneously meet industrial application.

Description

technical field [0001] The invention relates to the field of producing aromatics from low-carbon alkanes, in particular to a method for aromatizing low-carbon alkanes. Background technique [0002] In the process of ethane dehydroaromatization, ethane can be selectively and directly converted into high-value BTX products in the presence of catalysts. Due to the low reactivity of ethane, the reaction temperature usually exceeds 600°C, which leads to serious coking of the catalyst. Therefore, from an economic point of view, the catalyst used in the dehydroaromatization reaction must be renewable. [0003] figure 1 The main process of dehydroaromatization of ethane over a metal-supported catalyst is shown: 1) ethane is activated at the metal site of the catalyst and converted to ethylene; 2) ethylene is activated at the acid site of the catalyst and converted to C6+ Hydrocarbons; 3) C6+ hydrocarbons are dehydrogenated on the metal sites to form aromatics. It can be seen tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C5/41C07C15/02C07C15/04B01J29/44B01J29/46
CPCC07C5/3337C07C2/24C07C5/417B01J29/44B01J29/46B01J2229/186B01J2229/42C07C2529/44C07C2529/46B01J2235/30C07C15/02C07C15/04C07C9/15C07C11/04B01J37/0009C07C2/76Y02P20/52Y02P20/584B01J35/396C07C15/06C07C15/08C07C2523/42B01J37/30
Inventor 王辉项益智约翰·松埠单军军程继红孙琦丽萨·阮
Owner CHNA ENERGY INVESTMENT CORP LTD
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