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A method for direct conversion of synthesis gas to aromatics and co-production of methane

A technology for synthesis gas and methane, which is applied in chemical instruments and methods, hydrocarbon production from carbon oxides, and condensation hydrocarbon production with dehydrogenated hydrocarbons, etc., can solve the problems of reduced conversion rate, low reaction pressure, high temperature, etc. Achieve the effects of high methanation conversion rate, lower reaction temperature, and high heating efficiency

Active Publication Date: 2018-08-10
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] As shown in the above formula, the oxygen-free aromatization of methane is an endothermic reaction, so as the temperature increases, it is favorable for C 6 h 6 formation, but increasing the pressure will make CH 4 The conversion rate is reduced, so the reaction requires higher temperature and lower reaction pressure

Method used

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  • A method for direct conversion of synthesis gas to aromatics and co-production of methane
  • A method for direct conversion of synthesis gas to aromatics and co-production of methane
  • A method for direct conversion of synthesis gas to aromatics and co-production of methane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Catalyst of the present invention can be prepared as follows:

[0057] 1)(Ni,Mo) / SiO 2 Two-step impregnation preparation of the existing isometric impregnation method for bimetallic precursor catalysts:

[0058] SiO 2 Treated in air at 200°C for 2h, then treated with Ni(NO 3 ) 2 ·6H 2 O is impregnated with an equal volume of Ni source, the active metal Ni loading is 10wt%, vacuum treatment for 1h, drying at 120°C for 12h, and calcination at 550°C for 2h to obtain Ni / SiO 2 Granular catalyst; as (NH 4 )6Mo 7 o 24 4H 2 O is impregnated with an equal volume of Mo source, the active metal Mo loading is 10wt%, vacuum treatment for 1h, drying at 120°C for 12h, and calcination at 550°C for 2h to obtain (Ni,Mo) / SiO 2 granular catalyst.

[0059] 2) Tetrapropylammonium hydroxide (TPAOH) was used as template, and Al(NO 3 ) 3 9H 2 O is the source of Al, with (Ni,Mo) / SiO 2 The Si dissolved out during the synthesis was used as the Si source; the Al(NO 3 ) 3 9H 2 O is ...

Embodiment 2

[0068] Repeat Example 1, the catalyst preparation method and reaction conditions are the same as in Example 1, except that the reaction space velocity becomes 3000ml / g.cat.h, and the reaction results are shown in Table 2 below.

[0069] Table 2

[0070]

[0071]

[0072] The data in Table 2 show that the smaller the space velocity, the less heat released by methanation, so that the anaerobic aromatization of methane is not sufficient, so the selectivity of aromatics is not high.

Embodiment 3

[0074] Repeat Example 1, the catalyst preparation method and reaction conditions are the same as in Example 1, except that the reaction space velocity becomes 10000ml / g.cat.h, and the reaction results are shown in Table 3 below.

[0075] table 3

[0076]

[0077] The data in Table 3 show that the larger the space velocity, the heat released by methanation is sufficient, but the faster gas velocity makes the anaerobic aromatization of methane insufficient, and the excess gas will take away a lot of heat, so the aromatics Not very selective.

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Abstract

The invention discloses a method for coproduction of aromatic hydrocarbon and methane by direct conversion of synthesis gas. The method includes: putting a catalyst in a reactor, feeding the synthesis gas for reaction, performing coupled reaction of methanation and methane non-oxidative aromatization to realize coupling of reagents, products and heat of a reaction system, and performing further preparation at 200-500 DEG C to directly obtain aromatic hydrocarbon. By series connection of the methanation reaction and the methane non-oxidative aromatization reaction, heat coupling of the two reactions is realized effectively, carbon deposit is effectively inhibited by effective combination of two active centers, the synthesis gas is directly converted into the aromatic hydrocarbon at a low temperature, and economic benefits are increased substantially. By reaction within 120min, aromatic hydrocarbon selectivity can be stabilized at 15-30%, and after the reaction time reaches 1000h, the conversion rate keeps stable, and the catalyst is still active.

Description

technical field [0001] The invention relates to a method for producing aromatics by direct conversion of synthesis gas, in particular to a method for directly converting methane to produce aromatics by simultaneously carrying out methanation and methane oxygen-free aromatization. Background technique [0002] Under the background of the world's oil resource shortage and energy crisis becoming more and more prominent, carbon-one chemistry (C1 chemistry) has been extensively studied and developed rapidly. The carbon chain growth process of synthesizing and preparing organic compounds containing two or more carbon atoms from compounds with only one carbon atom (such as CO, methane, methanol, hydrocyanic acid, etc.) is called carbon-one chemistry. Carbon-chemical raw materials have a wide range of sources, which can reduce the excessive dependence on petroleum resources. It is the most important and promising way to replace petroleum synthesis routes to prepare basic organic che...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C1/04C07C9/04C07C2/76C07C15/04C07C15/06B01J29/48B01J29/78B01J29/46B01J23/755
CPCY02P20/52
Inventor 张燚邵明泉刘意
Owner BEIJING UNIV OF CHEM TECH
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